900 jake brake possible - Kawasaki Vulcan Forum : Vulcan Forums
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post #1 of 16 (permalink) Old 06-04-2013, 02:55 PM Thread Starter
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900 jake brake possible

So on a charity ride this weekend I heard a Harley that had a jake brake kit installed on it. I never got a chance to ask how he did it. I do know that it was a newer fuel injected Harley. Does anyone know if it can be done or how to put a jake brake on a 900 vulcan. I have a powerpro auto tuner. Anyway I could put a switch to the ground to shut off the injectors or would this harm the tuner?

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post #2 of 16 (permalink) Old 06-04-2013, 04:06 PM
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Seems to me (if there is such a thing, never seen one) that it is just a do-dad that will mess up on your and cause more headache than what it is worth. Motorcycles hold back so well anyway why add something to it.

IMHO it sounds pointless to me.

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post #3 of 16 (permalink) Old 06-04-2013, 04:46 PM
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Seems all it would take is a relay wired into the fuel pump circuit to cut power by a switch on the handle bars. Perhaps one that is spring loaded that you have to hold in to cut power. Should work on any FI vehicle. Would need a normally closed relay that opens when power is applied by the switch.
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post #4 of 16 (permalink) Old 06-04-2013, 04:54 PM
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I would be concerned about rear wheel lock up.

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post #5 of 16 (permalink) Old 06-04-2013, 05:39 PM
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Why not just hit the kill switch?

I'm not sure why you'd want to though. A jake brake OR use the kill switch. There's PLENTY of decelerating power on these 900's, you could probably lock the rear up just by downshifting and dropping the clutch! The REASON for a jake brake is that 18-wheelers are heavy and their diesel engines don't provide much engine braking. (And riding the brakes can cause the brakes to overheat or catch fire!) We have neither of those problems, our bikes are light, and the engines brake excellently.

So; guess I'm confused but, why?

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post #6 of 16 (permalink) Old 06-04-2013, 08:22 PM Thread Starter
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Thanks for the responses. I'm not looking at doing it for more braking power, I agree the 9s have plenty of engine brake. It turned a lot of heads and I was more interested in it for the uniqueness not as a daily use. I think a to shut down the injectors is the way to go, does anyone know where I could source a wiring diagram?

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post #7 of 16 (permalink) Old 06-04-2013, 08:28 PM
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My Clymer manual for my 800 has the wiring diagrams in the very back. If you plan to do any of your own maitenance, highly suggest you get a manual. Am sure they all have wiring diagrams.
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post #8 of 16 (permalink) Old 06-04-2013, 11:15 PM
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Originally Posted by Grizz View Post
I think a to shut down the injectors is the way to go, does anyone know where I could source a wiring diagram?
Doing something like that would certainly turn on the FI light and set a code!
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post #9 of 16 (permalink) Old 06-05-2013, 03:28 AM
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A truckers opinion, I think someone is pulling your leg. No company is going to go through the trouble of creating an engine brake for a bike.

Jake brake is a name brand but the general term is engine brake. It works by closing off the valves during deceleration to provide more back pressure. So we're talking about extra springs and mechanical connections and relays to turn them on an off, and connections to the throttle, clutch and brake to ensure it only comes on when desired. They are useless at low rpms and only become really effective at 1700 rpm and up on a 6 cylinder diesel engine. Oh and they usually have multiple position selectors so you can choose to operate only 2,4 or all 6 cylinders or sometimes just 3 or 6.

I'm guessing what you heard on the HD was some kind of exhaust sound that isn't normal and the guy had some fun with you saying he had a jake brake. Ask him to pop the valve covers off so you can take pictures and compare them to factory valves, it should look very different from factory with the extra stuff on them.
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post #10 of 16 (permalink) Old 06-05-2013, 06:47 AM
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