250 xc 1985 2 stroke water cooled

I need help!
All whats left, to finish my little project is to redo the engine timing.
Can anybody provide me with a simple way of doing this without taking the engine out of the frame.
I need "F" from TDC or an angle (ignition advanced position).
Does anybody have the technical data sheet for this bike.
Thanks for the help
Fabi

In frame in mm.

The owners manual shows the sugested method by using a dial indicator in the spark plug hole.
http://www.yourhusky.com/files/87-ownersman.pdf Pages 71-72

Thanks to all of you!
You are just great
Thanks
Fabian

i used a zip tie with pink txta on it for mm markings down the spk plughole .. dodgy as. but it lined up with the old timing marks and starts first or second kick. close enough

Sameadvance for both SEM and MOTOPLAT ignitions ?
Thanks

http://www.cafehusky.com/threads/vi...ech-data-and-husvarna-service-bulletins.4694/