2 stroke lean detonation

So this is what might happen if you have high compression and ride a bit lean.On half throttle there was always some wierd rattle (detonation)i only got 500 km’s on this BBK.
As we can see the piston pin has made its way out, a strong groove about 1mm is on the cylinder wall at that side, amazingly it still had 8 bar compression and was running fine at higher revs.After installing a new BBK i got the same rattling detonation sound, but raising the needle clip 1 notch solved it.

Naraku racing CDI problems

So if you gona buy a CDI, be warned that it might not have the same strong spark as your old CDI.
This CDI only worked if gapped below normal, i should add that the engine had 14-15 bar compression with a 70cc bbk, so thats one of the reason for the poor performance, but the fact remains, Stock CDI gives me much stronger spark.
Well, its not all bad tho, with a weak spark you have a less chance burning down the coil, beacause very strong spark = dead coil.