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Old 05-19-2011, 04:34 AM   #1
atrent
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Default 1983 suzuki gs400 run problem

I have an 83 gs400s that I resurrected from the junk yard. After some clean up it ran fairly decent and I rode it for a couple of hundred miles. It started to run a bit rough and occasionally stalled. Removed the carbs and dismantled same. Dipped in Berrymans for several hours. Boiled in water and blew out with compressed air. Reassembled with new boots and o-rings. Needed a shot of fuel in cyl to get started. Immediately went to 4000 rpm, stayed there fro several seconds then slowly dropped and evenutlly died. I found that I could keep it going by blipping the throttle and as long as it was kept above 3000 it continued to run. Acts like an air leak but I can't find it. Any one with similar experience?
tank removed and running on make shift tank so pet **** is not an issue.
alex

Last edited by atrent : 05-19-2011 at 08:34 AM. Reason: added info
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Old 05-19-2011, 07:31 AM   #2
Easy Rider 2
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Originally Posted by atrent View Post
Imeadiately went to 400 rpm, stayed there fro several seconds then slowly dropped and evenutlly died.
Not continuing to run at 400 rpm isn't much of a surprise.

Yes, it sounds like either too much air or not enough fuel.
What are you doing with the choke ??
Where is the idle air screw set ??
Might need to adjust the idle speed screw (throttle stop) too.

It will probably do better with the air cleaner in place.
Then to nurse it along, you need starting fluid (ether) or propane works good too.
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Old 05-19-2011, 08:32 AM   #3
atrent
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Originally Posted by Easy Rider 2 View Post
Not continuing to run at 400 rpm isn't much of a surprise.

Yes, it sounds like either too much air or not enough fuel.
What are you doing with the choke ??
Where is the idle air screw set ??
Might need to adjust the idle speed screw (throttle stop) too.

It will probably do better with the air cleaner in place.
Then to nurse it along, you need starting fluid (ether) or propane works good too.
everything is in place except the fuel tank. Applying choke stalls the engine. The idle set screw is not an issue, I have set it high and then backed off and about 2000 rpm it dies. It is 4000 rpm not 400. I wish it was 400, be much easier
alex
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Old 05-19-2011, 04:40 PM   #4
Easy Rider 2
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Applying choke stalls the engine.
Well, that tends to indicate that it is getting too much fuel or not enough air. If you apply the choke slowly, does it improve a bit before stalling out ??

The only thing that comes to mind immediately is floats too high or needle valve not closing.

That's about all I have to offer; hopefully someone else will chime in.
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Old 07-21-2011, 04:02 AM   #5
atrent
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Default run problem

problem solved. Finally pulled the rocker cover and checked clearance. There was none. Set according to specs and troubles are over.
alex
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Old 07-21-2011, 06:19 AM   #6
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Yikes! Good thing you caught that before your valves got bent. Good catch because it sure sounded like a carb problem.
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