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Hi everyone.



I am struggling to get my rebuilt motor running well. It's definitely very rich. All usual things are checked and checked again such as valve and ign timing. Have good comp too. All ignition parts checked and OK. So it has to be fuel. I've rebuilt the carbs to almost lab standards inc float heights and balanced them, however I used a non OEM carb kit. Could this be the reason (such as leaky float seal? by the way, if youreally gently put the valve into the seat and blow down the fuel inlet, it seems sealed very well). I'm looking at OEM carb parts but they are ahorrendous price in the UK. I've also replaced the plenum seal with an OEM part, but not the square section O rings.

I'm wondering how the carbs deal with excess fuel from the pump - where is the return? Has anyone ever heard of a fuel pump over pressuring? I have no pressure gauge for fuel to check. I took the carbs off again last night and where the inlet valves are closed, there is a small amount of standing fuel, making me think all too rich. It also runs with blue / whitish smoke and sooty plugs.



At my limits of frustration here so any help is appreciated!



Thanks and safe riding



Mark
 

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Set up your carbs on the bench, take the caps off, level them, hook up a fuel source, high, the higher the better. Watch in the throats and in the plenum..you can see if fuel is leaking..up the jets = bad float settings, float seat or needles, down the throat = bad o ring to plenum, up the plenum main split = bad main gasket. Mine set up is not high but it still works but does not simulate the fuel pump pressure close enough; higher. bigger fuel source will.
 

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Could be the float, and is why Randakk and others recommend OEM floats. Other things could be carb-to-plenum O-rings and plenum half seal. Take the air cleaner cover off and look into the plenum. If there's any wetness in the plenum, you'll have to find out why. Some say having floats too high could cause fuel to get in the plenum, but the way they sit, I think they would go down the runners before getting into the plenum. It's likely one of the seals that are not replaced in an average rebuild. Randakk has an agreement with Wingovations in the UK now. He has what you need.
 

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Non OEM float valves are well known for not sealing properly. I went through the exact same thing. Replaced the float valves with OEM and solved the problem. Be very cautious of a hydro lock condition. The excess fuel may be getting into the combustion chamber.
 

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Discussion Starter · #5 ·
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Many thanks to all who are helping me. I have ordered OEM parts for all carbs at a ridiculous price so we'll see.





Ride safe



Regards



Mark
 

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How exactly are you setting the float levels, the center spring loaded plunger is not depressed for a correct adjustment. And did you do a side by side comparison of float valves for correct length, original vs replacements.

JD
 

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Discussion Starter · #7 ·
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Hi, thanks for reply.

I checked the heights as per Randakks instructions. I had to set them to a different height to the originals, but I have to say I didn't do a side by side comparison. I've bitten the bullet and ordered all OEM internals now so I live in hope until they arrive!!

Best Regards

mark
 
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