Question about 1995 Yamaha YZF 750 R

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Yzf 750 r 1995 starts but when warm wont idle i have turn the tickover up to 2500rmp but then it jumps up and down between 1000rpm and 2500rmp but if i let it cut out it wont sart 4 10mins any ideas people please

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Have you checked connections on the fuel pump,pre ignition test noise is an indication it is connected as it self tests for fuel pump and exup before start.
If pump is disconnected she will run like a pig then cut out.
Another fault could be she needs new plugs /caps,running lumpy and missing is an indication of this as is mis balanced carbs.
Good luck hope this helps.

Posted on Dec 08, 2009

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1 Answer

Idle to high when its warm up at 2000 rpm , how can i lower idle and at what rpm should at be at


Check it's not a tight accelerator cable issue & that there's some play in it at the throttle grip. If there's none, it might just be a case of slackening off the cable at the adjuster where it goes into throttle grip on the bars.
Assuming that's okay but the engine still revs high on idle speed, you'll have to lower the tickover by removing the left middle fairing to expose the engine. If you trace the accelerator cable, you'll see were it sits between the carbs or throttle body if your bike is fuel injected.
There's a tickover screw which will have to be turned out anti-clockwise to lower the revs.
It's not really a hard job to do if you know a bit about engines but if you don't, give the job to somebody who does.

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Hi, Tom and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
http://www.r1-forum.com/forums/102-00-01-r1-mechanical-help/178565-wont-idle.html
Engine starting and idle speed
Yamaha R1 YZFR1 2007 2008 Service Repair Manual Download Download Manuals...
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

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