What to change while open :-) ?

[spouki25]

Hi everyone,
My name is John and I'm from Belgium,

I just bought a Honda CB750F 1980 in some pieces (most of the cycling part are still on but all the engine part and cover completely disassemble
The owner certified me that everything should be there.

So I started to disassemble all the engine (because we didn't know the state of that bike (clutch, gears, starter, etc...) to clean and review everything.

My question is, what should I change / replace while my engine is open (crank case open in 2) ?
- all the O-ring ?
- the bearing ? all of them ? which one ?
- what about all the bolt stud ( 90031445003 ) for the cylinder and cylinder head ?
- ... ?
- the valve ?

I know about all the engine gasket (set) and all the pieces that looks or are not 'in the norm'.

If you could help me with this, the goal is not to rebuilt a war machine, but a week-endly bike for some nice ride who can old on :-D

This is my first time unmount that much of an engine but we can find a lot to disa- and rea-ssemble the engine

Thanks a lot for your comments and advice.

Greetings


John

 

[BAHNST]

Could think about cam chain and guides...a bit of a weak point...theres a race spec mod you can easily do with the engine open.

Starter clutches a weakpoint in the 750/900 dohc...theres a R6 modification you can do..

If interested in the cam chain mod, let me know and ill send you a pdf describing it and a parts contact.

 

[Jwill945]

Could think about cam chain and guides...a bit of a weak point...theres a race spec mod you can easily do with the engine open.

Starter clutches a weakpoint in the 750/900 dohc...theres a R6 modification you can do..

If interested in the cam chain mod, let me know and ill send you a pdf describing it and a parts contact.

If he’s not, I def am interested. Have a 1979 cb750k completely disassembled in garage right now and need a starting point to get going.

 

[BAHNST]

If he’s not, I def am interested. Have a 1979 cb750k completely disassembled in garage right now and need a starting point to get going.

Attached overview-there's a link in the pdf that gives you the install guide

 

[BAHNST]

R6 mod....

 

[Jwill945]

Attached overview-there's a link in the pdf that gives you the install guide

Perfect, thanks!

 

[spouki25]

Incredible !
Thanks a lot, this looks really nice and in a way better shape than existing ;-) !

Thanks also for the PDF with all the new and better adapt parts, I will have a look about how much everything will cost

I allow myself to go back to my request,
what I'm suppose / need to change on my engin while open,

I'm sure about the gasket (nearly a necessity)
but I don't really know what else
what about the bearings ? which one ?
the bolts ? I'm suppose to change some of them ?
the engine studs ? should buy new one ?

please help me :-$
I'm trying to get that motocycle ready for the new season in coming (^_^)


Thanks in advance

greetings

 

[spouki25]

Hi all

I'm coming back with my first question, and i'm sorry in advance, in a series with many other (probably)

So I dismantle it and clean it all order all my seal, plus missing part.

I'll start building everything back, while controlling every tolerances
and I facing a little problem,

In the manuel it's mentioned that I should add molubdenum disulfite grease in the groove
(see picture)

but when i read more about that grease they advice to not add lithium grease inside the engine because with the mixe with oil it could go and fill the tiny hole for oil.

Does someone has an idea (or the modele of grease really) I could use on that particular spot ?


Thanks in advance for advice and following ;-)

 

[brettp]

That specific grease is resistant to high heat and high pressure. It is mandatory to use that and avoid other grease or lubricants.

 

[spouki25]

That specific grease is resistant to high heat and high pressure. It is mandatory to use that and avoid other grease or lubricants.

And so, could you point me for a specific kind of grease ?

because (as I read) if it contain lithium i could block some oil's hole, and it appears that nowadays there is lithium in that type of grease (which I suppose it is for 'outside' motor use

 

[brettp]

I'm not sure I understand your question. If the manual says use moly there, use moly there.

 

[Bo82CB]

I am sure there is engine assembly lube available in Belgium. It doesn't have to be paste, modern assembly oil style lubricants will provide great protection for first start up.