I am in the early stages of getting ready to rebuild a Trail Boss 325 engine, as it has grenaded the connecting rod bearing on the crank. So far I have taken the head and cylinder off, then I saw how much play there was in the connecting rod and how many hunks of bearing material there were in the bottom end. This is my Dad’s ATV, He wants me to move forward with a rebuild on it, so tonight I will get the crankcase out of the frame and split to check the condition of the crank.

It HAD a newer engine in it, until someone borrowed it from my dad and they destroyed it because they never take care of anything.

I do not have a flywheel puller or a clutch puller. Any substitutes?

Also, depending on if the crank needs machined (I am sure it does) I haven’t the slightest clue on how to size bearings or tell the machine shop what to do. Is there a good resource for that?

I am in the early stages of getting ready to rebuild a Trail Boss 325 engine, as it has grenaded the connecting rod bearing on the crank. So far I have taken the head and cylinder off, then I saw how much play there was in the connecting rod and how many hunks of bearing material there were in the bottom end. This is my Dad’s ATV, He wants me to move forward with a rebuild on it, so tonight I will get the crankcase out of the frame and split to check the condition of the crank.

It HAD a newer engine in it, until someone borrowed it from my dad and they destroyed it because they never take care of anything.

I do not have a flywheel puller or a clutch puller. Any substitutes?

Also, depending on if the crank needs machined (I am sure it does) I haven’t the slightest clue on how to size bearings or tell the machine shop what to do. Is there a good resource for that?