Question about 1993 Yamaha XJ 600 Diversion S
Yamaha XJ600 (pre divi) has Mikuni carbs and K&N filters, and there is fuel flowing from no 3 carb. revs and power are very hit and miss, and at one point it started to accelerate revs by itself.
Hi, Bevstait and the usual suspects are:
1. Extremely lean fuel mixture.
2. Dirt, rust, water, or ethanol sludge in the fuel system.
3. Sticky throttle cables.
4. Multiple carburetors not in synchronization.
5. TPS sensor out of adjustment or faulty.
6. Wrong spark plugs for the type of service.
7. Throttle bodies not in synchronization (FI)
8. Faulty O2 sensor.
9. Clogged, stuck, or faulty IAC valve.
10. Aftermarket components not compatible with ECM.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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surge at steady throttle
Yamaha FJ Owners Workshop Manual
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Posted on May 29, 2017
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Posted on Jan 02, 2017
sounds like the main jets are partly pluged, you must remve all brass jets and seats including needle jet and its slide soak in carb cleaner and blow out with compressed air only.. hold up to bright light to verify if all are clean. jim
Posted on Mar 29, 2009
I had a similar problem. For the float needle there is a seat that it goes into, check this for dirt first, then if no dirt present, the brass part (not the needle but the part it seats into) has an o-ring where it mates to the carb body. If that o-ring is not tightly sealed it will allow fuel to bypass. I found o-rings very cheap at pep boys just take an old one with you to match for size. very cheap too. (under 5 dollars)
Posted on Sep 20, 2009
if you have idea for the removing carbs set, remove it from the block and dismantle all small parts, you can clean using gas, paint brass and pressurized air. for blowing small hole. be sure all kit to return back with no left behind.
Posted on Apr 13, 2010
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