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1  General Category / Tech Corner / Re: CB-1 oem rear shock on: November 20, 2017, 05:15:11 PM
Was just looking back over this thread as I got my CBR1100XX shock installed. As expected, it has a lighter spring than stock, but so far it seems usable. I can't find a C spanner to add preload, but that's definitely the first thing it needs as it drops a lot coming off the stand.

I haven't yet noticed it bottom out but I've only ridden round town, this may be because it also has a longer stroke than stock. I haven't measured that scientifically, but for sure the bike starts at higher ride height (wheel nearer ground on centre stand) and still goes down to around about stock level at full compression. Seems legit that if you have more wheel travel, you can use a softer spring?

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I wondered idly if you could easily extract the hydraulic preload adjuster off a VFR750 shock.


According to the Penske site, that shock has a similar spring rate requirement to the CB-1, so if I could get the adjuster and the spring off a cheap one and fit it to my Blackbird shock, I could have my own cheap version of your Frankenshock.
2  Classifieds / Wanted / Re: WTB Pulser Coil and gasket - HELP! (SF Bay Area) on: November 18, 2017, 03:03:48 AM
The pickups can indeed fail at high mileage although it's relatively uncommon. You'll often find them in UK. Pod70 may be able to help.

The gasket is identical to cbr600f1.
3  General Category / Tech Corner / Re: CB-1 restricted on: November 09, 2017, 01:48:07 PM
It's exactly that, a washer fitted between the engine and the carbs. 35mm outer, 17.5 inner and a 3mm additional hole to allow a little extra through.

The cb-1 runs surprisingly well restricted in this way, you probably won't notice it until you remove it and even then it's mostly just a bit of extra top end which you won't notice most days normal riding.
4  General Category / Tech Corner / Re: CB-1 restricted on: November 05, 2017, 05:32:02 PM
Hi mike!
The restriction is very simple. Remove he carbs, and if it is still restricted there will be a metal washer in each intake port to reduce how much mix can enter the cylinder. Remove that and you're done.
5  General Category / General Motorcycle Discussion / Re: Aftermarket headlight options; safety and style on: November 04, 2017, 05:58:36 AM
Two small headlights tend to be disappointing as the reflectors aren't big enough. Not to mention that extra load on an already marginal charging system. There are plenty of aftermarket bulbs such as night breaker which will provide a decent improvement.

You may also want to consider a more modern headlight such as from an sv 650 or recent hornet. The glass is clear which will eat less of your light output.

If you're stock lens is dull, you can get various polishing products to tidy it up
6  General Category / Tech Corner / Re: CB 1 no electrics on: November 01, 2017, 04:39:51 PM
Should start with stand down if in neutral. If it doesn't, then you may have a faulty neutral switch, sidestand switch, clutch diode, or clutch switch, or something else in that safety circuit.

Leaky carbs isn't a big deal:
http://litetek.co/Carb_Kit_Honda_CB1_NC27.html

These are better than new.
7  Classifieds / Wanted / Re: cb1 on: October 30, 2017, 08:14:27 PM
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F201178729527
8  General Category / Tech Corner / Re: CB 1 no electrics on: October 27, 2017, 04:03:27 PM
New battery will help, after that you're into carb cleaning, new plugs, etc etc.

Give it a bump start off a car battery if you have the possibility to do so.
9  General Category / General Motorcycle Discussion / Re: Honda.....you'd better start listening - Yamaha XSR700 Coming to 'Merica in 2018 on: October 19, 2017, 02:55:13 PM
In general it's easier to get engines with smaller capacity per cylinder through regs, plus the 400sf has VTEC and efi... I can't believe they couldn't strap a catalyser on it, run it a bit leaner in the two valve range, and sell it anywhere in the world, if they thought it would sell.

In Europe the learner regs restrict you to a bike under 47hp, which must also be under a set power:weight ratio (the Duke 390 is under 47hp but has to be limited as it's so light), the bike must also have a design power rating not more than 94hp if it is to be limited to 47hp.

On that basis you see the current generation cb500 with 47hp although the old generation had around 65hp. You also had the early nc700 with 47hp, although they've now upped it to 750 and released it with full power. Ever wondered why the Africa twin with its 1000cc twin makes 94hp??

Anyway... Considering all the above and that no bike will be faster than any other in the learner licensing arena (unless one is over the minimum weight) - you may struggle to get people to pay may for a 400/4 than a 500/2.
10  General Category / General Motorcycle Discussion / Re: Honda.....you'd better start listening - Yamaha XSR700 Coming to 'Merica in 2018 on: October 19, 2017, 01:26:44 PM
They are still making the 400sf for the Japanese and Asian (and maybe Australian?). The most recent model got cool wheels, they've had abs, vtec and Efi for a little while, they have the same calipers as a 929/954 generation litre bike. I'd say there's enough high tech there to be getting along with, even if it's missing the cam gears?! Even if you don't like dual shocks they are reservoir type which has some bling factor.
11  General Category / General Motorcycle Discussion / Re: Honda.....you'd better start listening - Yamaha XSR700 Coming to 'Merica in 2018 on: October 19, 2017, 08:14:59 AM
You say that... but look at all the small and mid capacity bikes Japan is shipping lately, all right around 30-40hp.

CBR300, CBR250RR,  ZXR300, GSXR250, R3
CB300F, rebel 300, Z3, MT03

Lower tech than the 80s, but they're not built for people with money who couldn't have bigger, they're built for more budget conscious people.

Plus the 125 market is as alive as ever - just look at how well the Grom is doing worldwide. The sports 125s are kind of a joke compared to the 2T of old, but they're still there: CBR125, R125, GSXR125. Have you seen the new CB150R yet??

Then there's a raft of 500s, as there kinda always has been. And the Europeans with Duke/RC 125/390, BMW310. There's a 40hp 400cc Ducati Scrambler too.

I think times are better now for beginners and for those who don't feel they need >50hp than they have been for a very long time. In the 80/90s it was due to the 400cc limit in Japan. Nowadays it's due to a 48hp learner limit in Europe. You're welcome Smiley
12  General Category / Tech Corner / Re: Trouble starting - Power loss - Cut off on: October 10, 2017, 06:27:19 PM
Good find!
I once unearthed a dead spider from same location which had been causing an intermittent circuit. Took a while to find that one.
13  General Category / Tech Corner / Re: Front seals keep leaking on: October 03, 2017, 04:29:11 AM
And try allballs seals, they are triple lip and do a bit better. Won't fix an underlying issue though.

I guess the fork lowers could wear with enough miles especially if the oil wasn't refreshed regularly enough and if the bushes were worn. Don't think I've ever seen it though
14  General Category / Tech Corner / Re: Front seals keep leaking on: October 03, 2017, 03:20:52 AM
Have you replaced the bushes yet? As they wear, you can get more play in the suspension which will put undue stress on the seals.

Also be sure you're not over filling the oil as this will stress the seals.
15  General Category / Tech Corner / Re: Trouble starting - Power loss - Cut off on: October 02, 2017, 09:04:36 AM
Considering you've just had a dead battery, I'm going to go with charging system, as over voltage can fry them while under voltage can leave them dead too. Cdi could also be gone, but if so then as a symptom of charging system.

This is going to require some actual mechanic work to solve. GET A MULTIMETERS and diagnose it properly before swapping out parts and hoping again. Like I mentioned way up there.
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