yamahaulinass
New member
i have a 94 vmax 600. and i bought it from a freind and when he had it. when i got it on that same day i took it to a dealer and had it gone throw ($200 worth) it has a speical clutch(so he said) but after i go ti back and started riding it dont have any power 60mph max. when you stop and gun it it dont really spin the track. i took it back and they couldent find anything wrong with it. 
has anyone had this prob or any sugestion. PS a guy told me to check clutches for grooves or broken springs but there isent!! 
Pluged pipe? clutch offset and center to center? worn belt? Loose motor mount? Clean carbs? tight track? ect, ect, ect,
wayneswrld
New member
I have a 97 vmax 600. working on the same problem. had it at three shops in new york. I have had so much clutch work and carb cleaning they shine like chrome. the last shop rebuilt the top end of the motor. But the best gas milage was still 6 mpg. Since this is the only Yamaha I own. I have to compare the engine sound to my skidoo. the skidoo has a like zing,zing zing sound fron partial throttle on up. The yamaha sounds more like a NASCAR. No Zing until wide open throttle. I did the head gasket modification. And I am adjusting the carbs. I have the pilot jet screw set at 3/4 turn out and the needle jet clip set in the top grove with the washers on top of the clip. It sounds so much better. But how can I be so far off of what the factory specs are? I have to believe the main jet is correct because of how it runs and the plugs look after a wide open run. Note: The engine held together with the gasket mod and 3/4 pilot screw setting needle jet at jn:1 with 87 octane gas. (only gas available at the time)
daman
New member
wayneswrld said:
Thats what you need to do is get in there and put your settings back to
stock.
6 mpg is just crazy,,i can do better than that with a hole in my tank.
My XTC gets 12-14mpg....
click on the link;
stock carb settings
http://www.totallyamaha.com/snowmobiles/AAATuning Chart/Specs.htm
daman
New member
yamahaulinass said:
Thats crazy,,when hooked up it should lift the skis and rip a 100mph easy..
something is definitly wrong there..
Sounds like clutching problems to me,,you need somebody that knows
what he's doing to look at it..is the motor stock????
yamahaulinass
New member
yes it all stock but no power it like camparind a geo to a 455 musle car<< what it was at begining) i dont know what to do.
daman
New member
yamahaulinass said:
Does it have the stock Yammie clutch on it??
cougar1985
New member
had a similar problem with my vmax. no guts,i checked everything.i mean everything. well to make a long story short it was the coil ,it was failing under load. went to the dealer got a new one and preto! i got my sled back to full song again!. factory setting on the air screw is 1 1/8 out from lightly seated.i think rpm at idle is 1575. 
Busted Max
New member
cougar1985 said:had a similar problem with my vmax. no guts,i checked everything.i mean everything. well to make a long story short it was the coil ,it was failing under load. went to the dealer got a new one and preto! i got my sled back to full song again!. factory setting on the air screw is 1 1/8 out from lightly seated.i think rpm at idle is 1575.
true that!
also check your compression.. one cylinder may be low. my old sled wouldnt go over 80 and found a bad piston with a broken ring.