ninjette.org - View Single Post - Bike done about 24000 miles, never a valve adjustment, feels weaker.

DannoXYZ · August 2nd, 2019, 12:41 AM

Did you ever replace the dragging rear-brake?

Mentioned dark spark-plugs, which is sign of too much fuel. Which lowers power compared to more optimal leaner mixture (less fuel). There are many faults that can cause too much fuel. Vacuum-leak between throttle and intake-valve can cause false-readings from MAP-sensor, tricking ECU into injecting too much fuel. Extra fuel also clogs catalytic-converter with soot, restricting exhaust-flow and slowing bike down.

You should also do compression-test to determine internal wear on engine's rings and valves. Some autos have issues with burnt oil clogging rings, leading to poor ring sealing. Your dark plugs may also be due to burning oil. Clogged rings may be indicated with compression-test.

August 2nd, 2019, 12:41 AM	#29
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	Did you ever replace the dragging rear-brake? Mentioned dark spark-plugs, which is sign of too much fuel. Which lowers power compared to more optimal leaner mixture (less fuel). There are many faults that can cause too much fuel. Vacuum-leak between throttle and intake-valve can cause false-readings from MAP-sensor, tricking ECU into injecting too much fuel. Extra fuel also clogs catalytic-converter with soot, restricting exhaust-flow and slowing bike down. You should also do compression-test to determine internal wear on engine's rings and valves. Some autos have issues with burnt oil clogging rings, leading to poor ring sealing. Your dark plugs may also be due to burning oil. Clogged rings may be indicated with compression-test. Last futzed with by DannoXYZ; August 2nd, 2019 at 11:30 AM.