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Messages - Winterfield

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CB350/400 / Re: Carb-to-head manifold "insulator" removal
« on: June 08, 2020, 02:46:21 PM »
I take it the engine is still in the frame? I couldn't get my impact driver (like the one pictured above) to get them out, there was no space to swing a hammer.

What I ended up doing was to repeatedly use penetrating oil on the screws over a period of days. Then I used the bit from my impact driver, which was quite a large diameter, along with an 8mm socket in a wrench. The bit went into the socket, and I used the leverage from the wrench while pushing hard down on the wrench head to stop the bit from jumping out of the screw. Much to my surprise, the screws came out without damage.

I think the trick is to find the perfect fitting driver, more likely than not, JIS as mentioned above.

CB350/400 / Re: Cam chain tensioner bolt
« on: June 07, 2020, 04:42:15 PM »
I would be very interested to hear about your experiences getting the broken one out. I have three sets of engine casings, all of which have broken tensioner bolts stuck in them.

My plan is to use a left handed drill bit, and to try and have a collar machined to use much like a self centering drill bit.

Misc / Open / Re: Motorcycle Sat Nav - Does Anyone use one?
« on: June 04, 2020, 03:49:06 PM »
I use a Garmin Zumo myself, a 345LM. I like it, but it has betrayed me more than once. I think there's something I've messed up, but when it re-routes because you go slightly off course, it decides that you're now going the adventurous route. It's how I ended up taking this narrow coastal road through Manish, instead of the slightly less narrow road around the north of Harris.

I also have a Quadlock for my phone. I've found the mount itself to be great, but in the rainy weather my phone's touch screen goes crazy, and is unusable (even without gloves).

One neat thing that Quadlock have just brought out is a wireless charging mount, which I'll be looking into.

Deano, the fast idle was adjusted to have a huge gap, so I don't think it was even affecting the throttle.

I suspect that K2's post is exactly what's happening, and I saw a similar post.

Will report back with details on how to recognize and fix the issue (assuming I manage to fix it).

Nice idea on the plumbing olive. I could only find 12mm microbore tubing, but the olives will be slightly larger diameter, and pliable.

So after finally figuring out the right Google search terms, it looks like this is a solved problem:,100144.msg1117373.html#msg1117373

Now to solve the next problem: it turns out that finding .45 bullet casings for this repair is not as simple in the UK as it is in the US.

CB350/400 / Carb questions (or: How badly did I stuff up this time?)
« on: June 01, 2020, 07:17:34 PM »
Hi all,

I've managed to get my 400 up and running after much work on the body, repainting etc.

Today was a mixed bag. I just couldn't get the bike to start and idle. It would start very briefly with full choke and some throttle, then it would die. It turns out you need a fair old whack of fuel in the tank to fill the floats, and they just weren't filling up.

Once I got the fuel situation sorted, I managed to get it to start and idle with full choke (very smokey), then if I turn the choke off, it shoots up the RPM (without any throttle input) at which point I hit the kill switch. The idle screw is all the way out, and I don't -think- there are any obvious air leaks, because I tested with some squirts of carb cleaner around the place.  What I suspect is that the slides are too high, and are letting in too much air at idle. If I understand it, it's probably best to use the balancing screws to have the carbs quite low (but equal), then use the idle screw to lift them if it idles too low?

Once it got a little late to be rev bombing the neighbourhood, I turned my attention to a spare set of carbs I have. While dismantling, I may have used a tiny little bit too much force trying to get the main jet out.

I managed to create a couple of hairline cracks in the carrier for the main jet. They don't go down too far, maybe 2-3mm. Is this likely to cause any issues?

CB350/400 / Need to rejet carbs for megaphone style exhaust?
« on: May 27, 2020, 09:36:43 AM »
Hi all,

Due to budget constraints I've opted to get a cheap megaphone silencer from Classic Bike Shop (

Will this be likely to change the back pressure enough to warrant re-jetting the carbs? I'd prefer not to, with the intention of buying a replica 400 silencer when (if?) they become available again. Would adding a baffle change the back pressure?

