classic motorcycle forum

Motorcycle Discussions => British Bikes => Topic started by: tritonrat on March 23, 2006, 08:41:45 PM

Title: Triumph 4 to 5 speed conversion
Post by: tritonrat on March 23, 2006, 08:41:45 PM

 ???Anybody done a 4 to 5 speed conversion on a triumph pre unit, if so got any advice please ???

Title: Re: Triumph 4 to 5 speed conversion
Post by: slickshift on March 24, 2006, 12:48:24 PM

Did this quite a few times, get the entire 5 speed internals including the selector. Put the whole lot in the 4 speed case. If you use the 4 speed selector you will wonder why every 5th[?] gearchange is a neutral..
It's about 25 years since I did the last one, I can't remember there being anything to do apart from reasemble with the 5 speed bit's...
I used to come across quite a few people who had rebuilt boxes with the 5 speed internals and said it didn't work saying something like "you get loads of false neutral". That was cos they used the 4 speed selector bit's..

Title: Re: Triumph 4 to 5 speed conversion
Post by: mashmc on October 29, 2006, 05:55:12 AM

I recently changed my '60 Bonnie to a 5 speed, I did have to mill/machine the large tranny case so that the larger diameter Bearing would fit--I I had no problems with this mod- nice close ratio--love it.