Originally Posted by one-nil
hi, I have a NSR S5 that I want to change to a 3 port for more torque - short track, unfortunately none of the local shops have S3 sleeve. From the above info. it looks possible to do this by fitting a LS 3 port sleeve into my existing S5. Can anyone confirm if this is really the case? I hate to be spending on the new sleeve to find out that it doesn't work, worse blowing up the rest of the motor. Cheers.
Yes you can change from 5 to 3 port piston/liner within the same construction-it will fit perfectly.
About performance-it is questionable-some people claim that 5 ports is faster and I personaly doubt it. If you use good 3 P/L set with outlaw carb and pipe it will be as fast as 5 port if not faster.
Edward