Mikuni Carb Setup

[KORE]

Hey guys i just thought i would ask if any of you have a standard set up procedure for these round slides. Im getting a high rev and ive backed out the slide screw. Starting from scratch after a carb rebuild what would you do?
Thanks

 

[polarice]

does your slides move freely
and no air leaks

 

[KORE]

does your slides move freely
and no air leaks

yeah the carbs are in great shape im just settin up from rebuild

 

[retiredpop]

Try this procedure. It is for a triple carb setup but will work fine for 2 also. View attachment Carb synchronizing.txt

View attachment Choke adjustment .txt

 

[gr8tdragon]

Try this link. It will help you alot. I would also say it is probably your pilot air screw is in too much.

http://www.mikuni.com/pdf/vmmanual.pdf

 

[heikki]

Hey guys i just thought i would ask if any of you have a standard set up procedure for these round slides. Im getting a high rev and ive backed out the slide screw. Starting from scratch after a carb rebuild what would you do?
Thanks

base your pilot screws to 1 1/2 turns....only if you removed them and dont know where they should be....still high ???

intake air leak...or crank seal......did you get into the carbs for this reason high idle......??

air leaks can be chased down with brake cleen or carb cleaner spray

 

[KORE]

Perfect. Thought I would quickly get an answer

 

[KORE]

Ok. So why do the revs take so long to come back to idle?

 

[switchbackfst]

If you wack the throttle and it stays idled up for a minute....then flattens out, you are still a bit lean. What are these carbs on? Is the pilot screw on the airbox end or on the engine side of the carb??

 

[s/b tech]

Slide heights may still be a little high on one or both carbs.

 

[KORE]

670 motor. Air screw in will bring more or less......fuel or air?
Here's the set up. 16th of an inch under slides. Idle screw out 5 turns and air screw out 1 high revs hanging on after throttle blip?

 

[s/b tech]

Pilot screws adjust the amount of air drawn into the pilot circuit. The more they are turned in, the richer the fuel mixture. Wht is the rpm that the machine idles at after it settles down?

 

[switchbackfst]

for starters depends where screw is if by the airbox, out=air. But if it is on engine side, out=fuel. when the slides come down do they hit the idle screw?

 

[s/b tech]

The pilot screws on the 670 motor are ahead of the slides which mean they are adjusting the the amount of air. Turned in means more fuel, turned out means more air.

 

[KORE]

Idles at 2000. Screws are on the mag side, intake half of the carb. The slides come down to the screw.

 

[s/b tech]

Your adjustments are prob very close. Try adjusting the slide height down a bit and see if it changes the result.

 

[s/b tech]

the thumbwheel screws on the side of the carbs adjust the slide heights. Should be idling between 1600-1800 rpm.

 

[KORE]

K thanks guys thinkin I'll dial in the idle to lift the slide and fine tune with the pilot.

 

[s/b tech]

All the best!:d