BannedCR500Riders.com

Roostius_Maximus wrote:either way its a bored 39 and the metering block stands up out of the venturi further than intended

Oh... Good point... I hadn't considered that...

Cool... Post lots of pics... I can't read... :shock:

Will do but I will warn you I am bad for doing all kinds of work and remembering to take step by step photos about 9 steps after I start.....patience not my best virtue haha.


All I see is blah blah blah... I told you I can't read :D :) :lol:

Cool... Post lots of pics... I can't read...

Watch eBay every day

The one you need is embossed with ML3
FITS 87-88 CR500
P/N 17253-ML3-770
I have not tried any others but based on part numbers only the info is accurate.

What carb and elevation are you running?

Send the top end to Roostie... You won't be disappointed...

We have been running at Cottage Grove Oregon.
But I believe the next race is in Lebanon Oregon in about 3 weeks.

Results last night...
1st heat placed 2nd
Finished 5th in the second heat and discovered a bad fuel leak.. No smoking please.
In the mains, started 8th... ran up to 5th and the pipe ...

We were really excited for Friday night.
Jason and I spent a full day tuning...
It is running awesome.
So Casey (The driver) goes out and takes his practice laps.
He is all over the place and goes off the track twice.
The last time he went off the track he caught some air.
When he came into the pits ...

Race results.
1st heat placed 1st.
Second heat placed 4th.
Main was in second but spun out. Had to start over from the rear of the pack, ended up placing 3rd but was DQ'd due to a early restart that everyone says was bunk.
Oh well, that's racing.
Overall I'm not dissatisfied with the results ...

A lot of testing has been done on this.
Your right... Too little... Major issue.
To much??? Not so much.
I'd like to see it a bit better then yours but I have certainly seen a lot worse..
A VERY GENERAL rule of thumb is .004-.005" per one inch of bore for normally aspirated engines. .006-.007" per ...

Yesterday we received a 91mm CR500 Wiseco piston.
I took the cylinder and piston to the machinist and told him the specs I wanted it bored to. I should have it early next week.
We will be getting the Kart this time so we can tune it and break it in over a few days.
I can't wait....

Well... The top end is torched... Disassembled and found a plugged pilot jet

I know I know, that's racing... But I don't have to like it.
So, rebuilding the top end. The next race is in two weeks...

The question we want to know is will it go or will it blow

The customer picked up the engine tonight and races tomorrow.
Jason and I will be there to watch the carnage :-)

More progress was made today

http://i644.photobucket.com/albums/uu165/oemcycle/CR500%20ENGINE%20KART%20BUILDS/JT%20ENGINE%20WORKS%2089%20CR500%20CART%20ENGINE%20BUILD%20129_zps8hk21pov.jpg

http://i644.photobucket.com/albums/uu165/oemcycle/CR500%20ENGINE%20KART%20BUILDS/JT%20ENGINE%20WORKS%2089 ...

I can't get a replacement head in time so here ya go..

http://i644.photobucket.com/albums/uu165/oemcycle/CR500%20ENGINE%20KART%20BUILDS/JT%20ENGINE%20WORKS%2089%20CR500%20CART%20ENGINE%20BUILD%20126_zpsdgt2nqrc.jpg

Jason is a porting machine.... Now, if he makes it faster that will be a bonus ...

I hate these gaskets... Where's the Cometic!!!

http://i644.photobucket.com/albums/uu165/oemcycle/CR500%20ENGINE%20KART%20BUILDS/JT%20ENGINE%20WORKS%2089%20CR500%20CART%20ENGINE%20BUILD%20127_zps7ifw4h0d.jpg

Oh yeah... It's ready..

http://i644.photobucket.com/albums/uu165/oemcycle/CR500 ...

Ok, welded up, and cleaned up... ready for assembly..

http://i644.photobucket.com/albums/uu165/oemcycle/CR500%20ENGINE%20KART%20BUILDS/JT%20ENGINE%20WORKS%2089%20CR500%20CART%20ENGINE%20BUILD%20119_zpsqevjabzy.jpg

Polished the ID of the Exhaust flange

https://bannedcr500riders.com/images/auto ...

Started lapping. You can see where the dark area's are on the mating surface.. And you can see the light spots... Dark is making contact, the light isn't doing anything... Yet...

https://bannedcr500riders.com/images/auto/a4add6ad60e092472e0f2d934b8b8ae5.jpg

Now look... The mating surface is all ...

Cleaned up the cases and stripped them so I can see what needs to be done and prepped for weld..

https://bannedcr500riders.com/images/auto/acced6f9b5403b777916bc43f02ab0d0.jpg

More prep

http://i644.photobucket.com/albums/uu165/oemcycle/CR500%20ENGINE%20KART%20BUILDS/JT%20ENGINE%20WORKS%2089 ...

Nice port job.... NOT!!!!

https://bannedcr500riders.com/images/auto/cb0d9113dab80759de679038343684db.jpg

Busted bolt tower

https://bannedcr500riders.com/images/auto/636df389a87807c51296b5df399698b5.jpg

CRACK!!!

https://bannedcr500riders.com/images/auto/5a9bb73b0ad82d7ba4d79c4f0f7de03d.jpg ...

PVL ignition system. I know these aren't the best but we have what we have to use..

http://i644.photobucket.com/albums/uu165/oemcycle/CR500%20ENGINE%20KART%20BUILDS/JT%20ENGINE%20WORKS%2089%20CR500%20CART%20ENGINE%20BUILD%2014_zpsiey6dgge.jpg

QRC head

http://i644.photobucket.com/albums/uu165 ...

Before I get started I want to thank Adam for this site as well as all his tech info he has helped us with..

Ok, so Jason from JT Engine works and I are building a couple of Kart engines. One has a very short build time so we are doing what we can but we really don't have the time to do what we ...

I'd let Adam run one on his bike first... If it didn't blow sky high then I might consider one :-)