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The TTR250 FAQ web pages -> TTR250 -> Modifications -> Modded my airbox .
Post Info TOPIC: Modded my airbox .
locky


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Modded my airbox .
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Decided to go with the air box mod as i was curious to see what difference it made. I already have a 52.5 pilot jet fitted and a 55 pilot jet incase it was needed but it seems to run great with the 52.5. 

The new hole in the air box measures 3.25 inches x 1.75 inches. Iv'e mounted the snorkel in a piece of flat plastic incase i wanted to reverse the mod.

20150509_165151.jpg 

The rubber around the hole is car door seal.

20150509_171724.jpg

I can refit the snorkel if i decided to reverse the mod. There's a 10mm lip left around the hole that i could bond the snorkel to.

20150509_171858.jpg

I took the bike out for a spin and done a plug chop, all seems well with the mods iv'e done biggrin.

1. Modded standard exhaust.

2. 52.5 Pilot jet.

3. Air box mod.

 



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2004 TTR250. White Brothers E series exhaust, modded airbox, rejetted, 13/48 c&s & many more mods..
peteBLUEttr


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Given you a bit more pull has it?

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Pete. South Somerset, England.
locky


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I think it revs slightly quicker Pete but probably a mixture of the recently fitted pilot jet and airbox mod. Think i'll notice more when out on the lanes.

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2004 TTR250. White Brothers E series exhaust, modded airbox, rejetted, 13/48 c&s & many more mods..
peteBLUEttr


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If you stick the snorkel back in you will silicone it?

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Pete. South Somerset, England.
locky


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I'd use some structural sealant, much like the stuff used to bond car windscreens. It sticks anything to anything.

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2004 TTR250. White Brothers E series exhaust, modded airbox, rejetted, 13/48 c&s & many more mods..
peteBLUEttr


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Yeah quite good that gear. Stixall is good too
www.tool-net.co.uk/p-346331/everbuild-stixbk-stixall.html

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Pete. South Somerset, England.
locky


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Yes that looks good stuff Pete looks very similar stuff.

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2004 TTR250. White Brothers E series exhaust, modded airbox, rejetted, 13/48 c&s & many more mods..
locky


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Went out for a few hours this afternoon and there is a nice improvement. It seems to pull better in the lower revs then revs a bit quicker through the rev range.

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2004 TTR250. White Brothers E series exhaust, modded airbox, rejetted, 13/48 c&s & many more mods..
Green Chile ADV 1


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Is it worth doing?

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locky


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Very much so if you want a bit more go, i'm more than happy with the results and glad i took the plunge to do it.

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2004 TTR250. White Brothers E series exhaust, modded airbox, rejetted, 13/48 c&s & many more mods..
PlumasDude


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Green Chile ADV 1 wrote:

Is it worth doing?

Haven't touched the pipe/muffler (US) but I did cut up the airbox and remove the snorkel and add twinair filter and I think it makes a real difference, especially at altitude.  Take off the seat and rev it up with the snorkel in, it sucks like a vacuum cleaner, I figure that can't be ideal.

I have yet to hear from a US rider/US bike who has fully uncorked (with new pipe) and rides above 5000 ft-- I'd love to hear the results/specs if someone has done this.  I don't see how you could go with a big main jet without being too rich (Jarrah's 52.5/150/Q4 set up notwithstanding). Guess I'm too cheap to buy a new pipe to play with, and/or just too old for the noise.

If you're a mile high or more this might be an interesting thread: http://ttr250.activeboard.com/t56242227/jets-for-high-elevation/.  The guy from CO doesn't say if he cut up the box or replaced the pipe but I assume yes and no, respectively (Dave from Colorado?).



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