Shake or pulsing at high speed

Kristoffer Johnson /

1980 tomos bullet

12v cdi

At high speed (relative to mopeds....25-30 mph) the engine seems to pulse or shake. Note that this is a vertical shake, not side to side. If i bomb down a steep hill with the engine killed at the same speed I don’t experience it so I don’t think it’s the wheels or tires. The moped handles fine and runs well. Always starts easy.

Has anyone else experience anything familiar?

Worn Bushing in the Conrad? bearing going out some where internally?

Thanks for any ideas.

-kris

Re: Shake or pulsing at high speed

I'd check both front and rear sprockets for wear and looseness and chain wear first. Lots of strain on the chain when pulling...……...not so much downhill.

Re: Shake or pulsing at high speed

Overpriced Parts /

Could be clutches/tranny

How many miles on bike ?

Re: Shake or pulsing at high speed

Kristoffer Johnson /

2k maybe 3k miles. I nevertheless have touched the transmission

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