Am building a trials cub but am unfamiliar with these engines so need help with choice of carb ignition gearing etc

With the 16/17t eng. sprockets do you have to use a split link in the primary chain or are endless chains available

Std frame or one of the McDonald or other types of frame kit what do you all think of these anyway

Depending on your budget the popular choice for ignition is PVL, no nest of wires, no battery, just a big heathly spark every time. Cases need modifying.

Carbs are an interesting subject, Keihin, Mikuni, Amal or Dellorto. All in regular use. Depending on where you live in the country dictates whats legal and whats not. See the thread on th Pre-65 Scottish and you'll get a flavour. I would recommend the Dellorto PHBL 22mm, but you need check what's good in your locale.

With the 16T engine sprocket, you still have an endless chain. you take out half a link and re-rivet it. I also run the Serco primary chain tensioner, which is featured on another thread. http://www.trialscentral.com/forums/index.php?showtopic=3243

If you run the wide ratio Cub box, 14/54 is a good choice. You can also modify 2nd gear to make it lower, and get a choice rather than using 1st everywhere.

Frames.....another mine field. I think it depends what you want to do with the bike. If you want to embarrass the boys on their '05 Gaseta Shertesa on the middle route, then you would probably want to invest in an ARMAC (Macdonald) frame - has the most suspension travel and sump clearance.

I can't comment on the Otter, apart from the engineering isn't as good and it hasn't won the ACU Classic Series for the last few years.

There's an option of using the Std front diamond, with the Miller top tube/oil tank, with a modded swinging arm and rear sub-frame to.

There's also forks, yokes and wheels to consider to, and believe me there's lots going here as well. Probably best not discussed in an open forum, there's children reading this board

If you want some more info, mail me, I've spent the last 14 months, figuring out what's what , I can send you contact details of the folks you might want to talk to and some photo copies of some good articles that will help.

Edited February 2, 200521 yr by Subira