I'm thinking you may have gone way to big on the jet depending on what was in there stock. If all you did was a big bore 155cc but didn't open up the intake and exhaust then your jet size wouldn't change very much if at all. If it's not getting up to speed even on flat ground then could be your rollers. Check them for flat spots and 10 g rollers may be too light. Get back to us with more info and we can help you sort it out.
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