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FINALLY runs

  • Thread starter Thread starter SB3
  • Start date Start date
S

SB3

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I've worked on my 78 GS550 for a couple of months now and I can finally say its running now!
I replaced the ignition coils, checked my valve clearance, new shims, new spark plugs, swapped out for a dyna, rebuilt my carbs (disassembled and soaked in chem dip for 24 hours, new O-rings, gaskets). And all 4 pipes are getting hot.. FINALLY!
My question now is should I sync the carbs if its running good? My other question is it idles good and I took it for a ride and it cruises fine until start to accelerate and try to get up to speed then it starts to act like its getting starved of fuel. How do I go about getting the fuel mixture just right? Keep in mind I followed basscliffs instructions on the VM carb rebuild and set the fuel screws out 1 turn after seating it and the air screw 1 and 1/4 turn.

Thanks!
 
Try running petcock on PR to see if fuel starvation weakens when you accelerate ....stock airbox stuff or?
yes sync them...did you at least bench sync them?

Your progress is good!
 
Yes, stock airbox and stock exhaust. Yes I bench synced them the best I could. Thank you!
 
Test your petcock flow
Are you using a fuel filter?
The mixture screws are for idle only and should be fuel -3/4 turn and air 1 1/2 turn to start, then tune with high idle method
Yes, you should sync the carbs
What RPM are you revving it t
 
I also replaced the petcock and yes I am using a fuel filter. I'm not sure what RPM's I am reving at because my bike did not come with a tachometer.
 
SB3 said:
I also replaced the petcock and yes I am using a fuel filter.
Click to expand...
What filter are you using? Many problems happen when an automotive-type filter is used. The problem is that they are too restrictive. Since they are intended for a vehicle with a pressurized fuel system, it's not a problem, but with our gravity-powered systems, they simply can not flow enough.

Your new petcock already has a filter. If you really insist on adding another one, get one for a lawn tractor.

.
 
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