SOHC.co.uk Forums > CB350/400
CB400/4 ENGINE STRIP, ASSESSMENT AND REBUILD BY JULIE - NOW COMPLETE
Laverda Dave:
Well done Julie, at least you tried and managed one valve, it's not easy. Fitting valve springs etc is one of those jobs where you need to use your bare feet to hold the springs in place whist one hand holds the spring compressor and the other hand fits the collets. It sounds difficult but you'll soon get the knack of it with practice and a visit to an osteopath afterwards. :o.
Nurse Julie:
--- Quote from: Laverda120 on December 21, 2017, 05:11:15 PM ---Well done Julie, at least you tried and managed one valve, it's not easy. Fitting valve springs etc is one of those jobs where you need to use your bare feet to hold the springs in place whist one hand holds the spring compressor and the other hand fits the collets. It sounds difficult but you'll soon get the knack of it with practice and a visit to an osteopath afterwards. :o.
--- End quote ---
That's where I was going wrong then, I still had my socks on 😁😁😁😁😁
kevski:
I have just looked at that head and wondered how Honda machined the bearing journals, naturally the cover and head are matching, i can speculate how it was done but does anyone know for sure, all of my big Kwaks have been line bored, and many of the other marques of bikes are line bored including Hondas so how were these done?
matthewmosse:
It is indeed a royal swine of a job. My valve compressor is a G clamp and a bit of gp100 fork with a slot cut in it. If 8ts seated just right you can put the head down on a worktop and use both hands to get the college in, but if it ain't quite right it slips off and you are searching the floor for the bits that got launched. Brings back memories of my first cb550 engine rebuild, similar head damage and pistons but all 4 equally dead. My workshop was still in early build phase so I was stood in a muddy puddle using an old sideboard as a work bench. Had to get it back running in 3 days start to finnish so no nice machined bits just whip it appart, lap the valve seats and bung in new pistons, clean out broken rings and sludge, check gearbox for debris and thrash the bike round the top of Scotland and back. It put me right off doing head overhauls especially as engines from breakers were cheap up to fairly recently.
Clem2112:
I have been curious as to how Honda machined the head and cover journals... for 40 yrs !
Nobody seems to know for sure but there are places that can do it in the UK , I hear from other restorers.
The only way I can see that could feasibly achieve the fine finish and tolerance would be a single point cutter but the setup would be very slender. Unless they used a ball end mill and profiled each in turn?
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