raptor 350 riders how old are you?

[topdwg]

Cool, thanks...

 

[dave76]

The problem with the 450s is it's piston looks like a friggin pancake, there is almost no skirt, whick causes heavy piston side loading, meaning the piston wobbles, thats why a leak down test is needed because it'll pick cylinder wear also.

 

[carfanatic]

[quote:jmcc449w]Any one know what I need to fit the k&N?

Ridinfast03 how much maintence do you do on your 450? I didn't get a 450 cause they said you had to change piston and rings at least once a year.

Depends on what kind of k&n you get. If you get the junky stock replacement k&n all you do is pull of your airbox lid, take the old one out, and toss the new one in. The stock filter setup is flawed though, so it's best to go with a Pro Design kit. It's a little more expensive, and a little more work to install, but it can save you some headaches in the long run because you won't be getting dirt sucked through like the stock design can allow sometimes. If you buy a Pro Design kit it'll come with everything you need. To install it you just take the airbox off the quad, and take the stock filter out. Then you just screw an aluminum adapter into the airbox with 4 screws, (you will need to drill the holes). Then you just put everything back together, and the filter slips over the aluminum adapter and tightens down with a hose clamp.

Yeah, for the most part that statement about the yfz maintenance is bogus. Some racers may rebuild the top end every year or twice a year, but with normal riding and normal maintenance the piston and rings can last almost as long as the average 4 stroke. The only thing that accelerates wear on the 450's is that the piston doesn't have as big of a skirt as most 4 strokes. The only big pain in the ass with the 450's is keeping the valves in adjustment, I can't remember exactly how often they're supposed to be checked/adjusted, but it's definitely more frequent than on a 350, and with a 5 valve head and having to make adjustments by swapping out shims instead of just turning a nut, it can be a pain in the ass.[/quote:jmcc449w]

Can you still put a lid on the pro designs filter?? How much are these kits?

 

[yamarider]

Yeah, you can still use the lid if you choose to do so. It may require a small amount of cutting with a dremel to remove a little bit of the plastic webbing on the lid to make room, but you should be able to use it without much trouble.

 

[carfanatic]

sweet. Where is a good place to buy these parts for a good price?

 

[yamarider]

I think magicracing.com is the best place