Product Description. Its something you just gotta work out yahself. Page created in 2.68 seconds with 39 queries. Our 8-tooth sprockets conform to international ISO, DIN, or American ANSI standards. //specify corresponding links below For the best experience on our site, be sure to turn on Javascript in your browser. The 8T will cut A LOT faster if you let the saw do the cutting and not force it and the saw has the power to pull the large rim. 1*Washer. Chainsaw Sprocket 3/8" pitch, 7 teeth Part #: 36-1619. OEM spur sprocket from Stihl. and that plenty and works well. NO E-MAILS OR TEXTS. OEM Replacement This part is aftermarket equipment designed to replace the original manufacturer's part numbers specified here. These are good quality sprockets. I just put an 8 pin 3/8" on the Hutzl 360 I just built and it cuts fast. I'm just curious what others use. I run 7 on all my firewood saws, even the big ones. Free shipping. imagelinks[2]="https://woodmizer.com/us/Sawmill-Blades?utm_source=forestryforum.com&utm_medium=banner&utm_campaign=sawmillblades&utm_term=2022-05-01&utm_content=800x160" At some point, depending on the horsepower of the chainsaws powerhead, it may no longer be able to rotate a heavy chain around a very long bar efficiently or at all. Stihl - Aftermarket Chainsaw Sprockets - RIM SPROCKETS. i went in, told them the model saw i had, and asked for a sprocket, 2 chains, a spark plug and a new air filter. This rim also has wear depth indicators which tell you when to replace your rim. However unlike the acceleration vs. top speed equation you get with a car, in a chainsaw it's mostly a question of balancing the load on the chain with the engine output at full throttle. We have the CHAINSAW SPROCKETS - RIM SPROCKETS You need with fast shipping and low prices. Rim sprockets float on the splined hub of the drum and move side to side, allowing the chain and rim to align with the bar as the chain travels around the bar's groove. myimages[6]="../../../images/top-banner/EZ-junior.jpg" 10, Mo is bedder! When changing to an 8 tooth sprocket, set the saws oiler flow rate to max. */ 10% OFF. ADA Compliance Policy Sprocket size is shown: chain pitch by the number of teeth. Extend operational life by maximizing chain and bar groove alignment. STIHL Rim Sprocket, Specifications: 0.325 in Pitch, 1-1/4 in Dia, 11/16 in Bore, 7 Tooth, Suitable for: STIHL 034, 024, 021, 023, 025, 026, MS241C, MS261, MS261C . If it were mine Id want a 7 pin on that saw. 8 pin is rarely faster at the end of the day or a week of work (When you figure in all of the "stallouts"), and is a lot harder on your clutch and saw overall. 30 day guarantee on all items, Safe Payments ry=1 Thanks for the replies. Only registered users can write reviews. You are using an out of date browser. Philbert P.S. A faster chain requires more lubrication. Fewer cutters allow for more efficient chip removal but cut slower. Passez la souris pour agrandir. Spur sprockets do not come with bearings, and we recommend replacing the bearing for every 2 spur sprocket replacements. Gearing is essentially slowing down or speeding up your chainsaws chain in order to increase cutting power or speed. . Most of the time I opt for overkill on the saw. Sign up for newsletter today. 12-13 years, actually. Bailey's is committed to keeping our site compliant with the American with Disabilities Act. Two-piece design includes a drum with a replaceable rim, allowing rim to be replaced multiple times before the entire unit is replaced. })(); BTU possessor Hearthstone Mansfield Husqvarna 346xp Stihl MS 440 . Clutch Drum Chain Sprocket .404 7 Tooth For Stihl 075 076 050 051 Chainsaw 1111 640 2002. .cardIcon-icon[data-test="credit-card-icon-diners-club"] { display:none !important;} The marriage of an axe and a pickaroon whose Husqvarna Gas Chainsaw Power-to-Weight Ratio and Min/Max Bar Lengths. Honestly I wouldn't have an 8 pin on a 3/8 20" 60cc saw unless I was cutting 10" and down in hardwood. Good thing as it keeps us supplied with good firewood that we cut with the saws and split with a tractor attachment. Bailey's is committed to keeping our site compliant with the American with Disabilities Act. For tree riding (slow speed crawling lots of throttle on off) I found the old pros best gearing choice was 19/43 in chaincase. The 8 pin will give you about 15% more chain speed and 15% less torque. That saw has an impressive amount of torque. 