Points & Timing - Reposted

[rickt]

Zero responses first time around!

After solving the problem with a leaking float bowl vent on the '78 GS750C, I took on the points and timing. I was not able to complete the procedure in the manual for setting points. I was attempting to use an ohmmeter (don't have a conductivity meter) and maybe this was the problem. In any case I moved the plate approximately back to approximately its original position, hooked up a timing light and set the timing for 1&4 and 2&3 as per manual procedure.

So, my question is: with the timing set to specs, do I not need to worry about setting the points?

I also tried to adjust the idle screws for max rpm. Surprisingly, turing the screws in or out did not seem to affect the idle speed much for any of the four carbs. Me thinks this is not normal. Where should I start my search for the problem? The bike starts easily, idles fine once warm, but bogs badly when the throttle is opened. I hear a faint backfire when I ride slowly through the neighborhood.

Any suggestions would be appreciated.

[chef1366]

Setting point gap is very important.

[Big T]

Point gap comes first, before you set the timing

So you need to start over with gap on both sets of points, set 1-4, set 2-3

You should put a timing light on it to confirm the timing and the advance

As for your carbs, what are the settings on your fuel screws and air screws?

It sounds lean

You have VM carbs, did you read the CV pages instead?

What's your set up? Pipes? Pods? Need to know

[Big T]

You set the point gaps, then the plates

Reset the gaps and adjust the plates to get it timed

Then confirm advance with timing light

As for your carbs, not enough info

Header?
Pods?
Fuel screw setting?
Air screw setting?
Boot condition?
Cleaned?
O rings?

[rickt]

Stock Everything

The '78 GS750C is box stock:

Stock airbox
Stock exhaust
Air screw: 1 1/4 out
Fuel screw: 1 turn out
Boots in excellent condition
O-rings new
Everything properly dipped and cleaned
New parts in carbs
Valves adjusted and checked again

I'll go back and try the point setting again. Is it not possible to set the points with a feeler gauge?

[chef1366]

That's how I always did it.