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Bike runs way rich after K&L carb kits

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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Hi All

I decided to strip the carbs on my GS1000G as cylinder 2 wouldn't fire at low revs, I suspected a blocked pilot circuit.

Before the strip I'd already set the low running mixture on cylinders 1,3 & 4 using a colortune. After doing this the pilot mixture screws were all around 1 1/2 turns out.

On stripping the carbs I found the usual gunge and the pilot jet on cylinder 2 was completely plugged. Unfortunately two of the pilot jets had to be drilled out. So I bought 4 K&L carb kits and decided to change all the jets as a matter of course together with the pilot screws and a set of o-rings from Robert Barr.

Mine is a UK spec bike with 115 mains, 40 pilot jets, and 160 pilot air jets. The kits contained 115 mains, unmarked pilot jets and 200 pilot air jets. So I decided to fit the new mains and pilot jets and stick with the old pilot air jets.

After the rebuild it runs on all 4 but it is hellish rich, I couldn't get the mixture weak enough with the colortune even with the pilot screws fully home. I tried running without the airbox and I got the 'ideal' mixture at a pilot screw setting of around 1/4 turn out. I decided to fit the 200 pilot air jets and this helped a bit but with the airbox fitted I'm still too rich on 2 cylinders even with the pilot screws all the way in.

I'm assuming that the K&L pilot jets are wrong, or the mains, or both, or maybe the K&L pilot screws aren't seating properly. Incidentally I didn't change the float heights, float needles or float needle seats, save for new o-rings. I also fitted new carb plugs above the pilot jets.

Has anyone else had this sort of problem with a pattern carb kit?

Does the main jet affect pilot mixture?

Any help would be Much appreciated.

Thanks
 
The OEM jets are best! the generic repair kits are sometime suspect
 
If you stick with that kit your gonna have to go to pod filters to get enough air thru to lean it out.the stock air box is too restrictive for the setup
 
yeah thats right if you richened the carbs u need to run to pods not only to make up for the added fuel so it will run but to get the power you intended to get
 
You mean THROW them away...........I would just try individual air filters mounted on each carb, like K@N filters. Since the carb relys on vacuum to bring the fuel up, a more flowing filter will cause less vacuum then before... and since you have changed your jetting you wont have problems running too lean.
 
YES either use the original jets or get some Muniki jets Otherwise you could have a tuning nighmare you will never fix
 
SqDancerLynn1 said:
YES either use the original jets or get some Muniki jets Otherwise you could have a tuning nighmare you will never fix
Click to expand...

I guess I should have learned my lesson by now. Trying to save a little cash at the beginning costs more in the end :?
 
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