Author Topic: klx450/kx500  (Read 87524 times)

0 Members and 1 Guest are viewing this topic.

Motorrad

  • Guest
Re: klx450/kx500
« Reply #150 on: December 21, 2013, 08:08:30 AM »
Okay.  I want one

Offline sandblaster

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 8,271
    • OEM-CYCLE QUALITY USED PARTS
Re: klx450/kx500
« Reply #151 on: December 21, 2013, 10:29:16 AM »
Okay.  I want one

Buy two and give me one  :lol:
The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline Twosmokerfan

  • Full Member
  • ***
  • Posts: 106
Re: klx450/kx500
« Reply #152 on: December 22, 2013, 12:37:03 PM »
Well done. Fancy building another :-D

I am getting mine dyno tuned today. Sick of screwing around with jetting. First runs showed that it was performing less than a 450. So we will see what the day brings

Offline sandblaster

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 8,271
    • OEM-CYCLE QUALITY USED PARTS
Re: klx450/kx500
« Reply #153 on: December 22, 2013, 12:42:05 PM »
If you will, please post your results and the jetting you settled with.
Thanks.
The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline ylwgtr

  • Full Member
  • ***
  • Posts: 134
Re: klx450/kx500
« Reply #154 on: December 22, 2013, 12:56:12 PM »
Yep im still not convinced about these engines,doing more fine tuning on the CDI dyno right now....But im not done yet i have some other ideas left......again,stay tuned!
« Last Edit: December 22, 2013, 12:57:49 PM by ylwgtr »

Offline Twosmokerfan

  • Full Member
  • ***
  • Posts: 106
Re: klx450/kx500
« Reply #155 on: December 22, 2013, 01:21:14 PM »
I will post the results.

Ylwgtr,
I will still send you ignition as promised so you can compare.
Ok?

TSF

Offline ylwgtr

  • Full Member
  • ***
  • Posts: 134
Re: klx450/kx500
« Reply #156 on: December 22, 2013, 01:28:08 PM »
great idea!

Offline Twosmokerfan

  • Full Member
  • ***
  • Posts: 106
Re: klx450/kx500
« Reply #157 on: December 22, 2013, 02:09:13 PM »
Well, initial results are in. My KLX500 needs air, and more than the standard air box can give. Now I know some of the more knowledgable among you will say "duh", but this is a learning exercise with some r&d along the way. I thought I had opened it up enough.

The klx airbox is too restricted in the midrange. More playing to follow. Looks like I am stopping at the hardware store on the 6 hour drive home to get some hole saws.

Ylwgtr,
This might be worth looking into to get some of that missing power on your klx


Offline ylwgtr

  • Full Member
  • ***
  • Posts: 134
Re: klx450/kx500
« Reply #158 on: December 22, 2013, 02:35:23 PM »
yep i been there mate i cut the whole top off the box.....did you run it with the side cover off?Or was it still struggling with it removed?
« Last Edit: December 22, 2013, 02:38:56 PM by ylwgtr »

Offline Twosmokerfan

  • Full Member
  • ***
  • Posts: 106
Re: klx450/kx500
« Reply #159 on: December 22, 2013, 04:16:22 PM »
Yeah mate. Side cover off and seat off to get max airflow. Huge difference. It was run with the seat off and then with the side cover off. Massive gain with the cover off. I need to modify the rhs of the airbox to simulate the air flow. Final test done with seat on and side cover off. I will scan the charts when I get home and post the starting point and the final superimposed. Well with the 18 dyno runs.

Offline Twosmokerfan

  • Full Member
  • ***
  • Posts: 106
Re: klx450/kx500
« Reply #160 on: December 22, 2013, 04:17:31 PM »
Oh, and this was after the jetting changes

Offline jBernard

  • Sr. Member
  • ****
  • Posts: 299
Re: klx450/kx500
« Reply #161 on: December 22, 2013, 05:02:07 PM »
please hurry up and post graphs.   :evil:
real legit kx5 dyno #'s are a rarity!
'09 KX500AF - never ending project
'14 KTM 300SX

Offline Twosmokerfan

  • Full Member
  • ***
  • Posts: 106
Re: klx450/kx500
« Reply #162 on: December 22, 2013, 05:21:11 PM »
Gotta get home first. 5 hours to go

Offline Twosmokerfan

  • Full Member
  • ***
  • Posts: 106
Re: klx450/kx500
« Reply #163 on: December 22, 2013, 10:44:32 PM »
Righto ladies and gents.  Please see the attached curves.  Now before you all start saying "my bike makes more than that", I did a direct comparison between a heavily modified KX450 and mine and the peak power is within 1 hp of each other.  The technician superimposed them and I can tell you that the 450 made similar peak power, but the 500 did it at about half the revs.  And that is what makes it more brutal than the 450 as it doesn't have to wind up as much.  He wasn't allowed to give me a print out, but I took some notes and at 50% of the 500's revs, it was producing 34 to 36 hp at the rear wheel.  The 450 was at about 70% of the 11,000rpm to deliver the same power.  The 500 produced about 4-6 ft-lbs more than the 450 and again at lower revs.

The blue line is the starting mess that I had.  Airbox restricted, needle too lean to compensate for the airbox (although not lean enough to detonate).  It was just like riding with the choke on all the time.  It made power and torque up top and a lot down low, with a big dip in the middle (actually a huge dip).

Power curve:



Torque Curve:


I discussed why it didn't have the hp I expected to see after the tune, and he said that to draw an accurate comparison between the two bikes, you should really test both bikes on the same dyno closely timed to each other to eliminate temperature and humidity differences.

Jetting as it stands (still yet to tune the pilot jet, but it is running way too rich)
Pilot: 58
Slide: #7
Needle: N82M on the middle clip
Main:168.

How do you like them apples?  Big change to the performance and he said the bike will be chalk and cheese to ride now compared to before.
TSF

P.S. Sorry ylwgtr, I didn't mean to hijack your thread, but seeing it was testing the KLX500, I thought it would be ok to put here.  Perhaps an admin can move it to the Jetting again, and again thread.




 

Offline ylwgtr

  • Full Member
  • ***
  • Posts: 134
Re: klx450/kx500
« Reply #164 on: December 23, 2013, 12:06:00 AM »
I'm happy for it to stay here bloke...thanks for posting....my take on dyno's are they are a tuning tool and thats it...im not interested in HP figures myself...your jetting is pretty much the same as mine except I got a smaller pilot with an opened up air box....Now that I've sorted the CDI,electric start I'm going to start cleaning the engine specs.....I have a very well known guy down here that's an absolute genius with two strokes....his name is bruce woodley
Bruce is very interested in doing this bike because of the stuff I've already done to it so this is a MASSIVE plus....another question for you guys..how much would you guys like to see EFI? ;)