Chain slack on extended swingarms/Chain Roller

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Chain slack on extended swingarms/Chain Roller

This is a discussion on Chain slack on extended swingarms/Chain Roller within the Z50, CT70 and JDM Monkeybikes forums, part of the General Talk category; With my new +1.5" swingarm, my chain has crazy slack when at rest. Assuming it still goes while riding as I can hear it buzzing ...

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  1. #1
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    Chain slack on extended swingarms/Chain Roller

    With my new +1.5" swingarm, my chain has crazy slack when at rest. Assuming it still goes while riding as I can hear it buzzing away as it rides on the bottom rear stator cover bolt. It might need to be adjusted tighter. To adjust, I removed the rear shocks, aligned the front sprocket, swinger pivot bolt, and rear sprocket and set it there. No idea how much slack is need though BUT regardless, the extended swingarm and taller shocks create a terrible angle of the bottom the chain.

    So, on an 84 Z50R frame, what do you guy recommend for a chain roller? I have looked around and most seem to be made for XR/CRF's. Not sure if their frames are different down in that area. Ideally, it seems that if only the rear brake pivot that is welded to the left side of the frame extended out a bit, one could just you that. It doesnt (at least on an R frame) so where does one get mounted? Also, I have seen both fixed and sprung units. Most of the sprung ones off ebay look terribly poor quality BUT one, under closer inspection is much better and warrants the price jump from 7 to 14 bucks. Would love to see what you guys are running and recommend.
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    OR...on bikes with with longer swingarms and taller shocks (i.e. not a low stance) is better practice to remove the lower rear left case cover bolt and material of cover. The idea being then the chain has a straighter path with no obstruction??

    It also dawned on me that I have no idea how much my bikes shocks actually travel AND that with the sprockets and pivot point lined up, the chain should not need a much slack as that is the tightest it will ever get.
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    Suspension tips look from page 61:
    http://www.daytona.co.jp/catalog/img...17_model01.pdf

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    Swingarm ? AFT ? 3? Extended ? All Models | TBparts.com


    tbparts says they have a good place to add chain roller to the z50 frame.they say if you email them a hondatb@aol.com they will send some pics. I haven't emailed yet as the extended arm is not in stock yet. I see where you can weld one on but they also say you can bolt one on too.

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    Thanks. I just emailed them but note, the email has changed.

    I'll see what they say. Really been thinking about the removal of the lower rear bolt. Seems more common in custom bike with this issue then rollers
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    tb says you either have to drill and tap or drill and weld to get roller on.
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    Yep. That what I assumed and what TB told me as well.

    So, why do I see so few modded bikes overseas using chain rollers? Would it be better to remove the bottom rear bolt from the stator cover and modify that so the chain is free?
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    Quote Originally Posted by 66Cooper View Post

    So, why do I see so few modded bikes overseas using chain rollers?
    Because the chain would be too tight on full compression or too loose on full sag.

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    Sorry, the point I was trying to make was that it seems most modded bikes don't run a roller because they are using a modified stator case and/or takegawa case, which do not use that lower rear bolt...which is what is causing the problem.

    A chain roller does work to eliminate that issue but I think I am just going to modify my stator case to emulate the takegawa one, eliminating that pesky bolt and be done with it.
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    since mine is completely apart I will probably be drilling and taping to put a chain roller. "not as easy as they make it out to be in the swingarm description. I will also be modifying the cover. believe I read on here that their is a "scribed" outline inside the cover to show where to modify? I dunno, don't have cover off

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    You follow the contour of where the inner part of the cover prevents dirt and grime from getting into the stator/flywheel area.
    Drill a series of holes along the inner part, then use a small hacksaw to cut between the holes, and do the final finish work with a belt sander.

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    I was looking more closely at the takegawa cover they actually still use that lower rear bolt. All the bikes I see with extended swingarms and aftermarket shocks must be running their overall height a bit less then I am as they, at least appear, to not have any issues with chain/lower cover bolt interference.
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    I was looking at a build thread "1981 z50 first ground up build" by Joedarr33 and he is running the 3in extended with 330mm shocks without a chain roller but he is running a 140cc piranha motor. chain looks extremely loose. Do you honestly need a chain roller if you run a 3in extended with 330mm shocks? dirtbkr188?

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    It all comes down to the swingarm angle and if there is any interference with the case I'd say.
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    *personally I find 330mm shocks better suitable for a +6in swingarm, much better chain flight...*

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