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Old 10-14-2012, 07:30 AM   #43
hardwaregrrl OP
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Joined: Jan 2006
Location: Atlanta
Oddometer: 7,581
Originally Posted by supershaft View Post
I wil try to help. All carbs jet the same. The difference carb to carb is how much and where the jets overlap.

I haven't read all the posts but it sounded like you found too lean on the mains. Just richer than too lean is perfect on the mains. Don't go back too rich. A bigger needle jet (richer) mainly effects just off idle to quarter throttle. A different base diameter jet needle does the same thing. The other biggie is the slide angle and they effect about the same range. BIG mileage changers since you are in these jets during a lot of cruise. Slides are expensive but you can make them leaner with a file. The tricky part is matching them on multi-cylinder bikes.

Idle jets do not turn off out of their effective range. Too rich an idle jet WILL effect mileage.

Part of the trick jetting just off idle is that different combo's of slide angle/needle jets/jet needles/idle jets do different things. To really find out what works best, you have to try a lot of different combo's. It's a lot of time and a lot of jets (times two!).

Like I always advise about Bings, it says right in the Sudco manual somewhere that needle jets are crucial. It really is true with Dell's too. That and the slide angle makes all the difference in the world. Good luck and I hope I am not poking the bear!
Thanks Billy! I struck out at Barber as no one had a Mikuni tune up box....weird....lots of Amal stuff though.

I'm planning on mimicking the VM32 needle jet and jet needle. I think P4 or P2 will do it...and not sure which jet needle yet. I'm going to keep the mains around 160/165, don't want to change too much at once. I won't touch the slide, that scares me and I think none other are avaliable for the TM series, again not sure. I may just shelve them and buy another spliter and just swap the Mikunis on before race day. But that developes another problem, throttling out of turns will be a learning process while racing. That might be a stoopid idear!
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