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Resync after replacing points?

  • Thread starter Thread starter rlwebster91
  • Start date Start date
R

rlwebster91

Guest
Working on a 78 gs550e. I have adjusted the valve clearances then synchronized the carbs. At the time #3 was waaaaay off, it was pulling a great deal more vaccuum than the rest.

I have recently replaced the points, and set the timing with a timing light. Now cylinder #3 is getting no fuel, plenty of spark, but the header is cold to the touch, and it idles like crap.

It ran quite well beforehand so I'm assuming either:
1. The sync is way off again causing cylinder 3 to not get fuel or
2. The pilot jet for 3 got clogged up somehow

Can the carb sync being too far off cause a lack of fuel to the cylinder?
Thank you for any help.
 
If the sync is off, yes, that can prevent fuel to the cylinder.

That is the reason that I suggest doing a sync before mixture setting.

It's not all that hard to toss the gauges on there to verify.

If the sync is good, it sounds like you will be pulling the carbs to clean out a pilot jet.

.
 
changing the points has no effect on the carb sync, probably a carb issue
 
The points on it were in pretty rough shape, and I synced it with those points and whatever the gap and timing was at. The #3 carb had to be adjusted pretty far off from the others to even them up. I'll hook up the sync gauge and check it out.
 
#3 runs off the same breaker/coil as #2. That would suggest that you'd have a similar issue on #2.
 
I checked the carb sync and it was in fact quite far off, i balanced them out and the bike now runs much smoother. Cylinder 3 seems to be running as well. thank you all for your input.
 
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