Tomos engine knock

Anyone know what would be causing this knock/rattle?

Bought it a few weeks ago and rode fine, suddenly started making this noise. Only happens during idle, when given gas it stops. Happens when engine is cold and hot. This engine has airsal 70cc kit on it fyi

Re: Tomos engine knock

Dirty30 Dillon /

What piston are you running on that A55 kit? Because AFAIK that's not a kit that was designed for the A3 motor, so unless you swapped for a 12 pin crank and spaced out the cylinder, you're in for a plethora of issues.

Re: Tomos engine knock

It sounds like piston slap a little bit. But if needed there are specific plug and play kits for the a3.

Re: Tomos engine knock

I don't know, I'm not very knowledgeable about these things. Previous owner did all the work himself. I can ask him and see if I can get any info. Hope it's not that!

Re: Tomos engine knock

Just had to tighten the clutch nut. Purring now

Re: Tomos engine knock

Yes the a3 tranny does have that hideous teeth grinding slap noise at idle, and shifts. Think its normal.

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