I am looking to buy a big bore kit for a 350 Raptor. Have any of you tried one , if so how well did it run? Also where can I buy one?

 

FOUR STROKE TECH 446 IT WOULD RUN VERRY WELL IM SURE there's a few guy's on here with 446's..

 

How big do you want to go? If you keep the stock cylinder you could go with the 10.5:1 compression 366 kit from JE for $200 from Vito's or just about anywhere. Or as mentioned above you could get the 446 kit from FST (fourstroketech.net) is a good kit for around $1400 installed. I have had both kits and although the 446 is awesome, I would go with the 366 kit for reliability and cost. In drag races I have beat modified 440EXs with the 366 kit along with other head mods, which I thought was pretty good for a Warrior. The 446 kit is not a whole lot faster than the 366, it's just a lot more torquey and will allow you to pull wheelies in 5th gear.

 

can you order the 446 kit uninstalled? if so how much does it cost?,, and do u know how much of a hp difference the 446 kit made compared to stock? thanks

 

The 446 kit already comes uninstalled. Go to fourstroketech.net for details. I think it is $750 and comes with new crank, cylinder sleeve, piston and gaskets. You have to send him a stock crank before you will get a stroker back from him. To install the kit you have to tear the engine completely apart and have the bottom cases milled to clear the new cylinder and crank. Then you have to have the new cylinder pressed in and bored out. I think it you will go from around 29 HP to about 40 HP, but I'm not not 100% sure about that.

 

go ahead and get the 446 from FST. He makes great stuff.

 

does anyone know how much hp gain the 366 will give u, and what is needed to be done besides gettin the kit, what kinda engine job?

 

i have a warrior with a big bore to a 370 and hp gain is alot and i like it mine redlines in 6th going up hill so i say its good.

 

My honest opinion is unless you really really really like your raptor 350, just sell it and buy a raptor 660 or 700. By the time you get that kit, get the machine work done on the cases, and do the other necessary modifications to actually take advantage of the bore/stroke kit, you'll have more money invested in it than it's worth. You'll probably get about 38 horses out of the 446 kit with a good cam, intake, exhaust, and port job working for you, but that stock suspension would still render all that power useless. So then you toss another $1500 or more to make the suspension worthy of the power, and you probably easily put $3,000 into your raptor 350. Or you could just sell the raptor 350 for about $3,000, and put that money towards a raptor 700 that in stock form would easily blow the modded 350 out of the water in every category, and be more reliable while doing it. I like the 350's and it's cool if you want to dump a bunch of money into it, but I'm just giving fair warning that you're jumping into a money pit if you start modding a 350.

And about these 366-370 "bore kits". They truly aren't a big bore kit at all, they're just selling you a .80 overbore piston and calling it a big bore. The power you gain from the actual overbore is very minimal, you'd be lucky to squeeze half a horsepower out of an increase in displacement that small. Where the power really comes from in those kits is from the increase in compression, so you're better off just saving your money and your cylinder walls, and getting a standard bore high compression piston instead.

 

Just get a high compression piston and a good cam and better valve springs and a pipe and that alone will make you smile for a whille..