Triumphrat

FattRat · 03-11-2007

I have had several Dyno runs performed on a couple Bonnie's, some free, some for a twenty dollar bill, others for as much as $40.00

Sweatmachine suggested that after I bumped my mains up to 135 from some lean running 122.5's, that I may have created too "fat" a condition
(little does he know how true this is on more than one account :-D ).

So I took a very sane, very legal, very boring ride yesterday behind a Beemer airhead. This, upon switching up to the fatter 135's (NH bellmouth, K&N, Thruxton needles, Predators, AI removed). The day before with the 122's in my bike returned a very poor 36 mpg while riding at steady speeds.... no hard acceleration, behaving like a good little boy, no playing; "36" is a pretty disappointing reading.
But with the fatter mains, and at a steady 68 - 73 mph for 131 miles, the Bonnie returned me almost 47 mpg(!). Now THAT'S quite a jump from 36! My fuel mileage WENT UP with fatter mains!

Why the long story you might ask????
Well, I took to studying all the print outs I had from the BonnieBlack a couple years ago, and the print outs from my current Bonnie 790. The BonnieBlack had the divider plate removed, my current red has it in place. Honest to God, I have (hold on, lemme go in the other room and count 'em) SEVEN different print outs to refer to!

-- This is the where I make my point --

ALL OF MY DIFFERENT READINGS WITH DIFFERENT JETS & DIFFERING THE CONDITIONS
SHOW A LEAN CONDITION BETWEEN 3200 RPM & 4800 RPM !?!?!

Make of that what you will,
but I didn't recognize the repeated pattern until looking at all my Dyno results last night.....

(I have reason to beleive sweatmachine was right about my running fat yesterday. So late last night, I put my 130's in. I'm sure I'm in the ball park now, BUT I'll betya that the bike is still running lean between 3200 & 4800 rpm......)

:???:

[ This message was edited by: FattRat on 2007-03-11 10:16 ]