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tt500 cheeky to start first thing

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I have a 78 tt500


runs real well and is fast 


recently I have noticed it hard to start cold and when it does start it will tick over perfect but when put in gear it will spit and bang for 100 yards then clear and run perfect the rest of the day


it seems to be suddenly low in compression when kicking cold as I can now kick it through tdc without the use of the decompressor


carb is clean


could this be the valves needing set and maybe a points issue as well which is making it spit and backfire


like I say once warmed up, single kick to start and runs like a clock


any ideas  where to start ?







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