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Thanks. Yeah I think my seller was one of those deliberately mis-describing cheap pipe as quality stuff. I'll buy the next lot from somewhere with a good reputation

Thanks for that ! I've noticed that automotive exhaust components are stupidly cheap online, it's only when you mention motorcycle that somehow the price becomes a kings ransom

It might help if you stated exactly what model CB750 you have. From your description I'm thinking CB750F - F3, or K7/8. If the bolts have actually come out, but ripped the threads out of the head in the process, well, maybe it's a blessing in disguise. At least you don't have sheared off...

That sounds really good. Is that a modern Yoshimura pipe then ? So now all I need is for some kind person to open one up with a tin opener and measure up all the internals for me. No, seriously, I'm very good at reworking and modifying tired old exhaust systems. My old F1 ran a Frankenstein...

I've already cleaned it up once, with a P80 flap disc on a grinder. Then I put it back on the bike to get it running, and left it on, outside in the weather. Now I'm just wondering if they do VHT paint in a rust colour, so I'd never have to retouch it

Does anyone sell an oil pressure gauge kit in the UK ? Looking for a small size guage that will fit at the end of the oil gallery on the RH of the engine. I could probably make one up from bits ( I'm employed as an engineer), but TBH, if someone else has done the legwork first, I'd rather pay a...

Same thing happened to me with a scabby GS550 I bought a couple of months ago. I was so thrilled to get the thing and another bike in bits for peanuts, that I totally forgot to check what was holding down the seat. Fortunately I looked in my mirror just in time to see the seat fly off the...

I'm in the same situation at 66, I'm wondering just how many motorcycle summers I've got left in me. I might feel a bit better if something I had was actually up and running, not strewn in pieces all over my yard

Any idea what make of pipe this is ? It was fitted to my US import K4, but the cylinder head fixing is the F model/K7 type, the K4 stubs having been removed from the cylinder head. There's no baffles whatsoever and no rear fixing point at present. Mercifully, automotive exhaust components...

Many thanks ! I thought that O'Reilly only operated in the US, but a quick Google search reveals apparently 500 stores in the UK. Well TBH, I've never seen one yet. Worth a try at least

They will turn up eventually if you wait long enough. Just how long can you afford to wait ? Twenty years ? Of course after you have spent good money on pattern parts and getting them painted, only THEN will someone offer you a perfect original set.

I just hate paying good money for cheap junk ! Only about nine months ago I bought new fuel pipe in order to get my F1 and K4 (ish) hybrid ( a sort of unholy union of K1 and K4 parts) , up and running. This fuel pipe was supposed to be top quality neoprene, and totally ethanol proof. Well...

Maybe. Can you borrow a pair of coils rather than buying them ? I'd look at the condensers too, I've known them to do weird heat related stuff

Thanks for that, I've screenshotted those pics for future reference. Those F2 brackets are absolutely enormous. The Errol Flynn of headlamp brackets ! I've got a couple of F1 type headlamp mount frames (400/4 styled), so I might just modify one of those to suit, or maybe fabricate something...

Sorry to hear that those K7 type headlamp brackets can't be modified to fit, as used ones seem to be going quite cheaply here, and considering that the K7 seems to use a combination of F1 bottom yoke with F2 top yoke, I'd have thought that some sort of tastefully bodged solution would be...

I'm having second thoughts about my F2. I originally only bought the beast because it was local and cheap, and would make a good source of spares for my F1, however, now I'm starting to warm to the idea of having a F2 in my SOHC stable. There's a lot of rough bits that are going to need a ton...

I'm undecided about how far I want to go in making my CB750K1 as original as possible. At present I've gone as far as the correct painted type headlamp brackets, but my top yoke and instruments are from a K4. Finding a correct "Rhino Horn" yoke and a decent set of K1 instruments looks like...

I think that maybe you're out of luck with that one. The forks on the CB750A would seem to be related to the CB750F/F1 and also the K7/K8. Mudguard mount holes are staggered like the earlier 750 forks, so I'm guessing that you've got loads of used mudguards to go at, but the styling will be...

I read recently that setting the idle speed too low is a major cause of cam bearing wear on these engines. I've no idea if that is true, ( and someone will probably come along now and say that it's bullshit), but just in case I'll be setting my idle speed on the fast side from now on.

It does make you wonder why Honda didn't just uprate the studs in the first place, rather than introducing seals that would mask the issue instead.

That was the next question I was about to ask, because, yes, there's silicone sealant between the cylinders. Oh well, too late to weld them now, it should have been done before boring out for the liners.

Thank you ! I'll use those photos as a reference. I've already noticed something about the 72mm barrel. The "wells" around the cylinder stud holes which normally take the dowels and seals seem to have been welded up, and then the top face has been skimmed.

Unfortunately, I only bought the cylinder. I appreciate that there's loads of research and planning (and spending) to be done before this thing will ever run again. I'm looking at it as a long term project which might take a couple of years to come together. Not sure about cylinder head work...

Getting bigger ! Now I've got 61mm, 67mm, and 72mm to choose from. The biggest bore barrels are going to present a significant engineering challenge, forged rods definitely, other mods required also. What I don't want to build is something that has a truckload of high frequency vibration.

Thanks for that ! I'm old, and I appreciate a fat torque curve more than big horsepower figures at high rpm. I appreciate that there are other classic bikes which lend themselves to tuning better (cheaper) than Honda's four. Bikes with roller bearing crankshafts like Kawasaki's Z1 or...

Well TBH the bores on that big bore barrel are not exactly brilliant. No deep scoring, but plenty of light scuffing. It's going to need a good hone anyway. Then assuming that I can get some pistons/rings to suit, the $64 question is rods. Apparently the 836 conversion is OK with the...

Successfully uploaded at last ! But I'm not sure how I managed it

I was watching a clip of a dyno run of a 1032cc bike in the US. A reliable 95 BHP at the rear wheel, with an externally standard looking bike. OK, so you could get a lot more bang for your buck by buying some 20 year old sports bike and not modifying anything. But I really like my old Honda's...

Thanks for that. They are selling on ebay UK, at surprisingly low prices. I'm glad that you posted that, because I until now I thought their rods were forged Aluminium alloy, something that I'd avoid like the plague. Chrome Moly Steel rods for $1000 AU That's less than £550 sterling. Even with...

Thanks for that. We have a selection of quality digital micrometers at work that I can access on Monday. An inside micrometer would be better, not sure if we have one. If the kit was from cycle x, it could mean a lot of expense for me, due to being located in the UK. No NOS pistons or rings...