I just bought a 99 XC 600 and can't get the darn thing to run right.
If I open it up all at once it just surgers. To get it to go smooth at all
I have to feather the gas And then it usually takes right off. It also seems to run pretty bad coming out of corners and after slowing down and such. If I run
it wide open as in on a long strait stretch it runs fine for a couple of seconds
then drops to about 7000 rpms and starts to die out. The first thing I am going
to change is the fuel filter.
It does have a PSI single pipe. I checked the jetting and there was a 195 on the left side and a 200 on the right. Wondering why they would be different?
He gave me the the stock jets also which are 170's. I want to try the stock jets
but don't want to risk leaning out the engine too much. I spend most of my time at about 1000 feet above sea level. I am hoping to make it to Northern WI Sunday and need to get this thing sorted out.
Any ideas would be much appreciated!

Hey if your sled is dropping to 7000rpm this is way to low. It could be your primary or seconday clutch that needs some work. Have they been looked at since you bought it and how many miles on the sled????? My 99-600 is stock and i have 8000 miles on it and runs top notch....hopefully it is a quick fix but i would have to look at the clutching.....cya

The reason why one side is richer then the other is because one side runs hotter then the other. Check you fuel flow and check the carbs for debris and or water droplets in them. Also find a dealer to check the syncronizing of the carbs. It takes a special tool to get them done correctly. Also take the reeds out and check for broken petals or cracked petals and do a compression check. How is the jetting? How do the plugs read? are they White, Tan, dark brown or black? Make sure the choke cable is not hanging up and that the primer is not letting too much fuel in. Another thing is the airbox. Make sure nothing is in there that shouldn't be and that the stock foam is in good shape and not all plugged up.

Go through the clutches to make sure everything is operating smoothly and clean. check for broken springs etc. Also check the motor mounts to make sure they are in good shape and that the motor mount plate on the bottom of the motor is not cracked or broken and make sure the snubber just below the secondary clutch is adjusted so it is snug against the motor block.

Thanks for the responces! I changed the fuel filter and that took care of about half my problems. I am told the clutching is stock. Not sure how well the PSI pipe well work without clutching. I am going to post in the clutch section but does anyone have any recogmendations for this setup? I well need to be spoon fed as I know very little about working on clutches.
As far as how the sled runs. It acts like it's fauling a plug and then at no particular
rpm it takes off like a rocket. Sometimes I have to feather the gas and sometimes I just have to hold it open. When I put a fresh set of plugs in and run it hard and then shot it down the plugs look almost ideal. I did a compression check and have 106lbs on each side. There is about 5000 miles on it.
It has been very warm with my trials and errors, 30's and 40's. I was told by the seller that the sled was perfect back when it was cold a few weeks back.
Again, all input appreciated!

Originally posted by cvayer@Mar 6 2004, 02:38 AM
Not sure how well the PSI pipe well work without clutching.
.
Allso check ign,plugg "cap"/ conectors (I don know the right name, the thing with the ign.wire that you poch on top of the spark plug)
just my 2$
Lars
I ones bought used PSI- twinpipes, phoned PSI and got conected to a GIRL / WOMMAN that just read me the info needed (jetts and clutch)...
Thats good service, isn't it ! :inlove:
Trye them (the PSI people) out.... I'l bet you be happy to !!!
Lars