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DT125R Forum -> Tuning -> airbox top cut off
Post Info TOPIC: airbox top cut off
the only way is YAMAHA DTR


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airbox top cut off
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http://billsrebuilts.com/shop/index.php/shop.html?page=shop.product_details&flypage=flypage.pbv.v1.tpl&product_id=4795&category_id=83

http://www.3pracing.gr/listing-REED+VALVE+SYSTEM+WR200-13.html

 

 

hi, the website says that this fits dt200 and wr200 which apparently has the same

 

bottom end as the 125

does anyone one know for certain that wr200 and dt200 reed valves will fit my dtr125



-- Edited by the only way is YAMAHA DTR on Monday 9th of May 2011 09:05:13 PM

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DangerousDave87


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RE: V force reed valve for DTR????
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wrong section mate, should be in engine n tuning. there's a link in the useful link section that lets you find other bikes that use the same part so you could try that

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right found a v-force reed valve that fits



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spadge


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awesome let us know how it goes

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gooner78


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If it works well i'Il definatly want one i had 1 on my rm 125 it made it alot crisper

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will do just gona cut the top off my airbox and make it like a yz one and up jet:)



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DT-R_bradders


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can we have a pic of ur yz airbox?? : D

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the only way is YAMAHA DTR


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will get a pic of the airbox when i cut it but waiting for the new jets first are these the right ones http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=230615005605&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en

 



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DT-R_bradders


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So the big hole ur on top is wat it looks like wen It's all together in the bike?

And tht jet is the for our carbs m8 well the flat slide anyway

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NathanDavies


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very interested in this!!



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ok did airbox modd 2day and drilled the jet original 240=1.35mm

sounds like a yz250

alot better at holding the powerband when changing gear would recomend



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NathanDavies


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RE: airbox top cut off
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So the Vforce reeds for the WR/DT200 fit as they should yeah?

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mammoth200


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Could we get a complete run down of your whole set up now please lad? including carb jetting and all other mods :)

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jack_p92


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mammoth200 wrote:

Could we get a complete run down of your whole set up now please lad? including carb jetting and all other mods :)

 

 

+111



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well they will fit in the holes may need a tweek  but the guy in greece i spoke to said it fits the 125



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NathanDavies


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well what have you fitted then?

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the only way is YAMAHA DTR


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drilled 1.6mm on main jet



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porky-dt125


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where u get that reed block bud r u wanting to sell it

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rob patton


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did them v-force reeds fit and was they for a dt200 and wr200 ????

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they will fit but i havent bought them



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jack_p92


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been reading about 2 strokes, this is a bad idea drilling the airbox bigger, a 2 stroke needs back preshure in the airbox for it to run right. Only works on 4 strokes.

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jack_p92


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no way, small world then!! Unfortunaly ive not heard many good things about there tuning packages, and a few times they've caused major engine damage. However the upper strut brace they make is the best in the business!

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rob patton


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i did not cut it all out but i drilled a BIG hole today :p lol

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ok, cool bet it sounds nicer, did u re-jet it ?



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porky-dt125


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What's the results for the airbox mod

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MartZ0r


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i bet that sounds beefy. back pressure is needed but as long as theres some and its jetted properly should be ok id have thought.

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i understand why backpressure is needed but dont understand why some motocross 2 strokes have open top airbox standard yz125 and 250 (newer bikes) example



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MartZ0r


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like you say, open top box. they still have a box only bigger volume. back pressure is still there only a little less. re-jetting compensates for it.

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DT-R_bradders


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surely you dont have "back pressure" ie positive pressure, in the airbox u have a vacuum in there ie negative pressure as the throttle is opened the engine sucks in air leaving a vacuum in the airbox because of the small opening in the top of the box especially with the snorkel on , so if u wer to lop the top of the airbox off u will drasticaly reduce this vacuum no?? and i would think that opening the box up would benifit as ur not slowing the air intake , so the engine can rev up a bit more freely, as with the vacuum in the airbox ur effectively putting more strain on the piston on the "up stroke" as its fighting against the vacuume trying to suck air in???

jus want to clarify this as it doesnt make sense to me..

does this post make sense to anywon else??



-- Edited by DT-R_bradders on Friday 3rd of June 2011 07:24:05 PM

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porky-dt125


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Exactly wot I thought it's like havin an induction kit but less risk of it getting soaked as it's partially covered still

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