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1  General Category / Tech Corner / Preparing the CB-1 for restoration on: August 30, 2018, 05:58:23 PM
Hey all,

I haven't been on here much recently, hope everyone is well.

I've not used my CB-1 much this summer apart from the odd ride to work, recently had a kid so time has been very limited! Insurance, tax and MOT is just coming up so I decided to take the bike off the road (SORN'd in the UK) to do some much needed restoration.

I was after some advice about prepping the bike for being laid up for awhile, looked online but loads of conflicting info:

- Tank: advice online seems to be either keep the tank full and add fuel stabiliser because of the amount of ethanol in modern fuels attracting water OR totally drain it and spray a bit of WD40 in. The inside of the tank looks good, no rust. I read horror stories of people draining the tank and it rusting. The tank is going to be off the bike on a shelf for awhile so I'd rather it was empty. What do you guys recommend?

- Carbs: I'm planning on draining them. I cleaned them up a few years ago and replaced the gaskets and O-rings. Don't want old fuel gumming them up.

- Ports: I'll stuff rags in the air box snorkles and exhaust to stop moisture getting in. I've also heard spray some oil down the plugs? WD40?

The bike needs a thorough going over, paintwork I did on the engine years back is wearing bad and an exhaust gasket is blowing so the system needs to come off. I'm going to use Pod70's excellent guide to do the valve clearances and the carbs need balancing. I bought the ABBA stand and front lift so the bike can be dissembled over time.

I was debating whether to drop the engine out to make painting it easier. Is it a tough job? I've read on here that there is a risk the mounts can crack.

Cheers!
James
2  General Category / Tech Corner / Re: Reprise of: New bike a Republican? (aka my bike doesn't lean LEFT). on: April 08, 2018, 07:46:21 PM
Hey guys,

Iíve got some photos from a couple of years back when I cleaned my carbs.

Have a look Bill and hopefully these will help identify the bystarter jet and hole, I think I can see what your talking about here - https://photos.app.goo.gl/mDV6YhUBkXIfyKOL2

If that doesnít link, itís a google images shared album - https://goo.gl/photos/QgXZQjFWEgxtf6Ns5 (some other carb and CB-1 photos on there too)
3  General Category / General Motorcycle Discussion / Re: Introduction on: March 26, 2018, 04:41:10 AM
Welcome!
4  General Category / Tech Corner / Re: Syncing carbs & adjusting idle mixture on: March 19, 2018, 08:17:59 AM
Excellent guide, thanks for posting it! I plan to have a go at mine in the spring, still haven't got round to trying to remove a stuck mixture screw on carb 4
5  General Category / General Motorcycle Discussion / Re: Gasket Adhesive on: February 26, 2018, 11:19:56 AM
Where do you guys get your rocket cover gaskets from in the UK?

I've noticed the OEM gasket doesn't seem to be available anywhere anymore and there was a long discussion on the facebook group over whether the chinese pattern rubber gasket's on ebay were any good. Also some disagreement on whether the NC23 gasket would fit.

I'm planning to check my valves at some point and have noticed a small amount of oil coming out of that drain hole in the side of the cylinder, so want to be prepared with a new gasket if necessary

Cheers,
James
6  General Category / Photo Gallery / Re: After 15 years of neglect, first ride! on: October 26, 2017, 04:31:35 AM
Very nice! Did you powder coat the frame or spray it? Looks great
7  General Category / Tech Corner / Re: Irregular ticking sound on: September 26, 2017, 11:34:41 AM
Ahh tightening the studs hasn't stopped the tick, but I will do as you suggest and drop the bottom rad bolts to get more access. If nipping them a bit more doesn't work them its probably burned up a gasket.

No big worries, I was planning on starting an overhaul this winter anyway and want to drop the system out to paint the engine and give it all a clean up
8  General Category / Tech Corner / Re: Irregular ticking sound on: September 26, 2017, 08:38:27 AM
I had the bike MOT'd last Friday, passed with no problems  Cheesy

The mechanic had a listen to the tick and he was pretty certain its an exhaust gasket leak on one of the inner two pipes. I managed to get a spanner on the suspect one and the studs were pretty loose. I put the system back on with copper gaskets around 10 years ago and they were tight. I'm guessing they've worked loose over time?