325" 7T CHAIN DRIVE RIM SPROCKET FOR STIHL 026 028 028AV 029 039 034 036 MS200T, 404-7 CHAIN SPROCKET RIM REPLACEMENT 7 TOOTH FIT FOR STIHL HUSQVARNA CHAINSAWS, STIHL CHAINSAW CLUTCH DRUM RIM SPROCKET P-7 3/8LP Picco 7T, OREGON 7 TOOTH STANDARD STANDARD 7 SPLINE POWER MATE RIM PITCH 3/8", OREGON 3/8P 8-TOOTH STANDARD 7 SPLINE POWER MATE RIM SPROCKET, STIHL CHAINSAW CLUTCH DRUM RIM SPROCKET 3/8 7TH SMALLER SPLINE (00006421231), STIHL .325-8TH CHAINSAW CLUTCH DRUM RIM SPROCKET. The teeth of the chain sprocket press against the drive link tanks and the saw chain starts to rotate. The gearing on my Axys sks 155 feels really good with stock gearing and 7 tooth drivers. My brother has an 029 as well but his has the 3/8 chain on it. Highly matched to the original device. ProPart 7-Tooth 7T 3/8" Sprocket for Stihl 030AV 031AV 031AVE 032AV 040 041 041AV 041AVE Chainsaw Brand: ProPart 8 ratings $2099 Get Fast, Free Shipping with Amazon Prime FREE Returns High Quality Aftermarket Part Made to Meet or Exceed OEM Specifications Aftermarket Stihl Replacement Chain Sprocket 3/8" Pitch 7 Tooth Ships From The U.S.A. Chain speed had not seemed an issue with the 7, but I am not a professional or anything either. Feature 2-Stroke. The big Homelite in my avatar only came with an 8 tooth .404 .One of my 125 Macs runs an 8 and one a 7 .The Husqvana 2100 runs an 8 tooth .375 on a 32" bar but it's 99 cc too . For a better experience, please enable JavaScript in your browser before proceeding. We also accept e-transfers. myimages2[1]="../../../images/top-banner/behindtheforum.jpg" ivel played around with a 8 on the 440 and even a 9 on the 066 but i find when cutting wood to bar tip with each saw that they feel best with a 7. the 026 wears a 18 440 a 28 and 066 a 32. these all reguarly cut wood past theyre tip. PN: Replaces Oem 1121 Model Fit: Stihl 024 026 Ms 260 Designed To Fit Original Stihl Clutch Drum (1121 160 2900 Or 1121 160 2910) Condition: New Notes Helpful Hints: This Rim Sprocket Is Designed To Fit The Stihl Oem Clutch Drum Will Not Fit Aftermarket Drums function random_imglink2(){ The chain-driving portion of the sprocket, and the clutch cup, are a single component and are all replaced together when a new spur sprocket is installed. Product Description. $29.99 It is our goal to develop a website that is accessible to everyone! Free shipping for many products! Updated: 00/04/25 What's the advantage of each? BrandName Adefol. Replace OREGON For 18720, Replace Stihl For 0006421249. To increase the speed of the chain, increase the drive sprockets diameter. You can have as many as you wish 7 pin on everything. Increasing the diameter/speed of the drive sprocket will reduce its applied power. Fits Stihl model 029, 034, 034 Super, 036, 039, MS 290, MS 310, MS 360, MS 360 C, MS 360 Pro, MS 360 QS, MS 390 Chainsaws. 