High altitude jetting 08
Any one have any proven A/F and jet figures for high altitude carb set ups? My 08 stock ran a 11-11.5 A/F @ 6500ft- 7000ft. Had a 135 in the front and a 140 in the rear 1.5 out on both carbs for the fuel screw.
Now I run a pro muzzy with whisper cores, K&N stlye filter 3" opening clamp on inside the air box with 1 1.5" hole drilled in the lid. Stock needles no shims. 150 f and 155 r keihin jets. Stock pilots. Clipped about 5/8" of the stock springs and epoxied the stock vacuum holes in the slide and drilled 2 1/16th holes like the sticky. Dyna non programmable cdi.
I have H.W. springs coming end of this week.
For now I have a FAST dual O2 a/f meter... long story short they sent the wrong one to me, but I can read the A/F but it is in lamba.... but I'll convert it for easy reading......
12.5 a/f ave of both cylinders with the above settings and 12.5 a/f ave at idle. I get a slight pop back through the carb on the rear carb.... might be needing the Dyna coils??
Now with this A/F meter I can read each cylinder independently, and the main reason why I bought it. To tune each cylinder is ultimately better. Now I have read some posts about running a richer main in the rear carb.... some feel it is from lack of air flow thus more heat build up..... some are just following the stock leaner front richer rear main jet configuration. Either way.... I found out today that with my current carb config (far cry from being tuned) show that the front cylinder had a better (IMO) leaner A/F then the rear.... but the average of the two was still 12.5. In other words the rear runs 12.2 and the front runs 12.8...... for a combined average of 12.5 (+/-)
Any one running the same jet in both carbs front and back? Any one tune each cylinder? Seems to me I might try it and see what the dual A/F shows.
Sorry for the long boring post.