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Topics - Jontyp

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Project Board / CB750F2 Race Replica

« on: July 14, 2016, 08:35:45 PM »

Well I thought I should update with what little progress I've made with my project.

The end.

Well, nearly. Anyway, it started out as a '78 F2 and in all honesty I'm not sure I had a fully formed plan at the start. I wanted to create a bigger version of a Yoshi 460/4 I built back in 1981/82. I've got it completely stripped down and identified parts that will need to be replaced (for example the rear brake master cylinder is knackered etc etc). I managed to get hold of an alloy fuel tank, oil tank and fairing from a P&M race bike from the same era. The fuel tank was made by the same guy who made P&Ms tanks and has been modified for extra range for the IOM and the fairing has a letter box opening for an oil cooler. I've also just got a replica P&M seat from Ragged Edge Racing (highly recommended btw).

So, overall, the plan is forming to build a roughly period replica endurance racer (so need to get lights in or on the fairing nose), tune the motor (maybe Wiseco 836, new cam, CR carbs etc), oil cooler, clip-ons, rear-sets and so on. Everything that isn't right will be reworked, repaired or replaced. No urgency but I'll keep posting in here and asking questions of the great and good as I go along.

Cheers

CB750 / New discovery

« on: June 02, 2016, 10:47:20 AM »

Well, who knew that you had to drain the oil to change the front sprocket. How weird. Unless, of course, I'm being ridiculously stupid (it wouldn't be the first time). I don't need to change it by the way, I drained the oil in prep for getting engine out and took that side cover off just for giggles. Lo-and-behold, there's a load of gear change mechanism in a gasketed cavity outboard of the sprocket.

On a separate note, that motor is a bit of a lift for one person isn't it. It was like doing the "Atlas Stones" lift getting it onto my work bench

CB750 / The Strip-Down Continues

« on: May 15, 2016, 09:43:05 PM »

Well, the F2 is rapidly becoming a collection of its constituent parts. Aside from the butchered fork sliders I've found the rear brake master cylinder is also totally goosed. There's loads of other bits I want to replace (coils, cables, most seals and bearings etc etc). On the up-side I did a compression test on the motor (admittedly it was a cold motor) which showed readings all around 160psi and within 5% of each other. So it seems the motor is reasonably healthy. Which is a shame as it will be coming apart anyway

CB750 / Uncovering old Bodgery

« on: May 08, 2016, 09:53:15 PM »

Well I've started to strip the CB down and make a list of parts that I need to replace rather than those I'll want to replace. Looks like someone had trouble getting old fork seals out, not once, but twice. Why the hell would you do the same thing the second time. It's not as if it's a particularly difficult job. So new forks are on the list now aswell. The stanchions are toast aswell anyway.

New Member Introductions / Hello from sunny Shropshire

« on: April 25, 2016, 12:13:18 PM »

Hi All
Just joined as I've just won a CB750 on fleabay. It's gonna be a tinkering project over an indeterminate period of time. I've had bikes since I left school in 1978 and my first CB was a lovely little 400/4 that I did a 460 Yoshimura tune on. Probably the best fun I've ever had on a bike.
Anyway, I'm sure I'll be along to pick peoples brains and maybe help some others if I can.
Cheers