Exhaust for Top End

mgentz · February 23rd, 2013, 01:22 PM

I put this in this forum because people here are looking for the top end power.

So, does anyone know who makes the largest diameter headpipes for the 250 (mine is an 09), while still maintaining the stock bracket and hanger location? i.e. passenger peg

I hear leo vince...but I cannot confirm. Basically I am lokking for pipes as big or bigger than the area p race system, but I do not want the mid to high exit point.

csmith12 · March 2nd, 2013, 10:14 AM

@Racer x might be able to address this question.

Racer x · March 2nd, 2013, 10:42 AM

I have a Nojima pipe. It has a very large pipe diameter. But ended up using a first gen because all the new gen pipes go into the head, so 27mm is all you can get,

Racer x · March 2nd, 2013, 11:47 AM

This is a shot if the Nojima header next to what I believe is an area P or a knock off of one. the one in my hand is the Nojima
both pipes have the same size pipes but the Nojima is thinner tubing. much lighter
If you want top end you need resonance and scavaging. Everything like pulling the muffler or open exhaust hurts power. The engine seems to need a little back pressure, It is not a question of jetting for the open pipe. I have been on the dyno. taken off the muffler and seen the power drop off. Then tried jetting to get it back, I really don't know the answer to the best exhaust. But long tubes have worked the best so far.

csmith12 · March 2nd, 2013, 11:49 AM

Thanks yo! Interesting stuff.

iZapp · March 2nd, 2013, 05:54 PM

leo vince corsa gp pipe, dyno pulls by yours truly. like RacerX says, it likes the silencer insert.

mgentz · March 2nd, 2013, 07:14 PM

For now i think I'll keep my standard area p then. Hopefully this will work well in conjunction with my other mods to keep some back pressure.

KazMan · March 12th, 2013, 02:38 PM

What are you trying to do? drag? road race? ??

Remember also that these little motors can only move so much air/fuel so as has been mentioned, opening up too much will cost you power.

Do you have adjustable cam sprockets? This in my opinion, mated with a LeoVnce pipe has provided really good results over the winter.

mgentz · March 12th, 2013, 03:18 PM

road race and achieve max power.

KazMan · March 12th, 2013, 06:47 PM

Well, we found on the older Leo pipes and some of the other brands, that having the insert in the can created better numbers and power. All top end is ok to a point, but for me, mid-range is a great thing to have as it allows you to start off the corner sooner, thus making the straightaway longer.

Unless of course it was a track like Willow Springs or Daytona where you are spinning the top end for awhile.

Somchai · March 12th, 2013, 07:04 PM

Quote:

Originally Posted by mgentz

I put this in this forum because people here are looking for the top end power.

So, does anyone know who makes the largest diameter headpipes for the 250 (mine is an 09), while still maintaining the stock bracket and hanger location? i.e. passenger peg

I hear leo vince...but I cannot confirm. Basically I am lokking for pipes as big or bigger than the area p race system, but I do not want the mid to high exit point.

Didn't u read ur first post with the same question and its answers? http://www.ninjette.org/forums/showthread.php?t=124700

mgentz · March 13th, 2013, 04:49 AM

Oh yes I have read both. And both have seen some shared and some different opinions. The discussion is good.

February 23rd, 2013, 01:22 PM	#1
mgentz Board Member Name: ... Location: WI Join Date: Dec 2011 Motorcycle(s): 250R (street), 250R (dirt) Posts: A lot.	Exhaust for Top End I put this in this forum because people here are looking for the top end power. So, does anyone know who makes the largest diameter headpipes for the 250 (mine is an 09), while still maintaining the stock bracket and hanger location? i.e. passenger peg I hear leo vince...but I cannot confirm. Basically I am lokking for pipes as big or bigger than the area p race system, but I do not want the mid to high exit point.

March 2nd, 2013, 10:14 AM	#2
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	@Racer x might be able to address this question. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

March 2nd, 2013, 10:42 AM	#3
Racer x ninjette.org certified postwhore Name: Eric Location: Iowa City Join Date: May 2009 Motorcycle(s): 2008 Kawmeracchi 350 2010 Project X Posts: A lot. Blog Entries: 54 MOTM - Sep '18, Feb '16	I have a Nojima pipe. It has a very large pipe diameter. But ended up using a first gen because all the new gen pipes go into the head, so 27mm is all you can get, __________________________________________________ Top speed 123.369mph. Ohio mile Worlds fastest 250 ninja

March 2nd, 2013, 11:49 AM	#5
csmith12 The Corner Whisperer Name: Chris (aka Reactor) Location: Northern KY Join Date: May 2011 Motorcycle(s): 2010 250 (track), 1992 250, 2006 R6 (street/track), 2008 R6 (track) Posts: Too much. MOTY 2015, MOTM - Nov '12, Nov '13	Thanks yo! Interesting stuff. __________________________________________________ Goal: Shake A Million Hands \| Look through the corners \| Track Day Prep \| Closest track? \| The Mid-Ohio School

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March 2nd, 2013, 05:54 PM	#6
iZapp former ninja 250'er Name: Geo Location: NE Ohio Join Date: Jan 2013 Motorcycle(s): Aprilia 1000R, CRF450, CBR600RR tracktoy, Ninja 250 -- GONE!!!!! Posts: 153	leo vince corsa gp pipe, dyno pulls by yours truly. like RacerX says, it likes the silencer insert.

March 2nd, 2013, 07:14 PM	#7
mgentz Board Member Name: ... Location: WI Join Date: Dec 2011 Motorcycle(s): 250R (street), 250R (dirt) Posts: A lot.	For now i think I'll keep my standard area p then. Hopefully this will work well in conjunction with my other mods to keep some back pressure.

March 12th, 2013, 02:38 PM	#8
KazMan ninjette.org member Name: Eric Location: SF Bay Area Join Date: May 2011 Motorcycle(s): none yet Posts: 228	What are you trying to do? drag? road race? ?? Remember also that these little motors can only move so much air/fuel so as has been mentioned, opening up too much will cost you power. Do you have adjustable cam sprockets? This in my opinion, mated with a LeoVnce pipe has provided really good results over the winter.

March 12th, 2013, 03:18 PM	#9
mgentz Board Member Name: ... Location: WI Join Date: Dec 2011 Motorcycle(s): 250R (street), 250R (dirt) Posts: A lot.	road race and achieve max power.

March 12th, 2013, 06:47 PM	#10
KazMan ninjette.org member Name: Eric Location: SF Bay Area Join Date: May 2011 Motorcycle(s): none yet Posts: 228	Well, we found on the older Leo pipes and some of the other brands, that having the insert in the can created better numbers and power. All top end is ok to a point, but for me, mid-range is a great thing to have as it allows you to start off the corner sooner, thus making the straightaway longer. Unless of course it was a track like Willow Springs or Daytona where you are spinning the top end for awhile.

March 13th, 2013, 04:49 AM	#12
mgentz Board Member Name: ... Location: WI Join Date: Dec 2011 Motorcycle(s): 250R (street), 250R (dirt) Posts: A lot.	Oh yes I have read both. And both have seen some shared and some different opinions. The discussion is good.