Sean Colliers KX500 Project "I was only going to inspect the top end"

Bike Builds and rebuilds. Post pics and discuss your projects.
USMC 500
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Re: Sean Colliers KX500 Project "I was only going to inspect the top end"

Post by USMC 500 » Fri Oct 21, 2016 4:49 am

So here is a little info on the wheels and swing arm. After my buddy Tommy Roberts mounted the new rubber I found a few loose spokes and tightened them. Thanks to Pivot Works I had all the bearing kits needed for the steering stem, both wheels, shock, shock linkage and the swing arm. Scrubbed down the swing arm with some degreaser and a Scotchbrite pad.......Inspected and tightened the rim locks using a torque wrench and mounted a new 45 tooth rear sprocket. With all new bearings throughout the bike, new tires and all the love and attention to detail from the boys of KX Guru Racing, the Beast will be better than new.

Story on the sprockets........

Sean was running typical MX gearing 14/51. The 51 tooth rear sprocket was large to the point that it would drag the chain at a downward angle across the bottom of the chain guide. The chain had finally eaten through the lower chain guide slider, both bolts and completely out the bottom of the chain guide during our last ride. Fortunately I had this chain guide and 2 others on hand. I was able to make one really good serviceable chain guide out of the 3 and that's what's on there now. Talk about a budget build!! But it is solid, mechanically sound and not bad looking.

During the KX Guru Racing test session I had with Sean (video link below) he rode my bike with 13/45 gearing and absolutely loved it. He said that he could feel the chain rub on his bike and not on mine. He also liked the shifting characteristic and power delivery that my KX500 had with 13/45 gearing and stated that he wanted that same gearing on the Beast. With a 45 tooth on the rear we should eliminate the issue of the chain drag across the bottom of the chain guide at such an extreme angle.

https://youtu.be/U1m3jJgygC4

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Sandblaster
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Re: Sean Colliers KX500 Project "I was only going to inspect the top end"

Post by Sandblaster » Sat Oct 22, 2016 1:09 am

A word about bearings.
The bearings in this engine were a little over a year old.
Most seemed to be ok.
But what does that really mean?
How reliable are they?
Here is a short clip of Jason at JT Engine Works and I discussing the bearings.

https://www.youtube.com/watch?v=m1MBjrWXlEk
KX GURU RACING SEAN COLLIER KX500 230.JPG
KX GURU RACING SEAN COLLIER KX500 230.JPG (155.13 KiB) Viewed 1759 times
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Sandblaster
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Re: Sean Colliers KX500 Project "I was only going to inspect the top end"

Post by Sandblaster » Sat Oct 22, 2016 1:13 am

The next item was the head.
After Vapor Blasting the head we baked it for about 30 minutes at 200F to be sure all the water that gets pushed into the pours of the surface metal was completely gone.
KX GURU RACING SEAN COLLIER KX500 231.JPG
KX GURU RACING SEAN COLLIER KX500 231.JPG (147.65 KiB) Viewed 1758 times
After baking I went ahead and semi polished the combustion chamber.
I didn't put a high polish on it because we will be completely rebuilding this engine in a few months and make it something to be respected on the MX track.
KX GURU RACING SEAN COLLIER KX500 232.JPG
KX GURU RACING SEAN COLLIER KX500 232.JPG (313.42 KiB) Viewed 1758 times
KX GURU RACING SEAN COLLIER KX500 233.JPG
KX GURU RACING SEAN COLLIER KX500 233.JPG (231.11 KiB) Viewed 1758 times
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Re: Sean Colliers KX500 Project "I was only going to inspect the top end"

Post by Sandblaster » Sat Oct 22, 2016 1:15 am

Here is several shots of the engine...
KX GURU RACING SEAN COLLIER KX500 234.JPG
KX GURU RACING SEAN COLLIER KX500 234.JPG (131.57 KiB) Viewed 1757 times
KX GURU RACING SEAN COLLIER KX500 235.JPG
KX GURU RACING SEAN COLLIER KX500 235.JPG (129.01 KiB) Viewed 1757 times
KX GURU RACING SEAN COLLIER KX500 236.JPG
KX GURU RACING SEAN COLLIER KX500 236.JPG (188.84 KiB) Viewed 1757 times
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Sandblaster
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Re: Sean Colliers KX500 Project "I was only going to inspect the top end"

