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Old August 4th, 2022, 07:05 PM   #3
DannoXYZ 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
Wow, that's pretty bad! This is usually due to letting valve-clearances get too tight with wear. The valves spend less time touching the seat. Which is how they're cooled. Exhaust valves face harder life and they overheat!

You may also need valve-seats cut as well due to wearing wider and wider. Want to cut them back to minimum widths on intake and middle range on exhaust.

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