How reliable is this kit?.... and can i use it for regular riding like woods and Sand pits ? Thanx

 

With any big bore you are going to runn into reliabilty issues. I just read a post about a 440 kit and if I remember correctly, the rod was the "weak link" as for regular riding, I don't see why not. One thing though, why do you want to go so big if your just riding trails, why not get something thats faster to begin with and mod it from there.

 

Ok and what would be faster ?

 

Than a stock 400ex?, Allota crap is. 250R's, banshee's, raptors, LT250 and 500, tecate-4, and of course Cannondale. If you're looking for a good trail, dune quad, chanses are your going to want a Raptor, if you ever race MX though, your going to want a Cannondale. If you want to keep your EX, than I would say to get the 440 kit instead of 465.

 

From what Danny Underwood at Tom Miller Motor Sports told me, the 416 is about as big as you'd want to go for woods. As far as the rod, any time you upgrade from stock bore or stroke, you should toss the stock rod for an aftermarket rod. The other issue is the crank. When you get your new rod, ship the crank and rod out to have it trued and welded. This cure all lower end failures.

 

I had a 440 kit and one day i was riding and came to a stop went to start and wammmmm snapped the rod in half now i have aftermarket rod and and a 465...

 

Go with a 416. Never heard a single problem about it.

 

Well I currently dont have a 400ex but i have a 2000 Warrior And a 2001 426F I was going to sell both of the bikes to get something else, Yea i would love to have a 250R soo bad and get a 330 kit for it but Around here theres no place where i can get a good used one . I know my neighbor had a 400ex it felt pretty nice but it seemed slow my Warrior was next to him when we dragged. Then I raced a 2001 400ex and got smoked. But Im just looking for a new quad next year I've ridden the shee and raptor I had two diffrent rides on the shee one of them was boring in a sand pit and the other was in a field where i was soo scared to give it anymore throttle. The raptor felt nice but I really didnt give it what it had because of (reliability probs) so i too it easy it handles like a 400ex but feels like my Warrior and I like that the only problem i have with the raptor is Damm its too tall.

 

There are hundreds and hundreds of 440cc 400EX's running around with stock rods/crank. There is very little weight difference between the stock assembly, a 416, and a 440. About 20 grams. A dollar bill weighs 1 gram, so we're not talking about a lot of weight. A 465 piston would only be a bit heavier. And there are ways around a heavier piston assembly. Run the stock rev limit on the 440 and you'll put probably put less stress on the bottom end than a 416 with no rev limiter.

The key to making a 440 run well, imo, is making sure you have a big enough cam. The stock cam and XR cams are really quite mild, and won't allow a 440 to make power at the top of the rpm range.

Although a 400EX is a great fun bike, OregonMXracer is correct that there are lots of faster quads. I really feel that for anything but top-level mx though, it's excellent overall balance overshadows the out of the box mild power. It all comes down to what you feel comfortable riding.

 

i ride woods alot and i want a 440, but i've heard so many good things about the 416 that i want one of those too. so what i'm gonna do is compromise and get the 426. maybe you should do the same?