Project Board / Re: Winterfield's first project (400/4)
« on: May 25, 2020, 06:32:54 PM »
My experiments on some of the tape did show damage from petrol, and slight damage from thinners.

It didn't turn into goop, but I suspect with enough petrol it would have.

Unfortunately, the loom is on the bike now, and I'm pretty reluctant to take it off and redo it at this stage. But it's good to know:

Avoid this: (Self Amalgamating Tape 10m Roll by electrosmart®)

Project Board / Re: Winterfield's first project (400/4)
« on: May 23, 2020, 12:16:17 PM »
Thanks for the heads up mattsz, I'll go and do some experiments with the tape I have to see if it's affected.

Project Board / Re: Winterfield's first project (400/4)
« on: May 22, 2020, 11:03:48 PM »
Thanks again Julie, for your support!

Despite my work situation, I have been attempting to keep the economy alive by spending a small fortune at Silvers. Hopefully by the end of next week I'll having a running, riding bike.

Project Board / Re: Winterfield's first project (400/4)
« on: May 22, 2020, 11:01:07 PM »
I got so close to having a complete looking bike, I couldn't resist putting the tank, sides, and seat on to see how it looks (before and after):

Project Board / Re: Winterfield's first project (400/4)
« on: May 22, 2020, 10:58:08 PM »
The silencer was also a little ratty, so I made do with a £36 ebay generic one.

Project Board / Re: Winterfield's first project (400/4)
« on: May 22, 2020, 10:56:31 PM »
Moving on to the exhaust. It's in pretty bad shape, and its not something I can fix personally (without a welder and some skills). The pipes are in bad enough condition that I don't think it's worth trying to restore them. Unfortunately, some uncertainty with my work situation means there isn't money to splurge on a repro set of pipes. I also missed out on a reasonable condition set here in Edinburgh on ebay, which went a little out of my price range.

That pile of rust is just what shook free of the collector. There was more in the pipes which made its way out later.

The collector was almost rusted away, with presumably just the chrome on top surviving (to an extent).

So, with the above concerns, I attempted to patch the collector with some ebay special exhaust repair tape. It did not go well.

Attempt number two was to try heat wrap, with some exhaust repair foil underneath it where necessary to try and make it air tight. I like how it turned out, sort of cafe racer style. I guess that makes this a resto-mod now.

This stuff is made of basalt fiber, which is fairly forgiving to wrap, presumably due to the weave. It does shed, and itches like hell, so wear gloves etc.

The eagle eyed among you will note that the exhaust collars are on backwards, and should be sticking out a little from the joints on the end.

Project Board / Re: Winterfield's first project (400/4)
« on: May 22, 2020, 10:38:02 PM »
Now onto the electrics.

The loom was in generally good shape, with a few dodgy splices, but the wrapping was getting a bit tired.

I rewraped most of the loom in self amalgamating tape. It's not stock, but it felt more robust and generally tougher than a thin tape layer.

And with the wiring loom in-situ:

Project Board / Re: Winterfield's first project (400/4)
« on: May 22, 2020, 08:59:03 PM »
The dials were next up. They were a bit ratty, but nothing so bad a bit of a strip, clean and repaint couldn't fix. The faces looked reasonably good, and I didn't want to replace with newer vinyl faces because I suspect they were originals.
I did a bit of damage on the tacho when I tried to clean up the rust stain from the screw. I was clever enough to not use a solvent, but still scuffed it a bit with the dry rag I used. I left them alone after that.

I managed to do a bit of a batch painting session, but forgot to do the brake calipers :(

I made a (really dodgy) lazy susan to try and speed up the painting process, and make it easier to paint without touching the pieces.

Throughout the project, I've been playing with different painting techniques. Initially, I used rattle can primer and then 'tough' paint. This time I thought I'd try a spray gun. Learning all about painting with a spray gun is fascinating, and I recommend it. I'm still terrible at it, but learning how to configure the paint gun, what consistency paint, air pressure, paint volume etc. is great. The primer didn't go on too well, but the basecoat and clear lacquer went on perfectly.

The restored dials back on the bike:

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