SOHC.co.uk Forums > CB750
Engine full of fuel and seized up
PJM47:
ok thanks, will look at doing do all that.
Any recommendations as to a good gasket set and piston ring set? DS spares seems to be out of stock on both. There's a few on ebay but I've no idea of quality.
e.g.
https://www.ebay.co.uk/itm/Honda-CB750K-Four-1969-1978-Complete-Engine-Gasket-Seal-Rebuild-Kit/112709539389?hash=item1a3e03163d:g:SMcAAOSwN7pamvaM
https://www.ebay.co.uk/itm/Full-Gasket-Set-For-Honda-CB750F1-2-K1-7-SOHC-1970-1978/121817106884?hash=item1c5cdd89c4:g:H5MAAOSwrklU2js3
MrDavo:
I used a Vesrah gasket set, everything was there and fit fine, but the genuine head gasket is far superior, and has a 'sticky' finish which the pattern ones don't.
Following advice on here, I got a genuine Honda head gasket from CMS, it cost more than the whole Vesrah set. Worth it for the peace of mind in my opinion, as has been said you only want to take the engine out once.
Trigger:
The gasket sets in the link are no good for early 750K's. You will need Vesrah VG156/556 for a early engine and i am out of stock of those. Phone Sliver and ask when he will have Vesrah gaskets back in stock but, make sure it is VG156 as he was selling VG158 for the early engine which was wrong :o
If you need seal kit, cam chains or any upgraded O'rings then, ask Nurse Julie.
For rings: These are cheap but they are Riken and i have fitted over a 100 sets of these >>> https://www.ebay.co.uk/itm/69-76-HONDA-CB750K-STANDARD-PISTON-RINGS-SET-4-RINGS-INCLUDE-11-CB750KPR/254040843680?hash=item3b2603a5a0:g:D0MAAOSwfQRXMPEZ
paul G:
--- Quote from: Trigger on October 15, 2020, 05:37:05 PM ---As PaulG has said, you are in there and you don't want to take it apart again as Paul G knows very well ;)
Look at changing the primary chains, cam chain to a up graded FTH DID, all the o,rings, including oil pump and inspect the primary chain tensioner to see if it has gone hard and brittle, check the cam chain tensioner, mid wheel and cam blade for brittleness, cracks or chips. Check the piston rings are not suck in there groves and turn easy. I would throw another set of rings on to be on the safe side and they can be bought for around £40 for a full set. Always use a top quality gasket set and upgrade the O'rings that are in the kit.
Put the crank on a bench and put all the rods on in the correct order and the right way round, torque them up and make sure they turn on the crank very easy with no tight spots ;) Build up the bottom end first and test everything before even temping to put the top end on.
We like pictures so, loads of photos as you go and we can advise if something is not quite right.
--- End quote ---
In my defence it wasn’t through skimping on parts :D all I can say is my engine came in a million parts and 5th gear fits both ways and only one is correct :(
PJM47:
Thanks really helpful advice. I’ve ordered those piston rings and will look for the right gasket set.
I’ll go for cam chain as well so will need that and if there’s upgraded o rings that help sounds like a good idea.
Not sure if I need primary chains yet, they are quite expensive..
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