Author Topic: C13?  (Read 182 times)

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Offline mobike

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C13?
« on: March 12, 2019, 03:35:59 pm »
Pete suggested others might be interested in my latest C ,not sure if i m in the right place?but here we go!
I first saw it advertised as "motorbike spares,"my first thought was I have both the makings of an almost complete  side valve c lump that appears to be in good condition and also  another ohv engine
With a large hole in the sump eaten away by corrosion,providing a nice view of the internals...
Anyway back to the subject,I contacted the seller who informed me that the original builder had put a short video on YouTube which I found.It was sporting a c15 tank with droop handlebars obviously based on a board racer?and sounded quite healthy,bearing in mind it was a couple of years back.
I called him back and basically bought it on photos.
It turned up a couple of days later and with the then owner looking on,I attempted to start it.Much to my surprise after about ten minutes I managed to coax fire and flames from it in a 30 second burst of very Smokey but apart from that a healthy sounding engine!
He said in the two years he owned it he had never heard it run!
I have since then rummaged in my "spares department" and came up with the tank,seat,handlebars ,levers ,headlamp an old bantam down pipe reversed as the possible beginnings of an exhaust.
In the short time I have owned it it has provided much interest for me in researching JAP engines and company history.
Apparently a 350cc side valve motor was entered in the 1936TT!
Newer designs were apparently available at the time but untested.
I have also established that my particular engine is a 1936 but lacks that provenance..
I m not sure but I have found that a similar engine was fitted to the "Atco" Deluxe 20" mower around 1935 -38.
(Thoughts of riding around the lawn on this JAP powered C with a scythe in my hand sprang to mind!!)
I am currently trying to source the correct exhaust nut and subject to riding it and assessing its performance(or lack?) I may carry on with it.
More to follow.....
« Last Edit: March 12, 2019, 04:13:12 pm by mobike »
Two wheels but not enough bikes!Maybe that should read too many bike bits but only two wheels!

Offline mobike

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Re: C13?
« Reply #1 on: March 12, 2019, 04:20:03 pm »
Another view
Two wheels but not enough bikes!Maybe that should read too many bike bits but only two wheels!

Offline mobike

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Re: C13?
« Reply #2 on: March 12, 2019, 04:31:15 pm »
And another
Two wheels but not enough bikes!Maybe that should read too many bike bits but only two wheels!

Offline Owen

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Re: C13?
« Reply #3 on: March 12, 2019, 04:34:28 pm »
That looks the basis of a nice special. I look forward to a running commentary of the build.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline Pete

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Re: C13?
« Reply #4 on: March 12, 2019, 04:37:58 pm »
You have the makings of a very interesting bike there Dave. I'd be tempted to carry on with the project.
1948 BSA C11
1932/56 C12Rudge
N.B. Andromeda
Volvo V40

Offline mobike

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Re: C13?
« Reply #5 on: March 12, 2019, 06:07:31 pm »
If anyone wants to view the original YouTube video type in board track racer should find it,check out the bell mouth s on carb and exhaust made from cheap Indian brass ornamental vase complete with engraving !
The actual conversion looks to be well done,must confess curious to see how it performs!
Two wheels but not enough bikes!Maybe that should read too many bike bits but only two wheels!

Offline mobike

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Re: C13?
« Reply #6 on: March 12, 2019, 06:18:42 pm »
As I first saw it
Two wheels but not enough bikes!Maybe that should read too many bike bits but only two wheels!

Offline mobike

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Re: C13?
« Reply #7 on: March 12, 2019, 06:24:28 pm »
This is my current loosely assembled project,rebuilt engine and quite a few " wrong" parts for its age but my first love!
When I saw the JAP engine in a C frame I thought that would look quite nice.....
What are your thoughts on a heart transplant?
Two wheels but not enough bikes!Maybe that should read too many bike bits but only two wheels!

Offline camman3

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Re: C13?
« Reply #8 on: March 12, 2019, 06:42:59 pm »
If anyone wants to view the original YouTube video type in board track racer should find it,check out the bell mouth s on carb and exhaust made from cheap Indian brass ornamental vase complete with engraving !
The actual conversion looks to be well done,must confess curious to see how it performs!

Here it is


Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Offline Pete

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Re: C13?
« Reply #9 on: March 12, 2019, 06:48:37 pm »
I'm loving it so far, and hope you stick with it. The beauty of building a special is there are no rules. Go for it, and keep us posted.
1948 BSA C11
1932/56 C12Rudge
N.B. Andromeda
Volvo V40

Offline mobike

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Re: C13?
« Reply #10 on: March 12, 2019, 07:09:55 pm »
Well done finding that and putting it up on here Cayman,my computer skills are lacking!
Two wheels but not enough bikes!Maybe that should read too many bike bits but only two wheels!

Offline camman3

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Re: C13?
« Reply #11 on: March 12, 2019, 07:19:58 pm »
Your welcome....the other side :)

1957 C12
In sunny (sometimes) Christchurch, Dorset, UK

Offline Owen

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Re: C13?
« Reply #12 on: March 12, 2019, 07:22:04 pm »
I think the JAP engine bike would look better with a rigid back end.  More in keeping with the engine period, but that's just me.
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Offline mobike

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Re: C13?
« Reply #13 on: March 12, 2019, 07:29:37 pm »
That s my thinking too Owen,we are on the same page !
Two wheels but not enough bikes!Maybe that should read too many bike bits but only two wheels!

Offline camman3

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Re: C13?
« Reply #14 on: March 12, 2019, 07:57:00 pm »
And girder forks imo....but maybe not if you are going to race it :-\
Graham
1957 C12
In sunny (sometimes) Christchurch, Dorset, UK