exhaust question

[mud91]

my banshee has these mods; .40over, 35mm keihns w/pods, +4, coolhead 20cc, wicked hot trail port, Pro circuit plats..

 

how would fmf fatties react to what I have know:

 

dmc :

 

t5's:

 

right now the midrange pulls like crazy..just looking for little more on mid to top..I didn't mention cpi/shearers becasue i can't affort them right now..

[Snopczynski]

You have a problem here. If you truly have a trail port, going to a mid-top exhaust is going to narrow your power window and take away bottom end, and then start robbing the lower part of the midrange. You have way too big of a carburetor for a trail port and for running pro circuits. You should be down around 28-30mm's (pro circuits peak at 8,800 rpm). I would imagine right now your missing out on a bunch of bottom end with such a big carb, and the throttle is probably not as crisp as it could be. To do this right, you need to have the cylinders re-ported so you can use the full potential of a mid-top pipe.

Edited January 28, 2010 by Snopczynski

[mud91]

You have a problem here. If you truly have a trail port, going to a mid-top exhaust is going to narrow your power window and take away bottom end, and then start robbing the lower part of the midrange. You have way too big of a carburetor for a trail port and for running pro circuits. You should be down around 28-30mm's (pro circuits peak at 8,800 rpm). I would imagine right now your missing out on a bunch of bottom end with such a big carb, and the throttle is probably not as crisp as it could be. To do this right, you need to have the cylinders re-ported so you can use the full potential of a mid-top pipe.

I just bought this bike a month ago and it does have a wicked trail port, just right below is dune port. Your right I did notice the the bottom end bogging..i did adj the air screws and seemed to help with 2.5 turns out compared to they were bottom out..it acutally pulls hard..but then again never had a ported banshee..I can say this, last weekend I raced alot of 450's w/exhaust, intake, programmer on a 260ft sand drag set up here at the local track. almost everytime they took me off the line, pulled them in around half track and won 1-2 bikes length. their was one 450 rider that weighed 125 lbs that actually beat me one time but I was pulling on him after a bad start..i weigh 250 by the way...I guess I just wanted to try a different pipe with my setup what it boils down to..

[firebanshee]

It's hard to beat a good old T-5s. It sound like you like to race and the pipes that you listed i like the T-5s, I used to run them alot. They are a good mid to topend pipe.