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Author Topic: Sean Colliers New KX500  (Read 78749 times)

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Offline Friar-Tuck

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Re: Sean Colliers New KX500
« Reply #45 on: August 16, 2016, 04:17:21 PM »
Would something like this help dissipate some of that heat?

https://www.rockymountainatvmc.com/p/1193/41249/KTM-Rear-Brake-Reservoir-Extender

http://www.ziptyracing.com/brake-reservoirs/

 I know its not a bolt on for the KX but maybe there is something out there compatible?
  Tuck\o/
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Offline sandblaster

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Re: Sean Colliers New KX500
« Reply #46 on: August 16, 2016, 05:48:15 PM »
Yup... Since the master cylinder is from a late model KX450f the reservoir extension will work nicely  :-D
Thanks Tuck

« Last Edit: August 16, 2016, 05:57:56 PM by sandblaster »
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Offline Brute

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Re: Sean Colliers New KX500
« Reply #47 on: August 16, 2016, 06:58:43 PM »
Even with the fluid heating up it should release through the little bleed hole in the master cylinder unless it is plugged or the piston is not pulling back enough to clear the bleed hole.
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Offline sandblaster

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Re: Sean Colliers New KX500
« Reply #48 on: August 18, 2016, 08:33:18 AM »
Double checking alignment before weld...

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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline sandblaster

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Re: Sean Colliers New KX500
« Reply #49 on: August 18, 2016, 08:35:25 AM »
Travis is gettin after it...

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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline dave916

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Re: Sean Colliers New KX500
« Reply #50 on: August 18, 2016, 08:39:20 AM »
Quote from: USMC 500 on August 16, 2016, 02:21:31 PM
Quote from: sandblaster on August 14, 2016, 01:57:36 PM
Nope... I hooked it all up and it was not better then stock.
To make it better I would need a better master cylinder and it was heavier then the KX500 setup which is heavier then the KX450F setup.
So, I am using a 06-15 KX450F rear brake.
Sean already has a newer master cylinder on his bike so that should be ok.
And ask Oscar or Mojave... Sean is hard on a rear brake..

I took Sean to LACR this past Saturday for a test.  He brought his KX500, Mohave Greg brought his KX500 (Sandblaster built) and I brought my KX500 (Motorrad built) and CR500AF.  Sean was able to test the 4 bikes back to back and give very valuable feedback on the characteristics of each one.  We now have a VERY good idea of the motor that will be built for Sean.......Regarding the rear brake........Sean came in after 4 laps on Greg's bike with the rear tire locked up.  We feared that the tranny had failed and locked up.  What had actually happened was Sean heated the brake fluid so much that it built up tremendous pressure which locked up the rear brake.  I took a wrench to the bleeder and when I took the rubber boot off it literally POP'ed off.......When I cracked the bleeder the rear caliper made a loud POP sound and the rear brake released.  I know for a fact that Sean has cooked the rear brakes on the KX500 to the point that the pads would be bent in a "U" shape.......This is something that used to happed to the Ty Davis.  We should have better luck with the KX450 rear system on the bike.  Sean has told me that he uses the rear brake on the KX500 during a moto that it will completely fade by the 4th lap.......so he has learned to handicap himself by riding a complete race without a rear brake.  Once we fit him with a better rear brake that he can use, his lap times and track performance should increase.

Which motor did he prefer?   how did they differ?
how did the cr compare :-)
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Offline umberto

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Re: Sean Colliers New KX500
« Reply #51 on: August 18, 2016, 08:53:47 AM »
Agreed, you're leaving us in suspense...   :-D
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Offline sandblaster

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Re: Sean Colliers New KX500
« Reply #52 on: August 18, 2016, 10:08:18 AM »
Just a hint...
The CR had the most low end but died into the mid range..
Motorrads engine came in second for low end to mid range.
Mine was dead last for low end :x
Mine was first for mid to top  :-D
But that wasn't unexpected.
Sean want's a grunt engine..
Sean said that he could tell that my engine and Motorrads were very similar.
That's no surprise...  :lol:
But here is the differences.
Motorrad's has the bottom of the exhaust port blended and mine doesn't.
Motorrad's has piston skirt mods and holes all over the place... Mine only has a few oil holes.
Mine has the Kips drum wall removed and the port walls blended, Motorrad's doesn't.
Motorrads was running a FMF Gnarly pipe which is a good low end pipe.
Mine is on a PC2 which is better for top end.
Motorrad's is using a VF2 with boot mods.
Mine is a stock reed block with After market petals.
Motorrad's and mine are both using stock carbs but Motorrad's has a new top secret stealth needle in it..
And remember, these differences aren't like WOW CRAZY differences... Just noticeable..
So we are going to give Sean something with a little more grunt.  :-o
But you will have to stay tuned for the specifics.

Also,, Oscar has video and pics that we will be combining to make a youtube video with..

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Offline Foxx4Beaver

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Re: Sean Colliers New KX500
« Reply #53 on: August 18, 2016, 10:34:35 AM »
Quote from: sandblaster on August 18, 2016, 10:08:18 AM
a new top secret stealth needle

hmmmm....interesting.
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Offline sandblaster

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Re: Sean Colliers New KX500
« Reply #54 on: August 18, 2016, 11:36:01 AM »
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline sandblaster

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Re: Sean Colliers New KX500
« Reply #55 on: August 18, 2016, 11:46:15 AM »
Of course, this engine is getting all the cool internal port mods...
But it is also getting a bunch of the external casting flash removed  :-o





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Offline sandblaster

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Re: Sean Colliers New KX500
« Reply #56 on: August 19, 2016, 02:47:08 AM »
Oscar has some video and pics of their riding/test session.
Hopefully we can get a mini movie with interview info up soon.
Hurry Oscar... Hurry....
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Offline big green

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Re: Sean Colliers New KX500
« Reply #57 on: August 19, 2016, 09:50:53 AM »
Very surprised. So what changes will you make to provide more low end grunt foe Sean?
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Offline USMC 500

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Re: Sean Colliers New KX500
« Reply #58 on: August 19, 2016, 03:17:43 PM »
Quote from: big green on August 19, 2016, 09:50:53 AM
Very surprised. So what changes will you make to provide more low end grunt foe Sean?

We have a very good idea of the power that Sean want's for the new KX500 and there are a few methods to achieve this power.  Discussion based on the analysis of the test video's still needs to take place in order to decide the best route to take on this build.  We won't keep any secrets as the purpose of this build is to make the technology information available to all but for now I won't speculate until we decided on the final build specs
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Offline Larry Wiechman

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Re: Sean Colliers New KX500
« Reply #59 on: August 19, 2016, 03:52:38 PM »

 Get those bikes on a dyno and collect some useful data.
 Butt dyno data will have you running in circles; and behind the leaders!
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