Would it be smart to bore the cylinder of my quad from a 200 to a 240 or a 260? And are the cobra exhaust systems good or should i get the E-series universal mount silencer? Were putting TSLs on my TRX200SX and want more power for swamp riding.Any other mods or ideas would be helpful.


thanks

 

I wouldn't go much more than 40 over... Plus, that only adds a few cc's.
My buddy had a Curtis Sparks engine in his 250x, it was bored and stroker and was only a 267. Not sure what it was bored to though.. But hell, that thing was fast and would hang with a 400ex in a flat out drag race.
On the track (TT) he got first everytime and usually had a huge lead on everyone....(even built 400's) Of course his talent could have a lot to do with that, he was 8th in the nation about 6 or so years ago and didn't even go to many nationals..