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Question for DLHamblin

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Would it be possible for you to explain to me the mods that you did to your TT-R250? I know you installed the Big Gun exhaust but I would like to know more about you air box mods and jetting. Where did your drill or cut holes in your air box? Jetting sizes? Man if you could...pics would be SWEEEEEET! Any help you could offer would be MOST appreciated. :cry:

Thanks-TTRBUTCH

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I will try and take some pic's Saturday and post.

Basically I bought a pack (of six) 1" diameter airbox vents (White Brothers sell them as does Uni-Filter; my dealer had them in stock). They are meshed vent plugs with blue foam to help keep dirt etc out.

I drilled six 1" holes in my airbox lid (toward the top) and glued them in.

I backed out the throttle limiter screw on the top of the carb to let the throttle open fully. (What you gain depends I guess on where yours was set).

I thne installed the complete Big Gun Quiet pipe (header and silencer) which was about 45 minutes including taking the old one off and two cups of coffee.

I started it and it was back-firing etc (which I expected it to). So, I dropped it off at Beechmont Motorsports here in Cincinnati on a Friday afternoonas their head mechanic is a jetting whiz (I've known him for years). Saturday at lunch he called and said it was ready. I didn't ask what jets he changed but will try and find out from him.

Starts, runs, idles perfect. It sounds nice but is not too load at all. We have had crappy weather since but I've ridden it around our neighborhood to get some break-in time and it pulls very well now.

Its still not a WR but definitely less stopped up than stock.

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Did you say the throttle limiting screw is on the Top of the carb? I thought it was the screw in the linkage down by the chock. The is a screw there that when you twist the trottle, the excentric moves counterclockwise (up) and the screw acts as a stop. Mine looks like it would allow another 20-30% if I removed it, but I don't want to remove it if I shouldn't and if it's not the right screw to remove anyway.

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Thats the screw. Its there to limit the throttle for noise (green sticker...) so technically in CA you shouldn't back it out, but who would know??? :cry:

I will take some pics in the morning and post of the screw, airbox cover and pipe.

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Ok, here goes:

Here is the airbox with the 6 vents installed:

http://home.earthlink.net/~dhamblin/TTr250/airbox1.JPG

Here is a pic of the vents:

http://home.earthlink.net/~dhamblin/TTr250/plug1.JPG

Here is the aproximate loc of the limiter screw (I couldn't zoom in any more without it getting blurry):

http://home.earthlink.net/~dhamblin/TTr250/throttlescrew.JPG

Here is nice pic of exhaust:

http://home.earthlink.net/~dhamblin/TTr250/ttr250sider.JPG

Another of my toy:

http://home.earthlink.net/~dhamblin/TTr250/ttr250side1.JPG

I took it on a jaunt down our neighborhood after taking these; still very pleased with it!

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Dave:

Thanks a lot for the imformation and the pics...VERY helpful. The airbox mods are really clean and slick, and that Big Gun exhaust system looks cool on that blue bike. I think Im going to finish braking mine in and then start to pump it up.Thanks again for all your help. :cry: Steve

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The bars look good!! I was out riding motocross again today and took a small rock to the headlight (no damage) and it got me thinking...It looks fairly easy to disconnect the headlight/numberplate so I was thinking of replacing it with a YZ numberplate for the daytime riding and mabye even the rear fender. Do they make rear fenders without the light notch for our bikes? The way I figure, it would only take 15 minutes to put the lighting back on the bike if I was gonna need them.

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Not sure; I don't think Yamaha does but maybe one of the aftermarket companies? It would invilve some checking and measuring but maybe a fender from a YZ could be made to work?

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