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Only getting about 30 mpg.

  • Thread starter Thread starter Icculus88
  • Start date Start date
Icculus88 said:
Ya I dipped each carb for 24hrs in Berrymans(sp) and got all the orings from the oring guy. I'd rather not take my carbs off until I have to. They have been on/off the bike countless times
Click to expand...

One more time won't hurt to find out what the fuel jets are and you need to jack your mains up to at least 117.5 anyway.
 
Toasty, I kind of don't know what I'm doing with the screws. I don't know if in or out is more or less mixture.
 
I was told changing the jets on the VM carbs for pods isn't as necessary as the CV
 
I'm a newb so can you quickly explain how larger jet will help with being rich?
 
Icculus88 said:
I'm a newb so can you quickly explain how larger jet will help with being rich?
Click to expand...

Your plugs are black because it's the fuel jet which affects them most when you idle and cut then engine.
The richness is due to the fuel jet being either too large or wound OUT too far.

The fuel jet is used for approximately the third of throttle. The needle jet is responsible for the second third and the main jet for the final third. There is some overlap between them. Of course the size of the main comes into play with the needle jet.

With a main jet of 105 with your set up I would guess if you ran at high rpm for a while and cut the engine you'd find your plugs pretty much white - running too lean. Blueing pipes is an indication.

This is very bad as it will eventually result overheating and burning your valves.
 
Ok so my next will be to check needle jet and put in some 117.5s mains. And throw in new plugs and see if there is a change in startup and idle. That sound like a smart move?
 
screw like this

screw like this

Icculus88 said:
Toasty, I kind of don't know what I'm doing with the screws. I don't know if in or out is more or less mixture.
Click to expand...

Fuel screw is under each carb, turning the screw out will let more fuel in (richer) and vice versa.

Air screw is on the side of each carb, turning the screw out will let more air in (leaner) and vice versa.

You can easily get to the air screws with the carbs on the bike. You can also adjust the fuel screws with the carbs on the bike, #1 and #4 are easy, #2 and #3 a little more difficult. You'll need a 3 or 4 inch screwdriver to get to the fuel screw if you leave the carbs on the bike. (screw tip fitted into a socket will work)
 
Icculus88 said:
Gs850cafe, I se you live in Salem, I live in St. Louis. Do you take rides in MO?
Click to expand...


yea just localy...i was at ride of the century this year...send me a pm if your ever down this way...i live in rolla now..im gonna update that
 
Icculus88 said:
Ok so my next will be to check needle jet and put in some 117.5s mains. And throw in new plugs and see if there is a change in startup and idle. That sound like a smart move?
Click to expand...

Check the fuel jet, not the needle. If it's 15 it's stock and just needs adjusting. If it's anything else you'll need to put 15's in there. And while you're there put in the 117.5 mains.

You probably don't want to hear this but the e-clips on the needle jet should be dropped to position four, counting from the top down.
 
allojohn said:
Check the fuel jet, not the needle. If it's 15 it's stock and just needs adjusting. If it's anything else you'll need to put 15's in there. And while you're there put in the 117.5 mains.

You probably don't want to hear this but the e-clips on the needle jet should be dropped to position four, counting from the top down.
Click to expand...

Icculus88,
fuel jet = pilot jet

The pilot jet, fuel screw, and air screw are your main players for the pilot circuit of the carb, the pilot circuit of the carb is for idle to 1/4ish throttle. (see earlier allojohn post)
 
Last edited:
Ok so the pilot jet=fuel jet=bleeder. I am looking at the VM rebuild PDF of basscliff's site. Must the carbs be removed for this?
 
Icculus88 said:
Ok so the pilot jet=fuel jet=bleeder. I am looking at the VM rebuild PDF of basscliff's site. Must the carbs be removed for this?
Click to expand...

Only a nut-job would try to change the fuel jets and main jets without taking the carbs off. Are you a nut-job?
 
allojohn said:
Only a nut-job would try to change the fuel jets and main jets without taking the carbs off. Are you a nut-job?
Click to expand...

Changing jets on the bike is easy. Cleaning the carbs properly so they might have a chance of working correctly is not.
 
Icculus88 said:
Ok so the pilot jet=fuel jet=bleeder.
Click to expand...

No it's a pilot jet. The other terms are meaningless. There are also pilot fuel screws and air screws. Learn what they do, it's only possible to tune it correctly if you know how it works.
 
I can't say for sure I'm not a nutjob. :) . But I'll take carbs off and get at this when I can. Thanks for the help! Much appreciated.
 
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