I have a 2004 dvx 400 with full ct pipe pro design air filter 162.5 jets and a needle on the 3rd ring. I mostly ride dunes and I need more power so I was thinking a 450 or so big bore kit. Which brand do you all recommend?

 

Big Bore kits are too much of a hassle.....Yes they give a good power increase but trust me you'll end up hating your quad if you end up having to take it in for a new headgasket once a month! That's what happened to me with my '03 KFX400 I loved it right on up till I put the 440 kit in (Magic Racing). My advice to you is keep the stock bore, go up to a High Compression piston, get both hot cams (intake, exhaust). These two together should give you as much go as a Big bore but with known of the hassle!

 

Oh just go with the Athena 434. It won't blow head gaskets as long as you do it correctly. It is a whole slip on kit and very reliable.

 

ive got the atena 434 and love it runs awsome

 

how much

 

I think 700 bucks.[img]i/expressions/face-icon-small-smile.gif[/img]

 

the athena 434 is well worth the money just make sure you install it properly and eveything should be great also i sure you already know this but you are going to have break the engin in again so go to www.mototuneusa.com look for break in secerts this will tell you the best way to break it in for maximum power thats what i did worked great well take it easy man.

 

i had a wiesco big bore 440 installed in my z400, its been over a month now and i havent had any problems with it....go with wiesco!

 

Hey everybody i wanted to know the same thing on which big bore kit to get I got a 2007 ltz 400 with hot cams.. CRD exhaust HMF slip on and a carb off a 450 i was thinking about getting a 500cc big bore kit or a custom made 536cc stroker i went to many websites and the 450cc bigbore kit and all the other kits up to the 510cc kit are within 1 horsepower..45hp to 46hp i need help on the hp wise and the best and most reliable kit to buy