ninjette.org - View Single Post

DannoXYZ · July 13th, 2019, 02:33 AM

Carbs need thorough cleaning.

None of those mods makes much difference in flow at idle-speeds that will throw off AFR (they will make difference at WOT & 13000 rpms).. Unless you actually get a measured AFR number from wideband O2-sensor, do not guess or assume anything about AFR. Also understand what various mods do. Shimming needles does nothing for idle.

Your pilot jet and emulsion tube's bleed holes are not clear. Also hole leading from pilot jet to carb-venturi is most likely obstructed. Spray carb cleaners DO NOT work. You need ultrasonic cleaner soaking with real cleaning solutions along with mechanical flossing using guitar wire followed with soda blasting.

Don't compensate for clogged jets and circuits by blindly dumping in more petrol. You'll have to continually add more needle shims and go to larger and larger jets over time as clog gets worse and worse. Fix actual problem, not compensating for symptoms. Clean those carbs and restore them back to factory-fresh conditions. Then bike's idle and throttle-blip behavior will be factory-fresh as when it first rolled off showroom floor.

July 13th, 2019, 02:33 AM	#3
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Carbs need thorough cleaning. None of those mods makes much difference in flow at idle-speeds that will throw off AFR (they will make difference at WOT & 13000 rpms).. Unless you actually get a measured AFR number from wideband O2-sensor, do not guess or assume anything about AFR. Also understand what various mods do. Shimming needles does nothing for idle. Your pilot jet and emulsion tube's bleed holes are not clear. Also hole leading from pilot jet to carb-venturi is most likely obstructed. Spray carb cleaners DO NOT work. You need ultrasonic cleaner soaking with real cleaning solutions along with mechanical flossing using guitar wire followed with soda blasting. Don't compensate for clogged jets and circuits by blindly dumping in more petrol. You'll have to continually add more needle shims and go to larger and larger jets over time as clog gets worse and worse. Fix actual problem, not compensating for symptoms. Clean those carbs and restore them back to factory-fresh conditions. Then bike's idle and throttle-blip behavior will be factory-fresh as when it first rolled off showroom floor.