Yamaha YZ125 gets make over

Roger and Doug Amiss spent a productive morning testing some new bits that the Easter bunny had just dropped off...
A freshly ported cylinder and matched High Comp Head.. to match the new Pipe that had been made last year..
After a slow start due to some carby issues, finally got some really great improvements. Best came when we re-programmed the
Ignitech ignition with a map to suit the new porting... This little engine now sings nicely right though to 13.3 K plus rpm

It will be interesting to seen how this set-up back to back tests against the old engine setup..

Have a look at its last run...