SOHC.co.uk Forums > CB500/550

New head gasket blowing and lumpy as hell ...

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madoc:
Here is the camshaft alignment vs points alignment.

There are two lines against the F mark.
I am matched against the first one.
Moving the engine a few degrees brings up the second ..

Is this correct ?

I cannot seem to be able to release any tension on the camchain to walk a link around the sprocket to see what effect that has.... no amount of fiddling on the adjuster does anything. The chain is really tight.
It took me hours to get the sprocket off/on the other week.

mickwinf:
 as above cam is in correct position but you should have the T mark aligned so you are probably a tooth out.to get some slack back off the adjuster, if it is a new chain you may have to unbolt the cam sprocket to get the slack.

madoc:
You cannot see the F marks, in my original picture, they are  out of sight to the right.

I found a picture on t'internet (to save me going back out and trying to get all the marks in)

Just to clarify, are you saying that of these two "T" marks, the one I am lined to is NOT the one I need and the one (you can see in the picture just to the left) is the actual TDC mark ?

Bryanj:
You need the mark that the arrow IS NOT pointing at (Marks in order turning clockwise are 2 advance marks then the Firing F then the TDC T) and to release the tensioner loosen the locknut then carefully insert finger or screwdriver to push the blade to the back and whilst holding there re-tighten locknut.

Even when in this position you will not be able to walk the chain without unbolting the sprocket from the cam and letting it off the register it sits on

madoc:
Ok
Finally had a few hours today.
Re-torqued the head, re-aligned the camshaft as instructed (and triple-checked it), helicoiled a stripped thread, refitted rockercover, carbs back on correctly (I bought some more hoseclippy things as they had cable -ties between carb and airbox).

Started bike and it sounds even worse. Much worse. Won't even idle now.

To be fair, the bloody ignition switch seems to let me take the key out and stay on.
It had a flat battery and I may have cooked a coil. I'll check the resistance across them.

I had a search for a youtube clip of a honda SOHC four, running on two, but couldn't find one.
Having only british singles and russian twins then I don't know what a jap four sounds like on two ....

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