NZ parts

[dingleberry]

Have a look in the stator cover. One of my 400s seemed seized but after taking off the cover it was the starter gears locking up.

[750tracker]

It turns but locks at a certain position. I have pulled the Stator cover off and it still does it. Will take the clutch cover cover off and see if it does it.

[dingleberry]

Are the gears that drive the counterbalance shaft still there? Have you had it running at all?

[750tracker]

Yea had it running when I first got it. It had a bad knock to it. So pulled it apart, 46mm nut was loose. Tightend it. Went to turn the motor over. turns half a revolution and locks.

[PwrManDan]

are you turning by hand or using the starter motor?

[Guerrero]

the same "symptoms" was for my bike-half turn,1 compression and lock.and to the back.But my 1 cylinder was dead,pystons kissed with head :)

[fret not]

Yea had it running when I first got it. It had a bad knock to it. So pulled it apart, 46mm nut was loose. Tightened it. Went to turn the motor over. turns half a revolution and locks.

Maybe the cam chain slipped a tooth or two.  What condition are the cam chain tensioners?  You have to removew the cams before the heads can come off.

[750tracker]

Rod bearing for the rear cylinder is stuffed. there is 2-4mm of vertical play. Im sure cranck will be stuffed but havent completly stripped down the motor yet.

[Rikugun]

Wow sorry to hear that. It does seem to happen now and again.

Is the top end off and does the engine now turn over?

[dingleberry]

How much do you want for engine? Freight would be the problem

[750tracker]

Motor still wont turn over fully.

If I can find a second hand motor, I would sell mine but you name your price i guess.
Given up finding a new piston and rings.