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Messages - Winterfield

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1
CB500/550 / Re: Crankcase main bearing letters - doubting myself!
« on: January 22, 2021, 08:33:11 PM »
This is a timely thread, I'll be doing this shortly for my 400.

One thing that's bothering me: is it a safe assumption that the crank case stamped measurements are still accurate? Or is it better to measure?
What about the crankshaft - is safe to assume it's the same as it was stamped too?

2
CB350/400 / Re: silencer
« on: August 12, 2020, 07:59:40 PM »
Thanks for that Andy.

My bracket is a separate piece which bolts onto the frame, but the bolts to the silencer on both our bikes look like they're sticking out at a jaunty angle. I think I might just live with it, and use some loctite to try and ensure they don't come undone.

3
CB350/400 / Re: silencer
« on: August 12, 2020, 11:31:13 AM »
Glad to know I wasn't the only one who had some trouble with it.

Instead of buying a new gasket, I ended up getting some high temperature tape which I'll use to build up a perfectly sized shim.

I'm interested in what your bracket looks like, and how it fit into the silencer. There's still a good chance I've just oriented one or the other incorrectly.

Definitely agree though, it looks much better than what I had on before too... a 'shorty megaphone' from ebay.

4
CB350/400 / Re: silencer
« on: August 11, 2020, 07:31:39 PM »
I bought a full exhaust set from DSS which would have included one of these. I 'had' to return the silencer for a new one as it came dented, but DSS were quick to replace it.

Something to watch out for is the collector to silencer gasket wouldn't fit the silencer, and I ham fisted it and destroyed the gasket. Perhaps there's a trick to skimming them down?

I also had trouble fitting the mounting bracket - it fit loosely, but the silencer didn't align with the bracket. I'm not sure I got it right. The bracket won't fit on in the gap on the top side of the silencer, so this was the only way I could see to fit it.


5
CB350/400 / Re: Oil control rings too big for bore
« on: August 07, 2020, 07:15:44 PM »
Dave, I'd be interested in knowing what the difference is between the two sets of rings, if you manage to measure them. I tried to figure it out with my non-existent machining skills, but couldn't measure accurately enough to see exactly what was wrong.

I ended up just using the old rings - not ideal, but I just want to get this engine running while I rebuild a second engine I have (this time properly... I hope).

6
CB350/400 / Re: Oil control rings too big for bore
« on: August 06, 2020, 04:10:00 PM »
Yup, and a good thing to check... the first thing that I did when they didn't fit was hit youtube to see how I'd cocked it up :)

7
CB350/400 / Re: Oil control rings too big for bore
« on: August 06, 2020, 12:26:43 PM »
Wavy center spacer ring first, then bottom rail, then top rail. Center spacer is butted correctly, and ring gaps staggered.

8
CB350/400 / Oil control rings too big for bore
« on: August 06, 2020, 08:57:26 AM »
Hi all,

I bought some new piston rings from cruzinimage for my 400/4 (3 piece oil control rings). I've checked the ring gaps for all the rings in the barrels, and they measure up fine (usually .35).

When I try to install the pistons on the bench, I can't get the piston past the oil control ring. I've confirmed this by removing the other two rings, and can't fit the piston in the bore with just the oil rings.

It looks like the same problem mentioned here: http://www.sohc.co.uk/index.php/topic,12513.0.html

Their solution was to just use the old rings, which is certainly an option for me. But I'd like to understand if anyone else has come across this, and how they resolved it?

Cheers

9
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.

10
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.

11
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. https://goo.gl/maps/wDhCAmwLHBdA2LBG6

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.

12
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.

13
So after finally figuring out the right Google search terms, it looks like this is a solved problem: http://forums.sohc4.net/index.php/topic,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.

14
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?





15
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 (https://www.classicbikeshop.co.uk/short-universal-megaphone-silencer.html).

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?
 
Cheers.

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