i have heard that v force reeds are the best
will they make a noticeable differance
how will they affect jetting
i have been told they flow more gas
also i have heard the 38mm mtx carb works better than stock
will this carb be better and is it to much for a mild woods rider
does anyone use this combo with a pipe
thanks for any input.

 

I personally like the V Force reeds, I think as far as the carb goes I would go with a 39 PWK, and when you get the carb you can jet it properly. just my $.02

 

One of my 400 Polaris's is stock with all the add on's below.

No port work, stock piston for 2 years of hard running, just the pipe and stock silencer now, V-Force 2 peddle reeds, 44mm carb, K&N air filter and HPD clutching. I have the jetting at 300 main and its a little fat.

I was told by a few that this wouldn't run well at all, but it does, it flat fly's, it wheelies like nothing even at 15-20 mph and it still pulls up. I pull a 5' Trailmower with it also to mow my property.

Go with a larger carb for mods later, it is still easy to woods ride. I think I am going back to stock front spring. The high engagement is a little much with the HPD Red/silver strip.

 

I would het a 39mm pwk way before the 38mm. I'm also having real good power with a ported stock reedcage and a $40 set of boyesen reeds. I have both a Vforce and stock ported. I think I'm gonna use stock ported from now on.

 

I agree with the rest of the guys on the carb. The 39 is supposed to be better than the 38.
The boysen rad valve was the first mod I did to my 4x4, back in 99. I think I gained approx one bike length. over my buddy on his stock 400 4x4.
Also, Dennis Packard told me that the boysen was a better valve than the v-force. Although i have always read just the opposite. So.... I had to compare the two. (Ive got the v-force on my racer) heres what I found - The boysen is completely made of aluminum, has a larger opening than the v-force, plus the boysen has a dual stage reed setup. Which is supposed to help out on the bottom end. The v-force is made of plastic and has single reeds.
My vote goes for the boysen.
My 2cents

 

hey thanks for the reply's
seems like the 38 mm tmx is not the best choice
i'll look into the other carbs

 

go for the rad valve or the v-force 2 with reed spacer,you didn't
need extra spacer on the rad valve tough,similar performance gains
and response ,ost too especially on a ported cylinder.