ATVPT

Product Review	Product Install
HMF Coupon

HMF Kawasaki Prairie Utility Series Performance Muffler.

All products used in this Field Test and Review by ATVPT have been supplied courtesy of HMF Engineering & CPW-Carb Parts Wharehouse.

We are in the middle of our 650 Kawasaki Prairie project. We knew we had to have the HMF Utility Series Performance Muffler to make this a complete package. Remember when adding a performance muffler system, you must change the jetting on your ATV, so your motor will not run too lean. One of the reasons for picking HMF along with some of the other available muffler choices, is the fact that HMF is totally American Made. We also like this product because it's designed for performance tuning of your ATV.

Keihin Jets were supplied by CPW_ Carb Parts Wharehouse to allow us tp properly re-jet the carbs on the Kawasaki 650 Prairie project bike.

Features:

- Max Power increases
- Max Torque increases
- Spark Arrested
- USFS Forestry
- Quiet Core Available
- Jet Kits Available
- Race Tex Pillow Packing
- Billet Quick-Change end cap
- Stainess steel headers
- Aluminum Canister
- 2 Year Warranty
- Color Series Available

Spark Arrestors

- USFS Approved for use in areas where required
- Easy to install, only takes a few seconds
- Easy to maintain; clean with oven cleaner and a brush

Quiet Core

- Decreases the dB level to acceptable riding areas limits (approx. 96~98 dB)
  - Includes a built-in USFS approved spark arrestor
  - Easy installation, only takes a few seconds
  - Keeps you legal in sound sensitive areas

Product Review
Product:	- HMF Utility Series Performance Muffler
Machine:	- 2003 Kawasaki Prairie 650
Review Date:	- December 2006

Introduction:
	I have several modifications on my machine including: CDI, air box modifications, high flow air filter, etc… None of my modifications are internal and the machine is considered by most, stock.
First Impression:
	I will be testing the HMF Utility Series Full Exhaust (Black). This exhaust system was built with quality at a high priority. The header pipes are clearly larger than the factory pipes and they are made of stainless steel. The header clamps also appear to be of high quality. When installing this exhaust system, I had a grin the entire time knowing that I was installing a quality product. I hope the HMF Full Exhaust System performs as well as it looks. This muffler is not for the faint of heart; it has a very aggressive sound and may be disturbing to some.
Field Test:
	Right off, I had to re-jet my carburetors to compensate for the improved air flow. HMF states that you have to jet accordingly in order to maintain the factory 2 year warranty. I was already running larger main jets due to some other modifications and a different aftermarket pipe. With the HMF, I had to shim the main needles out and step up one more size on the main jets. I ride in some hot weather and usually my fan runs quite a bit. Now that I am running the HMF, the fan is running noticeably less. In the past, I have run other aftermarket and modified pipes on the Kawasaki 650 and have had no noticeable power gains. I have to say that I did notice a power increase with the HMF and when the quiet core is removed, the power gain is even more noticeable. If you like loud, this is your pipe. Personally, I am very happy that HMF makes a quiet core for their exhaust systems. I do like to remove the quiet core at the sand dunes where the extra power is welcome and the noise pollution is not an issue.
Long Term:
	I have put over 1,000 miles on this pipe in all types of extreme environments ranging from below sea level up to 12,000’ in elevation. The headers are in great shape and the canister is also in great shape. I am very pleased with the performance and stamina of this HMF product.

Pros:
	Top notch quality
	Stainless Headers
	Increased Air Flow Resulting in Increased Power
	Optional Quiet Core
	Low Maintenance
	2 year warranty
Cons:
	None

Bottom Line

If you are in the market for an aftermarket exhaust for your ATV, I highly recommend that you look at what HMF has to offer you.

Note: Product for this review was provided by HMF Engineering.

Install by Patrick S.

Remove the Stock Kawasaki Pipe & Muffler and Replace with The HMF Full Utility Series Exhaust System.
I removed all the plastic to make it easier to install the full system. If you were doing a slip on installation, I would not remove so much of the skin.

Put a little WD-40 on your bolts, to free them up before removal. I started by removing the muffler clamp first.

Remove your rear pipe header bolts, muffler bolts, and your front header bolts, and you are ready to remove the system.

I removed the muffler first and then removed the front head pipe. Remember to remove the heat shield off of the front head pipe. This needs to be installed on the new HMF head pipe to deflect the heat away from your leg.

Installation:

Just loosely install the rear header sleave first and remember to put the donut gasket on before you install this piece. Then get your front header pipe in position.

I just loosely fit everything together, and make sure everything fits right. Notice how you can adjust the pipe's length on the rear header sleave.

Time to install the muffler, bolt it to the rear bracket, and then tighten your rear header clamp.

Make sure your clamps are positioned so they give you maximum coverage of your header pipes so they seal properly. Tighten down so they do not leak. Make sure your header bolts are tightened down so they also do not leak.

The only piece left to be installed is the head shield on the forward header pipe. Don't forget this, unless you want a hot leg from the exhaust heat. This is a very clean system that HMF has designed for the Kawasaki Prairie! Notice the 2 into 1 header design. Also notice how nice the muffler is tucked close to the rear frame, away from flying wheel debris.