Trying to finish up a four wheeler engine. 2005 Honda TRX450R.. Paying job.. Had a huffed rod/crank.
Interesting crankcase vent. A reed valve setup. The engine and trans have separate oils which is good but rare in the 4 stroke ATV/Cycle world until the past few years.
The crank is a three piece design. Rod bearing is roller. Rod has no cap. Exactly like a 2 stroke but 4 stroke.