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i have 06 450 with 4 speed gearbox and have had no problems, its abit of a pain only haveing 4 gears cuz 1st is abit tall and 4th tops out at 120kph but its a great bit, just need to ride it hard and torque it as it loves to pull, a positive is u dont have to change gears as often ;)
Chances are you need to do a complete tune up. This means a new spark plug, cleaning the carb, new air filter and new piston rings. I would also re-seat the valves. Any further top end work ( replacing valves, bore cylinder and new piston ) is entirely based on what is found after tearing into the head.
1st set piston at top dead center, which is the top of its travel. after you have verified top dead center, and you are 100% sure its at top dead, install the cams. first the exhaust cam, with you facing the sprockets, with the cam lobes facing up and away, about the 10 o clock position. once set there, you should see a refrence on the sprocket, with lines that will be parallel with the cyl. head surface. then install the intake cam, with lobes facing in the 2 o clock position. once again, you will see refrence marks on the cam sprocket that should be level with the cyl. head surface. after the cam caps are installed, and the cam chain tensioner, turn the engine with the flywheel bolt to verify you have no piston valve contact. after you turn over a few times, recheck timing.
I put my piston to toop dead center and readjusted my cam chain and it seems to be running fine. The only thing I had to do was to turn the idle up a notch which still kind of gets me....but it's better now.
Turn crank so that timing mark on front pulley is at 0 degrees.
Remove the timing cover and you should see a mark for the cam to line up with.
You want the cam lobes on No.1 cylinder to be pointing away from the followers wether they be rockers above cam or buckets below. This will be the compression stroke.
Once the cam timing is set you can recheck the distributor. It should point to No.1.
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