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jimbob69

WARNING: 12 tooth sprocket users.

11 posts in this topic

A while back me and my brother in law went to hit up some one ruts, so i put a 12 tooth sprocket on the front. I got it on and noticed a lot of drag on the wheel , couldnt figure it out, wasnt the bearings, wasnt the chain beein too right, wasnt anything internal. So i said just forget it, i rode the bike around and it was fine. BTW im runnin a primary drive o-ring chain witch is real wide do to use of cheap matierials, its gotta be wide to get the strength.

I go a couple days later to change back to a 14 tooth.

And i found out where the drag was coming from, the sprocket was soo small that the chain was rubbing on the case, it looks perfectly machined, but it must have weakened it sufficitently (sry bout spelling and grammar.)

It must have wore off almost 1/8 inch in, im sure it has to do with my wide chain. Next time i have my sprocket off ill take a pic and post it.

~jim~

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What kind of sprocket was it? Yeah, I read about your chain being cheap and substituting thickness for strength...

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I am interested in the photos when you get them.

I am glad I have stuck to stock for the sprockets but I do have a DID xring chain.

Sounds line a case check needs to become part of regular services.

Cheers,

Mark

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It was a wierd brand sprocket, started with a T, got it on clearance for 4 dollars on rockymountainmc.com

I'll deffinentally get pics asap.

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It was a wierd brand sprocket, started with a T, got it on clearance for 4 dollars on rockymountainmc.com

I'll deffinentally get pics asap.

You know how the saying goes; "You get what you pay for."

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How does a smaller front sprocket equate to the chain rubbing the case?

If anything wouldn't this bring the chain farther away from the case (or your case guard which it sounds like you didn't have on).

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I am running a 12 t, with an oring chain, no problems. The 12t makes the yz426(with a 49t rear) a damn fine trail machine in the desert southwest.

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How does a smaller front sprocket equate to the chain rubbing the case?

If anything wouldn't this bring the chain farther away from the case (or your case guard which it sounds like you didn't have on).

not the "smallness" but possibly the "wrongness" if it didnt have the correct spacing. (that small boss on the inside of the sprocket). it might have had the correct spline size but not the correct alignment.

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not the "smallness" but possibly the "wrongness" if it didnt have the correct spacing. (that small boss on the inside of the sprocket). it might have had the correct spline size but not the correct alignment.

Now that I can understand. Not the correct sprocket then, or was installed the wrong way. I received a rear rotor that was marked with the correct catalog numbers but the rotor did not fit. Mis-marked product.

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The sprocket is a Titax, not a Tusk. RM doesn't carry Tusk sprockets, they are Primary Drive and what used to be Titax. As mentioned above the chain is probably the problem.

Are you sure the swingarm isn't being grooved???

Also, running a 12 is very hard on chains, especially on a high HP motor running a cheap chain. I would recommend bumping up to a 13 and buying a real chain before things get expensive :thumbsup:

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