Finishing Up

The only remaining VOES related step, is to attach the vacuum hose that you installed on the carb or manifold during an earlier step. To do this, slide a hose-clamp onto the hose, work the hose onto the nipple of the VOES, and then secure the clamp. See photo below. Note: The hose-clamp is actually optional.

Now just reinstall the gas tank, reconnect the battery, and put the seat back on. That's all there is to it.

The following are unlikely, but they are possible problems this installation might present:

• An air leak in the vacuum hose
• An air leak at the vacuum fittings
• An electrical short.

Check your connections carefully, if you suspect problems.

Start her up and enjoy greater low/mid range power and better gas mileage, as well as full high-RPM power.

Author's Notes

Instead of a VOES, a few riders have installed a MAP (Manifold Air Pressure) sensor, while a few others have adapted the stock TPS to the HSR carburetor.

MAP Sensors: I, personally, have no experience with MAP units. However, as I understand, MAP units supply variable voltage to the ignition system, based on intake vacuum. Sounds good. The difficulty though, is that no MAP unit has been found that will offer voltage outputs on a similar power curve to the stock TPS. Also, there's the issue of the erratic intake vacuum inherent in V-twin engines.

TPS Adapting: Since TPS-adapting requires machining on the carb, not many owners have been willing to take such drastic measures.

A Delphi Road Star Riders forum member (Ken "The Mucker" Sexton), on the East Coast has begun offering a TPS adaptation service. According to The Mucker: Just ship him your HSR carb and the TPS adapter from your stock carb. He will perform his magic, and return your carb with the TPS installed and properly calibrated. The cost of this adaptation--as of this writing--is $100 plus one-way shipping. You can post a message to him on that forum, for further information.

As of this writing, I have found no performance data for these options. In addition, removing the TPS from your stock carb may reduce its resale value, if you decide to sell it.

Unfortunately, I must leave it to the reader to perform a cost/benefit analysis on the real value of VOES vs MAP vs TPS-adaptation. I made my choice…now it’s your turn.

Ride on.

Questions should be asked in our forum (Use discuss link below). The forum is very active and you stand a good chance of getting your questions answered there. If you would like to leave feedback for the author, or have additional information you think will benefit others, please use the comment section at the bottom of this page.

Discuss this article on the forums. (29 posts)

DISCLAIMER: This information and procedure is provided as a courtesy and is for informational purposes only.  Neither the publishers nor the authors accept any responsibility for the accuracy, applicability, or suitability of this procedure.  You assume all risks associated with the use of this information.  NEITHER THE PUBLISHERs NOR THE AUTHORs SHALL IN ANY EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, PUNITIVE, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, OF ANY NATURE ARISING OUT OF OR IN ANY WAY CONNECTED WITH THE USE OR MISUSE OF THIS INFORMATION OR LACK OF INFORMATION.  Any type of modification or service work on your motorcycle should always be performed by a professional mechanic. If performed incorrectly, this procedure may endanger the safety of you and others on your motorcycle and possibly invalidate your manufacturer’s warranty.

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