2020 tbr7 pz30 carb tuning

Captcj68chris@aol. · 08-02-2022, 05:54 PM

Hi all Chris here. As title states, stock carb with aliiexpress pilot jet, Amazon main jet kit.
PILOT JET K42, fuel/air 2.5 turns out (do not have k44 in my kit,)
MAIN JET K125 (chart for comparison I saw. K125= mikuni110??)
MY PROBLEM bike will pull healthy from low RPM full throttle till upper RPM 6000ish?
(I have no tach) then bike starts to sputter/buck,cut out.
Changing main jet to any other size, up or down will just exaggerate the issue!
I'm in bowling green k.y. altitude <1000 foot max?
Bike will start and idle from cold with no choke or throttle.
Do I need a half size jet adjustment? (Are these engines that sensitive?)
Spark plug has good color.
Bike is not registered, not ridden on open ,road, or off road, just in my neighborhood and mostly no more than 1\2 throttle
am I looking at a fuel issue, or an ignition problem?
Thank you
Christopher

08-02-2022, 05:54 PM	#1
Captcj68chris@aol. Join Date: Mar 2020 Location: Bowling greenK.Y. elev. <1000 ft Posts: 94	2020 tbr7 pz30 carb tuning Hi all Chris here. As title states, stock carb with aliiexpress pilot jet, Amazon main jet kit. PILOT JET K42, fuel/air 2.5 turns out (do not have k44 in my kit,) MAIN JET K125 (chart for comparison I saw. K125= mikuni110??) MY PROBLEM bike will pull healthy from low RPM full throttle till upper RPM 6000ish? (I have no tach) then bike starts to sputter/buck,cut out. Changing main jet to any other size, up or down will just exaggerate the issue! I'm in bowling green k.y. altitude <1000 foot max? Bike will start and idle from cold with no choke or throttle. Do I need a half size jet adjustment? (Are these engines that sensitive?) Spark plug has good color. Bike is not registered, not ridden on open ,road, or off road, just in my neighborhood and mostly no more than 1\2 throttle am I looking at a fuel issue, or an ignition problem? Thank you Christopher
	0