carbs - Snowmobile Forum: Your #1 Snowmobile Forum

TFWildman · 12-29-2012, 03:29 PM

I know there must be a hundred of these but will someone tell me the baseline for turns on mikunii carbs 38mm theyre on a 91 el tigre ext thank you for your time

COOKSTER · 12-29-2012, 05:00 PM

Assuming you mean the pilot screws, the 38s on my 98 ZL500 are set at 1 turn out from lightly seated. Totally different motor though.
Just curious, why are you needing to adjust them?

TFWildman · 12-29-2012, 05:13 PM

it's idling a little funny and everything is all clean I just figured id get a baseline to adjust from. and I think it is one turn but im unsure about the idle screw. do you happened to know where I can download a free manual for it?

1on3off · 12-29-2012, 05:15 PM

You can purchase a complete service manual for around 10 bucks online. Worth it if you are going to be doing all your own repairs.

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**smallengineguy** · 12-29-2012, 05:16 PM

Baseline is one turn out from lightly seated. Adjust your idle so it's around 1800 RPM.

TFWildman · 12-29-2012, 05:34 PM

How many turns would 1800 rpms on the idle be roughly cause there are two carbs so I want them the same ya know

**kccats** · 12-30-2012, 06:01 AM

There is a great section here called the How too!
You need to clean the carbs first and the pilot jet (up the tube)
Then stc them!
Start with the carbs off and hold the throtle wide open and adjust the cable tension (on top ) till the slide is flush with the top of the throat.
Then with an 1/8" drill bit losen or tighten the idle screw until there is just a little drag on the bit. OK now start the sled and if idle is too high or low you can raise or lower each the same number of turns!
Now get the idle as low as possible, then turn Out the idle mixtur screw (the little one!) utill the rpm is as high as possible, now turn the idle to where you want it!

TFWildman · 12-30-2012, 12:56 PM

Thank kccats