GL 1500 engines for air boats

[Rick Hanson]

Hi ,
I am New member and am looking for someone that can help me with a simple wire harness
to allow me to use the GL 1500 motors in air boat's. I have been using Subaru engines, but like
the design of the Honda. I have a new engine that I purchased on ebay and installed in one of my
subframes. I did not think the wiring would be a problem, but found out I was wrong. I have purchased
every wire harness I could find on Ebay and could use if needed, but would prefer to bypass all the
stuff i don't need like the kick stand , ignition switch, angle sensor, and so on. I hope someone has
already had a project like this for a dune buggy or anything and can guide me in the right direction.
Thanks

[virgilmobile]

Well you could dump the whole harness on the engine and start one piece at a time bypassing the circuits that are not relevent to the airboat.The biggest problem is with the carb control system.It uses several off engine relays and vacuum solenoids to control fuel flow.
Probably the easiest would be to replace the carbs with a less complicated type.
The ignition system is vacuum controled and uses the gear selector switch to determine how the vacuum effects the timing.
complete schematics can be found in the manual section.
Here's the wiring that includes what is needed to fire it up.

As far as a easy,cut this wire,hook that wire...well no..It's the carbs that got you stuck on this unit.Get rid of them and just wire in the ignition module and vacuum line,short the wire for overdrive gear,Apply power where needed and go.Well kinda. Your not trying to simulate a high preformance bike engine on the boat,just get it to run.

[Rick Hanson]

Thanks for your time and the diagram. This will help and i will win this battle.

[WingAdmin]

Have a look at this thread - this guy has put a GL1500 engine in a little truck: /forum/viewt ... =16&t=9396

[robb]

I been wanting to use a GL1500 engine in my 86 Alfa Spider. It's a lot cheaper than the computers to replace.

[Rick Hanson]

Hi,
Great idea. I will post the wire diagram that I end up with in a few
weeks. My plan is to develop a kit that will have all the computerized
features without the little thing that are needed on the bike and not
for an airboat. I believe that the least expensive way to do this is
buy late model wrecked bikes, tear them down to get all the sensors
that are needed and sell the remainder on E-Bay.

[85 wingman]

I just did one for a project I built over the winter. As long as it's carb not injected it's not all that hard. You really don't use much of the harness. My control box is mounted next to the motor and I think there's only 10 or so wires in it. Trace them out in the diagram find the ones that control the spark. theres a hot wire going into the unit hook to your key switch and two ground wire's tie them together keep the harness ends from the coils and change the end on the box so the box will plug direct into the coils. Follow the diagram and it's easier than you would think. I think I spent maybe two hours on it. I took the cover off the box pulled the wires out that I didn't need made it cleaner. Mine is running great fires right up no problem. I have a five gallon bucket with the left over harness in it and it's full.
John