Post by Sandblaster » Sat Oct 22, 2016 1:16 am

KX GURU RACING SEAN COLLIER KX500 237.JPG
KX GURU RACING SEAN COLLIER KX500 237.JPG (111.12 KiB) Viewed 1756 times
KX GURU RACING SEAN COLLIER KX500 238.JPG
KX GURU RACING SEAN COLLIER KX500 238.JPG (93.03 KiB) Viewed 1756 times
KX GURU RACING SEAN COLLIER KX500 239.JPG
KX GURU RACING SEAN COLLIER KX500 239.JPG (158.17 KiB) Viewed 1756 times
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Re: Sean Colliers KX500 Project "I was only going to inspect the top end"

Post by Sandblaster » Sat Oct 22, 2016 1:16 am

KX GURU RACING SEAN COLLIER KX500 270.JPG
KX GURU RACING SEAN COLLIER KX500 270.JPG (124.23 KiB) Viewed 1755 times
KX GURU RACING SEAN COLLIER KX500 271.JPG
KX GURU RACING SEAN COLLIER KX500 271.JPG (154.03 KiB) Viewed 1755 times
KX GURU RACING SEAN COLLIER KX500 272.JPG
KX GURU RACING SEAN COLLIER KX500 272.JPG (110.01 KiB) Viewed 1755 times
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Re: Sean Colliers KX500 Project "I was only going to inspect the top end"

Post by Sandblaster » Sat Oct 22, 2016 1:17 am

KX GURU RACING SEAN COLLIER KX500 274.JPG
KX GURU RACING SEAN COLLIER KX500 274.JPG (104.88 KiB) Viewed 1754 times
KX GURU RACING SEAN COLLIER KX500 275.JPG
KX GURU RACING SEAN COLLIER KX500 275.JPG (98.7 KiB) Viewed 1754 times
KX GURU RACING SEAN COLLIER KX500 276.JPG
KX GURU RACING SEAN COLLIER KX500 276.JPG (118.95 KiB) Viewed 1754 times
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Sandblaster
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Re: Sean Colliers KX500 Project "I was only going to inspect the top end"

Post by Sandblaster » Sat Oct 22, 2016 1:18 am

KX GURU RACING SEAN COLLIER KX500 277.JPG
KX GURU RACING SEAN COLLIER KX500 277.JPG (91.7 KiB) Viewed 1754 times
KX GURU RACING SEAN COLLIER KX500 279.JPG
KX GURU RACING SEAN COLLIER KX500 279.JPG (95.54 KiB) Viewed 1754 times
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Sandblaster
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Re: Sean Colliers KX500 Project "I was only going to inspect the top end"

Post by Sandblaster » Sat Oct 22, 2016 1:19 am

When I tell people that our builds are like giving away our children I was only joking :lol:
KX GURU RACING SEAN COLLIER KX500 280.JPG
KX GURU RACING SEAN COLLIER KX500 280.JPG (115.66 KiB) Viewed 1753 times
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Re: Sean Colliers KX500 Project "I was only going to inspect the top end"

Post by Sandblaster » Sat Oct 22, 2016 1:22 am

Carburetion....
It was dirty and the floats were too low causing a lean condition.
It is a very common problem.
But after a bit of time we were able to make it ready to go again..
We disassembled, Vapor blasted, Cleaned everything spotless, polished the slide, set the float height and reassembled using the same settings the carb had to begin with.
Yes, we actually record before disassembly :o
kx guru racing sean collier float height.jpg
kx guru racing sean collier float height.jpg (479.79 KiB) Viewed 1741 times
KX GURU RACING SEAN COLLIER KX500 281.JPG
KX GURU RACING SEAN COLLIER KX500 281.JPG (186.71 KiB) Viewed 1752 times
KX GURU RACING SEAN COLLIER KX500 282.JPG
KX GURU RACING SEAN COLLIER KX500 282.JPG (182.78 KiB) Viewed 1752 times
KX GURU RACING SEAN COLLIER KX500 283.JPG
KX GURU RACING SEAN COLLIER KX500 283.JPG (182.22 KiB) Viewed 1752 times
If bikes are for kids I'll never grow up.

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