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View Full Version : 06 1200C dyno results need help


fnagy82
6th April 2008, 18:28
I had my bike dyno yesterday and I having problems with the air\fuel ratio. I t would spit and sputter when he would first start the dyno run and the pick up and smooth out. I’m not sure what adjustments the carburetor needs at this point. The engine is stock except for the SE slip ons, N4 Andrews cams, HSR42 carb. I did change the main jet from a 160 to a 155 today. The top dyno run is mine and the bottom one was for comparison

Here are my Specs.
A/C Arlen Ness Big Sucker
ENGINE: 2006 1200c
EXHAUST SE slip on's
INGNION Stock
LOWER END: Stock
CAMS Andrews N4
CYLINDERS: Stock 1200
CARBURETER Mikuni HSR 42
PISTONS: Stock
HEADS: Stock
HP 81
TQ 78

rottenralph
6th April 2008, 18:32
It is a little hard to read the a/f looks like it went a little lean between transitions between jets. I know nothing about Mikunis so I can't comment about jetting or adjustment. The h/p looks about right.

fnagy82
8th April 2008, 03:12
Anybody have any comments on the hsr 42

rfranz1952
8th April 2008, 03:43
Decent numbers. What A/C?

robert
8th April 2008, 03:45
Stock air cleaner?

blakjak
8th April 2008, 04:15
Looks like right around 1700-1800 there's a hell of a lean spot. Is that right around where the spit and sputter is? If so, you narrowed down you're problem a little bit. I too have no experience with the Mikuni. I would think that it's the spot where you're transitioning from the idle circuit to the full throttle circuit if Mikuni's have the same setup as a CV. If that's the case, you can fatten up the slow jet and see what it does for you.

Hopefully someone who's actually tuned with one of these will chime in here and help out.

fnagy82
8th April 2008, 13:00
The air cleaner is a Arlen Ness Big Sucker