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Old 03-03-2016, 08:16 PM   #1
crvaughn
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Join Date: May 2014
Posts: 27
Default Governor/throttle question

Hello, I'm in the middle of a restoration on a 75 D model. I've stripped and painted the frame, completely rebuilt motor including crank, it's basically all new. It's taken me a long time, had it a couple years but time gets away from a guy.......anyway, I think I'm missing the governor cable?? Also I don't know how to hook up the throttle/choke cables to the carb?? When I got the cart it was basically tore apart already, and it was missing parts so I've never really seen this put together correctly and the pictures in my manual are terrible. If anyone could explain it to me/put pictures close up of the governor/carb connections it would be much appreciated.

PS I'll try and get some pics up soon so you can see the progress. Motor spins over but hasn't quit run yet!
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Old 03-04-2016, 09:46 AM   #2
73eldo
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Harley Davidson
 
Join Date: Jul 2014
Location: St. Paul Minneapolis MN USA
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Default Re: Governor/throttle question

The throttle lever is spring loaded to go to full open unless something is acting upon it to close. The pedal and gov cables are not firmly attached so either one can close it. Foot off the pedal the pedal one pulls it closed. Foot on the pedal it allows it to spring open. Clutch closes in gov pulls on cable pulls throttle closed a little. Take your foot off the pedal pulls it closed all the way.
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Old 03-04-2016, 01:47 PM   #3
crvaughn
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Default Re: Governor/throttle question

So the throttle is open when the pedal is not depressed? There are two butterflies on the carb, the one furthest away the engine is the choke correct? Closer on the throttle? how does the governor attach to the clutch? I don't have a picture or have I ever seen it installed correctly? For that matter I don't eve have the cable.........
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Old 03-04-2016, 10:38 PM   #4
backyard
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Default Re: Governor/throttle question

Lets say the carb is off the cart in your hand with no cable attached. The spring on the throttle shaft keeps the butterly open, not closed like one normally sees.

Ok now when the carb is on the cart, the spring on the gas pedal is what closes the throttle shaft when your foot is off the pedal so there is an adjustmant made to where that happens. Usually by loosening the cable hold down bolt and moving the cable to that position and the tighten the hold down bolt.

When you press the gas pedal the cable lets the pressure off the throttle spring and the butterly springs open. The throttle cable may travel 1/2" or so past where the throttle shaft is wide open. Basically what this means is your throttle is wide open before your gas pedal gets to the floor.

On my model the governor rides on the backside of the primary clutch cover. Basically when the clutch moves in or out, it moves the cable in and out. The governor cable is also connected to the carb throttle shaft which governs the carb by moving the throttle shaft back towards the closed position or allowing the throttle shaft to spring back open for more rpm. I assume the spring on the throttle shaft keeps cable pressure on the back side of the clutch cover. I've never had my governor hooked up.

The choke should be the first butterly that the air hits when entering the carb. The throttle should be in the middle near the venturi (narrowed section).
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Old 03-04-2016, 11:11 PM   #5
crvaughn
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Default Re: Governor/throttle question

Thanks for the info, I'm starting to get the idea in my head. I think you hit my next question, so I don't even need to have the governor hooked up? Or will I ruin my motor if I'm constantly overevving it? Thanks again for the help....
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Old 03-04-2016, 11:15 PM   #6
73eldo
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Harley Davidson
 
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Default Re: Governor/throttle question

As long as you keep in mind that these engines were not designed to go full on for extended periods you can skip the gov.

If others especially kids were going to drive I would put it back especially if its a 3 wheeler. Its actually hard to actually flip one but they are real easy to get one wheel off the ground at which point panic often sets in and that is when people and things get hurt.
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Old 03-05-2016, 12:03 AM   #7
backyard
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Default Re: Governor/throttle question

Yea they will run hotter with more rpm and you can expect more wear, but short bursts of speed should be fine.

When I rebuilt my engine, I bent a wire (think I used a metal clothes hanger) and hooked it to the throttle connection to where the carb would only open about 70% but would still close without obstruction so that would force other riders to take it a little easier. If I wanted full power I could raise the body and remove the wire pretty quickly. The wire fell off somewhere so I just left it off. This did limit the carts get up and go and you could still get past governed speed down a hill but it took a tad longer. That is another option if you have kids.

I've searched for rpm gauges for these things awhile back, but couldn't find anything but a digital gauge that didn't really have good reviews. That would be a neat feature to have.

My 3 wheeler with a tiller handle has slow steering at low speeds, but at high speeds it becomes sensitive and a little wobbly so yes they can definately be dangerous at higher speeds.
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Old 03-05-2016, 02:13 PM   #8
crvaughn
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Default Re: Governor/throttle question

Yeah, I would like the governor I guess, I'd have to figure out where to get the parts though. I'd like to be able to run at full speed for extended periods without worry, plus I will have kids/wife occasionally driving it. One other question, I can't seem to get suction from the carb to pull gas in, just put on a new see through fuel filter and it wont fill up. Anyone have any suggestions tips in that area?
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Old 03-05-2016, 02:30 PM   #9
backyard
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Default Re: Governor/throttle question

There is a strainer/check valve in the fuel tank that may be clogged up. Pull the fuel line off the carb and blow and suck on the line to see if the line is clear. Have a cup of water nearby, ha. Also do you see any fuel leaks? Air entering the line can cause a fuel supply problem.
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Old 03-05-2016, 02:33 PM   #10
backyard
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Default Re: Governor/throttle question

Actually if you blow on the line the check valve will close and you wont be able to blow on it if it's functioning properly. You should be able to suck fuel out of the fuel tank though.
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