Topic: Tappet Adjustment has be Baffled!??!

[bmaker]

I have a 76 CB750F and I am reassembling the engine.  I have read the manual and have adjusted valves about 100 times on other bikes (mostly v-twins and singles) but this one has me a little confused.  I am at TDCC on #1, cam looks to be on the base circle and all the timing marks match.  My understanding is that I should be able to adjust #2 Exhaust and #3 intake in this position.  However, both rockers are already ramping up on the cam.  There is no lash on these in this position.  What am I missing?? 
Thanks in Advance,
Chris

[phil71]

you sure you have that cam in right?

[dave500]

do them one by one watching the valves cycle and close,then bring the tdc mark up,this will also confirm you cam is installed correctly.

[Spiider]

Turn it around another 360 deg....

[MCRider]

If #1 is truly TDCC, then yes #2EX and #3IN are adjustable at that point.

So something is wrong. Stand back and come at it again.

At that same setting check #4/ #3ex and #2IN. ITs either one or the other.

[bmaker]

The Cam install matches the pics in the manual, the tach gear drive is on #4 and the cut out on the end is on the same side as the points cover.  I have it set where the cam end cut out is at the top of the bearing cap and the "T"of 1.4 are lines up.  Does this mean that #1 is TDCC or #4 is TDCC?  I think this may be the issue.  Thanks

[buffaloejon]

I had the same problem when trying to use the shop manual to adjust the valves. There are better instructions out there to adjust them. Like so:
http://www.salocal.com/sohc/tech/vlvadj/vlv.htm

Funny, I'm actually about to rewrite this very same valve adjustment procedure (the one in the manual) for a Technical Writing class 

[MCRider]

The Cam install matches the pics in the manual, the tach gear drive is on #4 and the cut out on the end is on the same side as the points cover.  I have it set where the cam end cut out is at the top of the bearing cap and the "T"of 1.4 are lines up.  Does this mean that #1 is TDCC or #4 is TDCC?  I think this may be the issue.  Thanks

The way to determine TDCC is to rotate the engine forward. Watch for the intake valve of #1 to go down (open). Then watch it come back up (close). As soon as it stops moving up, look in your timing window for 1-4T. At that point you are TDCC #1.

[MCRider]

Set #1 TDCC as explained above. Set 1ex and In, 2EX and 3IN. Turn 360 deg, set the other 4 and you're done. Eazy peazy.   

[tlbranth]

A 4 cylinder in-line engine is always the same. Never mind the TDC #$%*. 1 & 4 go up and down together. 2 & 3 go up and down together. As an example, take 1 & 4. When 1 intake is all the way open, 4 intake is all the way closed. Adjust 4 intake. So take off all the tappet covers. Pull the plugs for ease of turning. Slooooooowly turn the engine  and stop when a valve is all the way open. Adjust its mate at that point. Nothing to remember other than 1 & 4 are mates - 2 & 3 are mates. 3 exhaust all the way open? adjust 2 exhaust. etc.