30 minute modification

little fish · November 5th, 2011, 09:43 AM

feel free to chime in on this one, just in case i did something wrong
yesterday i decided to do a little modification to the bike, to help it breath better.
i first took the mufflers off (and then ran it down the road to see how loud it was) (yes it's pretty loud)
then i modified the mufflers a little.....at first i wanted to take them apart so i drilled out the 4 rivits on the tip of the pipe .. but it wouldnt separate...so i drilled out the middle with a long drill. then where the 4 rivits were, i opened the holes up a bit. bolted the pipes back on and started her up....nice deep throaty sound!! sweet.

the second thing i did was hack the airbox ( i didnt like the 2 little holes for air to pass through) so out came the saws-all and hack-o -change-o...the air box is fixed.
all this took less than 30 min. would have been quicker if i didnt pull the pipes off. (but then i would have been able to get the shavings out either)
was going to post some pics, but i can't get on photbucket for some reason

Alex · November 5th, 2011, 09:45 AM

Have you made any jetting changes? Both of the mods you've done have made the bike run leaner.

little fish · November 5th, 2011, 10:08 AM

not yet thats in the plans ..i'll have to keep an eye on the plugs for a bit to make sure i'm not running too rich

Alex · November 5th, 2011, 10:09 AM

You definitely won't be running rich, you're running lean (i.e. - possible concern for parts at high revs high loads).

little fish · November 5th, 2011, 01:03 PM

yeah i meant rich or lean ( i forgot the "or lean" part)

little fish · November 5th, 2011, 01:08 PM

here's a pic of the exhaust mod

and the intake mod

setasai · November 5th, 2011, 05:59 PM

Changing the airflow so drastically, you should immediately notice some performance changes. Was there a real reason to wanting to make it "breathe" better? Did you not like the performance originally?

choneofakind · November 6th, 2011, 11:40 AM

If you get the chance, buy some hose, slit it up one side, and run it up along the edges of the holes you cut in your airbox lid. Either that, or just file it down really smooth. No need to risk having plastic shavings sucked into your engine.

here's what I mean with the tubing stuff. check out this video at about 2:05 and he is lining the edge of the holes he cut in his airbox with slit hose:

Link to original page on YouTube.

*edit*
you're going to be lean in at least the idle circuits and the mid range. You might also have to go up a size in the jets to get the top end at the right mixture. Talk to @Timon about how his jetting needs changed when he did basically the same intake modifications you did in this thread:
http://www.ninjette.org/forums/showt...ht=air+box+lid
*/edit*

alex.s · November 6th, 2011, 11:44 AM

sounds like a great way to over heat your valves

shiftyninja · February 19th, 2012, 11:07 AM

I was thinking the same as above. Plus I like how he is still clueless on rich or lean conditions, yet he does something that you should have at least a little knowledge in.

jasle · February 19th, 2012, 11:26 AM

DUDE, REJET!!!!! you will REQUIRE bigger main jets. also need to lift the needle or get a new needle. The bikes come lean stock anyways.

choneofakind · February 19th, 2012, 12:25 PM

@jasle, you're completely right.

I did this over thanksgiving, only my intake holes are A LOT cleaner (ocd about that), and I have slip-ons instead of hacking up my stock cans. The needles for sure had to be raised, and the oem 105 mains were lacking. I have 108's I'll be testing once I can ride.

alex.s · February 19th, 2012, 01:06 PM

Quote:

Originally Posted by choneofakind

@jasle, you're completely right.

I did this over thanksgiving, only my intake holes are A LOT cleaner (ocd about that), and I have slip-ons instead of hacking up my stock cans. The needles for sure had to be raised, and the oem 105 mains were lacking. I have 108's I'll be testing once I can ride.

raising needles only effects mid-throttle fuel ratio. for WOT, the only thing that matters is main jet size, float level and kinda the pilot system. needle height doesn't matter once you get to WOT

choneofakind · February 19th, 2012, 03:18 PM

I know alex. Like I said, the mains were lacking because it wasn't pulling hard enough at WOT, but with the needles raised with another washer, the mid-range was perfect.

I've never touched the floats because I've never had issue with low rpm wot bogging.

