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By: Chris Hodkinson

ESR LogoMicro-Midgets Sprint cars and Quads are two totally different beasts.  One is designed for Flat track oval racing while the other is better suited for MX, TT, Desert racing, and the dunes.  The one similarity between the two is that in many cases they are both powered by the famous TRX250R powerplant.  In the case of the micro midgets Eddie Sanders Racing (ESR) has been on top for many years now.  Eddie Sanders held one of the coveted spots racing for Team Honda.  After retiring he started to build motors for the TRX250R riders in the no longer existent MTEG Series.  Turning his focus towards the micro midget series Eddie quickly made a name for himself as the premier motor builder for these Honda powered cars.

As most people know the easiest way to get more power out of a 2-stroke is to get rid of the stock pipe and put an aftermarket one on.  Pipe technology for the TRX250R has been pretty stagnant the last couple of years with only a small handful of companies really coming out with a new pipe.  ESR happens to be one of them.  Could the same dominance they achieved in the micro midget series be carried over into the quad division?  Our readers needed to know, heck we needed to know as we are always looking for ways to get more performance out of our TRX250R.

We placed a call to ESR and got the info we needed to determine which pipe we wanted.  Right now ESR makes 4 ESR Pipe in-frame pipes.  The TRX-5 pipe is for TT or Drags while the TRX-6 is for woods or MX.  There are also 2 styles offered for these pipes.  Either you can get the traditional in-frame style that bolts up in the same position as the stock exhaust with the silencer mounted to the right of the grab bar.  Or if you live in an area where mud, water, or snow is not a factor you can get the Center mount style.  It is the same pipe but now it exits back through the middle of the quad.  This style of pipe has a slight gain in horsepower over the traditional mounted pipe as the stinger can be made quite a bit shorter.  The only draw back to this pipe is you have to remove the airbox and run an open filter.

ESR sent us the traditional mount TRX-5 pipe as we like to drag race our quads but we also do some trail riding where ESR Silencerwater is a factor.  When the pipe arrived the first thing we pulled out of the box was the silencer.  The detail on this silencer is amazing.  No flimsy welded on mounting tabs on this silencer.  There is more detail in the laser cut mounting tab then in most pipes.  When we pulled out the pipe we found the same craftsmanship that went into building the silencer was also used in the pipe.  Every weld at the joints and spring tabs were perfect.  No gobs of weld or tiny pin holes at the joints. 

Mounting the pipe is a breeze.  The only tools needed are a spring puller (pliers or vise grips will also work) plus 2 - 12mm wrenches if you are still using the factory nuts and bolts.  On every joint we use hi-temp copper silicone to make sure the joints won't leak.  We're not saying that this pipe leaks as we never tried running it without the sealant.  We have just found it is easier to seal the pipe the 1st time instead of taking the chance and then having to pull it back apart, clean it all up, and then seal it.  Once installed we were pleasantly surprised to find out that this is the only pipe we have ever put on that did not hit any part of the frame or radiator hose.  Finally someone got it right. 

Another thing that we always do upon installation of any new product that affects how the motor breathes is richen the jetting up.  After a couple of jetting runs we dialed in our Lectron carb in using our Digatron EGT.  With the use of this gauge it is a lot easier to get a feel on the jetting with the exhaust temp and what the motor is actually turning with the tach. 

ESR here we come!Once warmed up we went out for some hot laps on our oval practice track.  We were pleasantly surprised at the throttle response with this pipe.  Even though it is designed for upper RPM riding this pipe offers a lot of roll on power down low.  The throttle response was not much different then most midrange pipes out on the market for roll ons.  The big difference was the topend power.  Where most pipes sign off for the R, even topend pipes, this pipe just kept pulling.  Most Hi Rev pipes require a lot of shifting to keep the quad in the right RPM range to get the most out of the pipe.  This one on the other hand has enough power to pull the gear longer if needed and let the power drop off more before shifting down is required.  The powerband is not peaky and is easy to ride.  No more getting overly tired because you have to constantly shift to keep the pipe in the meat of the powerband. 

If you are looking for a pipe that has tremendous topend Rev capabilities without lacking a midrange punch this is definitely a pipe worth taking a look at.  For the average rider who wants to loaf around the trails or do some fast MX racing the ESR TRX-6 would be a better alternative, but if Speed is what makes you happy  we have seen the ESR TRX-5 pipe as an excellent choice.  If you live in the dunes you may even want to run the ESR TRX-5 Center mount to gain that little extra advantage.  Plus you are sure to draw some looks when you pull up beside another quad and the exhaust is exiting out the middle of the frame.  The cost of the Traditional TRX-5 pipe is $209.00 for the chrome and $194.00 for the unchromed plus $89.00 for the silencer.  For the Center mount version it is $285.00 for the chrome and $270 for the unchromed.  This price includes the pipe and silencer.  For the ATC 250R owners do not feel left out as ESR also makes the same pipes for the 3-wheelers.

Eddie Sanders Racing
1510 E Main ST   Unit C
Visalia CA  93292
Phone: 559.625.3157

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