Question about RTO Spur Sprocket For Stihl 017, 021 Chainsaws

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I want to run a 3/8 pitch 0n my 028 do i need to

I want to run a 3/8 pitch 0n my 028 do i need to change the sprocket

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The following is copied from the Oregon FAQ "What is pitch".
Chain pitch is the distance between any three consecutive rivets divided by two. Pitch defines the size of the chain. OREGON® chain is made in several pitches - 1/4" is the smallest, 3/8" is the most popular. Other parts of the cutting elements are pitch-related. The drive sprocket must be the same pitch as the chain, and so must the nose sprocket in sprocket-nose bars.
An illustration and the original question is here: http://www.oregonchain.com/pro/service/faq.htm
If the result from an existing chain is 3/8"s or 0.375" then you need not replace the sprocket. If the result is different then the drive sprocket and bar nose if sprocketed must be changed. Chain gauge must also match to prevent problems.

If you have more questions or need additional help please reply below and I will get back to you. HTH & Good Luck.
Lou
Thank You for using FixYa.

Posted on Jun 03, 2010

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Are you sure the pitch of the chain is the same as the sprocket, ie if you are running a 3/8 pitch chain you need a 3/8 sprocket, if this is correct then you need to address your chain tention and sharpening.

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Depends on what lenght you want, as standard it runs a .325 pitch, 058 gauge chain, bar lenghts are available in 13,15,18,20", you can convert them to a 3/8 pitch chain by changing the the rim, or changing the complete sprocket and oil pump drive gear.

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I have husquavarna chain saw s/n 95212H01984 with sticker that says 41 Air Injection. Need to buy chain and/or chain bar. Need to know the model number for this serial number. Can you provide


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1 Answer

After new clutch sprocket &good bar &chain chain r bar moves prematuely and chain comes off bar nuts r tight


have you made sure that chain pitch and gauge are the same as the sprocket pitch pitches can be 3/8 lo pro 0.50 gauge

.325 x 0.50 gauge , .325 x 0.58 gauge

3/8 std x 0.50 or 3/8 x 0.58 gauge or 3/8 x 0.63 gauge

you could even have the correct drum but wrong rim sprocket on it

worst case is you could have mismatch bar and chain

make sure that bar adjjuster assy is working correctly

recheck chain / sprocket pitches and bar pitch and groove
gauge

be sure that you fitted chain to rim on sprocket correctly when you fitted bar and chain?

is the clutch cover pulling down tight ?

have a look and let me know if and what you find

cheers paul



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I need the specifications on a 1996 Kawasaki Ninja Zx6R Rear Wheel Chain. I need to buy a new one and don't know what size/specifications I need.


You need the pitch, roller width, roller thickness (All in all just the chain type) OEM is a 525, 108 link chain with a 15 tooth front sprocket and 40 tooth rear.
It is best to change sprockets and chain together. A stretched/worn chain will damage the sprockets which in turn will lead to premature wear on a new chain.
Best way to identify pitch(and chain type) is to measure the sprocket width(thickness).
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  • 0.284" (7.21mm) - 525 chain
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Technically speaking they all have the same pitch (5/8") as you can see they are of different widths. Please note that a 420 and 425 have the same widths as 520 and 525 but their pitch is different(0.5")
Further you will have to decide between stock, O-ring and X-ring. X-ring being the most expensive(and supposedly longest lasting) but in my experience lasts the same as an o-ring chain.

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NEED NEW CHAIN DRIVE UNIT INCLUDING PLASTIC


The model 028 Stihl Chainsaw was in production for many years and the clutch drum sprocket (or chain drive) came in three (3) versions over the years of production.
For several reasons, it is best to take the saw to an authorized Stihl Dealership (Locate your nearest dealership HERE) for production identification, evaluation of cost-effectivness and availability of parts.

Reason 1) The first-generation 028 saw is approaching 30 years old.

Reason 2) Extreme heat caused by a locked chain-brake can damage the engine case and render the saw unfixable (part support is going away due to age).

Reason 3) The shear cost of parts and amount of time it would take for a DIY repair.

Reason 4) The plastic gears you mentioned are the drive system that make the chain's oil pump work. If the plastic is melted, the oil pump is likely to be damaged as well. In most cases the oil pump cover gets damaged ... the list goes on and on.

Genuine Stihl parts are not sold online and aftermarket parts would be a gamble. It's up to you to decide if the cost, time and effort are worth it.
Hope this helps.

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1 Answer

Poulan Super25DA old chainsaw from the mid 70's.


Call your local Power Equipment Dealers and ask if any of them deal with OREGON replacement parts.
OREGON makes clutch drum, chain and bar combinations in the thousands!
NOTE: Along with clutch drum and chain replacement, your bar will need to be changed also, as the sprocket-tip in the nose of the bar will be a different pitch.

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I would advise that you change the bar and sprocket to use a .375 chain as this will be easier to sharpen successfully than the .325 pitch chain you might be presently using.

I am six feet tall and short bars are murder on my back so this is why I use no shorter than 20 inch bars on my saws.

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