New Here,, Alittle help please, no power at take off

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Spydr9

New Member
Aug 18, 2011
1
0
0
Waterloo Ontario
Hi there,
Been following this forum to figure out most issue with the bikes i have built(many so far for friends) I have built 2 to keep. One for the wife, One for me....
The Bike..
66cc Motor 2 seasons old running well
36:1 mix syth oil 91 octane
Expansion Muffler
nt speed carb(second notch .68 main jet)
36 tooth sprocket
ngk plug and ngk racing wire
slant head
trek 3700 frame, 2.6 krad tires

Problem:
cold or warm/ no power at take off, i Have looked for leaks cant see
any,once she is moving it moves. tops out at 64km/h cruises at 58.

It just seems that there is no bottom end power, most other builds hardly need to pedal and they take right off, this one is slow till i hit 20km/h then she goes,,,

almost like it is lacking compression, other thing i noticed i can move it will little effort with the clutch out, i can turn the small gear inside with a flat screwdriver and the cylinder rotates easily almost like the is no plug in the engine.
Like i said though there are no visible signs of leaks...
Could this be a sign of worn rings?
Ideas?

any help would be great