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  1. #1

    Help with XLT1200 timing issue

    I've got a 2001 XLT1200. When I bought it the prior owner had water in the motor. It started and ran but crank bearings were noisy. Anyway I bought a used bottom end (crankcase and crankshaft) off eBay from a 2001 GP1200R and installed it using my old pistons that were still fine (115 psi each). Now it wants to backfire through the carbs and will not start. I am stumped at what the problem could be. It seems to be out of time. The guy I got the bottom end from said it was pulled form a running ski and my machine started fine before this. Any ideas?


  2. #2
    steve45's Avatar
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    Flooded? Bad reeds? Sheared flywheel key?

  3. #3
    Yeah, I was thinking sheared flywheel key too, but the guy I got the crank from (flywheel was on it when I got it) said he pulled it out of a running ski. The reeds looked good when I put it together.

  4. #4
    steve45's Avatar
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    Could just be flooded. I had one backfire out the carbs when the choke cable stuck on. Knob was off, but the choke remained on. It apparently shattered the front seal when it did it.

  5. #5
    Hurricane1000's Avatar
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    Quote Originally Posted by steve45 View Post
    Could just be flooded. I had one backfire out the carbs when the choke cable stuck on. Knob was off, but the choke remained on. It apparently shattered the front seal when it did it.
    Check for excess water in the fuel.....it will make it backfire through the carburetor too!

  6. #6
    I found the problem today when I pulled the motor to see if the flywheel key was sheared. It's pretty upsetting. I bought the crankshaft/crankcase assembly off ebay. I did not flip it over and see that the seller had removed ALL the bolts holding the top and bottom case together. It's partially my fault for not turning it over before installing it, but who would expect $5 worth of bolts to be removed from a $500 part. Especially when it came with the starter and driveshaft coupler. Anyway now I hope that nothin got damaged since it did backfire a few times with only the stator cover and weight of the engine holding the thing together.

  7. #7
    steve45's Avatar
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    Some people shouldn't be allowed to own tools.

  8. #8
    dockwalker's Avatar
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    Ain't gonna be $5 to replace those bolts.Make sure you pressure test.

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