I recently had a replacement cylinder with larger volume after a break down.
After break it in and I start to drive faster I hear the combustion sound change.
My brain think for a few seconds and my hand go down to the key and turn it off, but the engine continue to runn.
GREAT!! I have a diesel engine on my scooter now.
I wonder if it’s running too hot or if my octane rating is too low so I go to the place where I had the change and ask the owner.
He seams like he’s totaly unable to hear what I say and want to change the ignition lock, but in the end he gets it and tell me to change from 92 too 95 witch I do but I still have the sound so I move on to 98, but same shit.
I go back and he then figure out that 98 is too mutch and drain my gasoline tank and add 95 despite me telling him it wont work.
Afer he’s done I demonstrate by running high revs and then turning off the key that I was right and it did not work.
I ask him to do a compresion test, but who the hell has sutch advanced tool’s here. I know people have it at home for hobby use :raspberry:
He now want to change my piston to a lower model like that would help. I would like to know my compresion befour I let him do that.
The problem ocured at the same contidions on both 92,95 and 98. I think the same would hapend with octane boost too.
I belive it is the head gasket in steel that they cut up to fit the larger bore that cause the problem. The place where they cut is not looking nice and I think the sharpe edges is heated by the combustion on high rpm’s when the heat can not be transfered away fast enough and ignite the fuel mix like it’s done on smal RC car’s.
No listening :loco:
He has ben wrong 3 times, but has not taken my only sugestion yet. :fume:
If I only had a garadge and tool box
I think the problem would go away if I just threated the surface on the cylinder and head in sutch way that I would no longer nead the gasket.
I have tuned my own two stroke 50cc to reatch speed’s off 120km/h and did work for others too when I was 16-20 years old so I would asume I’m woth listening too when it come too smal 2-strokes.