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Discussion Starter · #1 ·
The carbs have started spitting back at low RPM's under load, and its getting progressively worse. I'm assuming a partly clogged pilot jet is to blame, but could there be other possibilities? The mixture screw is already 3 turns out.
 

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I wonder if your mixture screw is actually too far out, and that is the problem. I have been having a stumble at idle which is similar, and is a rich mixture screw I am sure.

You may need a 42 pilot and the mixture screws turned in maybe?

Althogh if this only just started - try putting your stock ignition box back on and see if that helps.
 

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The carbs have started spitting back at low RPM's under load, and its getting progressively worse. I'm assuming a partly clogged pilot jet is to blame, but could there be other possibilities? The mixture screw is already 3 turns out.
Certainly could be gummed up carbs but I would also look for air leaks on the intake side, particularly the vacume caps. Check that the aircleaner element is clean and clear.

On the ignition side it could be a faulty ignitor or ignition pickup (crank angle sensor).

Does your bike still have the air injection system fitted?
 

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Discussion Starter · #5 ·
Good answers! I will try the stock igniter, previously my first Procom had hot start issues. This one has been on for two years so I will try that first, then the vac ports etc before pulling the carbs.
 
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