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Old May 25th, 2023, 02:36 PM   #1
dan151
ninjette.org member
 
Name: Dan
Location: USA
Join Date: May 2023

Motorcycle(s): 2012 Kawasaki Ninja 250R

Posts: 20
2012 Ninja 250R Bogging/Sputtering On Take Off Running Rich

Hi Folks,
Took a chance and bought a low mileage 100% stock non-running 250r that sat garaged for a number of years. New battery and fresh gas, bike started but died when the choke was closed. Removed carbs to find no varnish, just some light debris. Thoroughly cleaned the carbs ensuring all jets and passages were clear and now the bike will idle fine at around 1300 rpms and revs smoothly in neutral, however when you hold the throttle steady above idle, the bike bogs down and shuts off. The same symptoms occur when you try and move forward in gear. I was able to start moving once but it bogged and sputtered severely and could not pick up any speed.

Details thus far:
-All troubleshooting and adjustments on a fully warmed engine
-Spark plugs were very dark and exhaust smells rich
-All jets stock
-Needle orientation correct: N9VU-left N9VW-right
-Float heights 17mm +/- 0.5mm
-Removed mixture screw caps and set both to 2.5 turns out
-Diaphragms undamaged
-Petcock is functioning properly, no change when running on "prime"
-No vacuum leaks found, all tubes secured and undamaged
-Air filter and air box are clean
-Tried lowering the floats by 1mm, symptoms remain

Any suggestions where next to troubleshoot?
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