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Mixture Setting

  • Thread starter Thread starter ned-999
  • Start date Start date
Ned,

You definitely need to dip those carbs again, 24 hrs each min. Then blow them all out. While they are soaking inspect your valve clearances and reshim if necessary. Empty out your gas tank, buy some BB's and pour them in the tank, fill 1/4 with hot soapy water, cap on and shake the heck out of it. if your seeing some rust come out, then you may need to seal the tank. Jetting the carbs is a must for any modifications to the stock exhaust and intake.
 
ned-999 said:
Well I have noticed that the inlet rubbers actually flex when the engine is running which did surprise me because i didn't think there was that much vacuum ! You can see them pulsating quite a lot in rhythm with the engine. Is that normal ??
Click to expand...
Definitely try removing the air filters and see if that keeps the plugs from fouling. Those rubber intake manifolds should be pretty stiff when the carbs are inserted, although the rubber is not super thick.

Agree with mvalenti and others who recommend another cleaning of the carbs (but dirty carbs with plugged jets lead to LEAN condition, and plugs don't foul when the mixture is lean).

Also, recommend you install some type of strap to support the weight of your carbs since the airbox has been removed. I used a heavy weight zip tie to hold the carbs up. It's barely noticeable.
 
AJ said:
Definitely try removing the air filters and see if that keeps the plugs from fouling. Those rubber intake manifolds should be pretty stiff when the carbs are inserted, although the rubber is not super thick.

Agree with mvalenti and others who recommend another cleaning of the carbs (but dirty carbs with plugged jets lead to LEAN condition, and plugs don't foul when the mixture is lean).

Also, recommend you install some type of strap to support the weight of your carbs since the airbox has been removed. I used a heavy weight zip tie to hold the carbs up. It's barely noticeable.
Click to expand...

Will do the cleaning. Ive got a bespoke threaded rod that screws to the frame from the carb rail so its pretty rigid. The air filters do look like they are restricting the air intake if they are noticeably deforming on every intake stroke. Il take them off and see if they still do !!
 
You should see/feel an intake pulse on the carb mounts when running, normal for a 16 valve motor.
V
 
Hi ive taken them all apart and cleaned them out ..... Just on thing puzzling me. Ive been searching the forum for info on jet sizes which I have found. So the stock jet is 112.5 and the jet I have in is 147.5 which I think is way too big as follows.

Exhaust: +4 main jet sizes for no muffler (open headers)

Intake: K&N Pod Filters = +4 sizes Main Fuel Jet

Equals: +8 main fuel jet sizes above baseline Subtract: -2 main fuel jet size per formula

Equals: +6 main fuel jet sizes due to modifications. Well what is 6 sizes up on jet sizes ???? I recon its 130 can anyone confirm that for me please.

Thanks
 
Well they are all back together with 130 jets. I've yet to take it our but it's now backfiring on one cylinder. All I've done is clean out the carbs and put in smaller jets. Are the jets too small now.
 
ned-999 said:
So the stock jet is 112.5 ... Well what is 6 sizes up on jet sizes ???? I recon its 130 can anyone confirm that for me please.

Thanks
Click to expand...
Six sizes up from 112.5 would be 127.5.



ned-999 said:
Well they are all back together with 130 jets. I've yet to take it our but it's now backfiring on one cylinder. All I've done is clean out the carbs and put in smaller jets. Are the jets too small now.
Click to expand...
What are your spark plugs telling you?
icon_shrug.gif


I can't see your plugs from here, and you are thankfully out of earshot, so you will have to rely on the appearance of your sparkplugs.

.
 
Think I've found the problem that is contributing. Very weak spark and when you turn the ignition on all four plugs spark, and I got a shock from the key. The coils must be earthing somewhere. At least I have something concrete to work on.
 
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