SpectraSVT
Member
- Apr 17, 2002
- 720
- 0
Mo' Better Porting ride report...03 YZ250
A couple of people asked for a ride report after the Eric Gorr porting so here it goes. I took the bike out today at a local track and have come away with mixed feelings. First the good, the bike is faster. The midrange comes on hard and fast and it revs forever before topping out. Great over-rev. The bike responds instantly and I didn't have to gather as much speed to do some obstacles. It picks up super quick and gets up to speed in no time. This may not mean much but I drag raced some much faster riders on 450's up a hill and actually pulled them. They would leave me the very next corner but I felt fast for about 4 secs! I could never pull the 450's before up this hill.
Now the bad. I seem to have lost alot of bottom end. I originally did this so I could shift less but now I shift more. Bottom end is almost non-existent. Could be just jetting, I couldn't tell after 1 ride. I messed with air screw but had no luck just made the bike more zippy. I practiced starts a few times and if I didn't keep it reved, it would bog out in 2nd until I got into the midrange and it would pull in 2nd all the way down the start straight. Negative #2 would probably be that its too responsive. I ended up shifting twice before jumps just to get the bike to calm down a bit so I could hit a tricky jump. It was cool when I was fresh but when I got tired it was too much bike for me.
I am definitely gonna try raising the needle to try and take some of the snap out of the midrange. I don't know what to do about the pilot just yet becuase the bottom end is a major disappointment so far. Maybe when the main is set right I'll start with the pilot fine tuning.
A couple of people asked for a ride report after the Eric Gorr porting so here it goes. I took the bike out today at a local track and have come away with mixed feelings. First the good, the bike is faster. The midrange comes on hard and fast and it revs forever before topping out. Great over-rev. The bike responds instantly and I didn't have to gather as much speed to do some obstacles. It picks up super quick and gets up to speed in no time. This may not mean much but I drag raced some much faster riders on 450's up a hill and actually pulled them. They would leave me the very next corner but I felt fast for about 4 secs! I could never pull the 450's before up this hill.
Now the bad. I seem to have lost alot of bottom end. I originally did this so I could shift less but now I shift more. Bottom end is almost non-existent. Could be just jetting, I couldn't tell after 1 ride. I messed with air screw but had no luck just made the bike more zippy. I practiced starts a few times and if I didn't keep it reved, it would bog out in 2nd until I got into the midrange and it would pull in 2nd all the way down the start straight. Negative #2 would probably be that its too responsive. I ended up shifting twice before jumps just to get the bike to calm down a bit so I could hit a tricky jump. It was cool when I was fresh but when I got tired it was too much bike for me.
I am definitely gonna try raising the needle to try and take some of the snap out of the midrange. I don't know what to do about the pilot just yet becuase the bottom end is a major disappointment so far. Maybe when the main is set right I'll start with the pilot fine tuning.
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