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Calkins
03-19-2009, 03:40 PM
I'm looking to redo my whole dirt bike. I'm going to install a 673cc big bore, raise the compression, cam, port the head, possibly add larger valves, maybe larger carbs, etc. You know, just a SMALL upgrade! This bike will be used on backroads, creek beds, open fields, and the such. The factory carb setup is a round slide 38mm primary and a secondary that is 38mm with a vaccum round slide AND a mechanical butterfly. I want to replace the weird carb setup with a pair of regular carbs. I'm thinking maybe a pair of Edelbrock flat slides. With all the upgrades, should I up-size the carbs? If so, how much, 40mm?
http://www.motorcyclespecs.co.za/Gallery%20%20A/Yamaha%20TT600%2083%20%203.jpg

jwells
03-20-2009, 08:40 AM
That carb set up was a little weird, but it worked fairly well. Don't just look at carb size however when thinking about upgrade-big diff between how the round slide and the vaccum work in comparison to regular flats.
Best thing maybe, get on Thumper Talk website-lots of motorheads on their and all specific to singles.

Calkins
03-20-2009, 10:25 AM
Cool, I'll do that. Thanks!!!!

jwells
03-20-2009, 02:46 PM
No problem-thank you.