1997 Vmax Xtc 600

L

laidt

New member
Joined
Jan 29, 2008
Messages
38
Age
47
Location
MN
1997 Yamaha XTC 600. Just changed out the oil pump, old one was faulty and failed wide open. Stupid me forgot to crack the bleeder and no oil was getting to the engine. The engine locked up after riding about 1/2 mile going no faster the 10 MPH. After about 5 minutes, I was able to move the engine freely. I now have addressed the oil pump issue but I am only getting a compression test of 90 PSI on each cylinder but holds steady. Sled seems to run fine at idle, haven't tried opening her up. Do I need to pull the motor apart? Looking for advice on what I should do now?
 
You probable hatched the motor, take the head off and take a look at the piston skirts and the cylinder walls. 90 psi is too low
 
Yep not good, your going to need to open it up and see how much damage
you did,drain the coolant pull the head and cyl's off, post up some good
pic's of everything and we can help ya out..don't run it anymore

welcome to the site........
 
That is not what I wanted to hear. No more running the sled and I will post some pics. Thanks for the welcome to the board.
 
Sorry to hear about the bad luck. I just changed out my oil pump too. I premixed the gas and ran it thru and watched to make sure oil was being used out of the tank. I never did bleed it but made sure both hoses had oil running out of them. Where is this bleeder screw at that you are referring to?
 
Ok, On the fiche it is called a Bolt/Breather. Quick thinking told me the bleeder should have been on the bottom but I guess it is lower than the tank. Thank you. I had to replace the pump on my twin btw. Runs much better with the right amount of oil too.
 
Are there any places on the board that gives detailed instructions on pulling the head and cylinders for a 600 Twin? How big of a job? Looking to get to Hurley Wisconsin Valentines Day weekend.
 
All you have to do is drain the coolant out of the motor from the drain bolt on the front of the motor (if you're the type that doesn't mind a engine bay full of antifreeze, you can just skip that step and just take the head off and it will pour out.) It's not a big job at all if you're mechanical. loosen all the nuts on the head and pull it off, same goes with the cylinders, look at what you got and post us some pice, we'll walk you right through it. Where in MN are you??
 
I am in Ramsey Mn, I will pull it apart tonight and I will get some pics posted ASAP. Thanks for the help.
 
Any particular pictures that are crucial, walls, rings, pistons, head?
 
I'm in northern MN, if you were closer i could help you with the job. As far as pictures go... Pistons and cylinder walls should be plenty. What you're probably going to find is a couple of scored and galled up pistons, hopefully that will be it. How long and at what rpms were you running it at when it locked up on you??
 
Sorry i see that you were just idling along when it locked up. At that low of rpm you'll PROBABLY be able to get by with just a couple new pistons and just a hone job on the jugs. Now I said PROBABLY not for sure!!!!! in MOST cases a low temp burn down doesn't do TOO much damage. But you'll find out after you get it apart!
 
Where does a guy get some pistons, rings, and a hone job? The local dealer?
 
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