KX Guru Racing JT Engine Works KX500 Induction Crank testing

Bike Builds and rebuilds. Post pics and discuss your projects.
User avatar
Sandblaster
Posts: 6118
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX Guru Racing JT Engine Works KX500 Turbo Crank testing

Post by Sandblaster » Tue Jun 09, 2020 2:45 am

Fired!
Today I ran 3 heat cycles and took her out for a 2 mile and then a 10 mile ride..
To lean for the current compression and fuel but I can fix that 8-)


20200608_133213_resized.jpg
20200608_133213_resized.jpg (564.71 KiB) Viewed 393 times


Ready for some dyno work..
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 6118
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX Guru Racing JT Engine Works KX500 Turbo Crank testing

Post by Sandblaster » Fri Jun 12, 2020 3:56 am

I pulled a stock pipe from inventory and got busy..


20200611_150150_resized.jpg
20200611_150150_resized.jpg (352.57 KiB) Viewed 377 times

20200611_150204_resized.jpg
20200611_150204_resized.jpg (244.83 KiB) Viewed 377 times

20200611_150217_resized.jpg
20200611_150217_resized.jpg (384.78 KiB) Viewed 377 times

20200611_185131_resized.jpg
20200611_185131_resized.jpg (308.5 KiB) Viewed 377 times
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 6118
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX Guru Racing JT Engine Works KX500 Turbo Crank testing

Post by Sandblaster » Fri Jun 12, 2020 4:00 am

Next I'll get it sandblasted and get some paint.
I'm not sure about the color yet..


20200611_181238_resized.jpg
20200611_181238_resized.jpg (224.84 KiB) Viewed 376 times

20200611_181518_resized.jpg
20200611_181518_resized.jpg (274.31 KiB) Viewed 376 times

20200611_184235_resized.jpg
20200611_184235_resized.jpg (298.67 KiB) Viewed 376 times

20200611_184616_resized.jpg
20200611_184616_resized.jpg (319.75 KiB) Viewed 376 times

20200611_184812_resized.jpg
20200611_184812_resized.jpg (411.86 KiB) Viewed 376 times

20200611_185131_resized.jpg
20200611_185131_resized.jpg (296.73 KiB) Viewed 376 times
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 6118
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX Guru Racing JT Engine Works KX500 Turbo Crank testing

Post by Sandblaster » Sun Jun 14, 2020 11:47 pm

Ok.. sanded and painted the pipe and will call it good for now.
After all the testing and tuning this bike will go through I'll be doing a FULL rebuild from the frame up.
But for now this will work.



20200614_124938_resized.jpg
20200614_124938_resized.jpg (219 KiB) Viewed 358 times
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 6118
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX Guru Racing JT Engine Works KX500 Turbo Crank testing

Post by Sandblaster » Sun Jun 14, 2020 11:49 pm

Yep... Let's get our jetting dialed in :-)


20200614_124828.jpg
20200614_124828.jpg (863.41 KiB) Viewed 357 times

20200614_124910_resized.jpg
20200614_124910_resized.jpg (296.22 KiB) Viewed 357 times


NO, the 02 Sensor will not be a permanent addition.
It's there to get the jetting dialed in and then the EGT will go in to get the jetting really, really, dialed in... 8-)
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 6118
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

KX Guru Racing JT Engine Works KX500 Induction Crank testing

Post by Sandblaster » Sun Jun 21, 2020 11:38 pm

Ok. I have made good progress after some self inflicted ignition issues :o
I've got the jetting pretty good so I intend to do some dyno numbers next week.
at the current configuration I expect low 50's at the rear wheel.
Remember... This is using a stock carb, pipe, muffler, ignition, and reed, with significantly reduced port timing.
Zero porting has been done.
Reduced port timing will reduce performance...



20200620_141949_resized.jpg
20200620_141949_resized.jpg (441.7 KiB) Viewed 318 times
If bikes are for kids I'll never grow up.

User avatar
Sandblaster
Posts: 6118
Joined: Thu Jun 07, 2012 3:50 pm
Location: Eugene, OR
Contact:

Re: KX Guru Racing JT Engine Works KX500 Induction Crank testing

Post by Sandblaster » Sat Jun 27, 2020 4:58 am

Just back from the dyno.
What did we do?
Stock carb
Stock ignition
Stock reed
Stock pipe
Stock muffler w sparky.
Reduced port timing
Bumped compression
Stock Ignition on the center mark. Turns out that is where we made the most power.
Straight C12 with Motul 800 at 50:1



20200626_180112_resized.jpg
20200626_180112_resized.jpg (405.97 KiB) Viewed 284 times

20200626_181729_resized.jpg
20200626_181729_resized.jpg (415.3 KiB) Viewed 284 times

What did we learn?
1. My jetting is still too fat by one or two sizes on the main and that much or more on the needle..
2. The stock ignition makes almost two more hp over the Power D at the timing specs given by the manufacture. So eventually I need to get around to making new Power D timing measurement for the KX500.
3. Ignore the 50 hp... That will do nothing but increase... But look at the power curve.. Do you notice anything interesting?
It looks much more like a 4 stroke :o

So stay tuned as we will be gaining a lot more HP with simple bolt ons...
Then we will advance the port timing in steps...
And at the end of this... Then I will do some port work...
So stay tuned...
If bikes are for kids I'll never grow up.

Post Reply

Return to “Bike Builds and rebuilds”

Who is online

Users browsing this forum: No registered users and 2 guests