Properly modded ( using proven combos ) , the power curve charting of the the 250 engine shows that it pulls hard past 9700 rpm and documented seat-o-pants experience proves a hard pull to 10,500 rpm redline cutoff. This phenomena, whereby redline cutoff is constantly, but inadvertently, hit during WOT accels, is due to the fact that an expected power drop-off never occurs.

 

Hello Mr. Marcelino,
I've read your post numerous times, and like the idea of getting a few more ponies out of my '09 KLX250SF. For some reason, I can't see the photos and graphs that you're referencing, maybe it's my stupid MacAir computer, or browser, or just me? You're write-up has more than enough detail, especially with you including the cam centerline, so I am sure I can do the mod without the pictures. How do you feelabout deleting the ACR?
Thanks,
Will