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Hello. So I installed 80cc (81.3cc 54mm) BBK just because it would be easier to sell this scooter next year.

What is the correct valve clearance for this 80cc bbk? In kymco manual says 0.4mm, but others use 0.004inch.
What weight of rollers you suggest me to use? ( I got 5.3g, original, 9g )


And I don't want to create another topic:
When I managed to turn it on, I didn't manage to get it to work properly. Only 2 or 3 times I was able to make it to the max throttle, other times failed. It just can't go over not even stable idle. There was a lot of unburnt fuel and my secondary air system (i guess it is a pump) started to be confusing. Bottom cover kept getting off because of the air pressure that came in, it even broke the sides of cover... Yes i have changed the spark plug to new (the old one was doing pure sparks).
And also when I touch my rear brake cable to the scooter, it gets short circuit. (I got some smoke coming from the bottom of the scooter one time when managed to burn my starter and I took it of). Then the spark plug was old.

Hi everyone. I derestricted my scooter and now I'm having problems with it.

I didn't need to change variator boss roller, because it was already changed before, so I only changed the whole variator to Naraku High Speed variator with 5.3g rollers. Also changed the drive belt to a new one for lightly tuned scooters. Then I changed the CDI to Naraku Race CDI (no rev limiter). Last I did change is carburetor main jet up to #82.
I tested it once and it goes ~65-70Kmh, and 80+ Kmh downhill. Later I tried it again and the problems have started. When I go with scooter ~ 55-65kmh, it starts to lose RPM till it fully turns of if I don't release the throttle. Also same thing going uphills (had to stop 3 time till drived up ~100m uphill).
My father told that it could be the too small main jet (#82). I live in Lithuania, it's ~0 to +4 degrees celsius right now, not much above sea level.

Where do you guys think is the problem?