I'm getting ready to install a new Wiseco piston into a 2001 Blaster, we had it rebored 20 over. The pamphlet that comes with the new piston mentions if theres an exhaust bridge, I would need to drill two oil lubrication holes on the exhaust side. The new piston I have does not have those holes in it. Has any of you Blaster owner had to drill oil lube holes into the piston??? Any info would be greatly appreciated!

 

I havnt done it to a blaster but have done it a few times in my life. Just cant remember which bike I did it too. The holes are necessary to help lube the exhaust bridge(the hottest part of the cylinder) It will help prevent galling in that area. Not doing it will shorten the life of your fresh top end. Do you have instructions on how to do it?

 

where do you drill the holes i just did the top end on my blaster and nothing was mentioned about drilling holes for oil

 

I don't think this applies to people without oil injection, and where in bucks county you from?

 

Im about 10 minutes from trenton in washington crossing

 

It's a good idea to do with any exhaust bridge!
The bridge also needs to be relieved if you had it bored. (A good shop already knows this)

The theory is that the bridge can expand due to heat at a greater rate since there isn't as much material there. the clearance needs to be increased only for that area (Relief of the bridge area)

The holes in the piston provide additional lubrication for this high friction area (Due to the higher heat retention)
Just make sure that when you drill the holes, that they line up with the bridge... otherwise you'll have raw fuel/oil escaping out the exhaust instead of doing what you wanted.

 

Dune addict is right. It doesnt matter if its injected or premixed. To figure out where to put the holes you need to mount the piston with no rings and slide on the cylinder. Turn the crank so the piston is at TDC. Then you need to look up into the exhaust port and lightly scribe, or mark with a pen the outside of the bridge. Then remove the cylinder and the piston and drill the holes in the middle of the lines.