Fine Tuning Help

[thor_eyerdhal]

Carbs previous settings :
Main jet DJ175
Idle jet stock
PAJ1 stock 95
PAJ2 stock 170
needle S7 clip on N°3 from middle
Idle fuel screw 2.5

Bike was running great everywhere except 3000-5000 where there was a flat wide"spot"

I installed an Innovate LM1 and saw a 11 WOT AFR at 9000 and 9.5 between 3000-5000. Obviously DJ175 was too big..


I swapped DJ 175 with Mikini 155
WOT AFR came up at 12.5 at 9000 (Great!) and 10 between 3000-5000
Bike run greater! and middle range flat spot was weaker.

I moved down the needle (last position available)
Midle range AFR is now 11-11.5 between 3000-5000, feelling is better but this is too rich again.
Now there is a lean spot at, about 16-17AFR between 2000-3000 WOT...
Part throttle is OK.
All of this with Vboost always opened.

How to cancel the lean spot between 2000-3000 without raising the rich condition between 3000-5000 ?

Should i try Stock needles (french ones, they are two stepped, but larger than S7 ones)

Should i try stock springs?

Should i try PAJ1 and 2 changes?

 

[gamorg02]

whats the air intake? i'm thinking maybe a stage 1 needle.

whats weird is 3k-5k at middle throttle and 2-3k wot is actually right about the same range, needle. you're not on full mains until 4.5k on WOT usually.

i'd try a different needle shape.

 

[06VMAXIMUS]

I had the same problem. I put the stock springs back in to slow down the slide and it took care of the stumble. Smooth now and running about 13.5 AFR.

 

[thor_eyerdhal]

whats the air intake? i'm thinking maybe a stage 1 needle.

whats weird is 3k-5k at middle throttle and 2-3k wot is actually right about the same range, needle. you're not on full mains until 4.5k on WOT usually.

i'd try a different needle shape.

As writed in the first post, this is a full Dynojet Stage 7.

Part throttle (from very light to half)is buttometer fine everywhere from idle to 5000, then it hesitate a bit (too lean, probably too low of needles)
Cruise at 2500 is a bit over 12 AFR ,at 3000 is a bit under 12AFR...
Only WOT cause lean condition under 3000 and rich conditon between 3000-5000

In fact Part throttle AFR is the opposite of WOT AFR...!

I will try Spring in first (faster swap) and then needles.

 

[thor_eyerdhal]

I had the same problem. I put the stock springs back in to slow down the slide and it took care of the stumble. Smooth now and running about 13.5 AFR.

I ll try this tomorrow, it could fix the rich condition but i am afraid it will enhance the lean one below 3000... :confused2: