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Singles / Re: C15 - another oil feed problem
« on: 20 August, 2017, 07:10:41 »
You  should be able to find the Rupert Ratio book on Ebay.

Singles / Front brake
« on: 20 August, 2017, 07:00:53 »
I was at the Stilton bike show yesterday, met a chap with a B44. We chatted about brake power on british bikes.
He had twin leading shoe conversion, But I was happy with the standard brake on my C15 SS.
This has reminded me of a conversion I did 50+ years ago.
My B33, with Superocket engine fitted, had the standard, one sided drum.
I had noticed the way the Vincent twin front brake worked.
I bought another wheel from the breakers ( About 3 ). I removed the press-fitted drum and the short spokes and fitted them to my wheel.
To work the twin drum brakes, I run the original inner cable to its normal brake arm on the right.
I shortened the inner cable, and fitted it to a home made alloy sheet lever, pivoted at the centre, with another inner cable connected to the left side brake arm.
This gave the normal action to each brake, with normal pressure on  the hand lever , but needed twice the movement.
So the only disadvantage was that the cable needed tighter setting, and more frequent adjustment. It worked perfectly well.

I dont like the heavy cast iron, full width hubs on my C155. I would like to the lighter slim hub type. It is the high cost of spares that stop me!

Singles / Re: C15 ss Max speed
« on: 09 August, 2017, 10:35:06 »
I cant see a number on the carb.
I think the main might be 190

Singles / Re: C15 ss Max speed
« on: 09 August, 2017, 09:44:40 »
I want to drive at normal road speeds - 60MPH, 70 MPH, even 80 MPH.
My bike reaches 60 OK. 65 takes awhile. 70 is rarely possible.
I would like 80 or more to be available, so overtaking is safer.
I ride FLATOUT where the road allows, that is because the bike is so slow!
There is NO problem with running at full power.  It is needed with any low powered bike.
If I had plenty of power I would not need to ride flatout!

I know a Japanese bike would give me the performance, but my desire is to have a classic British machine.
I do not have the physical strength to handle anything heavier than 300 lbs.
Cost is also a consideration. My riding is only local, its a problem thinking of anywhere to go!!

Singles / Re: C15 ss Max speed
« on: 25 July, 2017, 10:35:11 »
80 mpg

Singles / Re: C15 ss Max speed
« on: 25 July, 2017, 09:22:18 »
I think I have reached a plateau with my C15 SS.
With the 18 tooth sprocket, it needs clutch slip at take-off, or in slow traffic.
Did a flat out speed run. 66 mph one way. 71 mph coming back.
With the previous low gearing, it was no faster.
At only about 5400 rpm, it is more pleasant and less strain on the engine.
At full speed on full throttle, when I ease the throttle back ,there is no loss of speed until nearly down to half throttle!
This suggests that the 1 1/16" carb is bigger than needed. It would be interesting to try a 7/8" if I had one.

8.5/1 comp ratio, scrambles cam, bigger inlet valve.

Singles / Re: BSA C15 Gearbox,
« on: 12 July, 2017, 11:25:08 »
There are plenty of photos and drawings of the gearbox on line.
You could search Google images with various wordings.
There will be sumthing to help you somewhere.
Also, the 'draganfly' spares site has illustrated parts lists.

The Star and Garter / treating rusty rims.
« on: 03 July, 2017, 16:53:24 »
My C15 has many small rust spots on the rims.
Rubbing down with wirewool removes most of the rust, leaving very small  spots.
I will try rubbing over with a rag soaked in silver paint, to disguise the spots, and give some protection.
Is this a good idea, or is there a better way.

Singles / Re: C15 Forks
« on: 02 July, 2017, 14:58:36 »
A quick fix so you can ride again. drain all the oil from the forks, carefully clean all traces from the outside.
Put the oil back after MOT.
(You dont get old but you get crafty)

Singles / Re: C15 ss Max speed
« on: 01 July, 2017, 14:06:52 »
This morning I changed my rocker box gasket. Bad leaks from top end.
I tested my top speed. Now 66 mph at only 5300 rpm, not the 8000 rpm
'red line' for this engine. Much more pleasant.

Singles / Re: C15 ss Max speed
« on: 24 June, 2017, 13:31:30 »
My C15 SS came with 15 tooth sprocket. As used on C15T
the standard for C12 SS, is 16 tooth.
For C15, 17 tooth.
I have now changed to 18 tooth.
I like it!
More relaxed at higher speeds. It still moves away from rest easily, and has lusty acceleration with a handful of throttle.
And that nice bang bang sound of a big single.

Singles / Re: C15 Max Speed
« on: 14 June, 2017, 07:27:22 »
I dont think that riders weight affects the top speed. It is only the acceleration which will be slightly less with heavier rider, although I doubt it would be noticeable without checking by stop watch.
What does affect top speed is air resistance. Crouching down will increase the top speed.
Of course gradient and wind speed/direction has a big effect.
My C15 ss now reaches 60 mph, then slowly creeps up to 70, no more.

The Star and Garter / useless brakes on classic bikes?
« on: 12 June, 2017, 11:51:32 »
It has been often stated that the old British bikes had 'useless' brakes.
I never found this when I rode many bikes in the 1960s.
My present C15 seems just fine.
The rear brake will easy lock the wheel. The front brake seems powerful, I am afraid to use full power
for fear of skidding. At low speed, it can lock the wheel.
Of course, my bike can only scrape up to 70 mph.
Comments, please

Singles / Re: C15 ss Max speed
« on: 29 May, 2017, 15:39:11 »
My figures were wrong. Tried again and got
6008 @ 70
6866 @ 80
So ,its about 1000 rpm too slow at 80 (if it could reach that.)

Singles / Re: C15 ss Max speed
« on: 29 May, 2017, 14:32:51 »
I have now reverted to the original absorption silencer.With a few short runs, I find that the top speed is 70 MPH, or a little more,
measured by satellite. Speedo reads 10 mph fast. (80 top speed!). Rpm reaches 5150 at 60.That should be 5956 rpm at 70.
, and 7940 at 80. isnt that about right??
I do not want go down on gearing. I dont like to run at high revs. At 50 mph, I would prefer to gear  UP! But that would mean using third for higher speed, No.
I really aught to increase engine size for result I want, but engines are expensive and one does not know if they will perform without renovation.

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