drill

Hii everyone... Question: To drill? or not to drill? 2 stroke pistons i mean.... Drill holes matching the exhaust bridge, or not? Buying a 2018 KTM SX 150 for a VERY GOOD price this weekend, Because it needs a top end rebuild and barrel re-plating.. Which isnt a problem... The reason why i...

I just ordered a new 2003 rm 125 cylinder/jug. Do brand new cylinders come with the exhaust bridge relieved or do I need to buy the parts to shave it down?