440 kit

[HPI_Savage25]

Just installed a Magnum/Namura 89mm 440 big bore kit on my 01 400ex.

Going to rejet it and also put a different exhaust on it for the time being (until the guy pays for this one).

Anything I need to know about it? Going to let it idle through a tank then do another tank of no more than 1/2 throttle.

K&N air filter also installed.

Thinking of grabbing some air scoops also to help cool it a bit better.

Thanks!

[bkelley]

Idle through a tank? You do realize these are air cooled machines, right?

Give it a couple heat cycles, letting it cool down in between each one. Then go ahead and run a tank through it alternating between 1/4 and 3/4 throttle.

[honda400ex2003]

agreed with B. do some cycles on it and it will be fine. steve

[HPI_Savage25]

lol I guess I should have been more precise with how I worded that. I meant let it idle through a tank but letting it warm up then cut off and let it cool down fully then repeat for a full tank....

[T-Chad24]

I put a 440 kit in my 08, and my suggestion wuld be to put a bigger front sprocket! The 440 adds way more to low end but it levels out to soon on top end, well around 3rd, 4th gear.

[HPI_Savage25]

The track that I race at right now I am never going down into first....everything is 2nd gear. No lie I can ride it ALL in 2nd. Although I would like more bottom end in 2nd I still stay in 2nd to keep from messing the 1st gear up and 1 less shift to worry about. With the 440 I hope to be able to have more low end that I am looking for while still being able to stay in 2nd or 3rd throughout the whole track.

[honda400ex2003]

I would suggest a stage 1 hotcam for some more low end torque or at least a lower end exhaust like a t-4 or something with bigger numbers at 300-5000 rpns. steve

[HPI_Savage25]

I'll have to find out what exhaust the guy put on it. The shop had an exhaust from another 400ex and he said what it was but I forgot but he said it will work for now and be better than stock.

[honda400ex2003]

sounds cool dude, anything is better than the overweight stock one. have fun with your new 440 and hold on tight. steve

[HPI_Savage25]

You're not lying on the overweight part! OMG I picked it up when I took it off and was shocked how much that thing weighed....I think they made it out of pure lead! LOL

[honda400ex2003]

its too bad they didnt at least it would be worth something once you take it off LOL. oh god i am on a roll today. lol. I gotta stop this nonsense. I was terrorizing the open forum a bit ago. lol. :eek2: steve

[HPI_Savage25]

Picked up the quad today and then headed to the track, worked for a few hours then rode a good bit. Needless to say, the power increase is NICE. Love the new setup.....much easier to ride on the track. I did notice it runs hotter than before though, which I expected it to. Going to grab some air scoops for it soon.

This is the exhaust that is on it...
http://www.supertrapp.com/product_sections/detail.asp?CatID=25&ItemID=633-3402

Love it, but will probably be having to actually buy one pretty soon.

[honda400ex2003]

Glad to hear that it came out good and you are happy with it. Steve

[440ex. ehhh!!]

Nice job HPI. i have a 440 kit on mine also and it's crazy. pretty sure i have the stock cam in, i bought it the way it is now. so i dont know too much about internal parts, all i know about it, is its a 440 sleeve kit with Wiseco piston. Is there a way to tell if it has a hot cam without tearing it apart? should it say on the end of the cam?
and YES it get extremely hot riding in sub-zero temperatures, i can feel the heat of the engine through my boot and gear. :cool: PLUS i am running Lucas Oil synthetic in it too.