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New 2011
Yamaha Raptor 125 ATV HMF Performance
Exhaust
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Brookpark, Ohio (3/4/2011) - HMF
Performance just launched a new exhaust for
the brand new 2011 Raptor 125 sport ATV. Because
of the Smaller CC engine, the HMF Competition
Series Exhaust does not feature the Tri Max
Core. It has the Performance Series core.
The exhaust comes in Black, Blue, and polished.
We tried 4 different head pipe designs along
with 3 different silencer designs before coming
up with a combo that made good power across
the board.
By simply bolting our full system up to the
little Raptor we saw a 15% gain in power.
After seeing how choked up the intake side
is, we removed the air box lid, backfire screen,
and added a K&N filter with Outerwear.
We found the stock carburetor was not up to
the task of supporting the increased flow
of the new exhaust and air box/filter modifications.
The Keihin PE28 Carb was dropped in place
of the original. After some fine tuning, we
saw a 30% power gain over stock.
We put together an engine package that would
increase compression from 10:1 to 11:1 with
a Wiseco stock bore piston, Stage 1 Hotcam,
and ported cylinder head. Even with this relatively
mild combo, we peaked out at 10.92 horse power.
That’s a 41% power gain over stock!
The Engine Kit is available through HMF.
There's a lot of things you can do in addition
to the exhaust to increase the overall performance
of the Yamaha Raptor 125. We have a number
of tuning products available through HMF for
this. We also have an Engine kit to take it's
power to the ultimate level.
The Yamaha Raptor 125 slip-on retails for
$289.95 and the full exhaust retails for $339.95.
For more informations about the new Yamaha
Raptor 125 Exhaust or any of our other HMF
products please visit hmfracing.com.
