SOHC.co.uk Forums > CB350/400

Smokey rebuilt 350

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royhall:
Any ideas guys....... Rebuilt the 350/4 about 9 months ago and so far it has only done 240 miles...... At first it ran very clean but has slowly started to smoke on pots 2 &4....... I have checked all the usuals such as carbs, timing, points gap, valve clearance etc....... I thought at first that it may have been rebored to a too loose tolerance but having done a cylinder pressure check they all come out at 165psi dry and 210psi with a few shots of oil (hot engine), so I am ruling that out....... My thoughts now are with the Cruzinimage gasket set I used ie. non factory head gasket and cheap valve stem seals....... Also the plug out of No.4 is always wet when its pulled.......Any opinions before I pull the head back off..... Cheers.

hairygit:
Is the plug wet with petrol or oil?

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royhall:
Quite hard to say for sure Hairy. But its black and doesn't really smell of petrol, and its still wet an hour after coming out. So I would say it's oil.... No.4 is very smokey. Whats the opinion of the stem seals in those Cruzinimage kits?

hairygit:
I've not used them personally, but those who have seem happy with them. I would give it a few more miles to bed in the oil control rings properly, as 240 miles is nowhere near run in yet. Try taking it out at least once a week, and put at least 50 miles a ride on it, then see if the problem is still there after 800-1000 miles, until then I wouldn't get worried about it. Keep a close eye on the oil level, it will drop if it's burning oil badly.

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hairygit:
Thinking about it, the 350 does not have stem seals on the exhaust valves, maybe what you are describing is "normal" and the reason Honda fitted inlet and exhaust stem seals on the 400/4?

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