Carb Indentification?

oscar89 · Post by **oscar89** » Thu Feb 05, 2009 3:47 pm

Ok I see the VM Mikuni manual breaks down various engine tests that tell whether the jets are sized properly & the air screw is set correctly. Since this is a non-OEM carb the John Deere service manual settings may not be right.

pj sportfire · Post by **pj sportfire** » Thu Feb 05, 2009 3:50 pm

I know that, but they're right now.... I just give the engine what it wants...easy.

pj

oscar89 · Post by **oscar89** » Thu Feb 05, 2009 4:48 pm

Yep just figuring it out for myself. Gotta a wicked exhaust backfire yesterday from the fuel that was pooled in the exhaust, blew the snow & sawdust back off the garage floor a long ways. Hope that taking the jet needle up a notch will stop that.

oscar89 · Post by **oscar89** » Thu Feb 05, 2009 5:44 pm

Pj was there a plastic washer under the E-ring?

pj sportfire · Post by **pj sportfire** » Thu Feb 05, 2009 5:59 pm

oscar89 · Post by **oscar89** » Thu Feb 05, 2009 6:01 pm

Crap I must have lost it.

oscar89 · Post by **oscar89** » Thu Feb 05, 2009 6:02 pm

Their isn't 1 pictured in the manual diagram so perhaps the newest carbs don't got.

JDT · Post by **JDT** » Fri Feb 06, 2009 12:08 am

The washer was used like a half notch position. Some have them and some don't.

If for example you think 2 is almost right and 3 is just a little two much put in the washer.

oscar89 · Post by **oscar89** » Fri Feb 06, 2009 1:17 am

Ya had to set jet needle back to 1st notch to get the SF to quit smogging the entire neighborhood. Now I gotta figure out why the lights aren't working.

oscar89 · Post by **oscar89** » Wed Feb 11, 2009 6:31 pm

My carb mounts in such way that it is pointing up from the intake at perhaps +20 degrees. In other words the carb isn't mounted flat w/ the snowmobile. Everytime I take the carb off there is a pool of fuel in the rubber intake mount. Also fuel runs out the pilot hole of carb outlet when I hold the carb in the same position its mounted. I set up the fuel shutoff to the same level the SF manual indicated. Is the carb suppose to mount pointing up?
John

oscar89 · Post by **oscar89** » Wed Feb 11, 2009 9:53 pm

The bowl is overfilling & flooding out the engine, but why. Having taken the carb apart everything is as specified by the Mikuni manual & the float needle is shutting off properly.

oscar89 · Post by **oscar89** » Fri Feb 13, 2009 5:39 pm

Ok just contacted a Mikuni dealer & he said these carbs are designed to be mounted horizontally & when mounting off-horizontal the tab on the float mechanism has to be adjusted downward. The problems of going non-OEM.
Would think the engine would be flooded out on a downhill run even w/ a horizontal mounting.