Question about 1991 Suzuki GSX-R 750 M

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It will not idle

My idle will not stay at 15..when its too high...I will adjust it down... it will stay at 15 for 5 seconds then drops down too low until it cuts off.

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Have you had your carbs balanced? Its recommended that you get your carbs balanced at a service. This symptom sounds like it needs done. You have to remove the fuel tank, but set up an alternative fuel supply to the carbs. On top of the inlet manifolds, there are 4 bungs which can be removed and vacuum gauges fitted. You then have to run the bike and set the carbs until all the gauges line up. Bit of a fiddly job if youve never done it before, so possibly a job for your local garage.

TL

Posted on Jan 26, 2009

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6ya6ya
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Posted on Jan 02, 2017

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Then accelerate to highest speed and set the high adjustment for highest rpm. Then go from idle to high speed. If not smooth a small adjustment on the high speed screw is in order. Keep doing that until you get a nice smooth transition form low speed to high speed.

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You could reset the computer, but then it has to go through a drive cycle to adjust all the settings. It should idle high when first started and drop down after 5-10 seconds or so. The computer will adjust it after a few trips, but should be fine.

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Hi Robert:
Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
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Alway use the "lightly seated" method if you have not changed the screw settings.
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1 Answer

Rpm does not drop below 1000


No,only on carburated engines it,idles down to the set point,on yours,it's fuel injected,pushing gas pedal won't kick idle down,should go down after a certain amount of time,does it automatically,If you start and drive a 5 mile ride and stop at a stop sign,it should idle at it's set point if there's no engine problems,which may be.5 to .7 on your tac.When you normally first start,it will idle between 1000 to 1200 rpm's,don't push on gas,let idle say 15 seconds,put in drive and go.

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97 yamaha 600r at idle the rpms slowly drop insted of a sharp drop when throttle is let off thinking the jets maybe stopped up or has a fuel return issue, or the carbs are not in sync. thanks


Hi, Etka2800 and the usual suspects are:
1. Idle speed improperly adjusted.
2. Air fuel mixture screws not properly adjusted.
3. Inlet system air leak.
4. Leaking accelerator pump.
5. Loose low-speed jet.
6. Plugged low-speed jet.
7. Contaminated or plugged low-speed circuit.
8. Enrichner valve/choke not seated or leaking.
9. Multi carburetors out of sync and need to be balanced.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
YZF600R Forums View topic Idle Speed
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Yamaha YZF600 YZF600R 1994 2007 Service Repair Manual PDF Download Manuals...
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Yamaha YZF600RP Owner Manual

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