97 kx 250

K

kx250andrew

Member
Jan 19, 2002
4
0
irecently purchased a 97 kx 250. the engine is all stock with a delta force 2 reed setup, a procurcuitplatinum pipe and spark arrester.the suspension was done by factory connection.the question i have is concerning the powerband. it has a very strong mid range with decent low but it feels very weak on top. i was told that changing to the pro curcuit 304 silencer will give me more top end? also I will be replacing the top end shortly. I am a machinist an am wondering if there are any mods i should make to the cylinder or the head while it is apart. I am not looking to shift the powerband to the top i just want it to feel a little stronger up there without sacrificing the low and mid. Thanks for your input
Andrew
 
EricGorr

EricGorr

Super Power AssClown
Aug 24, 2000
708
1
You may find that the powervalve (center) is carbon blocked and won't open fully. So cleaning the KIPS system is most important. For the porting, use a die grinder and an oval shaped burr to raise the exhaust port to 38mm from the top of the cylinder. Be carefull to polish the port edges and especially deburr the junction between the exhaust port's timing edge (top) and the center valve cavity.
Also check the edges of the moving wedge valve for burrs. Theres a good picture in my book. When the edges get burrs, the valve won't open correctly.
Good luck
 
O

OKKX'er

LIFETIME SPONSOR
Sep 10, 2001
713
0
Like Eric said, you must have a powervalve not opening. Before '97 KX's didn't
have any rev, but a '97 will pull well into the upper rpm's.
 
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