Wilsons Sandbox

At 7:24 AM -0600 7/08/2000, Kurt Simpson wrote:

>Rotated the carb and put a 142.5 and increased the discs to 12 (just for >experiments sake)...now runs even and pulls hard throughout the range...but >not quiet as much gusty as with the 145 and 8 discs...I decreased the pilot >jet to 13/4 and am now getting a bunch of "popping" on deacceleration. The >bike starts w/o fuel enricher so I suspect the needle is very aggressive >even though it is in the middle notch. >I have a dial-a-jet and that is probably the next step as you have to adjust >the main on the leans side.

It's my position that many folks are running way too rich which the assumption that an aftermarket exhaust and a K&N filter makes the engine a real breather. So far, after playing around for a year, I currently feel that my leaner setup works best for my Tengai: a Trapp IDS with 18 discs, K&N, backfire screen pulled, 140 main DynaJet with the needle way down in the collar with the E-clip second from the top. I'm consistently getting 44.7 +/- 0.2 mpg in a hard mix of highway and city driving. Mark B2 A2

Jim Hyman quizzed:

> Do the DynaJet main jet numbers (sizes) exactly corresspond > to the stock Keihin jet sizes?

[...] Unlikely. Even if Dynojet, Keihin and Mikuni have the same orifice size for a given jet number, they could all have different flow curves owing to variations in the profile of the exit and entries next to the actual orifice. So, when quoting jet sizes, it is good form to mention the brand of jet. Mister_T

> Jim Hyman quizzed: > > > Do the DynaJet main jet numbers (sizes) exactly corresspond > > to the stock Keihin jet sizes? > [...] > > Unlikely. > Even if Dynojet, Keihin and Mikuni have the same orifice size for a > given jet number, they could all have different flow curves owing > to variations in the profile of the exit and entries next to the > actual orifice. > So, when quoting jet sizes, it is good form to mention the brand of > jet. > > Mister_T >

Right on the money, (as usual), Ted! (Turbulent flow, no chance for any development. The flow characteristics are almost solely determined by size and entry/exit region geometry.) Jeff

Attachments :Here's a pic of my "Ammo Can" mod. It's waterproof, tough and ugly. And best of all, the entire project cost me a wopping $9.00! Three bucks for the "Ammo Can" and two cans of flat black enamel at three bucks a pop. The box is a 7.62x39 military ammo. I'm thinking about mounting two on the back rack, side by side. -Dave Kleber Pittsburgh, PA http://www.city-net.com/~davekle/