Engine Trouble loud rattling from lower engine

abtexas83

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Oct 2, 2013
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So I just got past the break in stage of my 66cc. This is my first post so please bare with me. But at high rpm I get a crazy high frequency metal rattling noise, Almost consistent with the cheap metal fenders vibrating. But I removed those and pinned it down to the left and right of the lower engine. Its pretty loud so I cant judge if its more on one side then the other. It does this with clutch engaged and not, but it will NOT make this noise when pulling up a hill. It runs solid just crazy annoying at higher rpms.
 
many of these have a really annoying clutch squeal - never found a good way to deal with that
 
So I have narrowed it down to the chain. With the bike parked I reved it up and simply laid my foot on the chain. This removed the noise. But it seems that would make the chain to tight.
 
some chains are worse than anchor chain. oil or replace.


theres too much slack between pinion and clutch gear...they always rattle.

some gears are machined all wonky. better luck next time :giggle:

some bearings are bordering on failure from the word go...replace :)

the clutch gear "floats" in midair. theres bearings in there but they rarely actually contact.

the engines are just plain noisy anyway... its hard to say whats normal and what isnt without having used a few...
 
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