KLX300 - "Unmuzzled" Power Charts Needed.
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Senior Member
Joined: Jun 2013
Posts: 3,317
From: North Texas
1st Gear Member
You stand to gain far more than removing the "dip" if you remove the secondary throttle plate and dyno tune with a PCFC - it'll be like buying a whole new bigger bike !
Senior Member
Joined: Mar 2021
Posts: 477
From: Rural Unincorporated Los Angeles County
1st Gear Member
You misunderstand me Tooter. I was trying to point out that what you are calling a "Dip" is just one indication of a much larger problem. Your entire power curve from off idle to approx 8000 rpm is a low performance abomination - artificially created via detune programming. Correct power curve shape is shown in my posted charts above.
You stand to gain far more than removing the "dip" if you remove the secondary throttle plate and dyno tune with a PCFC - it'll be like buying a whole new bigger bike !
You stand to gain far more than removing the "dip" if you remove the secondary throttle plate and dyno tune with a PCFC - it'll be like buying a whole new bigger bike !
Senior Member
Joined: Mar 2021
Posts: 477
From: Rural Unincorporated Los Angeles County
1st Gear Member
Your chart also demonstrates the effect on the curve of removing the secondary throttle butterfly. The "dip" is gone! 
Now that I have a "baseline" (slipon only) dyno, I just scheduled another dyno test for Wednesday the 24th as I've been really curious as to the results of all of the experimental mods I did, especially the secondary butterfly removal. I'll post the results here when I have the chart.
Now that I have a "baseline" (slipon only) dyno, I just scheduled another dyno test for Wednesday the 24th as I've been really curious as to the results of all of the experimental mods I did, especially the secondary butterfly removal. I'll post the results here when I have the chart.
Last edited by tooter; May 12, 2023 at 09:58 PM.
Junior Member
Joined: Jan 2024
Posts: 3
Map File
Update. And I will test more stuff down the road like air box lid removed.
It is still kinda cool here, 40s and 50s on the good days.
I have few hours of trail riding with the mods (really sloppy, a little technical, not hard for old guy intermediate rider). Additional mods include 14/46 sprockets, D606 rear, MT21 front, IMS pegs, zeta offset risers and Renthal bars with much less sweep. I like my new setup.
Bike is a really nice trail bike (should come this way from Kawasaki), power is way better, the added midrange is really appreciated on the trails. The power delivery is nice with the PCFC map, runs flawless so far from off idle to 9K. I don't think I ever redline it, just making noise past 9K.
Thanks KLXSTER for helping me not overthink it, glad I yanked the secondary throttle plate.
Tooter, I recommend a PCFC and I will send you my map, it works well. I added a ton of fuel to the midrange/high throttle angle and that fuel is what will help with power, but more importantly long engine life.
It is still kinda cool here, 40s and 50s on the good days.
I have few hours of trail riding with the mods (really sloppy, a little technical, not hard for old guy intermediate rider). Additional mods include 14/46 sprockets, D606 rear, MT21 front, IMS pegs, zeta offset risers and Renthal bars with much less sweep. I like my new setup.
Bike is a really nice trail bike (should come this way from Kawasaki), power is way better, the added midrange is really appreciated on the trails. The power delivery is nice with the PCFC map, runs flawless so far from off idle to 9K. I don't think I ever redline it, just making noise past 9K.
Thanks KLXSTER for helping me not overthink it, glad I yanked the secondary throttle plate.
Tooter, I recommend a PCFC and I will send you my map, it works well. I added a ton of fuel to the midrange/high throttle angle and that fuel is what will help with power, but more importantly long engine life.
