hi just bought a c15 engine distriputor type.thinking of putting it in oif b25 frame to do a few small club events.going to strip engine to check any usfull suggestions without braking bank.will fit elecronic ignition.cant find engine number.

Hi Guy's.

Hi Dave.

Engine number should be on the crankcases on the left hand side just underneath the bottom of the barrel.

Dizzy motor could realy do with the timingside mainbearing conversion, If you strip the motor. But mainly oil pump needs checking, along with rings, bushes,bearings etc.and check for stripped threads. A lot of people think this motor is a lot softer than the later ones. You could also try to find a wide ratio gearset, I think there are some new ones about but they are expensive. Good luck with the build. PS. have you narrowed the frame?

Regards Charlie.

Dizzy motor could really do with the timingside mainbearing conversion, If you strip the motor.

Hi Dave,

Hi Charlie,

I`ve just started stripping my engine down, I`m heading for the bigend but I`m gonna see about upgrading the timing side bush whilst I`m in there. I spoke to a guy at Alpha Bearings and, if I understood him correctly, they do a bearing replacement for the timing side bush, no machining required, £128.

He also said if the timing side bush is worn it can lead to oil starvation of the bigend.

I`d be interested to know what anyone who has done this conversion thinks.

Back on topic. My hopefully, useful suggestion,

If you strip the engine right down make sure you prime the oil pump (a pump oil can on the feed line works) before you start it and check you have oil returning to the oil tank before you ride off, don`t ask how I found this out first time

Edited November 10, 201114 yr by Pierre66

Hi Dave,

Hi Charlie,

I`ve just started stripping my engine down, I`m heading for the bigend but I`m gonna see about upgrade the timing side bush whilst I`m in there. I spoke to a guy at Alpha Bearings and, if I understood him correctly, they do a bearing replacement for the timing side bush, no machining required,

Hi Woody,

Thanks for that. Already got the later conecting rod with roller bigend. The bigend bearing and crank pin is

hi guys.thanks for all that info.charlie what do you mean by narrowing frame.also no numbers in ussual place under barrell drive side and it dosnt look as though numbers ground off.im not sure about timing side bush conversion as i ran a 500 triumph for years with plain bush and gave it some welly but changed oil on time.and had no problems.cheers

Edited November 12, 201114 yr by daveg

Hi Guy's

Hi Dave.

Looks like you have a set of replacment crankcases then?

To narrow the frame you pull in the two seat down tubes to a narrower section at the top, you have to cut the tubes, take a small amount out, heat the tubes to pull them back in and then reweld. I will take a picture of one done today for you.

Timing side bush is OK as long as it is tight and in good condition, if not you will loose oil presure and this does not help the big end to survive long. A single is a bit more vunerable than a twin!! for some reason, smoothness perhaps???

Good luck anyway. :thumbup:

Regards Charlie.

Hi Guy's

Hi Dave.

Picture has promised.

Regards Charlie.

Hi Guy's

Hi Dave.

Picture has promised.

Regards Charlie.

hi charlie thanks for that will let you know how i get on was thinking of putting it in oif.frame b25.cheers dave

thanks for all the info.going to use road gears for now any suggestions for gearing down.cheers dave

Hi Charlie, New to this site. Can you help me, is the frame pictured legal for the Scottish Pre 65 Trial, thanks, Iain

Hi Guy's.

just reading this page from the C 15 title before.

With the picture of my converted frame, it was asked by the last poster Is it Pre 65 Scottish Legal????

Is it ? I don't know? The rules change every year don't they!!!

A bit more help on your engine here Andy M .

Regards Charlie ...www.bsaotter.com

Hi Guy's.

just reading this page from the C 15 title before.

With the picture of my converted frame, it was asked by the last poster Is it Pre 65 Scottish Legal????

Is it ? I don't know? The rules change every year don't they!!!

A bit more help on your engine here Andy M .

Regards Charlie ...www.bsaotter.com

Thanks, just picked this up. Getting a phosphor bronze bush machined for timing side. Mentioned other parts in other thread.