• We have updated the site to the latest version. You will be required to log in to make sure your account is active. There are quite a few new functions so it will take a little time to get use to it. Please post if you see or have any issues.

HELP with carbs on 98 xc 600

M

monte44

New Member
Messages
14
Age
46
Location
Minnesota
Country
USA
Years Snowmobiling
30
Snowmobile
1995 indy sport, 1996 indy lite
Need some help on carbs on a father/son 98 xc 600 project. We have re-rung and replaced crank seals has good compression and passes a leak down. we have installed new Vforce reeds. Problem we are having is poor idle seems like it's loading up will barely idle. It currently has 185 mains and 40 pilots 1 turn out on the screws I have vacuum tested the needles and both hold. The float pins have been JB welded. I do know that these can be very fussy to tune and sure hear and read a lot of problems with the keihin carbs. I have the Polaris throttle adjusting tools. There seems to be a lot of fuel spray in the air box but when I use the choke it does not seem to effect its running? Hope that makes sense. ANY HELP WOULD BE GREAT. THANKS
 
Keep in mind the screw is an air screw on the Keihins, completely opposite of the fuel screw on Mikunis. Sounds like it needs more air. The vforces tend to run a little wonky at idle until they have a chance to break in too.
My buddy has had one of those sleds since it was brand new, it was always a miserable running machine until it got warmed up. I dont think those had tstats in the cooling system which makes it much worse to heat up.
 
Last edited:
So should I should I try 1.5 turns out? My other option is I have a se of mikuni flat slides with cables of 2001 rmk 600. I read a few articles where those must really help with the bottom stumble? THANKS for the help.
 
Yeah, i thought I remember my 00 700 being closer to 2 turns. The reeds should help clean up the low end stumble as well, I never put them in the 700 because they were problematic with failures back when i was playing with tuning that sled.
I've seen alot of talk on the mikuni conversion as well, my only concern would be was the 01 still a big block 600? they went to a smaller block architecture with the VES motors, so that would likely affect all the jetting. 00 was the beginning conversion year for the VES 600s so not sure when the RMKs got the small block.
 
You must log in or register to reply here.


Back
Top Bottom