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FJowners.com > General Category > Yamaha FJ1100 / FJ1200 Running Problems > Bike running lean on low revs & load
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Author Topic: Bike running lean on low revs & load  (Read 933 times)
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ENGINEERLARS
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Bike running lean on low revs & load
« on: August 18, 2019, 12:03:17 PM »

Hi
Got a problem, bike (FJ110) is running lean whatever I do. What can be the problem?
I have:
- right jets (pilot 40, main jet 115) FJ110 E47
- cleaned the carbs thoroughly (including small channels) with special attention on pilot jets
- new inlet rubber = no air leak
- running with original filter box and new air filter
- trying to adjust pilot screw with help of Carbotune and can’t get flame to turn yellow
- tried to run with pilot screw open 3.0, 3.5, 4.0, 4.5 and some setting in between
- synchronized carbs thoroughly
- plugs really white

Bike is running good on throttle more than 25% but shitty on low revs and loads (sitting still and only revving motor sound good).     

Is there any good ideas what might be my problems?

Grateful for any suggestions
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Bike running lean on low revs & load
« on: August 18, 2019, 12:03:17 PM »

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racerrad8
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Re: Bike running lean on low revs & load
« Reply #1 on: August 18, 2019, 05:07:52 PM »

air bleed size?
flat or curved slides?
main jet needle?
Slides drilled?
Stock Slide Springs?

Since the mixture is not changing that indicates the idle circuit is plugged/restricted.

But, the above questions also play into the equation.

Randy - RPM
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Randy - RPM
ENGINEERLARS
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Re: Bike running lean on low revs & load
« Reply #2 on: August 21, 2019, 12:10:17 AM »

Hi Randy
Thanks for the advice, I will go over the pilot circuit once more to see if i can mitigate the problem.
BR
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roverfj1200
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Re: Bike running lean on low revs & load
« Reply #3 on: August 21, 2019, 02:22:29 AM »

Sounds like a weak fuel pump..
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1988 FJ1200
1991 FJ1200

Richard.
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