Adjustable Cam Gear
Fits 2007 - UP HD Chain Drives
Contact for availability
Price includes shipping to the US except Alaska and Hawaii. E-mail me for shipping to other areas.
I am currently not accepting orders, but I will resume after my surgery in a few weeks.
$250.00 + shipping Limited time offer: No extra dyno labor if you are purchasing and installing the cams through us.
Made in the USA
The new gears have a few changes.
The gear is now made of chrome moly and the
hub is machined from steel then hardened. The securing hardware is also hardened.
I have a lot of dyno graphs that I'll add later to
show the TQ & HP increases.
It would be an advantage to install this gear anytime that you are installing new cams. It takes about one extra hour to do the extra dyno runs and adjust the gear for the most power.
2 years in design and development. Patent Pending.
Now you can adjust your cam timing from -10 degrees to +10 degrees. With this gear you can move the torque band up or down the RPM band.
You will also be able to adjust and tune the camshaft exhaust valve closing to gain the most power with the exhaust that you are using. The three graphs below show examples of advancing and retarding the cam timing of a particular engine. The gear was the only thing that was adjusted or changed. The AFR was not adjusted, but if it was, the torque and horsepower would have a higher reading. This shows the gains that can be made by moving the cam timing around until you locate the most power for your application.
120R using an adjustable cam gear with 2.5 degrees advance.
2011 103 Ultra Limited, TW-408-44 cams, Pro Pipe, A/N Big Sucker.
"0" degree vs +3 degrees. This nike was not tuned (only had a base map installed)
with theAFR at around 10:1 2000-4500 RPM and 16:1 AFR at 5500-6000 RPM.
Look at the TQ increase at 1800-2200 RPM. Remember that the AFR hasn't been corrected.
2010 SE 110, stock cams, Pro Pipe, -2.5 degrees.
The graph was before the final AFR tune.
This is a 103 ci using a S&S cam and a Pro Pipe.
The BLUE run is with the gear at "0" degrees.
The RED run is with the gear at "-5" degrees.
After fine tuning the engine, the it had a peak TQ of 107 + TQ and 88+ HP.
This shows that there are also substantial when using the adjustable gear with negative degrees.
This is a 2010 96" stock cams, stock exhaust, stock A/C.
4 TQ gain @ 2700 RPM with out correcting the AFR.
This was to show that the adjustable cam gear can create power
increases no matter what performance modifications are added.
You usually have an increase of 10 - 15 HP when you install an exhaust and A/C with a good dyno tune. How much did you spend on the pipe and A/C to gain 15 HP?
It not uncommon to gain 8+ HP when using the $250.00 Adjustable Gear.
This is another good "Bang For Your Buck" when you compare how much you would have to spend to gain an additional 8 HP w/o using the gear.
Keep in mind that dynamometers and or dyno graphs should not be used to compare readings against each other because the dynamometer correction factor may be set different from the dyno that you are comparing. For an example: The bike in the graph has a peak TQ of 108 and may have a higher TQ reading on another dyno.
Below is a 2009 Ultra 110 CVO bike with Woods TW-7H cams and V&H Power Duals. I installed the cams and set the gear to "0". Then I performed a dyno run and followed the procedure described above. I did not tune the engine until I had the final adjustment. There is no need to tune each run. All that you are looking for is the maximum power, then you can dyno tune the engine.
I have seen a gain of 8 TQ on a 103 ci engine. Notice where the TQ begins, peaks and where the HP drops off.TQ is about 80 @ 3000 RPM...TQ peaks at 4300 RPM...HP drops off at 5500 RPM
TQ is about 84 @ 3000 RPM...TQ peaks around 4300... HP starts to drop off @ 5800 RPM
This graphs shows that +5 degrees provides the most power.
TQ is 90 @ 3000 RPM...TQ peaks at 4000 RPM...HP drops off at 6100 RPM 
This next graph shows an increase of 8 TQ
Instructions:
There is no need to adjust the AFR each time you change the timing. You are basically looking for the peak power (no matter what the AFR is) until the gear is in it's final position. Will normally find that the fuel mixture will start to lean, which means that the engine is starting to scavenge better. After you find the sweet spot, then adjust the AFR.
It takes about a hour for the extra dyno runs to find the cam timing "sweet spot" using most 2 into 1 exhaust pipes.
Install the gear the same as the factory gear using factory instructions. Set the timing gear to "0" degrees. Use a couple of timing cover bolts (easily accessed) to hold the cover on. There is no need to install every cam cover bolt because you will be removing the cover several times. Install the exhaust by securing the exhaust to the cylinder heads (to keep from leaking), secure the rest of the exhaust loosely because you will be loosing it to remove the cam cover a few times. Perform one dyno run and record your findings for comparison later. Only adjust the AFR if the mixture is dangerously lean.
Loosen the exhaust and remove the timing cover. The gear is easily adjusted by loosing the gears four screws, turning the crank bolt until the desired cam timing shows up in the window of the the cam gear. We suggest that you move the timing to "+2.5", then just tighten the the lock nuts. Loosely secure the exhaust again and make your second run. If there is an increase in power, repeat the procedure and adjust the gear another +"2.5" (+5 degrees). Keep doing this procedure until the TQ and HP start to drop, then fine tune the gear by moving the gear back a degree until you find the best power.
If you performed the first step at "+2" and the power decreased, perform the procedure described above except using negative degrees.
Note: Most increase will occur in positive degrees (+). I have seen large power increases with as little as +2 degrees and as much as +7 degrees with normal street cams. All engine will be different.
We do offer a price break to other retailers with a minimum of four gears on their first order. Retailers must provide proof of: valid Tax ID number, have a retail motorcycle store / dealership / repair shop with valid business location and proof of advertising.
Contact me at: clark@hemrickperformance.com
Please read the "Exhaust" article to help understand
the theory of exhaust waves and the importance of valve timing.
Exhaust Article LinkNo matter what exhaust and camshafts that you are using, they are
not timed exactly to produce the maximum power.