JUST ABOUT FINISHED INSTALLING MY THUMPER RACING 470 KIT , ALL I NEED TO DO IS GO DOWN AND GET SOME VALVE SHIMS THE EXHUAST IS A LITTLE TIGHT WITH THE HOT CAMS THE INTAKE WAS ON THE MONEY ,I WILL RIDE IT THIS WEEKEND AND LET YOU GUYS KNOW BY THE WAY THUMPER RACING WAS GREAT TO WORK WITH THE MOTOR WAS DONE IN TWO WEEKS LIKE PROMISED AND ALL THE MACHINE WORK WAS PERFECT HEAD PORTING WAS NICE ROUGH ON THE INTAKE AND POLISHED ON THE EXHUAST

 

So you going to have some pics for us soon? I would like to see some of the parts before it's reassembled. Most of all I would like to hear dyno numbers once you get it broken in and dialed in. Low to mid 50's I would assume.

 

Yes get the Dyno numbers for us if you could. I bet you're in the mid 50's.

JeffP-how do you like your intake cam? Mine is going to be here friday, and was wondering how much improvement you saw. Also, did you get the installation right the first time, or have to go back in and fix it? Thanks

 

I had the cam in for a couple of days but when I went back to check the lash (per their recommendation) it had tightened up to much. I was getting around .100mm lash. I have new shims that just arrived at the dealer today so I'm going to pick them up tomorrow and reinstall it this weekend. This should put me in the .200mm range, as they recommend being on the loose end of the scale. I probably could of left it but I was getting to much valve noise to make me comfortable. As for cam timing etc. I did have all that all the money even though I second guessed myself several times.

The bike did have a little loss of bottom end. Some claim it doesn't but I don't think they are "in touch" with the response of the motor. The mid range and top end does have some decent gains. I think I'll see a little more gain up top once I put the new shims in. Being that tight it may of held the intake valves open just a little longer then it should (my guess).

 

sorry guys i dint get my camera out i was 2 lasy here is a little tip i learned what they use for the heavy clutch they use fibers out of a 88-2001 kx 500 stock steals and p#mt-24-6 clutch springs from barnet they told me the extra material on the disks makes it so they dont have to use a really heavy spring im waiting for some exuast shims or the quad would b done they said monday on them i wanted to ride the damn thing and when i get the numbers from the dyno i will post them

 

found some exhoust shims and fired it up last night i need to do the 15 minute high idle thing to break the cams in sounded great has more of a thump sound to it i didnt rev it very much but it seemed to rev quiker should have a ride report very soon

 

Yes please let us know the details on your 470 kit as soon as possible. I am very interested in getting the 470 kit and I wanted to know how it perfomed, especially against the yfz 450's

 

Imix, for courtesy sake could you just create a new topic instead of resurrecting a two year old post. adrenjnky hasn't even been on the site since 2003.
Thank you and welcome aboard.

 

Oh crap. Ok i see now where it says the date of message being posted. Sorry. First time on forum. Thanks MeyHymn

 

did you put a h-d cam chain in too it?