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Topics - FATAL

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CB750 / 750F1 breather plumbing

« on: August 17, 2008, 02:17:16 PM »

my 1976 750F1 has a breather chamber (part no: 17262-392-00) situated next to the battery and rear of the air filter. There appears to be a number of pipes that attach to this unit. I have identified the drain on the bottom , the top connector seems to attach to the top of the air filter box, but there is another pipe just above the drain hose, I dont know how long it should be, or where it connects to.
It is so long since I did anything to this bike, and even longer since I pulled it apart I now seem to be having a number of senior moments.

I'm thinking that the pipe may connect to the crankcase breather at the rear bottom of the crankcase, if so the breather pipe that leaves by way of the rear of the rocker cover then just hangs loose down by the swing arm, am I correct? I somehow doubt it.
My other concern is that the sponge breather element has perished with age and is now unavailable, any suggestions for a replacement?

Is it feasible to discard the breather element unit, seal off the connector on top of the air filter box, but then where do the crankcase breather tubes route to. I'll be most obliged for some help on this issue as plumbing is not my forte.

CB750 / tyre size ?

« on: December 06, 2007, 05:27:38 PM »

I'm considering fitting Dunlop TT100 K81 tyres to my F1 when the rebuild is finished. Whats the best size; 4.25 x 18 rear, and 4.10 x 19 front, or should I go smaller ie; 3.60 x 19 front and 4.10 x 18 rear

As the standard size is 4.00 x 18 rear, and 3.25 x 19 front, is the gearing affected, will the speedo be way out?

CB750 / wheelbuilder

« on: November 02, 2007, 09:50:05 PM »

Can anyone reccommend a good and preferably cheap wheelbuilder in the merseyside/south lancashire area ( I live near to St Helens). I am considering having the wheel rims rechromed and stainless steel spokes laced in. I know replacement rims are available but I'm under the impression rechroming may be cheaper.

What have people done to their wheel hubs? polished, powder coated? I'm wondering about using silver Hammerite smooth, any suggestions gratefully accepted.

CB750 / Taper roller bearings

« on: October 22, 2007, 06:20:33 PM »

I finally got around to fitting taper roller steering head bearings to my F1, but the steering stop lugs are a bit too low to engage with the stop on the head.

I assume this is because of the large thick washer that is fitted at the bottom of the stem, and then the rubber dust seal. The original bottom washer is very thin, and I'm thinking that if I refit a standard size (thin) washer instead of the very thick one then all should be tickety boo.

Has anyone had similar problems when fitting these bearing kits?

P.S. this restoration project seems to be taking forever!

Misc / Open / Was it any of you lot?

« on: September 11, 2007, 07:13:00 PM »

Yellow CB750F1 seen on A57 near M6 Warrington area this afternoon about 3pm ish, heading towards Irlam. It looked in really nice order, would liked to have stopped for a chat, but I was in firms car going into warrington. it's the first F1 I've seen on the road for years.

Misc / Open / Chromer in north west England ?

« on: September 04, 2007, 05:42:08 PM »

Can anyone reccommend a good chromer in NW England

I used a bloke near Altrincham a few years ago but lost his details.

CB750 / steering head bearings

« on: October 08, 2006, 12:25:32 PM »

has anyone used the tapered roller bearings to replace the standard loose bearings and cups?
Were they easy to fit?
Any noticeable improvement in handling?

CB750 / New kid on the block

« on: October 06, 2006, 10:26:24 AM »

Hello everyone, I'm new to this site. I've just been given a 1975 CB750F1 by a mate who works overseas and hasn't the time to sort it. It has been stood in his damp garage for the last 9 years or so as the chain snapped and cracked the crankcase (happened to my K6 back in1978).
I have previously owned two K6's and an F2, albeit about 20years ago. I currently ride a BMW R1150GS and a Harley 1200 Sportster. I have taken this F1 on as a restoration project, with a view to riding it for a few years. I have done several BMW restorations, and a BSA, but this is my first Honda. I intend to get the bike within as near original spec as reasonably possible, but concours is not for me. I like to use stainless steel fasteners, goodrich type hose, and decent aftermarket shocks.
I am aware that David Silver Spares is a good source for parts as is the Dutch company CMS, can anyone reccommend any others in the UK, and are there any bike breakers about who specialise in old Hondas?
What would be a fair price be for a replacement engine as I'm not certain a rebuild is a practical proposition on this bike?