Replacing cams and cam chain .Replacing the cam and cam chain is not so much the problem as lining up the cams for the timing.Any tips on how to keep cam and crank from moving while lining up the cams?

Did you have a repair manual for your specific vehicle prior, during and after this repair ?
Some vehicles have a special tool that hold the cam sprockets in place while replacing the chain

Replacing the chain and gears requires removing the water pump, dropping the oil pan, removing the balancer and timing cover. Rotate the crank so the dots on the cam gear and crank gear line up at the 6 and 12 o clock positions respectively. Unbolt the cam gear and remove it and the chain. If you need to remove the crank gear you can use a three jaw puller or something similar to pull it off. Reinstall the crank gear lining up the gear with the keyway on the crank and press it on with the appropriate tool. Install the cam gear with the chain and make sure dots line up again. It may be necessary to remove the valve covers and rocker arms as well to rotate the cam shaft if need be.

remove the cover ,wind motor over to Top Dead Centre ,look for timing marks (may need to turn over once more to get all the marks to line up) Mark all the reference marks with a white paint pen to make them clear , Release the tenenser & lock it out remove the old belt ,refit the belt making sure the marks all line up release the tenenser and lock it ,recheck your marks ,wind over by hand a couple of times to check everything is OK refit covers

Put the engine in #1 cylinder at top dead center so the timing marks line up. If you don't move the crank or the cam without the chain installed you'll be ok

Sukkle julle nog? Het my instruksie nie gehelp nie?. Ek die opgetel, dalk help dit?

The way I understand it is that if #1 is at TDC and the T mark is lined up with the crankcase seam - there is no offset woodruff key (i.e. ignition advancer). If you think about, what's changing (when there is an offset key, that is), is the rotational position of the flywheel in relation to any given crankshaft position (i.e. TDC). So...

IF there is no offset key, rotate the crank so that #1 (and #4 by the way) are at TDC. The T mark should line up with the seam. From there, put the exhaust cam in (taking slack out of the cam chain from the exhaust side). When you go to set the cam into the chain do it in such a way that the cam timing mark is slightly ahead (toward front of motor) of the mark on the cam cap (EDIT - Since you're not actually installing the cap yet simply place it on top of the cam in such a way that there is an even gap between IT and the head surface. This way you can eyeball the position of the marks.). Then install the intake cam in a similar manner. That is, set the cam into the chain so the cam timing mark is slightly ahead of the cap mark. EDIT - When both cams are in place, install the cams caps (follow the torqueing procedure so you don't break them OR the cams!!!). After the caps are installed, grab a dowel and stick it in the cam chain tensioner hole and push the slack out of the chain. This SHOULD rotate the cams back (toward rear of motor) so the marks DO in fact line up.

CAUTION: Keep periodically checking to make sure the T mark is STILL lined up properly while putting the cams in. The crank DOES have a tendency to move around a bit while you're trying to jimmy the cams back in.

If the cams are out it's a bit easier since they are not part of the equation yet. It sounds like you're trying to figure out why the T mark isn't lining up when the cam timing marks ARE lined up. Go once step at a time - starting without the cams - as I described above and you shouldn't have a problem.

If you DO have an offset key, you MAY need to get a stock key to get the timing right. THEN, re-install the offset once the cams are back in. This point / tip was given to me by our resident GURU Reelrazor (who I'm sure will chime in at some point).

The diagram below should work for you. Put the piston on TDC. the OHC cam gear will have a single mark or may have two marks, see below. Be certain the front side of the chain is taut when mounting the gear. The cam chain tensioner keeps the back side taut.

That motor has a timing chain, not a timing belt. Replacing it requires removing the water pump, dropping the oil pan, removing the balancer and timing cover. Rotate the crank so the dots on the cam gear and crank gear line up at the 6 and 12 o clock positions respectively. Unbolt the cam gear and remove it and the chain. If you need to remove the crank gear you can use a three jaw puller or something similar to pull it off. Reinstall the crank gear lining up the gear with the keyway on the crank and press it on with the appropriate tool. Install the cam gear with the chain and make sure dots line up again. It may be necessary to remove the valve covers and rocker arms as well to rotate the cam shaft if need be.

put the marks in line with the cylinder head

buy a new chain to make things easier

this is done via a bolt on the outside of the engine located on the head but i strongly urge you to go see a qualified motorcycle mechanic due to the fact that not doing this correctly will cause massive harm to the engine and if the chain falls off then you need to get the engine pulled apart and put back on which will cost you mega $$$$