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Old 08-03-2021, 05:01 PM   #51
Fairtax4me
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Location: Charlottesburg Va
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Default Re: Fuel Issue...

Use alligator clips or a jumper wire attached to the DF post (the one with the small yellow wire) on the starter generator to jumper the DF post to ground. Run the engine and see if the charging voltage goes up. It should run up over 16v at full throttle.

If it does that, then its very likely you just need a new voltage regulator. Its in the electronics box, pretty easy to replace. Make sure it has a good connection to ground.
If the regulator has a poor ground, it will not work properly and can either cause high charging voltage, or no charging at all.


Governor vs rev limiter.
Governor regulates the cart speed, this is all mechanical and consists of the throttle cable from the black electrics box, to the governor arm on the trans, and then the governor cable which opens the throttle lever on the carb. The governor mechanism in the trans alters the throttle when the reaches a certain speed. The zip tie trick helps to pull harder against the governor arm to basically override the governor and make the cart go faster.

Rev limiter is the black box on the front of the motor just above the oil drain plug, next to the oil filter. The rev limiter grounds the ignition coil when a certain engine RPM is reached and kills spark for several seconds until the engine speed comes back down below the cut-off point. This fails often and kills spark entirely so the engine wont run, or runs very poorly. This is quite often just disconnected or removed, since a new rev limiter module is around $150. It's a box smaller than a credit card with two wires sticking out of it.

If the cart feels "slow" the governor is usually what needs to be adjusted. A cart with a bad rev limiter is often un-drivable.
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Old 08-04-2021, 05:20 AM   #52
rschap1
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Join Date: Oct 2009
Posts: 51
Default Re: Fuel Issue...

BIG THANKS for all that ! ! !
Printing it out and taking it to the cart when I get a chance to check these things.

Appreciate the help.
Know lots more now than I did before
:)
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Old 08-04-2021, 05:58 PM   #53
schreib69
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Location: Elk River, Mn
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Default Re: Fuel Issue...

I can't help but chime in. Read your ENTIRE thread. Suggest you listen closely to FAIRTAXME, for one.

I had the same IDENTICAL problem you have been having for the last few weeks and after reading YOUR thread found advice there(FAIRTAXME!) that solved it plus my own intution.

Here is the deal: i replaced ALL hoses connected to the gas tank fuel pump, Crankcase, and carb. I spend $15 on a NEW fuel pump from China via Amazon and received the NEXT day. That did NOT solve the problem but it pumped like crazy. Of course, I replaced the fuel filter and check the inlet tube in the tank-- again, NOT the problem.

The problem was. . . wait for it!. . . THE CARBURETOR! PULL that thing and clean it.

Here is my story to Fairtax me:

Did not get your info on the fuel pump in time and ordered what appears to be a direct Chinese replacement, cast-in arrows and all, to make it a Perfect "fake"-- if so. It appears Mikuni must have licensed them. It is TOO perfect. It worked, but did not solve the problem. Before digging into the carb I pulled off the carb feed from the pump and ran in maint. mode and it pumped just great. PROOF of no fuel supply issue.

I removed the carb, soaked in Amine-based carb cleaner, piano-wired all the jets, flushed finally with Gumout carb cleaner and all is fine now. SO. The carb was the problem all along. I found that the float pin and the float were bound up so the float could not rotate about the pin. This agrees with the symptoms: weeks ago it would just die intermittently until finally it refused to go past 200 yds. Slowly, the pin was binding up the float until if froze. Gas was fine and clean but who knows how the jamoke who owned it last kept his fuel clean. . . or NOT?!
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Old 08-05-2021, 05:29 AM   #54
rschap1
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Posts: 51
Default Re: Fuel Issue...

I have had the carb off.
Dropped float and bowl.
Did not soak but used a couple cans of aerosol cleaner through every hole, port, and passage that I could see and access.
Float seemed dry and needle and seat seemed to do their job OK.
Possible there could still be something clogged, but it did run quite a bit better for a short while after I did that.
Kind of like everything I have done.
Seems OK for a few miles, better than before whatever I do.
Few miles, couple days, few trips all is good...
then slowly degrades again until not being able to get home ...

Appreciate the tip(s).
I will keep it in mind that a more thorough carb cleaning could be needed !!
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Old 08-05-2021, 06:12 AM   #55
crash12888
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Location: Chesterfield, Va
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Default Re: Fuel Issue...

Spray on carb cleaner will not dissolve hardened or dried additive varnish, you need to get one of the gallon cans from any of the brand auto parts stores (kinda pricey at @ $30) teardown the whole carb completely apart and do at least a two hour soak.
Then rinse with water and blow out with compressed air.
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Old 08-05-2021, 06:38 AM   #56
rschap1
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Join Date: Oct 2009
Posts: 51
Default Re: Fuel Issue...

Not sure how soon I will be able to do that.
Might be a project for winter time.
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Old 08-16-2021, 05:12 AM   #57
rschap1
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Posts: 51
Default Re: Fuel Issue...

I did get to check the voltage regulator this weekend.
Looks like that needs replacing.
Grounded the post on top of the starter and put multi meter on battery posts.
Revved engine and saw nearly 18 volts.
Will start digging deeper, open the "box" for the first time, and do some shopping for that.
Thanks for the test procedure !
Then back to the carb and/or fuel system I guess.
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Old 08-22-2021, 08:43 AM   #58
rschap1
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Posts: 51
Default Re: Fuel Issue...

I am guessing that I mis read the info on the voltage regulator.
I thought it was needing to be replaced if I grounded the yellow post on the starter and saw 16+ volts.
I put a new one in yesterday and it acted the same as before, rev engine and see nearly 18 volts when wound up.
I was thinking that was telling me regulator was bad and allowing overcharging.
So I guess I replaced it even though it wasn't needed.
I did see inside the "box" for the first time.
Got to see the rev limiter and it's micro switches in there, starter relay, etc...
Noticed the "breather" hose from the top of the engine was cut off.
Looked like it was supposed to connect to intake/carb right near the rubber hose from air cleaner box.
Felt a lot of "blow by" when running.
Guessing there may be a good amount of wear and tear on this motor.
I ran new hose wondering if anything would be different since so much pressure coming out top of motor.
About the same as before.
Maybe dig into tearing carb down, cleaning, etc if time allows soon.
OR
Still thinking I better hit the neighbor or have another "professional" take a ppek.
THANKS again for everyone's help and advice.
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