Hey,
I just bored my Blaster 67.50 over stock am i going to have any type of overheating problems? Also how long should I break it in for? Thanks any info will help,
Matt Murphy

97 Blaster,
DG pipe and silencer, K&N w/outerwear, 250 main jet, Weisco piston and rings, Boyseen read valva w/carbonfiber reeds, Bandit xc
all around on itp rims, also 18 inch street tires, intake and exaust ported and polished,Renthal bars, AC nerfbars.

 

It will not overheat. Mine is bored to 67mm and I don't have any problems. I like to run a full tank through before riding it hard. Let it warm up and rev it a little bit. Then let it cool down completely. Repeat this about three more times and take it out for a spin. Don't go full throttle until you go through at least 1 tank of gas.

 

Oh I heard you were supoust to run 2 tanks of gas thrugh it and when riding dont bring it into the power band which i have been doing. but it seems it heats up alot quacker than it use to at 20 over.

 

People have different ways to break in motors. People around here pretty much do what I said. It shouldn't be over heating too much. You can't really check jetting until you get it broken in. My advice would be richen it a little bit. That would help it break in better and might keep it cooler. What happened that you had to go from .020 to .080?

 

Dirt 817,
There was a lot of piston slap in the .20 over cyclinder so when i took it in he said 67.50 is how big i would have to go to clean up all the mess. Messed it up real bad. It wasnt that good to begin with I put a new piston in, not a really good hone when it was 20 over so i'm sure that didnt help. but what ever i just ran through two tanks yesterday, so it's broken in but I'm still not gona go wide open 6th gear till I go through one more tank.
Thanks for the info,
Matt