This Crank Seal Repair Kit is exclusive to SBMP and is designed to repair a leaking crank seal on the clutch side of the motor for all 2017 and newer 250 and 300 carbs, TPI and TBI models.
The kit includes an OEM crank seal and distance sleeve, with a SBMP exclusive oversized oring.
We are finding many of the newer model 250 and 300 2 strokes are losing cranks seal prematurely on the clutch side of the motor. We have replaced many in the past and the problem continues to persist. We started using an oversized oring along with the OEM seal and distance sleeve, and this seems to fix the problem long term.
How to diagnose? Here are some common symptoms:
- The motor seems to run overly rich down low, soft and lazy with no torque
- Excess spooge out the tail pipe
- More than normal white smoke during hard acceleration
The easiest and fastest way to check to see if you are burning transmission fluid through your motor is to drain and measure how much transmission oil drains out after 5+ hours of ride time. The manual calls for 800ml of transmission fluid during an oil change. If you put 5+ hours on the motor after an oil change, then drain the fluid and measure how much comes out, you should get at least 780 ml drained out. Anything less than 750 ml drained out after 5+ hours of ride time, then you know you are burning transmission fluid through your motor and you need to replace the seal, distance sleeve and o-ring.
This is an easy all inclusive kit that includes an OEM crank seal, OEM distance sleeve, and an over sized o-ring which we think is the problem.
Be sure to watch our install video to ensure the distance sleeve goes in the proper direction. There is a very slight bevel to the inside edge of the distance sleeve, and that very slight bevel faces toward the o-ring and the crank bearing.