Not trying to jerk you around are you talking about Sqeezing your cylinder? Before you go dumping anymore money in that motor I would concider a new one. A cvr .15 would be a really good choice for that truck. You can get it in pull start or not and slide or rotary carb. for about 110. from tower. It seems to me that the motor that you have now is a lemon and not worth fixing . Putting a piston and sleeve in a motor is normal after wearing one out but not a case and bearings .