Tech Resources
Monday, May 16th, 2011
Our HMF Optimizer Fuel Controller can be difficult to understand if you're unsure of how to properly use it. Some models require specific instructions to ensure proper installation. Below you can find our general optimizer instruction sheet, as well as model specific Optimizer Instructions. GeneralHMF Optimizer Instructions Can AmCommander Renegade 500/650/800 Outlander 500/650/800 Spyder HondaRincon 680 CBR 250 KawasakiBrute Force 750... read more
Tuesday, February 22nd, 2011
When is it time to repack? We get this question a lot here at HMF. Typically, the average rider will need to repack their exhaust after about 40-50 hours of riding. This can vary however depending on the type of riding. More aggressive race machines are going to need to repack more often... read more
Tuesday, January 18th, 2011
For the little ones With the growing popularity of the small quads and economical scooters, HMF developed the Mini Series for vehicles with low CC engines. Add an HMF pipe to your scooter and you'll be able to feel and hear the difference instantly. Granted these vehicles are not out there to win races,... read more
Tuesday, January 18th, 2011
Sound Regulation The original quiet race exhaust, the HMF Quiet Race Series features an internal mechanical core that controls sound pulses and manages them to a minimum. With race sound regulations becoming stricter, every serious racer needs to consider the dB level of their exhaust. The Quiet Race Series’s core will help you meet... read more
Thursday, January 13th, 2011
Utility Power The Swamp & Swamp XL Series set a whole new standard for the horse power, sound, and durability an exhaust adds to a machine. The 304 Stainless Steel, 5” diameter shell gives the exhaust more internal volume producing insane horse power gains. The inlet is TIG welded shut for a completely water... read more
Thursday, January 13th, 2011
Increasing the Torque Backed by the ATV legend Mike Penland, the Penland Pro Series was developed for serious off road racers and trail riders striving to achieve more low-end torque. The removable Torque Range Modifier adds a low-to-mid range punch, allowing quads to hook-up better in rough conditions. The exhaust is made of T6061... read more
Thursday, January 13th, 2011
3 Exhausts in 1 Arguably the highest performing after-market exhaust on the market, the HMF Competition Series is a pure blend between optimized performance and versatility. The secret to it’s power lies within the Trimax Core. This unique triangular core accepts specially designed exhaust inserts that provide the rider the ability to quickly change... read more
Thursday, January 13th, 2011
All Around Performance Setting the standard for power and value, the HMF Performance Series has been track tested with over a decade of championships. The specially designed, unrestricted core provides maximum flow and allows the exhaust to increase horse power and torque evenly throughout the entire power curve. The trademark to the HMF Performance... read more
Monday, May 3rd, 2010
Exhaust Repack Instructions: Steps 1-4
Repacking your exhaust requires an air rivet gun or an automotive style riveter. A small hand riveter will not work for this. If you would like us to repack your exhaust system, see our Repair Services for details. Click here to download these instructions in PDF format. (1MB) Click here to view the video Repacking Instructions Step... read more
Monday, May 3rd, 2010
Exhaust Repack Instructions: Steps 5-8
Step 5: Using a 4mm allen key, loosen the allen screws on the end cap. Step 6: With the exhaust shell removed, discard of the old packing and wrap the new packing around the core. Step 7: When wrapping the packing around the core, make sure to make it as snug as possible. Step 8:... read more
Monday, May 3rd, 2010
Exhaust Repack Instructions: Steps 9-14
Step 9: Using a small screwdriver or pry bar, push the excess packing down below the end of the core. Step 10: Slide the core into the exhaust shell Step 11: Using a small screwdriver or pry bar, tuck the packing in the exhaust shell. Step 12: Push the inlet completely into the exhaust... read more
Monday, May 3rd, 2010
Exhaust Repack Instructions: Steps 15-17
Step 15: If you're replacing your badge, place the badge on the exhaust shell and line up the rivets. Step 16: Using an air rivet gun or automotive style riveter, secure the rivets to the exhaust shell. Step 17: Finally, tighten the allen screws on the end cap. read more
Monday, May 3rd, 2010
Exhaust Repack Instruction Video
Repacking your exhaust requires an air rivet gun or an automotive style riveter. A small hand riveter will not work for this. If you would like us to repack your exhaust system, see our Repair Services for details. Click here to download these instructions in PDF format. (1MB) read more
