motor work

[foxracer5464]

hey guys im pretty new to this site and forum thing and i was wondering what motor work i should do to my ex i finally got the suspinsion and stuff done now its motor trime i plan on racing mx when i get it set up anything will be helpfull and is the 04-05 450r carb the way to go ???

[Colby@C&DRacing]

A lot of people use a 416 kit, cam, head porting, and a carb on the 400ex . These mods make a big difference in performance

[drew416ex]

I had a 416 and loved it. I could beat many of the 440's on the track. They 450r carb is a good option. Either that or a keihin fcr. Ive heard the 450 carb is easier to tune but ive never had any trouble from my fcr.

[foxracer5464]

hey drew did u buy a 416 kit if so who made it or did u peice it together

[TRXRacer1]

I just did the 416 myself. I enjoy more midrange power so I coupled my wiseco piston with a stage 1 hotcam. You don't really need a "kit" of any kind being that a 416 is done using a standard overbore 87mm size piston. There's a million cams out there as well as pistons. A stage one hotcam wouldn't be my first choice for MX but a stage 2 or 3 would work for you. You'll need a piston, oversized gasket kit, a cam and your cylinder bored at a minimum. On a personal note I wouldn't worry about porting the head quite yet. A lot of money for little gain IMO.

Talk to Colby@C&DRacing about the parts if you need a place to start. I bought my parts from Honda of Troy and RMATV.

[foxracer5464]

thanks trxracer1 is there a better piston to go with than others i heard weiscos are heavy and what not

[slim_shawn]

i have a 416. a weisco 11:1 piston, stage 2 hotcam and port and polished head and a 5 angle vavle job, with the stock carb, K&n filter and airbox lid. also with a full fmf exhaust. i can stay right beside a 450 with a pipe and filter no prob on a starght strecth, and in the trails i can lave him without even thinking about it, and he has more riding experience then me. IMO go with the set-up you are thinking about except get a stag 2 cam. you won't be disapointed

[TRXRacer1]

Originally posted by foxracer5464
thanks trxracer1 is there a better piston to go with than others i heard weiscos are heavy and what not

I've had such good luck with Wiseco that I've never tired any other but the JE and Ross pistons are supposed to be a bit lighter.

[foxracer5464]

thanks everyone this has been a big help i guess ill settle for the 416 weisco 11.1 hot cams stage 2 and a port and polish maybe the 450 carb could anyone give me a rough estimate on the machine work and where they sent theres

[gcart2]

hi comp piston (stock bore) stage 2 hot cam jetting and a pipe will make you cream your pants.