Anyway, I nipped them tighter but didn't want to overdo it. It hasn't fixed it the noise, so I'm guessing I'll need to drop the system out at some point and put in new gaskets. Do they normally fail after so many years?
9  General Category / Tech Corner / Re: Charging Problems on: September 13, 2017, 08:48:44 AM
I had a similar thing happen to mine a few years ago and it turned out to be the stator had burnt out on one of the phases.

Definitely check everything a_morti has mentioned first before going further. I'm not sure about the voltage either but if I remember, mine was reading fine on the resistances (one was a little high and that turned out to be the duff one). If you do discover you need to buy a new stator, I got mine from here - http://www.electrexworld.co.uk/acatalog/G17.html and its been fine
10  General Category / Tech Corner / Re: Irregular ticking sound on: September 13, 2017, 08:43:53 AM
Thanks for all the info guys. Those instructions look excellent Pod_70, I will have a proper read of them and decide whether its something I want to attempt or have the time for - I'm about to become a dad so time has been pretty limited recently getting stuff ready, sadly the bike hasn't done many miles this (wet) summer.

Hopefully it is valve clearances and not the starter clutch (the ticking seems to be coming from the top of the engine) but I will check the exhaust manifold studs aren't loose though, cheers for the tip a_morti!

I also have the air mixture screws from China to test out but just need to find 5 minutes!

11  General Category / Tech Corner / Irregular ticking sound on: September 11, 2017, 05:17:12 AM
Hey all,

Recently I've started noticing my CB-1 has developed this irregular ticking sound when warming up. At first I thought it was the pump, but its coming from further forward, sounds like up near the top of the engine. It gets faster if you rev the bike. I can't say for sure, but I haven't noticed it once the bike has warmed up.

I started up the bike this weekend and it was noticeable, which has got me wondering whats going on. I haven't had time to use the bike much recently, but did an oil change a few weeks ago and have noticed it since then.

The valve clearances are well overdue being checked, could that cause this kind of noise? up to this point the engine has been golden, so I'm hoping it isn't anything more serious. Also, I've never done valve clearances / shims before, is it straightfoward or should I get a mechanic to sort it?

Cheers,
James
12  General Category / Tech Corner / Re: Pilot Idle Mixture Screws on: August 08, 2017, 08:12:33 AM
If the the outer air screws be removed in situ that is great as I'll unscrew one to compare without having to dismantle the bike.

I didn't have any correspondence with the seller directly in China, I just ordered the screws though AliExpress here: https://www.aliexpress.com/item/Keihin-the-carb-air-screw-for-a-variety-of-carburetor-CVK-CBR-CB-1-GR-PD26JS/32543105126.html?spm=2114.search0306.4.16.n2cHww

The description reckons they fit CBR + CB-1, but it could be wrong. I found a few other kits however on ebay (aftermarket from China) and compared the measurements which all matched, so I took a risk and bought some.

I've no idea about the 2 screws that are a different size though, mine might be the same but it was a few years ago I had mine apart so can't remember.

Silly question but do you know if I'd need to drain the fuel from the carb before removing the air screw?
13  General Category / Tech Corner / Re: Pilot Idle Mixture Screws on: August 08, 2017, 03:47:07 AM
Mines a Japanese import and it's got 2 different size mixture screws, unless someone's replaced them.

That's interesting on the different lengths on your Japanese model. The manual mentions the Canadian model has different lengths, but says nothing about the Japanese spec (you'd think by the fact they've pointed out the Canada model is different, that would imply the Japanese model had same length screws).

Anyway, the screws arrived from China yesterday, they look good quality and the guy sent me an extra one for free, but I've no idea if they are gonna fit.

Busy at the moment (first baby on the way!) but will report back when I've had a chance to pull the carbs and removed an existing working screw to compare. If they are the right fit, I'll then strip down carb 4, get some heat on it and finally try to remove the stuck screw  Cool
14  General Category / Tech Corner / Re: Minor coolant leak on: July 28, 2017, 04:29:03 AM
Cheers for the info and links! I'll get those O rings ordered.

Good shout on shortening the hose, i'll see if it has enough slack to trim
15  General Category / Tech Corner / Re: Minor coolant leak on: July 27, 2017, 10:49:33 AM
Thanks for the info! Sounds like it should be an easy fix i'll do soon once my carb air screws have arrived. I don't suppose anyone knows the size of the o-rings?
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