Triumphrat

RANCAM · 03-11-2007

DOES MY 2006 BONNIE NATURALLY RUN RICH?

JUST WONDERING.

sweatmachine · 03-11-2007

"naturally?"

Stock, they run pretty lean.

RANCAM · 03-11-2007

you know from the factory, "naturally"

RANCAM · 03-11-2007

Based on the info I found about lean and rich running, it seems that the bonnie runs on the rich side of the spectrum. After removing my silencers and installing the backpressure mod I can't make a distinction wether its rich or lean. It seems to be perfect.

Thanks
Randy

rodburner · 03-11-2007

It is hard to tell without scoping the exhaust. I enriched my setup with needles,shims and jets and despite that,ran a pipe that was leaning it out enough to catch my boots on fire,all the while,running fine and making a big boost in torque. So,your bike will run fine,even great,but somewhere down the line,your bike may lose some of its life.Just watch your plugs and the tips of you pipes for lean indications.

RANCAM · 03-11-2007

thanks for the input

randy

RANCAM · 03-11-2007

whats a lean indicator on the pipe tips?
the plug tip turns white, correct?

bonnieblackinfl · 03-11-2007

Yes, plug tips white, bright white.

What kind of back pressure mod did you do?

Greg

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 ]

rodburner · 03-11-2007

Pat,I`ve never dyno`d my bike,but with all the different configurations I`ve tried,the most buttdyno torque was realized in the lower revs when the bike was running its hottest [leanest],with only harder starting as the sole indication.