Mike Waller finds himself with a BSA C15 swap bike.

And decides to built it into a

C15T Copy Bike....

 

 

This is the BSA C15T very much how it left the factory.

And no one can say that it was not a pretty little bike....

 But as a trials bike it was no lightweight...

 The bike was nearly as heavy as the Gold-Star it sort-of replaced.

The front wheel fitted had to have a 20" rim for the wheel not to touch the frame on braking.

 The 65 degree head angle was 2 degrees steeper than the road bike. this was not a different frame but just jacked up at the back slightly with longer rear shocks.

 The frame was just a modified swan neck road frame. 

The only difference was that the cast engine mountings were machined so to move the engine over an 1/8" to the left for chain clearance on the rear tyre.

(this could have been done by just fitting an 1/8" (2mm) spacer on the gearbox main-shaft before the 14 tooth sprocket.)

The footrests were moved back from the road position and held in place by a through rod passing between the two cast mountings. 

I remember these always coming loose.

Side stand on the left was just reversed and fitted on the shortened pillion footrest mounting tube on the right.

The swinging arm was always said to be longer and wider, but this was just a tale from the works riders... as far as I remember it was the same as fitted to the road bike.

Front forks were a mixture of parts from the A series forks and from the Triumph parts bin,if I remember. And started life on the the C11-12 some would say...The exhaust system was the biggest problem riding the bike as it always burnt your Barbour bottoms,  or worse your leg...

 these out side the subframe pipes were fitted on all the first batch C15Trials and it was only the works guy's again that eventually had enough and tucked the pipe inside the subframe.

Fuel tank and both mudguards (fenders) were steel that again added to the weight. worst problem we had with ours was the poor starting and the Rugby clay bunging up the back wheel.. 

But you know what I now think of the BSA unit C engine. How many have I got....

 Good luck Mike I am sure it will turn out a good job like they all are...

 

 

 

Project Outline...

 

Episode ONE...

 

 

Mike still a bit undecided?

 

Episode Two...

An Exhausting situation...

 

 

 

Mike makes a Stain-Less Steel exhaust system...

 

 

Here Jeff Smith shows off probably the second inside frame C15T Exhaust system Second? Yes Brian Martin would have had the first...

Note Modified oil tank...

 

 

Episode Three...20/09/2020...

 

Understanding Footrests.

And suffering the IT gremlins..

 

 

Just looking at the badly brazed prop stand joint that BSA did, shows how the industry had gone into decline even then 1959.

I have found joints just as bad on frames I have cut up, (did you notice the rust in the joint.)

It only came to my notice a couple of years back that the 14-12 gauge tubing used was in fact welded seam and very much of a iron basis...

 But they held the wheels and engines apart, and although most frame were at least 3/8" out of line the bike sold in vast numbers to get people to work. If Lucas had wound the electrics correctly? Good Olde Great Britain...

 

More Later...