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gantt · January 27th, 2020, 01:09 PM

you said compression and valve lash is ok. you could have a cam lobe that is wiped, not allowing the valve to open as much or as long as it should. i see the vapor back flowing from the intake tract on the left cyl. an exhaust valve not opening enough could be the culprit, and still give you good compression, and your valve lash is checked on the base circle area of the cam so you would not know if the raised part of the lobe was worn down. may want to pull the cams and measure them with a dial caliper or similar. i believe the workshop manual has specs for cam measurements. lift, etc...

when we figure it out, we are all going to drink a shot in celebration!!!

January 27th, 2020, 01:09 PM	#11
gantt ninjette.org sage Name: michael Location: Central Georgia Join Date: May 2013 Motorcycle(s): 2019 Ninja 400, Sold 2012 Ninja 650, Sold 2009 Ninja 250r, Sold 2007 DRZ400s Posts: 628	you said compression and valve lash is ok. you could have a cam lobe that is wiped, not allowing the valve to open as much or as long as it should. i see the vapor back flowing from the intake tract on the left cyl. an exhaust valve not opening enough could be the culprit, and still give you good compression, and your valve lash is checked on the base circle area of the cam so you would not know if the raised part of the lobe was worn down. may want to pull the cams and measure them with a dial caliper or similar. i believe the workshop manual has specs for cam measurements. lift, etc... when we figure it out, we are all going to drink a shot in celebration!!!