Tuesday, April 20th, 2010
Yamaha Raptor 250 Dyno Run This is a dyno test run by our team out of Idaho. This was a shootout of the top ATV Exhausts in the industry. HMF's full ATV Competition Exhaust Series for the Yamaha Raptor 250 beat out the competition in all aspects. And used less... read more
Thursday, April 1st, 2010
The guys up at Atvtorture.com tested the Honda Rancher 420 (07-08) for us. HMF Performance Series Exhaust Product Review Let’s face it guys, when you brought your quad home from the dealership you really didn’t think you were going to leave it stock did you? One of the first upgrades most of us do... read more
Tuesday, January 12th, 2010
Competition Series Insert Installation
In this video, we show you how to change out the inserts for the HMF Competition Series. This is a simple procedure that requires only an allen key. Step 1: Remove the allen screws on the Euro End Cap Step 2: Remove the current insert. (If you are going to keep the Spark Arrestor in, make sure... read more
Tuesday, June 2nd, 2009
Headpipe color & Engine tuning
This is not an accurate way to determine headpipe or exhaust gas temperature. Use this as an indicator to check the temperature by a more accurate method. Steel exhibits different oxidation and incandescent colors depending it's temperature. Below 800°F, it will have oxidation coloration. Above 800°F it will display incandescent (glowing) coloration. ... read more
Friday, March 20th, 2009
Many riders are modifying their machines for deep mud riding as the popularity of the sport increases. The first modification for most bikes are snorkels on the intake, exhaust & transmission. It is important to remember that for intake & exhaust snorkels there are usually other modifications that you must perform besides the... read more
Tuesday, March 17th, 2009
What is an HMF Optimizer? Anytime you install an aftermarket exhaust system to your machine, re-jetting (re-mapping on EFI machines) your carburetor is a necessity. The HMF Optimizer is an Electronic Fuel Injection (EFI) Controller that allows you to adjust your fuel mixture for proper performance. Using an HMF Optimizer with your HMF Exhaust... read more
Tuesday, March 17th, 2009
Install: Quiet Core & Spark Arrestor
Every HMF exhaust comes with a U.S.F.S. Spark Arrestor uninstalled. The installation process for the Spark Arrestor is the same for the Quiet Core and should only take a few minutes to complete. However, if you have an Elliptical exhaust with a Euro End Cap the installation process is slightly different. Click... read more
Tuesday, March 17th, 2009
Install: Torque Range Modifier (TRM)
The Torque Range Modifier (TRM ) is an insert that broadens the available torque range of the machine allowing for better "hook up" in certain conditions. The TRM is not a sound damping device and you should see no difference in speed and power. It cannot be used with a Quiet Core... read more
Tuesday, March 17th, 2009
Install: Quiet Core with Euro End Cap
Every HMF exhaust comes with a U.S.F.S. Spark Arrestor uninstalled. The installation process for both the Spark Arrestor and Quiet Core are the exact same. However, if you have an Elliptical exhaust with the Euro End Cap, it'll require a slightly different procedure for installation than the standard round end caps. Parts: 4... read more
Tuesday, February 10th, 2009
For complete instructions on how to repack your exhaust, click here. What's the Packing For? Packing material's main function is to dampen the exhaust pulse wave. With no packing in the exhaust, dB will increase to extremely loud levels. It's also an insulation barrier to protect the muffler shell from hot exhaust gasses and keeps... read more
Wednesday, February 4th, 2009
Fuel Injection/Carburetion Basics
A internal combustion engine needs two basic elements to operate, fuel & oxygen. The fuel can be any number of things; alcohol, nitromethane, natural gas, used fryer oil, but most important to a powersports enthusiast, gasoline. The oxygen comes from air, but can obtained from other souces like nitrous oxide, or even be an additive... read more
Sunday, December 7th, 2008
Outlander: Spring or Clamp Mount?
In 2008, Can-Am developed two different versions of the Outlander 800 and Outlander 800 MAX's. The difference between each of the models effects which exhaust you need to properly install it on your bike. One model of the Can Am Outlander 800 uses a spring to attach the exhaust to the bike. ... read more
Latest Resources
05/16 HMF Optimizer Instruction...
02/22 HMF Tech Video - Repack 1...
01/18 Mini Series
01/18 QRS Series
01/13 Swamp & Swamp XL Series
01/13 Penland Pro Series
01/13 Competition Series
01/13 Performance Series
05/03 Exhaust Repack Instructio...
05/03 Exhaust Repack Instructio...
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