ninjette.org - View Single Post - Sanity check before potentially replacing rings on a race bike

DannoXYZ · February 20th, 2020, 01:57 PM

First, verify your air-filter is not soaking with oil. Only need two-layers of spray-oil per side.

Next, with bike level and rested overnight, make sure it's not over-filled with oil. You should see bubble of top of oil-level in sight glass.

Make sure crankcase vent-tube is NOT clogged. That's tube connecting rear of engine to air-box at bottom.

Do warm compression-test first and post results here. Do dry and wet test with oil squirted down spark-plug hole. Depending upon tester used, it should read anywhere from 120-180psi.

Then do leak-down test to determine if it's rings or valves that's leaking. You might just need valve-adjustment.

Last ditch-effort, do piston-soak and see if it improves. https://www.ninjette.org/forums/showthread.php?t=343925

February 20th, 2020, 01:57 PM	#2
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	First, verify your air-filter is not soaking with oil. Only need two-layers of spray-oil per side. Next, with bike level and rested overnight, make sure it's not over-filled with oil. You should see bubble of top of oil-level in sight glass. Make sure crankcase vent-tube is NOT clogged. That's tube connecting rear of engine to air-box at bottom. Do warm compression-test first and post results here. Do dry and wet test with oil squirted down spark-plug hole. Depending upon tester used, it should read anywhere from 120-180psi. Then do leak-down test to determine if it's rings or valves that's leaking. You might just need valve-adjustment. Last ditch-effort, do piston-soak and see if it improves. https://www.ninjette.org/forums/showthread.php?t=343925 Last futzed with by DannoXYZ; February 21st, 2020 at 10:04 AM.