Hello all. I wanted to try and improve my air flow to the carb on my 85 250r. Never liked the 90 degree turn and the bumps in the rubber connecting tube. So I purchased an aluminum airbox for a TRX. I was able to get it installed with lots of little mods. A little grinding here, bracket removal there, turn the shock around, relocate the shock res. etc. Heres some pics.
We've all seen the stock set up.
Here's the TRX box installed. The rear mounts to the seat latch bolt. I had to taper the front mount of the box slightly. I ended up removing the factory air box mounts. I also remove the rear little cross bar the green wire grounds on. There are little notches in the box here and there.
From the front. Also shock has been turned 180 for hose clearance. Res. mounting bracket gone.
Carbs. view.
Most time consuming part. I started with a piece of 2.5 inch and a piece of 4 inch exhaust pipe. I slid the 2.5 in and marked it. Then I cut slots in the 4 inch and started pounding and shaping. Along with cutting,grinding, and welding. It turned out pretty good. Pic is in the early stages.
Done. Everything hooked up except a shock res. clamp missing in this pic.
I used cheap silicone tube from ebay to hook the pieces together.
Need to get a TRX sized filter next.
Underneath view.
All for now. Time to go ride.
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Originally Posted by 200x newby