November 5th, 2011, 09:43 AM	#1
little fish ninjette.org member Name: Ken Location: middle Ga. Join Date: Oct 2011 Motorcycle(s): 2003 Nija, 1984 es200 ATC Posts: 44 Blog Entries: 1	30 minute modification feel free to chime in on this one, just in case i did something wrong yesterday i decided to do a little modification to the bike, to help it breath better. i first took the mufflers off (and then ran it down the road to see how loud it was) (yes it's pretty loud) then i modified the mufflers a little.....at first i wanted to take them apart so i drilled out the 4 rivits on the tip of the pipe .. but it wouldnt separate...so i drilled out the middle with a long drill. then where the 4 rivits were, i opened the holes up a bit. bolted the pipes back on and started her up....nice deep throaty sound!! sweet. the second thing i did was hack the airbox ( i didnt like the 2 little holes for air to pass through) so out came the saws-all and hack-o -change-o...the air box is fixed. all this took less than 30 min. would have been quicker if i didnt pull the pipes off. (but then i would have been able to get the shavings out either) was going to post some pics, but i can't get on photbucket for some reason

November 5th, 2011, 09:45 AM	#2
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	Have you made any jetting changes? Both of the mods you've done have made the bike run leaner. __________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)

November 5th, 2011, 10:09 AM	#4
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	You definitely won't be running rich, you're running lean (i.e. - possible concern for parts at high revs high loads). __________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)

November 6th, 2011, 11:44 AM	#9
alex.s wat Name: wat Location: tustin/long beach Join Date: Sep 2009 Motorcycle(s): wat Posts: Too much. Blog Entries: 5 MOTM - Oct '12, Feb '14	sounds like a great way to over heat your valves __________________________________________________

February 19th, 2012, 11:26 AM	#11
jasle ninjette.org member Name: Jason Location: Austin TX Join Date: Dec 2011 Motorcycle(s): 09Ninja250, Ducati Monster 800ie, Harley FXSTS,Rebel 250,CR144,KX85,RM85L Posts: 142	DUDE, REJET!!!!! you will REQUIRE bigger main jets. also need to lift the needle or get a new needle. The bikes come lean stock anyways. __________________________________________________ Thanks to: , DUNLOP, WHOOPIE RACING, 995 PAINTWORKS, South Austin Motorcycles

November 5th, 2011, 10:08 AM	#3
little fish ninjette.org member Name: Ken Location: middle Ga. Join Date: Oct 2011 Motorcycle(s): 2003 Nija, 1984 es200 ATC Posts: 44 Blog Entries: 1	not yet thats in the plans ..i'll have to keep an eye on the plugs for a bit to make sure i'm not running too rich

November 5th, 2011, 01:03 PM	#5
little fish ninjette.org member Name: Ken Location: middle Ga. Join Date: Oct 2011 Motorcycle(s): 2003 Nija, 1984 es200 ATC Posts: 44 Blog Entries: 1	yeah i meant rich or lean ( i forgot the "or lean" part)

November 5th, 2011, 01:08 PM	#6
little fish ninjette.org member Name: Ken Location: middle Ga. Join Date: Oct 2011 Motorcycle(s): 2003 Nija, 1984 es200 ATC Posts: 44 Blog Entries: 1	here's a pic of the exhaust mod and the intake mod

November 5th, 2011, 05:59 PM	#7
setasai ninjette.org certified postwhore Name: Brian Location: Detroit, MI Join Date: Jun 2010 Motorcycle(s): 2009 Ninja 250R Green Posts: A lot.	Changing the airflow so drastically, you should immediately notice some performance changes. Was there a real reason to wanting to make it "breathe" better? Did you not like the performance originally?

November 6th, 2011, 11:40 AM	#8
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	If you get the chance, buy some hose, slit it up one side, and run it up along the edges of the holes you cut in your airbox lid. Either that, or just file it down really smooth. No need to risk having plastic shavings sucked into your engine. here's what I mean with the tubing stuff. check out this video at about 2:05 and he is lining the edge of the holes he cut in his airbox with slit hose: Link to original page on YouTube. edit you're going to be lean in at least the idle circuits and the mid range. You might also have to go up a size in the jets to get the top end at the right mixture. Talk to @Timon about how his jetting needs changed when he did basically the same intake modifications you did in this thread: http://www.ninjette.org/forums/showt...ht=air+box+lid /edit

February 19th, 2012, 11:07 AM	#10
shiftyninja ninjette.org member Name: Thomas Location: AZ Join Date: Nov 2011 Motorcycle(s): 09' EX250J, 01' EX250R Posts: 33	I was thinking the same as above. Plus I like how he is still clueless on rich or lean conditions, yet he does something that you should have at least a little knowledge in.

February 19th, 2012, 12:25 PM	#12
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	@jasle, you're completely right. I did this over thanksgiving, only my intake holes are A LOT cleaner (ocd about that), and I have slip-ons instead of hacking up my stock cans. The needles for sure had to be raised, and the oem 105 mains were lacking. I have 108's I'll be testing once I can ride.

February 19th, 2012, 03:18 PM	#14
choneofakind ninjette.org certified postwhore Name: . Location: . Join Date: Feb 2011 Motorcycle(s): . Posts: Too much. MOTM - Feb '13, Feb '14	I know alex. Like I said, the mains were lacking because it wasn't pulling hard enough at WOT, but with the needles raised with another washer, the mid-range was perfect. I've never touched the floats because I've never had issue with low rpm wot bogging.

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