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Messages - Rex

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1
British Bikes / Re: Firing on one cylinder only
« on: June 13, 2021, 02:24:25 PM »
Quote from: iansoady on June 13, 2021, 12:09:59 PM
Quote from: Rex on June 12, 2021, 07:18:46 PM
This may seem an off-the-wall question, but are you running a Boyer ignition unit and is the battery fully-charged? It's a well-known characteristic of Boyer-equipped bikes that with a low-ish battery voltage they'll only fire on one cylinder in use.
I've never heard of this and can't see how it can be true as the Boyer is a wasted spark system which fires both cylinders at the same time.....

I've personally experienced it when a rectifier died and stopped the battery charging on an old T120V I had. That said, it's a recognised (at least, to me) symptom when a bike is fitted with a Boyer.
After all, when the battery voltage is reducing the wasted spark system will keep on working....until the voltage is too low, then it won't.

2
British Bikes / Re: Firing on one cylinder only
« on: June 12, 2021, 10:28:00 PM »
Rocker covers upside down?? Is it only firing on one all the time, or now and again?
Put a voltmeter on the battery and read the voltage with the engine running. Blip the throttle and check that the voltage actually rises.

3
British Bikes / Re: Firing on one cylinder only
« on: June 12, 2021, 07:18:46 PM »
This may seem an off-the-wall question, but are you running a Boyer ignition unit and is the battery fully-charged? It's a well-known characteristic of Boyer-equipped bikes that with a low-ish battery voltage they'll only fire on one cylinder in use.

4
British Bikes / Re: Notchy gearbox
« on: June 09, 2021, 09:23:00 AM »
The length of the clutch push-rod has no bearing on the rear wheel rotating in neutral as the mainshaft (through which the push rod goes) is rotating too.
A quarter turn would be a miniscule dimension anyway.

5
British Bikes / Re: Notchy gearbox
« on: June 08, 2021, 06:54:13 PM »
If it's in neutral clutch drag doesn't come into it. The rear wheel always rotates when on the stand because of oil drag between the main shaft and sleeve gear.
It's personal choice, but I've always rated the light and short Triumph gear lever action. Is this a recently-purchased bike?

6
Autojumble / Re: velocette gtp
« on: June 08, 2021, 08:25:50 AM »
I'm sure I read somewhere about someone utilizing a hub from some Jap trail bike (DT 175, maybe?).
Absolute heresy of course, but if it gets a bike back on the road..

7
Autojumble / Re: velocette gtp
« on: June 07, 2021, 08:25:38 AM »
Best of luck with that particular search. Velo wheels/hubs from the 1930s seemed to be unobtanium when I was looking, and that was close on ten years ago now.

8
British Bikes / Re: Contact breaker adjustment
« on: June 05, 2021, 12:31:36 PM »
40' sounds a lot for an old SV clunker running on modern juice though.
IIRC my old Bonnie was something like 38' on 5 star petrol, and down to something like 34' when unleaded etc were introduced.
On balance, I think for a bike like this I'd stay with the "set at TDC retarded" method and find the sweet spot with the A/R lever. These old girls run hot at the best of times and I wouldn't want to add to that.

9
British Bikes / Re: Contact breaker adjustment
« on: June 04, 2021, 10:00:59 AM »
I don't think they'd invented the degrees before BTDC method when that BSA was made.  ;)
If they didn't use the "pencil down the plug 'ole" they probably did the quick-and-dirty method, namely full retard at TDC with points just opening.

10
British Bikes / Re: 1973 Bonneville Ignition Switch
« on: June 03, 2021, 10:04:16 PM »
Yebbut even on starter fluid it still needed a spark, so somewhere the ignition circuit was made before it could run.

11
British Bikes / Re: Contact breaker adjustment
« on: June 03, 2021, 10:02:08 PM »
Yes it is a small nut and from memory it's 4 (or possibly even 5) BA. That said, you can often pick up little original sets of mag spanners for just this job, and some even come with a little screwdriver blade for the screw too.

12
British Bikes / Re: Contact breaker adjustment
« on: June 03, 2021, 04:14:38 PM »
If the bike runs fine then why bother? That said, it's no hardship to adjust a set of points,  and if you were to do it you might find the bike runs even finer. ;)

13
British Bikes / Re: 1973 Bonneville Ignition Switch
« on: June 03, 2021, 08:21:27 AM »
So what is the current (hoho) method for starting and stopping the engine, or is the whole loom missing?

14
British Bikes / Re: Replacement drum brakes
« on: June 01, 2021, 08:27:16 AM »
If you're in the UK try Saftek or Villiers Services. The latter fitted bonded linings to my BSA A7 shoes back in the Spring for under £25 inc postage.

15
British Bikes / Re: Advice on first project bike
« on: May 20, 2021, 10:00:32 PM »
I had a '36 Empire Star back in 2012 and most engine parts (within reason) were available either second hand or from places like Draganfly etc. They're simple enough bikes and you can usually make/adapt/repair things to keep it running.
Good strong bike with loads of that indefinable character. Always a good demand for BSAs so easy to sell on if you don't get on with it. I'd have it for the right price... ;)

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