Want to replace cam chain on 1990 1000 exup - 1990 Yamaha FZR 1000

HONDA CBR1000F - CAM CHAIN ... - YouTube

? 6:35
www.youtube.com/watch?v=wT81Vics2cU
Nov 13, 2012 - Uploaded by Naga Thai REPLACEMENT CAM CHAIN & TENSIONER -- CBR1000F This "How To" is ... replace timing chain on honda XL250 motorcycle , part 1 ...
images for change cam chain on cb1000

According to the official Honda Service Manual there is no adjustment. If the cam chain is worn/stretched, it needs to be replaced.
Here is a direct quote from the manual: "Measure the amount of the cam chain tensioner projects as shown (there is an illustration). Replace the cam chain with a new one if the projection exceeds 9.0mm (0.35 in)."
You need two chains and the part is obsolete. Here is some info from partzilla.com
214401-MF5-004
CHAIN, CAM
$157.80 $157.802PART OBSOLETE

14401-MF5-003
CHAIN, CAM
$157.80 $157.802PART OBSOLETE

14401-MF5-000
CHAIN, CAM
$157.80 $157.802PART OBSOLETE

14401-MF5-013
CHAIN, CAM
$157.80 $157.802PART OBSOLETE

314510-MF5-772
TENSIONER, CAM CHAIN
$106.44 $106.442PART OBSOLETE

The 83 & 84 Ascot share the same engine as the vt500c. It may be easier to find the parts in the UK than in the USA.

If it is just a little noise try to live with it.

I hope this helps. Rod

Your EXUP valve must be loosen. Take out the header's part that includes the EXUP valve and check inside. You probably have to use a thread locking agent on its bolts like Locktite.

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).

You have a self adjusting cam chain tensioner. It is sold as an assembly. Take out the complete unit and replace it with a new one. The springs are not bad , the device that keeps the pressure on the tensioner is slipping causing a ticking sound.