1994 GSXF 600 won't idle correctly
Discussion
Hi all!
I'm very happy that I've managed to get the bike actually started and able to run to a degree. Now I've borrowed a CarbTune off of a very nice gent and set about balancing my carbs (GSXF600 1994). I have an issue that I can't seem to resolve though. I can get it to start (not reliably though) and then run but I cant get the idle below 2k rpm without it stalling. Each time it stalls it won't restart at all unless I use a very small spray of easy start.
Once it starts again it will once again happily run and rev, but only with the high idle.
Any tips on where to start?
I'm very happy that I've managed to get the bike actually started and able to run to a degree. Now I've borrowed a CarbTune off of a very nice gent and set about balancing my carbs (GSXF600 1994). I have an issue that I can't seem to resolve though. I can get it to start (not reliably though) and then run but I cant get the idle below 2k rpm without it stalling. Each time it stalls it won't restart at all unless I use a very small spray of easy start.
Once it starts again it will once again happily run and rev, but only with the high idle.
Any tips on where to start?
bgunn said:
You’ve not mentioned whether it’ll rev out, or whether you’ve tried to ride it? How does it run further up the rev range?
Have you checked the carbs for debris/blockages?
Check for air leaks also.
My apologies, I should have included that.Have you checked the carbs for debris/blockages?
Check for air leaks also.
The carbs have been stripped and cleaned and then rebuild using new seals and gaskets. Jets and fuel passageways blown through with compressed air and carb cleaner too.
It will rev fine in both idle and in gear although I haven't tried riding it.
It seems to run fine outside of the start and idle range though.
Sounds petty but in my experience it can be worth checking the fuel line. I had this once on an old Brit bike. At higher revs and with the choke on the bike would run well but at a low tick over and hence a much smaller use of fuel a very small kink in the fuel hose was causing fuel starvation. Worth checking hoses and also any fuel
Filters - they can be badly fitted so that they slow the flow of petrol.
Filters - they can be badly fitted so that they slow the flow of petrol.
swanseaboydan said:
Sounds petty but in my experience it can be worth checking the fuel line. I had this once on an old Brit bike. At higher revs and with the choke on the bike would run well but at a low tick over and hence a much smaller use of fuel a very small kink in the fuel hose was causing fuel starvation. Worth checking hoses and also any fuel
Filters - they can be badly fitted so that they slow the flow of petrol.
Hey mate thank you for your reply, the fuel lines definitely aren't the issue, I've had it on a remote tank set up and everything. And there's no inline filters on these either Filters - they can be badly fitted so that they slow the flow of petrol.
Check for vacuum leaks. Doesn't take much airto bugger up idle.
ETA.
Spray some WD30 rounds the carb rubbers and see if the engine picks up.
If you have fuel supply/spark and nor isr leaks, I'd probably be pulling the carbs off to check for blocked jets.
ETA.
Spray some WD30 rounds the carb rubbers and see if the engine picks up.
If you have fuel supply/spark and nor isr leaks, I'd probably be pulling the carbs off to check for blocked jets.
Edited by conkerman on Sunday 11th December 13:06
swanseaboydan said:
Get your thermals on and get back in the garage / shed / side of the road !
Thermals are on! HahaSo I've just had the carb bowls off and double and triple checked the pilot jets are clear and the drillings to and from them. I pushed thin wire through the drillings too just to confirm. Rechecked the float heights whilst I was there too. I don't think I'm getting any air leaks around the carb rubbers but that'll definitely be my next port of call.
swanseaboydan said:
Sounds petty but in my experience it can be worth checking the fuel line. I had this once on an old Brit bike. At higher revs and with the choke on the bike would run well but at a low tick over and hence a much smaller use of fuel a very small kink in the fuel hose was causing fuel starvation. Worth checking hoses and also any fuel
Filters - they can be badly fitted so that they slow the flow of petrol.
What you are saying doesn’t make sense. A restricted fuel line would prevent high fuel flow and allow a low fuel flow..Filters - they can be badly fitted so that they slow the flow of petrol.
Does it smell of fuel?
Could be the needle valves/floats letting fuel flood thru which will clear on full throttle openings/on the main jet.
My first look would be the Idle jets thou…they can be a swine to clean fully.
For the cost id replace them (and needle valves and seats) rather than faffing around with cleaning them.
Could be the needle valves/floats letting fuel flood thru which will clear on full throttle openings/on the main jet.
My first look would be the Idle jets thou…they can be a swine to clean fully.
For the cost id replace them (and needle valves and seats) rather than faffing around with cleaning them.
Pench said:
My apologies, I should have included that.
The carbs have been stripped and cleaned and then rebuild using new seals and gaskets. Jets and fuel passageways blown through with compressed air and carb cleaner too.
It will rev fine in both idle and in gear although I haven't tried riding it.
It seems to run fine outside of the start and idle range though.
You checked the carb diaphragms though ?The carbs have been stripped and cleaned and then rebuild using new seals and gaskets. Jets and fuel passageways blown through with compressed air and carb cleaner too.
It will rev fine in both idle and in gear although I haven't tried riding it.
It seems to run fine outside of the start and idle range though.
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