summer is comming and i want to keep up with my dad on his 400ex and my step mom on her scrambler 400.

 

Go to you local junk yard and get a cast iron Chevy 350 engine block. Buy 6 feet of heavy duty carbon steel chain. Attach one end to the engine block and attach the other end to your Dad's 400ex. You should now be able to keep up with him.

 

lol okay tHAT WAS FUNNY BUT no look into getting a cam that will make a big difference also mod your airbox and get it jetted

 

get a 450.

 

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What he said!!! or get like a 350 bore/stroker and cam... another thing is you could make the fat lady go on a diet and tear out everything it doesn't need...

 

Since we're all touchy today my comment was tongue-n-cheek. But that is an option.