Back to the never ending stock carbs mods. Has anyone ever figured out at what point the stock needle and emulsion tube become the fuel restriction?

 

Just guessing but I would say around a 200 size mikuni jet would be max maybe a little bigger.

 

For those interested, I did the measuring today. Any main jet with an orifice .070" or greater will be useless with the stock needle and emulsion tube/needle jet. The cross sectional area of the Mikuni needle and needle jet will not flow more than a .070 orificed main jet.

 

What size does .070 " convert to in Mikuni main jet sizes? I'm fighting my stocker also. Raptoraz PM me and we can discuss mods done. I'll tell you mine if you tell me yours! [img]i/expressions/face-icon-small-wink.gif[/img]

 

I'll tell you what size that converts to later this evening. I'm gonna hit the Yammy dealer after work with my pin gauges.

 

I have no problem with my stock bore Raptor running DJ needles and Mikuni mains....190-192.5 that is.

 

ttt[img]i/expressions/face-icon-small-happy.gif[/img]

 

A .070" orifice converts to roughly a 165 Mikuni main jet.

 

LOL...LOL...[img]i/expressions/face-icon-small-smile.gif[/img].