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Old October 6th, 2020, 09:20 AM   #4
DannoXYZ
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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
Yeah, verify valve-clearances and cam-timing.

I've seen gummed up dried petrol seize up intake-valve stems.
Although that doesn't make engine difficult to turn.
Try following:

- spray PB-Blaster onto intake-valve-stems through intake-port
- spray PB-Blaster into cylinders through spark-plug holes
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