440 w/450R carb jetting issues
Here's one for you to contemplate.
440 w 450R carb (zrpilot adt)
Full FMF exhaust
stock head (w kibble valves, stock sizes)
test 1:
190 main
48 pilot
2.5 turns A/F
clip @ #2 slot
- start fine
- idle fine
-slow throttle roll, good to 1/2 plus throttle then stumble
changed main jets from 190 all the way down to 168 using sizes in between. same results as beginning.
Test 2:
185 main
50 pilot
2.5 A/F
clip @ #3 pos. (center)
Changed jets all the way down AGAIN to 168
- same results!!!!!!???????
Called zrpilot, (great dude btw!)
After talking to him and explaining all the checks, he suggested removing the air box!!
Test #3:
185 main
50 pilot
20.5 A.F
clip @#3
(No airbox)
-ran GREAT, no stumble, hit rev limiter REAL quick!!
Recalled Z, he suggested replace air box.
- replaced it and
-started
-idled
-stumbled at throttle. 1/2 to WOT!!
We are thinking this one out! Interesting huh!
Suggestions are welcome!!! Will post more info later, off to garage!!