8 pin for bore cutting is too fast! document.write('') Hardening process Register today and take advantage of membership benefits. Livraison gratuite. Car & Truck Safety & Security Accessories, item 1 Stihl OEM Spur Sprocket .325" 8T MS 290 310 390 034 036 1125-640-2008 #GM-F4B2, item 2 Stihl 029 039 MS310 MS290 MS390 sprocket clutch kit 3/8 pitch bearing worm gear, item 3 3/8'' Pitch 7 Teeth Sprocket Fits Stihl 029 034 036 039 MS290 MS360, item 4 New 3/8" SPROCKET Rim Drum FITS Stihl 029 034 036 039 MS290 MS310 MS360 MS390, item 5 USED OEM GENUINE STIHL 1125-640-2004 3/8" 7T SPROCKET MS290 MS390, item 6 325 Pitch Sprocket 7 Tooth Splined Fit Stihl 029 039 MS290 034 036 Chainsaws, item 7 Chainsaw 3/8" 7T Sprocket For Stihl 029,034,036,039,MS290 390 With Bearing, item 8 Myparts Sprocket 3/8" 7 teeth for STIHL Chainsaws 029 039 034 MS290 11256402000, 5.0 out of 5 stars based on 3 product ratings. You'll need a 3/8 7tooth mini spline rim sprocket & part# 3003 000 8913 is the 16" 3/8 stihl bar. JavaScript seems to be disabled in your browser. You can have as many as you wish Chain drive link count yes. Most of the saw mechanics are under paid, and for the most part know little about the equipment they work on. Stihl used to offer an 18" 3003-mount Picco bar, but those seem to be hens' teeth now. Oregon Power Mate 32137 clutch rim sprocket drum 3/8 pitch 7-teeth fits Stihl 038 chainsaw. Best answer to this is take the huge plunge (scary & expensive I know) and make the big decision to spend $3-5 on an 8pin rim sprocket. (function () { This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. 5Pcs Sprocket Rim 3/8 inch Pitch 7 Tooth 19mm for Stihl MS360 MS310 Husqvarna 15425450 5155 Chainsaw 18720 Replacement Parts. it looks like this: i do appreciate the insight on the 7 vs 8 tooth count. Drive sprocket is 3/85" pitch with 7 teeth. . See all. For orders over $75, Free Exchanges Fewer cutters allow for more efficient chip removal but cut slower. Item: .325 Pitch X 7 Or 3/8 X 7 Tooth Rim Sprocket Select In Options Drop Down Box.Mini Spline. You guys have got me thinking. Thank you for making it available. $14.99 Shipping Weight 1.0 lbs. .cardIcon-icon[data-test="credit-card-icon-american-express"] { display:none !important;} . Share: >. 7 pin. Granberg Alaskan Sawmills, Parts & Accessories, Skip to the beginning of the images gallery. You must log in or register to reply here. .cardIcon-icon[data-test="credit-card-icon-maestro"] { display:none !important;} The smaller diameter decreases the outer speed of the sprocket increasing the applied power on the chain. If you replace the components that. IT saved belts and made my sled really respond the way I like. STIHL CHAINSAW CLUTCH DRUM RIM SPROCKET 3/8 7TH SMALLER SPLINE (00006421231), 404-7 CHAIN SPROCKET RIM REPLACEMENT 7 TOOTH FIT FOR STIHL HUSQVARNA CHAINSAWS, STIHL CHAINSAW CLUTCH DRUM RIM SPROCKET P-7 3/8LP Picco 7T, OREGON POWER MATE RIM SPROCKET(.325" X 8 TOOTH) SMALL SPLINE, 325" 7T CHAIN DRIVE RIM SPROCKET FOR STIHL 026 028 028AV 029 039 034 036 MS200T, OREGON 3/8P 8-TOOTH STANDARD 7 SPLINE POWER MATE RIM SPROCKET, OREGON 7 TOOTH STANDARD STANDARD 7 SPLINE POWER MATE RIM PITCH 3/8", .325-7 TOOTH SMALL RIM SPROCKET REPLACEMENT FITS STIHL 028 029 034 039 MS290 MS310 MS390 SAW. with the 7 it doesnt seem to matter. 12 % DE REDUCTION SUPPLEMENTAIRE AVEC NM1638JK11OFF95 (-200 maximum) Afficher tous les objets admissibles et les conditions. If you cut lots of hardwood, like oak and maple, or need to use a longer bar, then increased torque is what you need. An 8pin .404 is bigger than a 9pin .325 for example. You may not be all that happy with the 7 tooth when you had 8 before. For the best experience on our site, be sure to turn on Javascript in your browser. xmlHttp.send('{"store_id":"1001795454","timezone_offset":"-8","timestamp":"2023-03-01T19:15:45.86776700Z","visit_id":"e09e7569-7c81-40a9-9da4-db4d6a3bf31e","channel_id":1}'); Changing a chainsaw's drive sprocket's tooth count is often called "gearing". You are using an out of date browser. Do I need one? See products .404" Harvester 18HX and 19HX Chain The Pro Spur is made from quality heat treated steel and is popular for small professional chainsaws. 026 rim sprocket and bar swap with 036 pro. I run 7 on all my firewood saws, even the big ones. More of an art than a science, gearing essentially changes the drive sprocket diameter by adding or removing teeth. 