Honda-SOHC
General => New Member Introductions => Topic started by: Brett72 on November 18, 2020, 09:23:48 PM
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Hi everyone. Thanks to Julie Seal for the recommend to the site. I am new to the CB750 K series but i have purchased a K5 frame and its engine is a K6 which have come from the States There are lots of bits missing and i will be constantly on the look out for bits but more importantly it will be great to draw on all your knowledge and experience if you don't mind. Looking forward to seeing some of your rides, either standard or cafe. Not sure which way i want to go yet. Cheers
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Welcome to the Forum Brett, I'm pleased you found us. . Enjoy your project.
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Thankyou. I think its going to be a long hard but enjoyable journey
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Welcome Brett, I built a CR750 Replica from a spare frame I acquired - do-able but you have to watch your budget as it all adds up - but thats the same if you buy a complete project and mint it
Good luck whatever way you go!
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Cheers Phil
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Welcome to the forum, hope you have fun with the bike as they are great to own and run.
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Morning all. I have a question for you all. I have just taken the alternator cover off the engine and the windings and casing were covered in old oil. When the oil flow around this engine does it go into the alternator or is it just because the oil seal is old. I have no history about it other than it came to the uk from the states around 3 years ago and has just been stored dryish after obviously being drained prior to transportation.
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Yes to oil, the alternator runs wet on these.
Further, it's a "dry sump" motor too. So oil pump has two sections, one pumping into oil feed and supplied directly from oil tank. The other section of the pump sucks oil from sump pan and returns it to the oil tank (also feeds gearbox from this side) to keep the engine as empty as possible during use.
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Thanks Jedi. Your information is invaluable 👍
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Welcome to the forum Brett, enjoy yourself over the winter with the rebuild.
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Welcome to the forum and have fun.
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I'm enjoying my 400/4 rebuild so far - as regards to the cost you will probably have a mental budget that like a house build you will get to the point of no return so just keep on spending until it's finished.
My spend so far is just under my initial budget estimate although clearly I will end up with a final spend that far exceeds it's final value as I haven't started on the engine properly yet.
I keep telling myself that if I played Golf instead then at least at the end of 12 months I have something physical to show for my efforts. I can in my head think of no end of self justifications.lol
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An interesting day. Started to take the engine apart to see what it was like inside and as you can see the evidence of being sat for years ( not sure how many). On the plus side everything came apart easily and nothing was seized.
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Cylinder No:1 has some crud on the piston crown!
Is that a reflection of the piston tops on the bores or is it corroded ?
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The bores are actually ok, nothing a quick hone cant sort out. just need to give the pistons a good clean and a new set of rings. In 2 minds wether or not to take the bottom half apart. There doesn't seem to be any excess movement in the con rods and everything feel smooth. Whats peoples opinions?
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I would suggest stripping the bottom end then you can change the primary chains, tensioner etc etc and giving it a good assessment overall. Would be a shame to get it all back together and in the frame and then have to remove it all again if there is a problem you weren't aware of.
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I think you are right Julie, i am not in a rush so might as well do it properly. Think i need a bigger space in my garage though ;D
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I agree with Julie, tensioner rubber parts will deteriate even if low mileage so while out of frame, I'd strip bottom end
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I think you are right Julie, i am not in a rush so might as well do it properly. Think i need a bigger space in my garage though ;D
May be worth you starting a new thread in the 750 section Brett as many people will look in there for references to engine rebuilds.
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Have just done that called CB750 K5/6/7 :) In the projects section
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Have just done that called CB750 K5/6/7 :) In the projects section
Great.
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Hi Brett
Welcome here, good luck with the bike! :D