CB750 Barn find project - First Timer

[Underdog1]

Just been looking at your oil filter problem .I had a issue with mine .I bought a kit from voxonda in Holland .does away with old housing replace with modern filter . (Attachment Link) (Attachment Link)

Was just a stuck bolt, got it off in the end my throwing the contents of my garage at it. Bought a pattern oil filter bolt from DS for like £8 so I'm all set

[Chris400F]

What about the damaged housing? The face where the bolt seals doesn't look good in your pic.

[Underdog1]

What about the damaged housing? The face where the bolt seals doesn't look good in your pic.

I think it's the o ring on the bolt that does the sealing rather than the bolt head itself?

[mike the bike]

True

[Chris400F]

Yes, you're probably right.
I was thinking the O ring was in the underside of the bolt like the tappet covers.

[mike the bike]

The O ring sits in a groove in the bolt, a few mm from the head and seals against the side of the bolt hole in the filter housing.

[Underdog1]

Had an afternoon to work on the bike today, decided I wanted to get the head and barrels off so I can take it to my new house a bit easier (going to have to work on it in the spare room!).

Took a little while as I'm having to learn as I go, also my Haynes manual is for both K and F models so can be misleading at times.

Got the rocker cover off fairly swiftly after having to carry the lump out the garage and giving it a quick clean off.



Didn't really understand how the manual wanted me to align the timing marks as it appeared to show the person turning the sprocket with their fingers..? I just took the stator cover off and cranked the engine around until I had access to both bolts that hold the camshaft sprocket onto the cam. Getting the cover back on was an absolute pain in the arse!




Some numbers I found on one of the cam shaft bases above cylinder 2, any ideas??



After finding the correct pattern for tightening and loosening the cylinder head bolts I got the old boy off relatively pain free. I also dropped the chain down the tower for fun



Top of the pistons look very coked up.



Underside of the head, not sure what I'm looking at here, will do some reading up.



I bought a feeler guage for measuring piston gap, couldn't get the smaller feeler (.038mm) down the side of any of the pistons. Maybe I need to clean all the crud off first and check again. Anyone know what the max gap should be?



Eventually wrestled the barrels off and only damaged one cooling fin when I resorted to hammering wedges of wood. Not too fussed about this.

Wear on pistons, again I'm unsure what's acceptable so more research required.




Barrels look smooth as glass, no obvious signs of wear to my untrained eyes.



Glad to be getting back into it, looking forward to getting the lump back to my new home so I can work on it home now so I can work on it in the evenings and spill dirty oil all over my beige carpets 

[Trigger]

You don't measure the ring gap that way.

[MCTID]

You most certainly don't measure Piston Ring gap that way. Check it out on Youtube. PMSL.

[mike the bike]

The Haynes manual should explain how to measure the ring end gap.  If the bores are as smooth as glass, that's too smooth.  The bores need to be cross hatched,  I would suggest some tutorials on YouTube which will give you an understanding of the principles involved.  An engine rebuild is not something you want to fcuk up so keep asking questions.

[Nurse Julie]

I would be very concerned about all the pebbles in the bottom of the barrels 

[Underdog1]

Thanks for the advice everyone, yeah I'm out my depth but if I don't do it now I'll never learn how.

Haven't actually looked into how you measure wear on the different bits, main effort was to just get the top end off to make it a little easier to transport (doesn't seem to make much difference though!).

How do the clymer manuals rate against the Haynes btw? Might get one of its a bit more descriptive

[Nurse Julie]

There are proper Honda manuals you can download from tinternet, maybe also in Ash's drop box but not sure. Also on SOHC.net

[Chris400F]

....maybe also in Ash's drop box but not sure.

The CB750 Shop Manual is in the mega 750 download in Ash's Dropbox.
Fortunately for you (as the download has about 1,000,000 pages) it is right at the beginning so you won't have to hunt for it.

[Underdog1]

....maybe also in Ash's drop box but not sure.

The CB750 Shop Manual is in the mega 750 download in Ash's Dropbox.
Fortunately for you (as the download has about 1,000,000 pages) it is right at the beginning so you won't have to hunt for it.

Cheers mate will check it out.

Went to Motorcycles Live at the NEC yesterday, was decent but didn't see any old Honda SOHCs. Had a look at some lifts and stands as it's a nightmare working on the engine on the floor. Didn't really have anything that looked useful to be honest.
For stripping and building a bike what are the best stands to use? Headstock stand and rear paddock stand? The scissor belly type lifts look good but I'd have to take the headers off to use one.

Also I've seen people adapt V8 engine stands rather than use bike specific ones, what's the advantage to this?

On another note I entered a competition to win some tyres and had to hold a tyre out in each hand for as long as I could. Came second to some unit, gutted! Could have done with some freebies!