325" 8T. Unless you run a 12" bar run a 7 pin. 0 Members and 1 Guest are viewing this topic. STIHL Chain Sprocket, Specifications: 3/8 in Pitch, 7 Teeth, Suitable for: STIHL MS261, MS261C, MS271, MS271C, MS291, MS291C Chainsaws For a better experience, please enable JavaScript in your browser before proceeding. Note: The real color of the item may be slightly different from the pictures . 7 Teeth. I have an MS270 that is about 7 years old. It has cut up a "few" large trees over the years. Replace for 0000 642 1206, For Oregon 22270, 0000 642 1207. Over 200+ free JavaScripts here! Clutch Chain Sprocket Rim 325-7 7 Tooth Replacement for Stihl Husqvarna Chainsaw. Unless you have very specific cutting needs, it is best to stick with the drive sprocket tooth count that came on your saw from the factory. if (ry==0) on Chainsaws. my old, well-used Stihl chainsaw. Changing your chainsaw's gearing will change the cutting characteristics of your saw. Why does my Stihl 029 Super list both a 7 tooth and 8 tooth sprocket for .325 pitch? ry=1 325" 7 Tooth Clutch Drum Chain Sprocket Rim Cage Bearing Kit For Stihl Ms250 Ms230 Ms210 025 023 021 Chainsaw Parts. We carry all top brands. Generally, one step up in tooth count (6 to a 7) or (7 to 8). Feature Other. Many professionals use these two combinations on their chainsaws to maintain consistent gearing between them. Register today and take advantage of membership benefits. OREGON 3/8P 8-TOOTH STANDARD 7 SPLINE POWER MATE RIM SPROCKET $10.50 Add to Cart 3/8 7TH SMALL SPLINE RIM SPROCKET $10.50 Add to Cart STIHL 7T CLUTCH DRUM RIM SPROCKET 3/8" $11.99 Add to Cart 325" 7T CHAIN DRIVE RIM SPROCKET FOR STIHL 026 028 028AV 029 039 034 036 MS200T $11.99 Add to Cart imagelinks[4]="http://www.ezboardwalk.com/" Lubrication is important. If you live out west and/or cut a lot of softwood like pine then speed is what youre after. myimages[2]="../../../images/top-banner/BladesFreeShip.jpg" Changing the number of teeth on your chainsaws drive sprocket to optimize performance is called gearing. $20.25. Chainsaw Safety Pants, Shirts, Gloves & Glasses. The mountain pine beetle epidemic required fast learning in the art of tree felling and subsequent forestry practices to direct the forest's regrowth. imagelinks[3]="https://woodmizer.com/Store/Shop/Portable-Sawmills/LX25-Portable-Sawmill?utm_source=forestryforum.com&utm_medium=banner&utm_campaign=lx25&utm_term=2023-02-10&utm_content=800x160" Consumer Spur Sprocket Part Number: 106657X Specs Equipment Type Chainsaw Pitch .325" Teeth 7 Crank Diameter .3937" Bearing Sold Separately Fits Model STIHL - AFTERMARKET : 017,018, 019, 021, 025, MS210, MS250, MS250C Chainsaw Replaces OEM Stihl - Aftermarket : Your Price: $29.40 Qty: Add to Cart More Info Consumer Spur Sprocket Part Number: 28016X - Welcome to A.S.! var imagelinks=new Array() Teeth: 7 Pitch: 3/8" Equipment Type: Chainsaw: Fits Model: STIHL - AFTERMARKET : 017, 018, 019, 021, 023, 025, MS210, MS250, MS250C Chainsaw : Herr 193-A7, Stens 085-269 Amateur question about Stihl ms261 C-M and Light 04 bar compatibility specs, 026 rim sprocket and bar swap with 036 pro. Finding the sweet spot will take some trial and error, so it is always a good idea to talk with a professional in your area to see what they recommend. Baileys has it part#0rf 34162x 16 bucks. I have a 029S Farm Boss with a .325, 18inch bar. I've been running an 8 tooth and it does tend to bog in hardwoods a bit. Find many great new & used options and get the best deals for Stihl sprocket 1118 640 2001 8 mm, 0.325'', 7 teeth original new! $34.99 $26.95 Feature SingleCylinder. I prefer 8t if the saw has the power for it. Cylinder Assemblies 152. or requests on how to improve this sites accessibilty for all users. In stock. A pitch eight tooth sprocket has a very similar diameter to a .404 pitch 7 tooth sprocket. The chain driving portion of the sprocket and the clutch cup are fused together, so when it wears out, you need to replace the whole component. It is our goal to develop a website that is accessible to everyone! Here For The Long Haul! (Or my home either), I'm agreeing with everyone else about using a 7. 