SOHC.co.uk Forums > CB350/400

400-4 Tappet Adjustment using thread pitch

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TwiggsiiieS:
There was a thread on this but got bogged down with electrical connectors.

Just got down to looking at this idea and can confirm that the tappet screw pitch on my 400/F is 0.5mm.

so 1/10 turn would be good for 0.05mm(2 thou).

Just bought a tappet tool too and is much easier! much!

The tappet screw stops quickly as it touches the valve stem, back it off 1/10 (36°), job done!

Or is it? Anyone see a problem with this?

Nurse Julie:
Why not just use feeler gauges?. Alot easier than trying to work out 36 degrees of something hidden down in a black hole. Or, is it just me........And yes, i do use the perfect little tappet tool.

Orcade-Ian:
I agree with the OP, and find it easier with a 36 degree back rotation after touchdown.  Yes, the purist engineers (like wot I am) can tell me that when you tighten the locknut it pulls the thread upwards and increases the clearance but on a good old half millimetre pitch Honda thread I ain’t bovvered.  Still think it’s better than juggling soot with a feeler blade.  Needless to say I made my own tool.

Ian

TwiggsiiieS:
Well I have hands like bananas and little patience with a feeler gauge that's tricky to get in the right place down a black hole and then and then!

I was just gonna make 10 equal marks on the top of the tool, less chance of getting it wrong and paper thin gauge staying in the tool box in tact!

Just bought the tool from Honda Classics with a good knob to make the marks on.

Well I will check one to make sure.

Nurse Julie:
Out of curiosity Ian, I will try the 36 degree rotation next time I adjust the tappets on Hettie, always willing to learn something new. (Don't tell Trig I'm going to try your way, he will give me a lecture on the threads being pulled up on tightening 😭😭😭)

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