By: Chris Hodkinson
Every
once and a while a product comes along that you just have
to have because it looks great. The new ESR 2 pc Head
for the TRX250R is one of these products. Its not often
that you can buy a bolt on part that is both power
enchancing and looks great. This is an exception to the
rule though.
 Based on the same concept as
the
Pro Design Coolhead, the folks at ESR added a couple of
new twists of their own. With the ESR 2 pc head you
still have the added advantage of greater cooling
capacity along with the ability to change domes to meet
your compression needs for the fuel you will be burning.
This is one area that ESR has made subtle changes. With
the other 2 pc heads on the market, if you want more
bottom end power you simply order a smaller CC dome to
raise your compression or if you want top end a bigger
CC dome to lower compression and increase Rev's. With
the smaller CC  dome you will also have to run race gas
while the larger CC domes you run pump gas. To get the
motor to run on pump gas you could be sacrificing low
end power that you don't want to lose and vice-versa for
the top end. Eddie has taken this a step farther to help
compensate for lost power at either end of the power
band and you can still pick your choice of fuel. It has
been found that a wider squish band width will increase
low end power while a narrow squish band width works
best for upper RPM running. So what Eddie does for 
each
size CC dome is make 2
different variations . One with a wider squish band
width for low end and one with a narrow width for upper
RPM motors. While this creates a little more work for
Eddie and his CNC machines it gives him and his
customers greater flexability for their motors.
 You
can buy this head from ESR with your choice of 3 colors
(Anodized Red, Black, or Unfinished). Another nice touch
that is built into this head is that on the head stay
they have put a slotted hole through instead of the
standard round hole so that if you are running a spacer
plate motor you can still use the top motor mount.
The ESR 2 pc Head is available
for both the OEM TRX and LA Sleeve Pro-X cylinders. If
you are looking to improve the looks of your quad and
increase performance at the same time we suggest you
give ESR a call or email them
to see what they can do for you.
 Eddie
Sanders Racing
1510 E. Main St. Unit C
Visalia, CA 93292
Phone: 559.625.3157
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