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ZXR750 H1 when riding and I shut the throttle the revs don,t drop below 4 and a half thousand, I have checked air intakes to carbs and fitted new seals but the problem still persists, have cleaned carbs and replaced air and fuel filters
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Check fuel valve is fully open. Check that fuel flows freely from to the carburetor input fitting... just remove line at carb and it should be a full steady stream of fuel.
Check that the primer bulb functions.
Be sure the O ring between backside of carburetor and engine intake is in good condition and in place.
Check breather tube from crankcase to air filter base is not cracked or damaged. Check the gasket between carburetor and air filter base is in place and properly oriented.
I would check a few things. First off make sure the throttle cable is adjusted correctly. Second, try opening the throttle half way and letting go you should hear the inside parts of the carb click as they seat. Third, find the idle adjuster screw turn this anti clockwise and see if the idle speed drops down. Fourth check the choke mechanism is working properly choke/cold start forces a rich mixture to the engine and increases the idle revs.
it is worth checking the pilot air screw is adjusted correctly. Hope this helps.
Arul,
It sounds like you installed a new carburetor and the problem remains. You may have a vacuum leak between the carb and the engine allowing in too much air and causing a lean fuel/air condition leading to high revs. Check your vacuum lines for cracks, check your carb holder for cracks or gaps, listen closely for an air leak. Replace any cracked lines or carb holder with new, or a temporary fix may be done by sealing the carb holder with a silicone adhesive to stop the leak.
If you are referring to P1507 (poor idle), check the IAC valve. That is usually behind the problem. Clean
IAC valve using carb cleaner Check the parts comprised in IAC system
(valve, connector, wiring, solenoid). Use the carb cleaner also to clean throttle
body. Check that everything is OK in the air intake (no broken parts)
and try replacing filter.
Sometimes it is difficult to test in full the IAC valve. Try performing the general testing described summarily here.
If that does not reveal any problem but still is very low, clean
throttle body, MAF and air intake temperature sensors, replace air
filter, check air intake and finally get back to IAC valve and replace
it.
Below a diagram showing the IAC valve in the 4 cylinder engine. Position is slightly different in the six cylinder:
Sounds like a vacuum leak is leaning out the mixture....check the intake between carb and engine for leaks...another source may be tjhe crankcase seals are leaking.
There are adjustments on carbs for low speed air intake (air mixture screw)find out factory settings and reset that mixture.Sounds to me like those adjustments are out of sink.If so the bike will run very bad from idle to about 1/4 throttle then run great from there up to full throttle.this definitly sounds like carb problem.
100% the issue is too much air. get your carb checked, reduce air intake.
open the air intake on the carb about 4 full turns then start the bike. if it does not want to start open the idle bring it up at least 5 turns. when it start at a very high rev, start closing the air intake slowly until you feel and hear you have hit the right spot. adjust your idle in the process.
You must have wrongly fitted it back,check throttle cable and see if the carb air intake is closing properly when throttle is released.This should solve your problem.
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