Data Logging for tuning your KZ

OK Tek9ine, I tried to get some better full throttle pulls today. I did return to the #17.5 pilots, needles on the 4th clip, and #125 main jets. I don't have a colortune, so I just adjusted each mixture screw until I got the highest idle. I guess that I may need to order a colortune unless anyone has a suggestion of how to best tune the mixture screws. The highest idle was happening at a conglomerate AFR of about 12:1. Also note that today's high temperature was 75*F, and I did all tuning on the bike after it was fully warmed up in the afternoon.

I'll post three separate screen captures. In each case, when you see me go to full throttle, it is in 4th gear. I know that I didn't get close to redline, but once again I ran out of road or was closing on a car so fast that I decided to get out of it.

First graph shows two brief full throttle pulls with very similar results:

Next graph shows a longer full throttle pull in 4th gear. Notice the spike in AFR initially and then the AFR drops to 12:1 as the main jet comes into play fully, then climbs with rpm. I think that the main jets are right, and I need to focus on the needles to get the best mid-range response. Also note the second pull at about 30% throttle. Seems that the needles need to be raised.

Finally, we have two part throttle pulls. It would be nice to see the AFR in the 12.5:1 range. Seems that I need to raise the needles or find a different needle profile.

Also note that I'm still suffering the same problem where I have the bike running way rich just off idle. I need to get this right to properly tune this bike.

testarossa wrote:

Next graph shows a longer full throttle pull in 4th gear. Notice the spike in AFR initially and then the AFR drops to 12:1 as the main jet comes into play fully, then climbs with rpm. I think that the main jets are right, and I need to focus on the needles to get the best mid-range response. Also note the second pull at about 30% throttle. Seems that the needles need to be raised.

I believe your correct on the main jet theory.

Notice how the WOT pull in graph 2 starts real lean, then drops and then goes back lean, then down to expected AFR. I I think this is the result of the engine traveling thru its advance range. The engine hasnt reached full advance, and therfore will almost always give you an unreliable result, as the engine is quickly changing the burning environment conditions whilst the advance quickly changes degrees.

I think you have to many variables here!
Like a science experiement with not enough controls!

Tuning the bike while at idle and cruise should be ok/farily easy.
Tuning for accelleration AFR should be judged after full advance - approx 3500/check with timing light.
WOT pulls as well, should be judged after full advance. (Sorry, i knoe you have trouble in your area doing this )

Then, once you've got those circuits nice and close to where you want, I would start to tackle low end accell thru the advance range.

You may need to change needle type, slide type (cutaway), etc.
The mixture screws should be leaner than what is found to be highest idle, actually considerably leaner - and that should help. A colortune plug helps immensely with troubleshooting and mix setting! Especially to watch the accell mix as well.

Forgive my ignorance but... what setup do you have again?
Carbs, filter/airbox, exhaust?