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Idling rpm's all over the place

  • Thread starter Thread starter Hoges
  • Start date Start date
H

Hoges

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My idle won't hold steady rpm's and needs a constant blip of the throttle to stop it from dying at idle. When I do this but, it goes up to about 2000rpm's for a sec or two before dropping back to less than 1000rpm's and then falling away to stall. Its a GSX750SE and am thinking it's an air leak maybe. All the boots are snug and tight with nothing visible being wrong. I've been playing around with the mixture screws and at the moment seems best at 2 turns out. Any help or advice would be welcome, cause it's making city riding a nightmare.
 
Get a can of carb cleaner or WD40 and spray the carb boots. If you get a change in RPM then you have a leak.

When was the last time you cleaned the carbs?

Also check your throttle cable, if it is binding or not adjusted properly the engine RPM's will be all over the place.
 
Sprayed WD40 onto the carb inlets and no change in rpm's. Have cleaned carbs 500 miles ago so should be okay. I've just taken the air filter out to see if that makes a difference, so will give it a run. Plugs all look okay as well.
 
Yeh Chef, it's a 16valve motor, and I only did the valve clearances last month. I know its not much, but its bloody annoying. Little bit of a miss at low revs (2000rpm) as well, so I'm thinking its a mix problem. Its good this site for new ideas when tracing similar probs.
 
for me it was actually the other way around...
i never knew that the usa 16v models were NOT called gsX until i joined this forum - lol :eek:
europe, the uk, and "down under" - all have the gsx denomination


oh, btw, id say you have a very lean condition and/or an intake leak
 
get your idle mixture screws right. They are too lean.
 
Last edited:
Dirty pilot air jets, pilot jets, idle mixture screw o-ring bad or maladjusted.
 
Thanks for the replies on this one. Mixture screws std at 2 and 1/4 turns out,so to richen it out do I turn it out??
 
Thanks again chef, hard when you look at life from upside down hehehehe.

Rob.
 
Is this the Pop Up headlight GSX 750 SE (otherwise known as a Katana 2)?
 
Hey there Smokin, yep it's the Katana 750 with the pop up headlight which is another story in itself. Has a mind of its own sometimes...
 
I'm having much the same issues with mine. It's a Jap spec, meaning it's "detuned" to 77 HP max. All original and complete, however my exhaust pipes are rattling something fierce. I've been fighting carb issues all summer long and am about to just throw some pods and a pipe on, then rejet for that. Gets lots of looks, though.

My 82 Katana is in pieces right now, getting a repaint and gasket set. Somedays I hate my motorcycles - they cause me too much grief. But when they run good, oh man there's nothing else like it!

Good luck with yours.
Shin-Ken is also a Katana guy, as is Katman and I think Giablo.

Have you contacted www.katanacentral.co.uk ? There is a forum there with some helpful information as well, but not nearly as good as the GSR.
 
Hi there Smokin,

great bikes and the 1000 katana is quite rare over here and is much sought after. Good examples of the Katana 1100 are around AUS$5000-8000. The pop up is my second and the easiest to ride as in comfort, just that damn headlight crap bugs me about it.

Rob.
 
plug color ?

plug color ?

whats the plug color ? should be tan or dark brown.

blackish - too rich
whitish - too lean...

you should get a good idea on the mixture based on this...best is to use a colortune plug to get the correct setting.

- A rich problem gets worse as the engine heats up.
If the throttle is lightly "blipped" at idle, and the rpm drops below the set idle speed, then rises up to the set idle speed, the low speed mixture screws are probably set too rich: try 1/2 turn in, to lean the idle mixture.
- A lean problem gets better as the engine heats up.
If the throttle is lightly "blipped" at idle, and the rpm "hangs up" before dropping to the set idle speed, and there are no intake leaks and the idle speed is set at less than 1000 rpm, the mixture screws are probably too lean: try 1/2 turn out, to richen mixture. Be sure there are no intake leaks and the idle speed is set at less than 1000 rpm!

hope this helps
 
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