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Honda CB750K5 Restoration by Royhall
Laverda Dave:
Good progress Roy. No matter how big your garage is it will never be big enough after the first year because you will fill it with more bikes!
Oddjob:
Curious Roy as to why you chose to pick those tyre sizes. The front is stock but the rears gone bigger. Any reason? I'd have thought you'd have gone for a 3.60 to match a 4.00.
Asking because I kinda like the look of the Avon Road Riders and was checking on sizes for mine, I always go bigger than standard as that's how I raced the bike back in the day, so I decided on 100/90 front and 110/90 rear.
royhall:
Well spotted Ken. Easy answer, I didn't order that size that's what they sent and I didn't notice until you pointed that out. That's why the wheel builder had to buy an inner tube as the one I sent was for a 3.60. Bugger, I hope it goes in the swingarm without hitting anything. I am doing a few stupid things like that these days, and I thought it looked a bit big. Thanks for pointing it out, may have to change the tyre. Am going now to check what I actually ordered. Bugger, Bugger, Bugger.
EDIT: It appears that the sizes I have gone for are OEM standard and it was the inner tube that was supplied wrongly. Tyres Honda CB750K1 / K2 / K3 / K6 (SOHC) 1970 to 1976 (bits4motorbikes.co.uk) Thank heavens for that.
Oddjob:
Weird that Roy. Honda seemed to have a formula that the rear tyre was the next size up from the front tyre. Like the 500 was the same front 3.25 but the rear was a 3.50. Maybe the 750 was the exception in that it got a wider rear rim than the 500 so it suited a slightly wider tyre as a result.
Never noticed that before but at least you don't have to change the tyre, so that's good news.
royhall:
Sorry for the delay. There has been a fair amount of progress on the bike, just no time to document it all on here. I'm still waiting for quite a few things to return like, chroming, paintwork, polishing, etc.
I am also still waiting for the promised exhaust system that I paid a £500 deposit on last November with Colin at Predator Motorsports. Colin reckons the exhausts were already made but he was struggling to find a route from Japan that was cheap enough as container prices had gone through the roof. I have asked him via email recently about it but the reply was simply "Nothing yet" which doesn't tell me much.
I have mainly been concentrating on the engine for now. I had the cases/barrels/head vapour blasted then gave them a really really good clean to remove any traces of blast media. My jetwasher has a small nozzle device that is really useful for the small drillings along with the assortment of bottle brushes. Then after masking up they got three coats of the usual Simonize SIMVHT31D (worryingly I now know that number without looking it up) then backed in the oven at 150 degrees for an hour.
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They came out looking really nice so am well pleased. Virtually as soon as the barrels were out of the oven I took them to the engineering shop for a rebore. Once again I am using the Cruzinimage piston kit as the quality is very good and the price is excellent. The engineer worked to each piston seperately and gave them a 0.001" clearance. This was after an extended debate about it being too tight and it will seize. In the end a gave him a signed note that that basically said it's not his fault if it seizes. Anyway, looks like he did a good job just hoping he really did it to 0.001".
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Am hoping to get into the garage this afternoon and finally get the engine lower half back together.
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