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Topics - royhall

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211

CB750 / Taper head race bearings.

« on: August 15, 2014, 05:37:55 PM »

Hi. Bit of advice required if somebody could oblige. Am about to change the head race bearings on my 750F2 for taper bearings. Have bought a set that has the two races (fairly obvious which is top and bottom due to the different sizes). My kit also came with a large steel washer. Does anybody know where this washer goes. I assume it's there to build up the stack height to match the original ball races. My guess is that it goes underneath the bottom race on the yokes, but it is only a guess. Help Ta.

212

CB750 / Gasket sets

« on: August 01, 2014, 05:39:35 PM »

Picture the scene. All engine bits nicely repainted, all machining etc done, all spotlessly cleaned and neatly laid out on the bench. Here we go, open the 'full' gasket set and get assembling this beast. "But wait" where's all the bloody o-rings. Not a single o-ring has been supplied in this so called full gasket set from M&P. Has anybody else had this problem with Honda sets. Have so far rebuilt Triumph, Norton, and 3 Kawasaki's and not once have I encountered this problem. In fact the Kawasaki sets had extra's in them (that caused another problem in thinking I had missed some out) but hey, better that way. The question is, do I now need to identify every o-ring and order them separately, or can I just get an o-ring kit and use that. Not sure what type of rubber they are etc. Anyway the jobs stopped yet again whilst I wait for parts that should be there already. Happy days.

213

CB750 / cb750f2 frame.

« on: June 14, 2014, 06:00:04 PM »

Just started on an F2 rebuild on a bike I bought as part of a job lot some months ago. Unfortunately it appears this bike has had a smash and has been very badly repaired. The frame is really a write off. Does anybody have a spare F2 frame with V5 they would consider selling. Other than that i may be selling off a whole bikes worth of parts. Would rather fix it though. Thanks guys.

214

CB750 / Gearbox whine and clutch rattle

« on: May 26, 2014, 07:35:51 PM »

Hi all. Just bought an F2 sohc that's been standing for about 4 years. Wasn't running when I bought it so did not get the chance of a test ride (price was very good so took a chance). Been through it all and it now runs very well, in fact will pull to the redline without missing a beat. Now the problem I could use advice on: the big one is when riding it there is a noticeable whine from the gearbox. Never having owned one before could somebody let me know if this is normal or maybe a gearbox bearing or something. It goes into all the gears really well, up and down the box and finds neutral okay. The other noise is the clutch at tickover. It is very rattly although it is adjusted correctly, and work well. These noises are unnerving and I wonder should I be using the bike as it may be causing damage. Any help would be appreciated. Cheers.

215

CB750 / Cylinder 2 not running (CB750F2)

« on: April 18, 2014, 05:02:31 PM »

Can anybody give me some pointers about cylinder 2 not running (CB750F2), have run out of ideas. Bike has been stood for a number of years. Have cleaned the carbs (although they were clean already), have replaced the float valves and set float heights (not sure if I have done this right as the manual does not even mention it), replaced the accelerator pump diaphragm, fitted new plugs etc. Engine fires up on the choke but cylinder 2 stays cold, does not cut in on higher throttle either. No.2 spark plug does not appear to be wet with petrol. Any ideas where I go from here, its bumming me out carbs have been off over and over. HELP!

216

CB750 / Carb repair kits for CB750F2

« on: April 06, 2014, 11:07:12 AM »

Hi. New to the forum so hello to everybody. Not used the forum before so forgive me if I post wrongly. Will soon get the hang of it. Quick question, am trying to get 4 carb repair kits for the CB750F2 (1978) as you probably know they are listed as unavailable. I can get a kit for the 750K that looks the same, but there are two different ones, the 77 & 78. will either of these kits do the job. Many thanks.