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  #1  
Old 14th July 2020
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mikaelson mikaelson is offline
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Default Can’t go over 70mph

Hello,

I’m having trouble getting my sporty 883 1994 over 70 mph.
I have installed single fire pickup and coil, both from Dynatek. I run original pipes with ”straight mufflers”. (Basically straight pipes...).
The bike is pretty responsive and runs extremely well otherwise, I have no problem getting up to 70mph, but trouble getting over it. I have checked compression and I have about 150 psi on both cylinders. I only run highest quality fuel. I was thinking it may be a vacuum problem in the tank?
But my spark plugs are not indicating getting too little fuel. The front cylinder seems to run rich and the rear pretty perfect, maybe a tad too rich...
Anyone got any good advice on how to localize or fix this problem?
It seems as the problem is only visible at high RPM. (Maybe a poorly jetted carb?)

I’ve added a picture that shows a pretty accurate representation of my plugs.

Thanks.

https://ibb.co/Ns3NLgf
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  #2  
Old 14th July 2020
denguy denguy is offline
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Fuel filter?
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  #3  
Old 14th July 2020
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Default

Quote:
Originally Posted by mikaelson View Post
Hello,

I’ve added a picture that shows a pretty accurate representation of my plugs.

Thanks.

https://ibb.co/Ns3NLgf


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  #4  
Old 14th July 2020
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Default

You can try following some of the suggestions in this thread:
http://xlforum.net/forums/showthread.php?t=2076330

BTW - It's not a VOES issue...


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  #5  
Old 14th July 2020
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Throttle cable to carb adjusted correctly so that the butterfly will open fully?
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  #6  
Old 14th July 2020
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That's definitely a good check
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  #7  
Old 14th July 2020
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Slipping clutch?
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  #8  
Old 15th July 2020
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What are your top rpm's?
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Old 15th July 2020
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Quote:
Originally Posted by Highly-Dangerous View Post


Alcohol blended fuels negate this.
It really has made plug reading challenging by former fuel information.

Actual plug pics would help.
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  #10  
Old 15th July 2020
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Default

Quote:
Originally Posted by mikaelson View Post
Hello,

I’m having trouble getting my sporty 883 1994 over 70 mph.
I have installed single fire pickup and coil, both from Dynatek. I run original pipes with ”straight mufflers”. (Basically straight pipes...).
The bike is pretty responsive and runs extremely well otherwise, I have no problem getting up to 70mph, but trouble getting over it. I have checked compression and I have about 150 psi on both cylinders. I only run highest quality fuel. I was thinking it may be a vacuum problem in the tank?
But my spark plugs are not indicating getting too little fuel. The front cylinder seems to run rich and the rear pretty perfect, maybe a tad too rich...
Anyone got any good advice on how to localize or fix this problem?
It seems as the problem is only visible at high RPM. (Maybe a poorly jetted carb?)

I’ve added a picture that shows a pretty accurate representation of my plugs.

Thanks.

https://ibb.co/Ns3NLgf
What RPM at 70 MPH?
Can you exceed that RPM in fourth gear? climbing a grade?
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