hi all So my bike has been running spot on until the beginning of the week and now it won't run atal My set up is 70cc pro sport kit Standard crank Motoforce 19mm carb 94 main jet Malossi cone filter that has the cover 6.75 rollers Stage6 exhaust Stage6 inlet manifold Motoforce coil pack Running premix All was fine until Monday night riding home it had a little cough and splutter but didn't think anything of it as still ran fine Next day on the way to work warmed up and idled fine got down the road at full throttle and spluttered than cut out, would start up fine but as soon as I went to ride it past 1/4 throttle about 10mph it would splutter and cut out. Pushed it to work replace the fuel tap as it was original and needed doing, stripped carb and cleaned it Checked piston and cylinder no visible score marks Put it back together and started fine let it was up and problem is still present I went down jets in stages to 86 and didn't really make that much of a difference Only thing I have done since it was running perfect was top fuel up and used different 2 stroke oil than I usually do (usually use castrol but petrol station only had motal, or similar from texaco) I'm now lost at what my problem could be?
I sprayed around the inlet with brake cleaner and there was no change in running to suggest a leak Reeds look ok with no bends or damage in them, I do have a spare set that I will try I done a compression test and it was 7.3 bar about 106psi I don't know what the compression should be Checked wiring and found no visible breaks or corrosion Going to get new cylinder gaskets
