Category Archives: Uncategorized

Finding crankshaft balance factor on YZF-R125

going further down the crankshaft-rebuild rabbit-hole and getting on with the crankshaft rebuild for my new motor…

In this video we’re looking at trying to calculate the balance factor for the old 125cc setup vs with the big-bore kit, to see if that maybe explains why it’s run a little differently since going big-bore.

The logic is based on this video from 2StrokeStuffing (thank you!): https://www.youtube.com/watch?v=0hoE_…

Manual timing chain tensioner on YZF-R125

More fun with taking engines apart and finding things not as they should be on the YZF-R125