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Topics - Frankie 2 sheds

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CB750 / Offset front sprocket

« on: November 14, 2018, 09:59:02 AM »

Hi Guy's. Still in the process of re-building a special. The K6 engine has now been completely re-built and have turned my attension to the frame. I'm using a 2004 GSXR 600 doner for the front and rear. Having now got the GSXR rear swing arm and wheel on I now need to line up the main drive. A 10mm offset front sprocket will get me there or there abouts. There is very little room to fit a new standard sprocket let alone a 10mm offset one. Before I layout £80+ for the offset has anyone else fitted an offset on a fully assembled engine block??? or are my worse fears coming to fruition in that I would have to strip the engine again......Frank

Project Board / Is this a stupid question ?

« on: January 29, 2018, 03:25:36 PM »

Just completing the engine re-build on a cb750. The plan is to make the bike as naked as possible. With that in mind I want to get rid of the oil tank. Here's the stupid question....If I re- direct the flow of oil to the top of the engine and have a wet sump, what's the issues? (I did say it was a stupid question).......Frank

CB750 / clutch spline washer

« on: January 24, 2018, 12:06:24 PM »

Hi, I am currently doing a complete re-build of a 1976 750K6. Iv'e got to re-newing the clutch. On refitting the clutch housing, the rear housing engages on the main drive with the kick start and you then fit the circlip. You then take the splined washer (25mm) slide it down the splined clutch drive only for the spline to finish and the washer float around on a reduced clutch drive, ref pics attached. Is this correct? I'm not on my own. I've looked at earlier members on the forum asking the same question but with no clear indication as to wether it is correct or not. Hope you "tremendous knowledge guy's" can help........Frank

CB750 / Mix n Match

« on: November 23, 2017, 05:42:56 PM »

Just what have I got! Please bare with me. Some of you may remember some weeks ago on my introduction, I asked you guys to identify what model of cb750 I had. We more or less agreed that it was an F2. On further investigating the engine, number it had to be a K6 engine in an F2 frame. On confirming the engine had to be a K6 why was it painted black? Obviously someone was trying to keep the F2 look. Knowing that the bike was going to be completley re-modelled I decided to remove the black paint. When blasting the bottom end of the engine the painting was very poor and came off quite easy. However when I moved up to the barrels and top end the paint looked like a factory finish even the bottom of the fins had paint in them. I carried on until engine was finished and thats were the questions started. Can an F2 top end sit on a K6 bottom end? What can be interchanged on the engine? The reason been is that the barrels are badly damaged on the face (pic) The rocker carriages mountings on the head have all been helicoiled all but one (pic) Is the head off a K6 or F2 (pic) So it would be good to know what will fit to what when looking for replacement parts. Hope you clever lot can help....Frank

CB750 / cb750 F2 engine out

« on: November 05, 2017, 10:18:00 AM »

what a nightmare, trying to get the engine out. Having digested most of the posts on this subject and reading manuals I tried and tried to get the engine out as instructed. I eventually had to remove the exhaust studs and she came out easy. On inspecting the studs some were just threaded bar and I'm thinking these cant be original. Anyone know how long they should be. I'm also a bit confused about the oil filter housing. When ordering a new oil filter for an F2 they only show one large o ring along with the small one for the bolt. I have the housing for the filter plus an extended housing that has vents. This too has a large o ring. This secound housing is not shown in the Haynes manual so I'm confused as to what filter I need. Any help would be appreciated.

New Member Introductions / Hello from Filey

« on: October 16, 2017, 10:11:29 AM »

Just bought a 1980/1 cb750 k5 I think. Will ask you guys to verify that when take some pics as i'm totally confused with the vin/eng numbers. I've just finished re-building a Yam XS750 cafe racer. It took me 4 long years with the help from the xs750 forum whish was invaluable. At this stage I'm not sure which way to go with the cb. I'll proberbly go the cafe racer root as it tends to be less expensive than original and you know its a one off. I'm looking forward starting the project with your help during the long winter months. Thankyou Frank