November 5th, 2011, 09:43 AM | #1 |
ninjette.org member
Name: Ken
Location: middle Ga.
Join Date: Oct 2011 Motorcycle(s): 2003 Nija, 1984 es200 ATC Posts: 44
Blog Entries: 1
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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 |
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November 5th, 2011, 09:45 AM | #2 |
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Have you made any jetting changes? Both of the mods you've done have made the bike run leaner.
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November 5th, 2011, 10:09 AM | #4 |
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You definitely won't be running rich, you're running lean (i.e. - possible concern for parts at high revs high loads).
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November 5th, 2011, 05:59 PM | #7 |
ninjette.org certified postwhore
Name: Brian
Location: Detroit, MI
Join Date: Jun 2010 Motorcycle(s): 2009 Ninja 250R Green Posts: A lot.
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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?
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November 6th, 2011, 11:40 AM | #8 |
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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. |
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February 19th, 2012, 11:07 AM | #10 |
ninjette.org member
Name: Thomas
Location: AZ
Join Date: Nov 2011 Motorcycle(s): 09' EX250J, 01' EX250R Posts: 33
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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.
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February 19th, 2012, 11:26 AM | #11 |
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
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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.
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February 19th, 2012, 12:25 PM | #12 |
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@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. |
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February 19th, 2012, 01:06 PM | #13 | |
wat
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Quote:
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February 19th, 2012, 03:18 PM | #14 |
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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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