4+ cords stored on a 1/7 acre suburban lot. I am thinking new needle bearings may be in order. 6Pc Sprocket Rim 3/8" .325" .404"-7T/8T Kit For Husqvarna Stihl 2-Stroke Chainsaws . Certification Other. You know when you have an idea that looks good on paper, but in reality, it is far less effective than you thought it would be? 5.0 out of 5 stars based on 17 product ratings, 4.9 out of 5 stars based on 98 product ratings, 4.6 out of 5 stars based on 42 product ratings, 5.0 out of 5 stars based on 4 product ratings, 5.0 out of 5 stars based on 20 product ratings, 4.9 out of 5 stars based on 35 product ratings, 5.0 out of 5 stars based on 2 product ratings. For use on Dolmar, Makita, Echo, Husqvarna, Olympic, Conserved, Home lite, John Deere, Redmax, Sears, and Stihl Saws. For example, 3/8 x 7 references a sprocket that is 3/8 pitch with 7 teeth. Bailey's is NOT an authorized STIHL Dealer.OEM parts are new. 5,36 EUR. We welcome any feedback It is manufactured using high-quality materials, to the same specifications as the original part. If you want to stay with a 7 tooth sprocket, check with an Oregon dealer to see if they have one that would fit. not a rim type spocket. run a 8 pin on my 650 with the 25" or 28" bar & it doesn't seem to care lol 9 pin with 18" (avatar pic) bar just for grins. Feb 13, 2020. Increasing chain speed requires increased lubrication. US$ 0.45 US$ 0.50. It depends on what pitch your running, .325, 3/8 & .404 have different chain speeds in 7pin. Please note that modifying your chainsaw has risks and should only be done by experienced individuals. var xmlHttp = new XMLHttpRequest(); document.write('') My smaller saws are Husky 51 and 55 Rancher I wouldn't even think of an 8 tooth on them. Does not include bearing, must order Bearing # 37325 separately. Biggest advantage for the rim drive is the rim can be replaced when worn without replacing the entire clutch drum. Specs Equipment Type Chainsaw Pitch 3/8" Teeth 7 Crank Diameter .5" Type Rim Fits Model STIHL - AFTERMARKET : 017, 018, 019, 021, 023, 025, MS210, MS250, MS250C Chainsaw DOLMAR : 109, 110, 111, 115 Chainsaw RED MAX : G561AVS, G621AVS Chainsaw PARTNER : P400, P500, P545, P5000, P5100 Chainsaw MAKITA : DCS430, DCS520i, DCS4300 Chainsaw with the 9 its a hotrod with the 20" bar but definatly not a every day kinda combo. Purchasing a chainsaw can be difficult for the first-time buyer. Find many great new & used options and get the best deals for Oregon 32064X Spur Sprocket Kit Stihl 048 048AV 3/8" 7 Tooth 1117 640 2001 at the best online prices at eBay! Bundle 1. The sprocket on the tip are not like super worn as far as I can tell - there is some roundness to the points. Current slide {CURRENT_SLIDE} of {TOTAL_SLIDES}- Best Selling in Chainsaw Parts. myimages[5]="../../../images/top-banner/cookie-mizer.jpg" function random_imglink(){ Trusted SSL Protection, Amazing Selection But I bet it'll be fine. Join me as I recount my learnings and share what has worked for me. For heavy users who wear them out on a regular basis, this is a plus. Most of the saw mechanics are under paid, and for the most part know little about the equipment they work. Color: As Pictures Show. JavaScript is disabled. The 404 takes more HP to pull because it is wider. This can cause increased wear on the bar, chain, and clutch assembly. PowerType Petrol/Gas. Be careful who you learn or take advise from. For Stihl 034036039 MS290 MS310 MS360 B38. Think first gear on a bicycle. Stihl MS310 Stihl MS180 Dolmar 5100 Gooserider Mod Emeritus Hand Filing Chains - Switch to smaller diameter file as the chain tooth is getting narrower? on Sawmills and Milling, Started by uplander Not Fit 17mm. myimages[1]="../../../images/top-banner/ez50-banner.jpg" myimages[3]="../../../images/top-banner/LX25-FreeShipping.jpg" var myimages=new Array() About the only two modern saws I can think of that may benefit from 404 are the Stihl MS880 and Husky 3120. 