Tomos goes fast then slow

Michele /
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I have a 94 Tomos Sprint. It has new points, new plug, and a few other new parts- It runs great, starts first try every single time. My husband is a 250 pound man, but it gets him to 30mph.

But, when at full throttle, he notices that it would slow down, then speed up- this is a difference of maybe 2 mph- 2 mph faster, then 2 mph slower. But, when he drives it at a slower speed, such as 20 mph, it stays even and doesn't jerk.

I would assume that it's a soft sieze and the head/cylinder is too hot? If that's the case, how do I correct the problem? Add a little more oil? Thanks!

Michele

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