Forum > Chibi, Tora, Taka Talk
converting rotary transmission to return-type
JackA:
I have also posted this question in the 50-60-90-100 section, but maybe this is a better place (in case not everyone scans the whole forum for new stuff, as I do).
I am looking to build a couple of 50cc engines for vintage roadracing. For openers, I am leery of rotary transmissions for that use. Looking at the parts diagrams (what a helpful site this is, just for those and the other manuals!), it looks like the Tora has only about 4 more parts than the Chibi to make the shifter a return type instead of rotary, and my next step will be to ask Richard if he has those parts.
The drums are also different, presumably for 3 vs. 4 speeds (?). They both appear to differ from the Sport 50 drum, but query whether that could be used with the Tora stopper parts.
As an alternative, does anyone have any experience and/or photos of shop-made solutions for this?
thanks,
Jack
BRT-GTR:
Jack,
We are not ignoring you, most members including me don't have personal experience of the smaller engines.
Based on the onsite manuals, the Chibi and Tora specify a return type box, which model do you believe has the rotary type change. Get out clause ;D :- Can't find a service manual specifically for the Taka. Brian
JackA:
Thanks, Brian. Given the dearth of 50cc "vintage" racing ("post classic" to you, perhaps) in the US, I'm not surprised that there's much more lore about the 175s than the little ones on this board. I thought the Chibi had a rotary box, as well as the Sport 50 and 60, while only the Tora (among the little engines) had a return type shift -- but I have lots more reading in the manuals to do! Lucky to have them here, too.
Jack
P.S. And upon going back to the Chibi/Tora manual, I see that the Chibi does have a return box! I may have been paying too little attention since it's only 3 speeds, and since I need to end up with 50cc I have been looking more for Sport 50 motors. Thanks for the prompting!
JackA:
By the way, for those who may be interested in this topic, since my further pleas for help (and maybe an eventual build thread) will continue to be small engine related and not really about the Chibi or Tora models otherwise, I think I will confine my further posting to the 50, 60, 90, 100 section.
Jack
CL-100:
http://bridgestonemotorcycleparts.com/index.php?topic=4323.msg25248#msg25248
I'm not sure if this will help you but the link above is from a thread I started some time back. I was assembling a 100cc engine from a box of parts and ran across a "shift stopper boss" that is found on the Taka. It stops the rotary shift function of the drum, making it a conventional four down, four up transmission.
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