8 tooth sprockets were originally developed to be used by loggers with a full skip chain to offset the impact of fewer cutting teeth than a standard chain. Preatty sure im running that magic 1/1 clutching. Product Details. . xmlHttp.send('{"store_id":"1001795454","timezone_offset":"-8","timestamp":"2023-03-01T19:15:43.42169300Z","visit_id":"e301ca96-e014-463f-b376-7f29a4e6438d","channel_id":1}'); As far as I know the MS290 in .325 comes with a 8 tooth nowadays and they seem fine with it. whatever. I'll stick with a 7t if it struggles to bury the bar. Some parts of this page is temporarily unavailable. ADA Compliance Policy Not enough torque and your engine will stall, too much and it will feel sluggish. 30 day guarantee on all items, Safe Payments Spur chain sprockets are durable, economical, simple to use, and very popular. the 66 is my work horse and screams through wood flooding chips like you wouldnt belive. Just try both 7- and 8-pin rims - what works best depend on a lot of factors. JavaScript is disabled. .cardIcon-icon[data-test="credit-card-icon-discover"] { display:none !important;} Package arrived in a timely fashion and was well packaged. Thank you for making it available. random_imglink2() Rim sprocket. Stihl MS 661 7 vs. 8 Tooth Sprocket - YouTube 0:00 / 3:00 Stihl MS 661 7 vs. 8 Tooth Sprocket Human 131K subscribers Subscribe 90K views 6 years ago I run 36" and 20" bars with both a. 10% OFF. CALLS ONLY -- ERIK 707 76two-324nine. Toggle signature. LOTS OF OTHER SPROCKETS AVAILABLE. Stove #1 - VC Encore 2550 catalytic - Burning almost 24/7 in LR as primary heater (and making LOTS of creosote! An 8pin .404 is bigger than a 9pin .325 for example. Yes, there is a 9 tooth sprocket, but it is used in very specialized situations and requires a special bar profile to decrease the risk of chain derailment. I'm not a heavy user, but I am in a situation with several (~8) acres between myself, my brother and parents, with plenty of hardwoods around so something is in need of cutting perdiodically (died from stress, wind/storm blew it over, lighting struck, old age). For A/R & A/P office admin inquires use walkerssaw@shaw.ca, 2023 Walker's Saw Shop LTD. So, the saw gets a good workout when it is needed. For best performance, replace every three rims. link to What is an Axearoon? Package Include: 1pc Rim Sprocket, Free Ground Shipping Standard splined rims have an inside sprocket bore of approximately 7/8". For A/R & A/P office admin inquires use walkerssaw@shaw.ca, 2023 Walker's Saw Shop LTD. Same thing with rim sprockets. It may not display this or other websites correctly. I run 7 on all my firewood saws, even the big ones. Free shipping for many products! Keep in mind that the entire cutting group needs to be taken into account when gearing your chainsaw. For the best experience on our site, be sure to turn on Javascript in your browser. Please. 7 TOOTH .404 AND 6 TOOTH 1/2 DRUMS. If you want to know more about finding the perfect product for you, including our expert's tips and tricks, read this article . Dont forget to adjust the oiler. Best Selling in Chainsaw Parts. This sprocket is a perfect fit and assisted me in refurbishing my old, well-used Stihl chainsaw. Tree cutting skills. 8 tooth-more chain speed but less torque and therefore more prone to bogging in hardwoods if you lean on it a little. Changing the drive sprocket tooth count on your chainsaw will change its performance characteristics. That includes a 7 pin rim so figure anouther 5 bucks if you want to try an 8. Is the rim sprocket better than the spur sprocket. WTH you can change one in about 5 minutes . Relatively new here, and have a question. Does oregon make rim and drum systems for that saw?