ballpark jetting

[fastrthnu]

k, Id like some opinions on a ballpark for my jetting. I have a 391cc rz passion 12port, with +4mm, makes 182psi @ sea level with milled head, boyeseen dual stage carbon pros, pods, 34mm mikuni tm flatslides, rockets. When I ran 30m carbs with the 385cc prior to rebuild a 370 main was lean, and I didnt get a chance to figure out what it was before getting these 34`s. Trying to guess a roundabout size on pilots and mains. was thinking 30/410ish?

[fastrthnu]

ok then.

[Fireroad Express]

370s in a mikuni flatslide will be fat with that set-up. i got +4 stroke, 68mm bore, dune port, 18cc domes , +5 timing,t-5s and 34mm TM mikunis w/ pod filters. i'm running 280 mains and its still on the rich side. thats at sea level. flatslides suck alot more fuel than a roundslide.

[fastrthnu]

370s in a mikuni flatslide will be fat with that set-up. i got +4 stroke, 68mm bore, dune port, 18cc domes , +5 timing,t-5s and 34mm TM mikunis w/ pod filters. i'm running 280 mains and its still on the rich side. thats at sea level. flatslides suck alot more fuel than a roundslide.

 

I had tm 28`s on it before the 30mm vm I was running at 370. the 28`s where jetted 25/360 which was right on. that was with k&n in box open box. at 280 I dont think my quad would even run.

[Fireroad Express]

yeah i know it doesn't seem right. flatslides pull alot more fuel though the main circuit than a compareable VM carb. this is because of the short distance air has to travel across the flat slide compared to the thicker round slide. this produces alot more "draw". if you try and run 370 mains in your TM 34s you'll pull your hair out trying to figure out why you can't get rid of that mid range to top end bog.