Kick starting poor compression

[Chris in Margate]

Anything over 100 PSI is fine. Mine has been 105 for 2 years. Again, only an indicator.

[Scooterdude]

Anything over 100 PSI is fine. Mine has been 105 for 2 years. Again, only an indicator.

of course gauges can vary considerably, mines a gunson from way back in the 70s so could be considerably out. As you say only an indicator.

[kennystag]

Hi Mate,
80 PSI is plenty to start your engine, so do not panic. Probably stuck rings. Try bump starting it.
Cheers
Stag

[Chip Panfire]

Thanks again for all the input and welcome to the forum Kenny.
Will try a push start next time I'm at the workshop.

[EddieStone]

I built an engine recently that was right bu99er to start. Eventually noticed how little compression there was when I noticed I could turn the flywheel by hand easily. Stripped it down and found I'd used the wrong piston and it was about 3 oversizes too small!

[kennystag]

Thanks for the welcome Chip Panfire, and good luck with your lammy.
Cheers
Stag

[johnduke]

Hi , my 175 conversion pinks like mad at 45mph plus . Timings set 16 degrees just checked with compression tester 175psi . squishe is only .85 so will add .5 to base or head (dont run ahead gasket at the moment). Think that i will have to remove metal from combustion chamber as well as gasket. As well as pinking i dont think kick start will last too long with this much compression . Dont want to remove engine to check head volume so what psi should i aim for? thanks John