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vm26 idle mixture screw setting?

  • Thread starter Thread starter paulkdx220
  • Start date Start date
P

paulkdx220

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i made the error of not counting the turns upon disassembly for cleaning. i know now the these were factory set.

should i treat them as i would normally on other carbs by turning them in/out for highest idle speed?

p
 
You don't say the bike but if you are talking about the airscews (on the side) then 2 turns out will get the thing to work, Fine tune from there as you describe.

If it's the fuel screws (underneath) then 3/4 turn gets you ballpark.
 
What HH is referring to is that you have two sets of adjustable screws

The air screws are on the side of the carb

The fuel screws are underneath, towards the front, under that cap you have to remove

So, I'm assuming you didn't find the fuel screws as yet?
 
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The baseline settings for the VM screws are approx 1 turn out from gently seated for the fuel screw and 2 turns out for the air screw. If you change the fuel screw setting (e.g., 3/4 turn or 1.25 turn), you should start the air screw at 2x turns.

In any event, you then use the highest idle method to fine tune the air screw.
 
The fuel screw seems to make more difference than the air screw, I like to go as far in (lean) with each pilot fuel screw as possible without losing any off idle throttle response. Then fine tune the airscrews with the highest idle method. Works well for me.
 
tkent02 said:
The fuel screw seems to make more difference than the air screw, I like to go as far in (lean) with each pilot fuel screw as possible without losing any off idle throttle response. Then fine tune the airscrews with the highest idle method. Works well for me.
Click to expand...

I'd try this, but adjusting the fuel screws on the bike is a PITA. Might try your flathead bit in the 1/4" socket approach though.
 
and an old lisence plate works wonders to keep from burning your hands on a warm engine. if your doing plug chops, that is.
 
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