2011 vt750 rpm - Honda Shadow Forums : Shadow Motorcycle Forum
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post #1 of 14 (permalink) Old 04-28-2016, 11:07 PM Thread Starter
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2011 vt750 rpm

When I bought my 2011 VT750, I was given a brand new Baron tach. I finally got around to installing it, but something doesn't seem right. At 100km/h or 60mph the bike is only revving at 1700rpm and at 110km/h or 70mph it is at 1900/2000. Even during the shifting cycle from 0-100 km/h it doesn't seem to go past 2500 rpm but the bike is definitely revving high at least it seems to be. Is this normal for this bike to have such low rpm?

Thanks in advance for any suggestions and input


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post #2 of 14 (permalink) Old 04-28-2016, 11:11 PM
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It sounds more like your tech is either not correctly set to the number of cylinders/ spark cycles or there may be an error in wiring all together. I'm not familiar with the 750 but my experience with tachs in and wiring would lead me to believe that

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post #3 of 14 (permalink) Old 04-28-2016, 11:12 PM
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I don't know the particulars about your year and model but if it is a tach for a dual fire ignition system and yours is a single fire system it will read 1/2 the RPM. That's what it sounds like. Maybe one of the guys that have added a tach to a similar bike can help explain.

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post #4 of 14 (permalink) Old 04-28-2016, 11:48 PM
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Quote:
Originally Posted by swifty2014 View Post
I don't know the particulars about your year and model but if it is a tach for a dual fire ignition system and yours is a single fire system it will read 1/2 the RPM. That's what it sounds like. Maybe one of the guys that have added a tach to a similar bike can help explain.
Exactly what he said. That's what I was getting at, however you articulated that much better than I could of.

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post #5 of 14 (permalink) Old 04-28-2016, 11:49 PM Thread Starter
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The tach comes with a module. It says if it is a dual fire the module is not required. I contacted the dealer just to verify and they told me if it has two spark plugs per cylinder it is dual fire and one plug is single fire. I knew this to be the case, but this is the first fuel injected and I wanted to make sure. Anyways, mine is dual fire so I did not install the module.

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post #6 of 14 (permalink) Old 04-29-2016, 01:44 PM
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Isn't a 2011 fuel injected? Do a little research and I think you will find that when adapting a tach to a fuel injected V twin that you will need a tach adaptor to read the correct RPM. WWW.CruiserCustomizing has a video showing their tachs and explains about the need for the tach adaptor on some V twins.

Last edited by nraluke; 04-29-2016 at 02:15 PM.
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post #7 of 14 (permalink) Old 04-29-2016, 09:37 PM
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Quote:
Originally Posted by nraluke View Post
Isn't a 2011 fuel injected? Do a little research and I think you will find that when adapting a tach to a fuel injected V twin that you will need a tach adaptor to read the correct RPM. WWW.CruiserCustomizing has a video showing their tachs and explains about the need for the tach adaptor on some V twins.
Baron also makes one - http://www.baronscustom.com/catalog/display/243/

From the install instructions

TACH ADAPTER
Q: How do I know if I need the Tach Adapter (BA-7315-50)
A. In most cases if your bike has a fuel-injected or single-fire ignition you will need the Tach Adapter.
Q. I installed the Tach and it seems to be registering half the RPM's, whats wrong?
A. You most likely need the Adapter.

Also, I do not see a PN for the adapter that comes with the tach, only BA-7315-50 sold separately. If this is the same module, great. If not, sounds like you're going to need one.



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Last edited by jwinker; 04-29-2016 at 09:43 PM.
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post #8 of 14 (permalink) Old 04-30-2016, 05:27 PM
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My 2012 Aero 750 turns 3950 RPM's at 70 MPH.You need to install the tach adapter along with the tachometer.

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post #9 of 14 (permalink) Old 05-05-2016, 10:42 PM Thread Starter
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Thanks for the info guys, I will install the tach adapter and see how that works.

Life is better outdoors!!

2011 Honda Shadow VT750 Aero
1984 Honda Shadow VT750C
2006 Pontiac Grand Prix
2007 GMC Sierra 2500HD Diesel
1998 Travelaire 5th Wheel
1984 Deltacraft 60HP Fishing Boat
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post #10 of 14 (permalink) Old 08-09-2016, 01:38 PM Thread Starter
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ok, got the tach adapter installed as per instructions. Now I get quite the needle jump pretty much constantly except in 5th gear at 100km/h I am at 3000rpm and needle is steady. Anytime else a 300-500rpm needle jump.

All connections are crimped, soldered and heat shrinked. The spade terminals at coils have plastic removed where crimped, soldered then heat shrink pushed up against spade shield to cover solder.

Ground wire direct to battery so should be grounded good.

Why would it have a needle jump and more so such a drastic one. Without tach adapter and only registering half rpm it had no needle jump.


Life is better outdoors!!

2011 Honda Shadow VT750 Aero
1984 Honda Shadow VT750C
2006 Pontiac Grand Prix
2007 GMC Sierra 2500HD Diesel
1998 Travelaire 5th Wheel
1984 Deltacraft 60HP Fishing Boat
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