Topic: Noob 750 valve adjust question

[richenry]

I am just about set to tackle adjusting my valves for the first time on my '74 CB750.  I've done it a few times on my bimmer so it's not a totally new undertaking.

I am confused with what the Honda shop manual says about the order of adjusting valves:

The shop manual says to watch the #1 intake valve then look for the "T" mark, timing mark, and 1-4 cylinder mark.  When they line up the manual says the #1 piston will be a TDC.   

The manual goes on to say that the #1 intake/exhaust, #2 exhaust, and #3 intake valves can be checked from this point.  Rotating the crankshaft 360 degrees from this position allows me to check the #2 intake, #3 exhaust, and #4 intake/exhaust valves.

My confusion is that I thought there would be more rotating of the crankshaft required to get all the cylinders to TDC and the valves in the position to adjust.  Can I really adjust the 4 valves listed above then rotate the engine 360 degrees and adjust the other 4 valves?

I warned you it was a noob question.  Thanks for help in advance.

[mystic_1]

Yup, it really works this way.

The valves need to be check when they're fully closed.  When #1 is at TDC on the compression stroke, both of it's valves are fully closed, and in addition  the #2 exhaust valve is fully closed and the #3 intake valve is fully closed.  Get it?

When #4 is at TDC on the compression stroke, #2 intake valve is fully closed and #3 exhaust valve is fully closed.

You could instead rotate the crank to put each cylinder at TDC on the compression stroke and then check both valves for that cylinder, but the procedure you listed saves time.

mystic_1

[City Boy]

  Hi.The shop manual is correct.Others will be able to tell you why,I can"t put it into words.    Rock On

[richenry]

Thanks for the replies.  You guys really helped me out.