i just put an Aaen torquer pipe and silencer on my 96 400 Sportsman along with a Unifilter.I jetted the carb up from 210 to a 230 will this be enough or should i go up another step.Any in put would help because it has been too wet and cold to test ride it .

 

I recently put a HSP xplorer pipe on my 1993 350L and the manufacturer suggested going up 2 jet sizes on the main. I also added a K&N fitercharger, V-Force delta 2 reeds and a UFO.
I talked to my dealer about the addition of the new filter and reeds and he suggested going up another 1 size for these because of the increased airflow on the intake side. The UFO doesn't require a main jet change supposedly because it only affects idle and midrange settings.
The xplorer pipe I put on is a mid-range pipe and the Aaen torquer is a bit more of a lower range pipe, but I think the rejetting requirements should be somewhat similiar.
I think a 3 or 4 size increase would be about right. With the advent of much colder weather and the new air filter you might be safer going to a 240 or 250 and then do some plug readings to determine your final jetting.

Doug

 

Thanks for the input i think i will go with a 240 i would rather be a little rich than too lean.This pipe is supposed to pull hard from 5700 to 6700 rpms.i put in a green primary and a blue secondary spring before the pipe and it made a big improvement.hope the pipe does as much.How much did the reeds do?

 

I can't really tell what the new reeds did since I did most of my mods at the same time. New pipe, reeds and spacer, K&N filtercharger, and green primary spring where all done at the same time.
I've talked to several people since about the V-Force delta 2 reeds and they say you can accomplish the same thing by just adding some good carbon fiber reeds to your stock reed valve. I really don't think the cost of the new V-Force valve was worth it. I paid around $150 and replacement reeds are about $50.
I think part of it also is the way I ride my machine, usually just lumbering down mountain trails with my little ATV trailer behind me. If I used it more like a sport machine for racing and very aggressive high RPM running then the V-Force may begin to shine more!

Your rejetting sounds good, like you said it's better to err on the side of richness than risk running too lean.

Doug

 

One thing to remember about any mod which increases air velocity through the carb ie. filter, porting, exhaust pipe etc. Whenever the velocity increases in a venturi (carburator throat)the delta p exerted on the gas bowl goes up which will increase fuel flow automatically through a fixed size orifice (jet size).In extreme cases (much enhanced air flow from changes in engine displacement as well as air filter or porting) the actual jet needed could consievably be smaller due to vacuum increases.
I recently placed the same carb on a 425 cc engine which came off of a 365 cc engine. The 425 besides being larger displacement has much larger intake porting and cam lift as well. I automatically adjusted my needle setting ( its a Lectron with a fixed jet size, only the needle depth is adjustable) to a richer position. After 5 minutes of mild running I checked my plug and found it very much on the rich side. By the time I got the nice dusty tan I wanted I was 1/4 turn leaner than in my smaller engine.

 

THis was on my 400 2 stroke sportsman.And when i jetted it to a 240 it was as good as i could get run it all day when i pulled the plug it looked new.no black or white residuejust very little tan.