BIg bore kit

[Gray33]

hello guys today when i got home from lifting i found a motorsports magezine that just came today and I was looking throught it and found a 480 kit for $650 dollars. What do you guys think aobut 480 kits.How much faster does it make your quad>? and is 650 a good price or can you get a better deal.? I am into trail riding and some mx

[Big Red Menace]

I know Max Power sells their 480 kit for $575 with a anti friction coated piston and gaskets. A 480 kit won't add much peak hp with out other mods but will add torque and power through out the rpm range that wil make it accelerate better for sure.

[TWISTED DINLI]

i have heard on here that a 470 kit is much more reliable than a 480 kit. just my .02:D

[Gray33]

hey do you know what thread that is sir>? Becuase i dont understand why a 470 would be more realiable

[Big Red Menace]

You never said what year your R is. In the 04-05's the 480's 97mm bore is plenty reliable. For the 06-07's 470, 98mm, is about all you wnat to overbore the stock cylinder. Beyond that you'll need an Ice Cube cylinder to maintain reliability.

[Gray33]

hey man mine is a 2004 red kickstart 450

[sandmanblue]

Originally posted by Big Red Menace
You never said what year your R is. In the 04-05's the 480's 97mm bore is plenty reliable. For the 06-07's 470, 98mm, is about all you wnat to overbore the stock cylinder. Beyond that you'll need an Ice Cube cylinder to maintain reliability.

Good info.

I believe the guy is referring to several companies that are offering a 04/05 480 kit using the stock cylinder. They have cylinders already in stock and just do an exchange. ESR is one that I know of, although Max Power can bore/plate your stock cylinder too. Actually, there's about 5 different companies that can do this right off the top of my head.

The biggest difference between them is the piston used in the kit. If I were goig to suggest a piston... Buy a kit that comes with a CP piston.

My Max Power 488 kit uses the 100mm CP designed for the CRF450(490). Single ring, lateral gas ports, coated and longer skirt, dual forced pin oilers... All the good stuff!

[pro-rider46]

if you want, save up some more and buy a nmotion 600 kit

www.nmotionatv.com

[sandmanblue]

Originally posted by pro-rider46
if you want, save up some more and buy a nmotion 600 kit

www.nmotionatv.com

Do you have one, or have you seen a dyno of one?

I called NMotion when investigating my current build and was not impressed with their knowledge or suggestions. They told me that I HAD to run +1/+2 valves and the Web Mysto (major radical) cam, in addition to their 12:1 piston in a 3 ring design.


It's like they just picked all the biggest crap they could find and said "use this"...