Scooterotica

anyone set the timing with a strobe light? we all talk of setting the timing using the positive stop and mean difference method,anyone tried this?
regards
joe

i use positive stop to avoid taking head off...... its easy and arguably more accurate than a dial guage

paul , does chalky use a timing light?

On an electronic no matter what way you find TDC and measure degrees BTDC the only way to guarantee it is firing at that point is to use a strobe light as you cannot trust the pick up line and flywheel marks. Surely everyone uses one.

I put my timing marks onto the mag housing using dead stop, and degree disc then check piston travel to timing mark. then when the engine is running check the timing with a strobe ...... Sad I know, but it gets me out of the house....

firekdp wrote:On an electronic no matter what way you find TDC and measure degrees BTDC the only way to guarantee it is firing at that point is to use a strobe light as you cannot trust the pick up line and flywheel marks. Surely everyone uses one.

agreed last one i did positive stope was 2 deg out with the strobe to much on a ts1 prob ok on a std 150

I set it using the positive stop method and check it with the strobe, as others have recommended on here.

It's quite interesting to see the firing point move relative to rpm

yeah, always check with a light.
I've found what works best on a lambretta are the cheap gunsons infra red in line ones.

Hi Joespeed
What sort of strobe light gun are you thinking of using

i have a 'mactools' light,this when used on the cars has a feature which enables you to set the timing at any required advance or retard but picks up on the tdc marks,i am curious as to what revs you run at 'byron' using the gunson gun?
as 'sideout' says there is quite a difference when the revs are adjusted,so depending on what revs are applied the timing will either be 'ok' or 'out' so is this accurate or not,i cant find any literature that gives an accurate measure for this,i would be pleased to hear of someone who is using this type of gun to set the lambretta timing and achieving good accurate results!!!
regards
joe