Chain Noise

Discussion in 'Frame Mounted Engines' started by Dr. J., Nov 26, 2006.

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  1. Dr. J.

    Dr. J. Guest

    Inspecting my front drive sprocket I found abnormal wear using 415 (wide) chain. After 249 miles using 415 chain, my kings 80 cc motor was becoming very noisy. The sprocket had wear marks underneath the teeth on the shoulder. The chain was riding too low. If you take a good look at the relationship of the chain to sprocket, you can see where the chain rubs too low on the sprocket.

    To fix this problem, I machined about .045 from the sprocket width to end up with a sprocket to accommodate the use of narrow chain. I chose high strength BMX bicycle chain. The chain I used was KMC Z510H 1/2 x 1/8 inch.

    In conclusion, the bike was faster and resulted in a 70% noise reduction. Also, chain stretch is nil.

    Dr. J.

  2. gone_fishin

    gone_fishin Guest

    welcome, Dr. J :)

    that's some great info...thanks very much!! 8)
  3. gone_fishin

    gone_fishin Guest

    by golly he's right!! the larger chain also wears a groove inside the cover-plate, nice catch... 8)
  4. Dr. J.

    Dr. J. Guest

    This may be the cause as to why the 415 stretches continually. The BMX chain (Z510H) has no bushings, extremely strong, and very light weight.

    Dr. J.
  5. gone_fishin

    gone_fishin Guest

    i'm bumping this because it's an important 100 miles i already had a groove going on the inside of the cover. that HD chain's cool, but way too large.
  6. mrsaxman99

    mrsaxman99 Guest

    could you possibly post a picture or two showing how you modified the drive sproket?
  7. gone_fishin

    gone_fishin Guest

    fyi-i was lucky to have available an old chain off a worksman tandem...i didn't make any modifications to my drive sprocket, it just went right on there 8)
  8. blompod

    blompod Guest

    good to hear that it goes straight on the front drive sproket, I was trying to fit that big stonkin chain today and cant see how it would even go round the drive sproket and clear the casing. Im off first thing in the morning to grab a bmx chain. As my bike comes together its really starting to look like a little retro motor cycle, hope I dont get busted. But it looks way cool.
  9. alesterfeind

    alesterfeind Guest

    I just came across this today and wanted to find out how well other chains have worked. So some of you have used bicycle chain instead of the HD chain that comes with the kit? If so, which chains have worked best and not broken? I notice the mentio of BMX chain Z510H. Thanks for any information.
  10. azbill

    azbill Active Member

    I have been running the Z510H chain for well over 1000 miles now, it has never stretched, or given me any probs
    they are made for stunting bmx's, and are designed to handlke the torque of landing
    I would not hesitate to reccomend it to anyone
    they are really cheap from (I think I paid 6-7$)
  11. alesterfeind

    alesterfeind Guest

    I asked my local bikeshop, and they don't have the Z510H. They do have Z410MP(regular) and K415h (oversize). He says oversize is HD. Would either of these work, or should I continue to look for the Z510H?
  12. azbill

    azbill Active Member

    the Z510H is much narrower than the chain that comes with the kits
    not only is it stronger, it solves a lot of clearance probs
    unfortunately, it doesn't seem to be on bikenashbar's site any more (must be why I got it so cheap !)
    the full make/model is KMC Z510H (brown) Z510HX (silver)
    if I need another chain in future, I will find it elsewhere
    the 415H is same size as comes with the kit, but is will work fine
  13. alesterfeind

    alesterfeind Guest

    I found another shop in town that has a 1/2 x 1/8" Pin Length: 9.4mm, which is the same size as the Z510H. He had no clue about the term Z510H, but thinks that the chain he has is solid. I thought all along the stock chain was too big, heavy and noisy, so I would like to find a reliable alternative. I will give this one a try unless I can find the exact Z510H. Thanks Azkronic.
  14. azbill

    azbill Active Member

    no problem
    just trying to help :D
  15. drimpact

    drimpact Member

    I have been using the KMC 415 bike chain for all my bikes. It is very smooth and quiet, I havn't really noticed any stretch at all! Thanks for that tidbit azkronic makes me feel good about my decision to run this chain. BTW all 400+ miles and about 800 miles have been ridden on this bike chain with Zero problems.

    I might try the 510 chain someday...
  16. azbill

    azbill Active Member

    all good
    we're here to help !!!
    (I watch too many cartoons with granddaughters...Koala Brothers :lol:)
    Last edited: Oct 5, 2007
  17. Chinese "415 heavy duty chain"

    Hi all, the plates, rollers, and pins are all soft on this chain I NEVER use them, and in addition, I spec'd all MY kits to be imported with BICYCLE sized primary sprockets, we use KMC chrome Cruiser bike chain, with wonderful results.

  18. motorbike91

    motorbike91 Guest

    081, 415, bmx chain? which engine sprockets work?

    I have a 70cc ebay(fastboy) kit on a greenline cruiser bike. I bought a 1/2" x 1/8" bmx chain to reduce the chain noise. It fit around the rear sprocket fine, but not on the engine. I started grinding down the width of the engine sprocket teeth, but it still doesnt fit well. So my options are return to the 415 chain and buy a new replacement sprocket from thats dax... or buy the sprocket and the 081 chain.

    Does anyone have experience using the 081 chain? I'm curious if it will stretch like the 415, be as noisey as the 415, and if it will work with the sprocket on dax's website.
  19. Alaskavan

    Alaskavan Guest

  20. alesterfeind

    alesterfeind Guest

    Azkronic, did you have to machine your engine sprocket to get the chain to fit. Seems like a few have had to do that. I got my chain, but have not put it on yet.