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Thread: Awesome idea with Motorcycle || Let's Learn Something

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    Supporting Member Let'sLearnSomething's Avatar
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    Awesome idea with Motorcycle || Let's Learn Something

    I make this Motorcycle idea to prevent the chain jumping to the rear sprocket.
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    Last edited by Let'sLearnSomething; 11-28-2018 at 03:52 PM.

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    Supporting Member Let'sLearnSomething's Avatar
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    Let'sLearnSomething's Tools
    500+ Homemade Tool Plans

    Guys Check it out my new unique motorcycle idea
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    PJs
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    PJs's Tools
    The idea for an idler tensioner is interesting and homemade is great. Thought maybe use an older drive sprocket on a bearing (skate bearing?) would engage the chain better and have less chance of the bracket from slipping and accidentally hitting the chain with unwanted consequences. The biggest issue to me is that chains never stretch evenly so if it should get out of sync with the center stand spring tension with the sprocket or roller in a corner especially might be problematic.

    Thanks for sharing your builds!

    PJ
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    Supporting Member Let'sLearnSomething's Avatar
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    thank you for the advise bro. Safety First

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    Supporting Member olderdan's Avatar
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    olderdan's Tools
    Quote Originally Posted by Let'sLearnSomething View Post
    Guys Check it out my new unique motorcycle idea
    Great resourcefulness but I have never seen one attached to a centre stand before and it really worries me. I do share Pjs concerns, the rpm of any roller or small sprocket in contact with a chain is likely to be excessive. Better to use a slipper guide instead which controls tension and guidance.
    If the stand grounds when cornering as is not uncommon this will surely dismount the chain at the worst possible moment.
    This is a cheap universal guide, frame mounted and modified to fit my 1953 DOT trials bike.

    Awesome idea with Motorcycle || Let's Learn Something-imgp0001.jpg Awesome idea with Motorcycle || Let's Learn Something-imgp0002.jpg
    Hate to see anyone have a bad ride.

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    Supporting Member Let'sLearnSomething's Avatar
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    thank you for the advise bro. Safety First

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    Depending on the chain geometry sometimes you can fit a stationary roller/guide block that will control slack at full droop and as the suspension compresses and the chain tightens it lifts up from the roller reducing the amount of pressure until at full bump it may be just off the roller, but with little slack needing to be controlled. You may have to experiment a bit with the height/fore-aft location of the roller until you find the sweet spot where it works best.

    Aftermarket rollers with bearings are readily available as replacements for the OEM rollers on modern dirt bikes.

    cheers,
    Michael

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    PJs
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    PJs's Tools
    I think these work fine for dirt bikes and particularly trials bikes where long travel requires a looser chain setting and ok for slower speeds in trials. Street bikes I don't know if its necessary or warranted, but did have an experience on a trip on my Z1 where the cross wind was so strong for miles on a straight road, I had to hold a 10-15° lean just to keep it straight and the gusts were a bit scary...finally pulled into a rest stop somewhat bedraggled and my chain looked like the belly of a fat cat. I had adjusted it that morning before I set out. Couple of wrenches and the center stand and I was off again. To me adjustment on a street bike is the proper way...and replace the chain and/or only if need be remove a few links. Had a friend once that didn't keep his chain adjusted on a Yamadog 250, it came off, jammed up, broke his case and threw him on the ground Hard...in a corner of course. Another had a chain break and tear up his calf and heal (no chain guard)...I take my lessons anyway I can get them.
    Last edited by PJs; 12-02-2018 at 12:29 PM.
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    Supporting Member Frank S's Avatar
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    yep fine idea for dirt bikes not to sure about using the center stand but I never owned a bike that had a center stand. that I remember wel maybe I did have one back in the 60's that had 1 My bikes wer too heavy to be lifted up on a center stand by less than 2 or 3 people
    I can relate to riding in a cross wind about as much fun as having to ride in an ice storm with no face shield on my helmet and no windshield.
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    I used a skateboard wheel on a rigid frame. It is not is constant contact with the chain and was only used to keep the chain from slapping the oil tank during engine braking when the slack would transfer to the top of the chain.

    For the most part, if you have good sprocket and chain and keep it properly tensioned, there is little risk of the chain coming off.
    Why buy it if you can build it.

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