Chain rubbing. Need a creative solution

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Chain rubbing. Need a creative solution

This is a discussion on Chain rubbing. Need a creative solution within the Honda CRF70 forums, part of the General Talk category; So I recently installed a new "Older style" engine cover on my CT70 motor to keep the gear shift lever from hitting the case as ...

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  1. #1
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    Chain rubbing. Need a creative solution

    So I recently installed a new "Older style" engine cover on my CT70 motor to keep the gear shift lever from hitting the case as it has a short gear shaft but now the chain is rubbing the inside rear of the engine cover when the rear suspension doesn't have much load on it. I can't imagine that is a good thing.

    My thoughts were either try adding a chainroller, but not sure if one will fit in the space I have, but I have never installed one.

    Or perhaps try installing a longer gear shift lever and trying a different style engine cover.

    Open to other suggestions also.

    Here is a photo showing where the chain is making contact.


    You will also notice that the new engine cover touches the rear swing arm bolt. I don't think this will matter much as bolt should be stationary in relation to the engine cover, but if I am wrong, please let me know.
    Last edited by jamesfl; 04-20-2017 at 08:04 PM.

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    When you have an extended swingarm and a longer rear shock, the chain will have a tendency to ride on the lower right cover bolt where it mounts to the engine. A shorter shock and raising the front forks a little more may help lower the stance and reduce the angle of the chain between the sprockets. The alternative (don't cringe) is to cut away the rear section of the cover, as seen in the pic below.
    It looks as though your chain has a kink or two in it, indicating rust in the rollers, maybe time for a new one(?) Lastly, the master link locking clip goes the other way, the closed end faces towards the direction of rotation.

    - dirtbkr188 -



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    Thanks for pointing out the issues with the chain. It is actually the same chain that came on the bike when I bought it and I haven't even looked at it, but I do have new ones in garage I can install when I sort the other issues.

    As for cutting the engine cover, mine is the older z50 style. Would that apply to this style cover also?

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    I cut my flywheel cover similar to the photo and that stopped the chain from grinding the cover but my chain sagged and grinned out a place on the engine case. I probably say cut the cover where the chain is and add a roller.

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    Btw, not sure if I have a longer rear shock. It is an early model iShock. When I had it out it looked to be the same dimensions as the 10.25" fastace I have.

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    Quote Originally Posted by jamesfl View Post
    Btw, not sure if I have a longer rear shock. It is an early model iShock. When I had it out it looked to be the same dimensions as the 10.25" fastace I have.
    I'm sorry, when I mentioned longer shock, I meant in relation to a stock OEM Honda rear shock, which is only 9" or so long.
    - dirtbkr188 -



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    That makes sense then. Did not realize stock was that short.

    Btw, thanks again for all the assistance everyone and especially dirtbkr. I am still basically a noob, but I like to think I am a quick study.


    Sent from my iPhone using Tapatalk Pro

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    Stop the presses. I just looked a little closer and my frame has what looks like a mounting hole that would be in the perfect position for a chainroller. The hole feels threaded but unfortunately the largest bolts I have on hand are M8 and it looks to be either m10 or m12.

    What do you guys thinks? Is this hole for a chainroller?

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    Chain rubbing. Need a creative solution

    Just searched up my frame and it is a chainroller mounting hole!


    Now to just find one and some mounting hardware.
    Last edited by jamesfl; 04-21-2017 at 12:15 AM.

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