2001 ktm 400sx: need a bit more power

[thumper144]

My compression release on my 2001 sx 400 has broke. The actual lobe which rides on the cam chain gear has come up through the head of the engine amongst causing a bit more minor damage to other small parts involved. I havent had the bottom end checked for damage yet(hopefully none), but since I have the engine apart I would like to get a bit more power out of it. Someone suggested a high compression piston from wiseco stating that it "wakes the bike up". 1)Does anyone have any other suggestions? 2)Can I still use straight gas after bumping up the compression? 3)I also plan to change the cam roller bearings after hearing many people have had difficulty with them...what should I replace them with?

 

[marcusgunby]

Have you rejetted as this is a major problem on the KTM 4t-they are too lean on the needle.

 

[thumper144]

Have not rejetted marcus...although I think I'm happy with the jetting(maybe previous owner may have re-jetted). The bike starts and runs well in the summer except for if you fall or stall it. I have not tried running it in colder conditions though.

 

[Coach in ND]

The 2001 400 SX came jetted fairly well from the factory, but you will be able to get some more performance with the OCEMN needle and some other minor brass.

I ended up with these settings in both my 2001 400 SX and 2002 400 MXC.

OCEMN needle 4th clip
170 Main
1 1/2 turns out on fuel screw
Stock pilot
Pump set at 1 sec squirt time.

Coach