SOHC.co.uk Forums > CB350/400

Winter strip down

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mike the bike:
I started on the strip down I've been promising for years, primarily to cure the oil leak from the head and to fit the newer/better camshaft and get some parts powdercoated.
As it's progressing,  a few queries have emerged, which I hope the more knowledgeable forum members could shed some light on.

As I was removing the rocker cover, those 2 head nuts with the M6 female thread (that the rocker cover bolts attach to)  were fairly loose.  The one on the LH side was so loose that that special nut loosened off the head when I undid the rocker cover bolt.
As the leak is from the LH side, would that have caused the leak, rather than a warped head?
The other head securing nuts weren't over tight either.  I did torque everything up when I built the engine,  although I may have missed the aforementioned special nuts with the M6 threads

The other query is the spark plugs are very sooty.  Could it be because,  with the vibration,  the choke has a tendency to turn itself on during a ride or do I need to faff about with the air mixture screws and, if so, what direction?

The float heights,  clip positions,  jet sizes are all standard, as Soichiro intended.

Bryanj:
Undertorqued or loose bolts will cause both an oil leak and a warped head. never had a choke vibrate to on if the locking pin was OK.

I would have the head and block checked for level, rebuild with accurate torque wrench and leave to sit for 24 hours with rocker cover off and check torque before finishing.

I have known both studs and nuts strip threads

mike the bike:
There's no stripped threads, I think you misunderstood.  I was thinking of just torquing everything up again but as it's off the road for the winter, I may as well check for flat anyway.

What locking pin is that then?

Bryanj:
Not misunderstood, just commenting i have seen stripped  ones, from memory isn't there a steel small diameter pin that sticks out of the carb body and locates in an indentation on the mechanism to stop it vibrating shut---It is a long time since i worked on a 400 so that may be a different model

mike the bike:
I think it's just friction that keeps the choke open, I think I'll tighten it up a bit to stop it moving, although I suspect the air screws may need adjusting.   I'll do a search, there's probably something about it on here somewhere.

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