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The TTR250 FAQ web pages -> TTR250 -> Modifications -> Snorkel Mod
Post Info TOPIC: Snorkel Mod
yamaha42


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Snorkel Mod
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Trimmed the airbox snorkel inlet. As anticipated, the fuel screw was turned out to compensate (out about 3.75 turns now). The a$$ dyno feels a slightly stronger pull on bottom, but sort of falls off up top. Any Comments or concerns? I'm running an UNI air filter with a Mikuni vm28/486 42.5 pilot and a n102/221 135 main jet. I am going to get a bigger pilot, but should I get a bigger main as well? Needle in the middle setting



-- Edited by yamaha42 on Wednesday 1st of May 2013 11:24:39 PM

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TT-R250M


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Trimming the snorkel usually makes it run rich and does not usually help much (it didn't for me anyway). Try fitting a larger snorkel as in THIS THREAD.



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yamaha42


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I knew you had trouble with this mod as I have seen that post before. I was just wondering what others had to say or what type of luck they had. If I don't have luck after re-jetting, I'm, just going to order a new OEM snorkel.

 



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yamaha42


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Oops! Here's a better picture 

the extra wires are from the tusk enduro kit

airbox.jpg



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petenz


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It will run with out a snorkel ,  air box or even a air cleaner

just has to be jetted for what ever you have or don't have..

The best way to  re-jetting is to start rich & work yer way down..

you can notice the changes in the way the motor runs a lot more

easly...

 yer need a hand full..mains / pilots 

 



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yamaha42


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I am aware I need to rejet, but as of now I am missing the lock washer beneath the needle on the slide. I ordered a new needle set from partzilla so I will install that before I even start my bike again. As of right now, I have Mikuni jets installed. Vm28/486 47.5 pilot and n102/221 135 main because the previous owner install an UNI air filter.

OH and in cause you weren't aware, Mikuni jets are about 10 sizes bigger than yamaha/teikei. 



-- Edited by yamaha42 on Monday 15th of July 2013 02:07:23 PM

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