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1  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
2  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
3  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?
4  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
5  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!

6  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
7  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?
8  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
9  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
10  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?
11  General Category / Tech Corner / Minor coolant leak on: July 27, 2017, 08:16:12 AM
Hey,

I've got a really slow coolant leak coming from a couple of places and had a couple of questions:

- The thin hose that runs from the bottom of the coolant reservoir to the thermostat housing, it weeps from the bottom point where the hose goes onto the coolant res tank nozzle. The original clip is still on there but has probably worn. The end of the hose is also a bit tatty. Is it worth replacing the entire hose, or just the clip? If so does anyone know what diameter hosing it uses and can I use something aftermarket? It doesn't look like that should be a specific motorcycle thing

- When the bike sits for awhile without being run, I get a bit of coolant leaking out of the right angle metal coolant pipe. I see the o-ring inside fails if it dries out, is it as simply as undoing the clamp holding it in, and replacing the o-ring inside? What size O-ring too?

Cheers,
James

12  General Category / General Motorcycle Discussion / Re: Carb model or alternative on: July 22, 2017, 01:59:37 PM
Hey Nick,

I've been looking into the CB-1 carbs for awhile as whilst stripping mine down for a clean, I discovered one of my pilot air mixture screws had been murdered by a previous owner and was totally stuck. I wasn't able to free it and put the carbs back together after cleaning for a tune as I needed it for commuting. I managed to get them relatively balanced but its still a bit lumpy on idle as that one screw cannot be set.

To my knowledge the carb model is unique to the CB-1 - they are Keihin VG06 and the genuine Honda pilot screw set part no. is 16016-KAF-670. These are discontinued everywhere I've looked and contacted. Apparently the carbs share some parts with the Honda CBR600F1 Hurricane, but they are not totally interchangeable.

I've been posting up my findings on this thread on the forum http://www.hondacb1.org/forum/index.php/topic,5337.0.html

Last week (after a lot of searching) I found an online shop in China making aftermarket pilot screws that allegedly fit the CB-1 carbs. I don't know the measurements of the original screws (no info online) and mine are still in the running bike, so I took a chance and ordered x4 as they're not expensive. They have been dispatched but will take awhile to arrive. The link to where I found them is in that thread.

Once they arrive I'm going to remove my carbs again, strip them down and from advice on this forum use a lot of heat to try and free the stuck screw. Hopefully the new aftermarket ones will fit and I will be able to get my bike idling properly.

The only other option I know of is to find a second set of CB-1 carbs but I haven't seen any going recently in the UK. I vaguely remember someone mentioning a mod to fit Honda CBR400 carbs, but not sure.

There are also some aftermarket FCR racing carbs out there, but they cost over a grand most places I've seen 'em!  http://www.frankmxparts.com/Keihin-FCR-33-flatslide-racing-carburetors-Honda-CB-1-CB1

Good luck!



13  General Category / Tech Corner / Re: Pilot Idle Mixture Screws on: July 21, 2017, 08:42:05 AM
Vessel screwdrivers arrived today, the quality looks really good. Will try them out this weekend as going to do a few maintenance jobs on the bike.

Also I've just ordered x4 air screws from that AliExpress seller in China for princely sum of 7.06 (inc delivery). It's a punt but if it works its a good source for anyone needing these elusive screws in the future  Cool

Delivery time is 20-40 days though, so watch this space!
14  General Category / Tech Corner / Re: Pilot Idle Mixture Screws on: July 20, 2017, 08:12:57 AM
Cheers guys. I had a look in the workshop manual last night and there was a note saying 2 air screws are shorter on Canada models apparently (can't remember if it was the inner or outer 2). I wonder if that means they are all the same length on the Japanese spec.

I can't find another set of carbs in the UK at the moment so I might take a gamble on those screws from aliexpress. They don't cost a lot and you get two in a pack, so I won't be too horrified if they don't fit! I'll report back

Nice on the webbikeworld link ModerateFkr, I read that before buying mine.

I went for the Vessel Megadora P1,P2,P3 set too a_morti, after reading this - http://www.webbikeworld.com/motorcycle-tools/jis-screwdrivers/vessel-jis-screwdrivers.htm
15  General Category / Tech Corner / Re: Pilot Idle Mixture Screws on: July 19, 2017, 08:23:13 AM
Hey all,

I've been doing more searching and had turned up various jetting kits but nothing with the air mixture screw...until I found this!

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

And also this kit made in China:

http://www.ebay.co.uk/itm/Carburetor-Repair-Kit-Needle-Main-Jet-Set-for-HONDA-CB400-CB-1-400CC-/112454412676?hash=item1a2ece2984:g:eUoAAOSwJ4hY~Tsq

The dimensions seem to check out between the two sites, except the AliExpress one seems to have a longer head.

Without knowing the actual dimensions of the stock screws, I can't say for sure if these are right (or if the inner two carb screws are different to the outers).

I'm planning on pulling my carbs and splitting the bank later in the year to see if I can remove the old screw, but trying to avoid having to fork out for a whole 2nd set. I'll get some measurements then unless anyone has carbs loose at the moment?

Also, I just ordered a set of JIS too   Grin

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