Engine ping

[tlg1100]

I have a 1981 gs 1100 dyno coil and ingnition.I replaced right hand crankseal and check valve clearence.The bike has some kind of v@h cams.I now have ping in motor when I just let at clutch,only does it for a second at low rpm.In neutral revs up just fine.The timing is at stock setting should I play around with timing or look else where Any advise

[kyscootertrash]

Pinging

If you're already running 93 octane gas, you can try replacing the springs on the spark advance. when they get weak, the spark advances too early, causing a ping. you can test this with a timing light. You should not reach full advance before 2000 RPM, at a minimum. Before tunable ignitions, we would put stiffer springs on the advance of hotter motors to bring in the advance later.

[rapidray]

If the cams you have are SHORT duration, you could have too much cylinder pressure for the timing. If this is the case, you would either need higher octane fuel or to retard the timing. Ray.

[tlg1100]

Thanks for advice shall try them this week end

[Zooks]

When someone says 'ping' the first thing that comes to mind is fuel quality and / or timing.

[tlg1100]

thats about the only way i can describe it.I have had cars and other bikes to same thing and it was gas or timing but for some reason i am concerned this might be something bad, very bad.

[SqDancerLynn1]

WHat they said + My 850 had a habit of pinging when I first got it. replacement of intake boots fixed the problem. Check the boots too!

[Big T]

Air leaks and lean tuning cause pinging - those symptoms are more common in the GS than bad timing

[tlg1100]

I sprayed carb cleaner around carb boots with no change in rpm.Done best I could with lean rich adjustment, have coulor tune have not used yet.Is there better way to check for leaks.What do any gsers do to adjust there carbs.Mine were about 3 turn out, after carb cleaning I started with that, than adjusted tell it seemed to be running right.This was last summer and did not notice [ ping] until lately.

[Nessism]

Check to see if your mechanical advance mechanism turns smoothly as well.

If you have air leaks the idle will creep up when the engine is warm and the idle will be very inconsistent in general and will hang when blipping the throttle.

[tlg1100]

it does seem to be slow coming down after blimping throttle,not sure it does it all the time.