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CB750 Gasket sets - any recommendations

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AshimotoK0:
Interesting discussion from the 750 Sandcastonly site. Personally I am just going to use the NP one I have with the extra 'O' rings detailed in the Service Bulletin. The NP gasket set BTW is the only one I have found with the rubbers for inbetween the cylinder fins included in the gasket set (not sure on Honda one ...so long since I have seen one). The pucks are used to seal the holes that give access to the recessed  head nuts.

Don R
Head gasket Q?
« on: November 02, 2016, 01:01:30 PM »
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 Is there a source for proper head gaskets for an early head? If I were to contact cometic about making some I'd assume I need the thickness and composition information. Not having one for comparison I wonder how close the rest of the gasket is besides the center bolt?
kp
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Re: head gasket Q?
« Reply #1 on: November 02, 2016, 03:19:19 PM »
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Other than the extra hole at the front the other bolt holes are smaller in diameter. The newer gaskets also have a sticky area between cylinders 2 and 3 to help with sealing which was a good feature.The early production gaskets didn't have this. I'm sure you would get a lot of interest if these were remanufactured
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Steve Swan
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Re: head gasket Q?
« Reply #2 on: November 03, 2016, 10:21:16 PM »
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the sticky head gaskets make head removal a horror.  the issue of preventing oil leaks is as much in the thickness of the head gasket
 as it is in the thickness of the O-rings fitted.  I've started using Vesrah head gaskets and a slightly thicker O-ring and had no oil leaks running the engine on the test stand and during operation in the frame.  i don't have the thicker O-ring measurements as i write this, I  do have the measurements at my shop.

Steve Swan

philward:
Ash
Do you have the size of the extra thickness o rings that is referred to in the quoted post above. I remember fitting them to my last rebuild but didn't keep the info - It will same me trawling .net again if you have the size
Thanks
Phil

AshimotoK0:
From memory it was something like 15 mm i.d. x 1.5 dia. in Viton   but that's purely from memory of a very old email sent to me. I have emailed the restorer who originally gave me the info and I will get back to you Phil

Trigger:

--- Quote from: AshimotoK0 on November 13, 2016, 09:17:31 AM ---From memory it was something like 15 mm i.d. x 1.5 dia. in Viton   but that's purely from memory of a very old email sent to me. I have emailed the restorer who originally gave me the info and I will get back to you Phil

--- End quote ---

It will all depend on the thickness of the gasket, the ID of the stud hole in the gasket and what 750 engine it is for ;)

philward:
My 'recent topics' screen has disappeared! Is it just my PC or is it the same for everyone?

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