focusinprogress
City Limit Moto:Parts-Service-Apparel (716)8038606
SO - I've been working on two bikes here that I've gone completely through and both are exhibiting similar symptoms that I can't seem to figure out the root cause of.
Bike 1: 1975 CB360
- ultrasonic cleaned and rebuilt carbs - floats set to 20mm
- rebuilt petcock
- new points and condenser
- valve clearances set to spec
- camchain tensioned to spec
- new NGK plugs
- disassembled (unstuck as it was seized) spark advance mechanism and lubed/reassembled.
- carbs synced on vacuum gauges and checked headpipe temps with infrared thermometer (within 4* Left to Right)
- fresh tank ethanol free 91 octane
Bike 2: 1972 CL450 scrambler
- ultrasonic cleaned and rebuild carbs, including new brass floats
- rebuilt petcock
- set valves to spec
-camchain tensioned to spec
- new NGK plugs
- throttle cables synced up and idle set screws synced using head temps/infrared thermometer
THE SYMPTOMS:
Both bikes fire right up and idle nicely, even rev quite well parked in nuetral.
Both bikes when I go to ride them fall flat on their face over half throttle and spit/sputter with lack of power.
Pulled plugs on both bikes, BOTH have proper brown color on the right side plug, but both quite lean on the left plug
I sprayed all over the carb boots and carbs themselves while running, no vacuum leaks present.
I was working on the 360 first, and I originally thought maybe it was an ignition issue so I threw a charlies place electronic ignition in it and it has not changed the symptoms.
ANY THOUGHTS?
Paging CrazyPJ?
I'm just pretty blown away its basically the same symptom on both bikes and can't seem to figure it out. wondering if anyone has gone through this before and I'm maybe missing something simple?
Bike 1: 1975 CB360
- ultrasonic cleaned and rebuilt carbs - floats set to 20mm
- rebuilt petcock
- new points and condenser
- valve clearances set to spec
- camchain tensioned to spec
- new NGK plugs
- disassembled (unstuck as it was seized) spark advance mechanism and lubed/reassembled.
- carbs synced on vacuum gauges and checked headpipe temps with infrared thermometer (within 4* Left to Right)
- fresh tank ethanol free 91 octane
Bike 2: 1972 CL450 scrambler
- ultrasonic cleaned and rebuild carbs, including new brass floats
- rebuilt petcock
- set valves to spec
-camchain tensioned to spec
- new NGK plugs
- throttle cables synced up and idle set screws synced using head temps/infrared thermometer
THE SYMPTOMS:
Both bikes fire right up and idle nicely, even rev quite well parked in nuetral.
Both bikes when I go to ride them fall flat on their face over half throttle and spit/sputter with lack of power.
Pulled plugs on both bikes, BOTH have proper brown color on the right side plug, but both quite lean on the left plug
I sprayed all over the carb boots and carbs themselves while running, no vacuum leaks present.
I was working on the 360 first, and I originally thought maybe it was an ignition issue so I threw a charlies place electronic ignition in it and it has not changed the symptoms.
ANY THOUGHTS?
Paging CrazyPJ?
I'm just pretty blown away its basically the same symptom on both bikes and can't seem to figure it out. wondering if anyone has gone through this before and I'm maybe missing something simple?