i have a 1999 scrambler 400 4x4 with full race mods run on 105 octane fuel,hsp exterminator race kit and i've blasted 2 engine yet,the engine broke like plate for too high compression,i've bored my motor to .080 also with 14.1 billet heads.it's a blast to ride but it only take 2 hours to broke up!the scrambler 400 is not a high performance quad.

 

Did you do the work yourself?
Work like that should be done by engine builders.

2000 SCRAMBLER 400 2X4

SCRAMDADDY400

 

I wouldnt trust hsp with anything of mine after i had one of there exhuast on my 500 scrambler and it snapped off and rusted and barely added power

 

What kind of carburetor are you using ? How is it jetted ?

It really should run .

 

I've never had a problem with my HPD Pipe for my Scrambler 500. It really helped low end power. I would recommend one of those.


Bad spellers of the world untie!!

 

my carb was a 42mm,and my main jet was for 440 with dually dial-a-jet kit,race lighten flywheel,aggressive clutch kit...

 

A 42 is a modified 38 TMX . On a flow bench it flows no more air than a standard 38TMX.

Do this . Change your needle to a #55 , and drop to a 10 to 15 pilot , and remove the dial a jet , see if that doesn't help things .

 

thank a lot man,you rule,i'm gonna try this out and see what it sound like!

 

Im not talking bout HPD im talking bout HSP it wouldnt of been so bad if they would of stood behind there product.