SOHC.co.uk Forums > CB350/400
400/4 cyl.head
kenny1059:
Agreed it is not the best of heads. Anybody know where I can find a better one? I have another head,but it is in a far worse state. :(
The camshaft has very slight marking on it. Should be o.k. b.t.w. The marks on the l/h bearing are drips of oil.
Might tap them M7,if I don't go the helicoil way.
cheers, Kenny.
Trigger:
OK, found my glasses. Sill showing a oil starvation problem. Could work with a 7mm tap. I would still be looking for another head with those marks. If you could line bore these heads it would be a lot easier.
AshimotoK0:
--- Quote from: trigger6969 on August 12, 2014, 07:20:09 PM ---OK, found my glasses. Sill showing a oil starvation problem. Could work with a 7mm tap. I would still be looking for another head with those marks. If you could line bore these heads it would be a lot easier.
--- End quote ---
Just read the latest Classic Bike article on the 400/4 they are restoring and the head they have has been fitted with Kawasaki shell bearings (by PO) in the head and the cam cover had been replaced with a new one. I always assumed that the cam cover would be line bored with the head but obviously not the case. Never seen anyone fit shell bearing before only needle rollers to a 500/4 from memory. (and on the twins but that's a totally different arrangement with two end caps).
Cheers ... Ash
Trigger:
Ash, if you have a head with end caps it can be white metal and line bored. No end caps is a problem.
AshimotoK0:
I've now got two nice sets of end caps for the 250 (took some bleedin finding though.. usual German transaction rather than eBay UK 'well they look serviceable mate rubbish'). I have also got a worn pair and all of the needle roller parts and spacers etc (Timken) to do a needle conversion with them. Think I am just going with standard and bung all of the needle roller bits on eBay sometime. Don't let anyone on HondaTwins.net tell you those needle roller components can be had for $50 ... even with mega trade discount they cost double that ( well for decent quality and with the oil hole in anyway).
I did once see a CB360G5 with cam bearings that were phosphor broze bush inserts. Problem is you need to 'scallop' out a bit to let the oil puddle... OK if you are an experienced machinist but there is not much 'meat' to bore into.
Cheers ... Ash
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