buy a service manual then take it apart....
Look at the vin tag on the steering head tube of the frame, it should have the year stamped on it.
your motor is a 1989 suzuki rm250 the 1988 rm250 motor started with j106 the 1989 rmX250 motor # started with j111
Around 80 mph.
32:1
No
a suzuki rm can achieve speeds up two 70 - 80 miles and hour
stock gearing around 72-75 mph
i have an rm 250 1990, it has 54 HP
Suzuki 163 Phlolina Yellow or later known as Aspen Yellow
For a 1992 Suzuki RM250, crankshafts from the 1991-1996 models are generally compatible, as Suzuki maintained similar engine designs during those years. However, it's always best to verify specific part numbers and specifications for the crankshaft to ensure a proper fit. Additionally, consider checking for any modifications or updates made to the engine over the years that might affect compatibility.
The serial number RJ12A-102556 indicates that your Suzuki RM250 is from the year 2002. Suzuki uses a coding system where the "RJ" prefix is associated with the 2002 model year. You can confirm this by checking the bike’s specifications and features that align with that model year.
i find my transmission is rather picky with oil in my rm250. ive used a variety but have best results with bellray 85w two stroke formula