Engine speed rhythmically up and down

[percival]

Hi: 2007 Club car only starts by folloring
gas pedal and stalls without keeping the gas
pedal down. While it runs the speed goes up
and then down with a regular rhythm. I can
see what I assume is the accelarator cable
moving back and forth to the beat of the
engine speed where it enters an apparatus
near the top on the engine but the gas pedal
is stationary.

Thanks

[shoelessjoe]

I'm assuming you are either in maintenance mode or you have the rear wheels off the ground since you are standing there watching the linkage move.

When you floor it in either maintenance mode or with the tires off the ground the cart, since it has no resistance against it, will build RPM's and tire speed quickly and the govenor will kick in. When the govenor kicks in the speed will decrease for moment and then (since you are still holding it floored) it will quickly build back up and again hit the govenor and slow back down. That cycle will repeat as long as you hold the pedal down.

The linkages you are watching move are likely the throttle cables to and from the govenor assembly as well as the govenor assembly itself. The govenor is designed to reduce the throttle input received at the motor regardless of what is going on at the pedal so the cart will slow down. It does that via a linkage and spring which are mounted on the transaxle in the rear of the cart.

The throttle cable doesn't go straight from the pedal to the carb as it would on car. It instead goes to the govenor set up before going to the motor. Becuase of the way the govenor is designed it can increase or decrease the throttle level the motor receives regardless of the fact that you have the pedal to the floor.

[TwistEdFish]

How do you change between Maintenance and normal run modes?

My Newly acquired used Gas Club car is doing exactly this and I was told by the previous owner that the car had been recently and fully serviced. It starts easy runs well just seems very slow and rhythmic at the top end with speed maxing out then slowing and again maxing out.

Could the service tech have left it in maintenance mode?

[DOOmsman]

Ed the cart is moving so its not in maint mode, and welcome.

[DOOmsman]

Perc, your problem with having to floor it may be the inlet needle in the carb may be sticking and allowing to much gas, therefore you have to floor it.

[percival]

Thank you shoelessjoe and DOOmsman:

Looks like a sticky inlet needle might be the
cause of having to floor the pedal to start
the cart and keep it going which then kicks
the govenor in resulting in the engine speed
going up and down.
Looking at the schematic of the fuel system
for new models up to 2005 the carb looks like
the one in my 2007 with the needle accessible
in the bowl at the bottom of the carb. I hesitate
to take the carb apart. Looks like a O-ring at
the seat of the bowl which will crumble when I
try to take the bowl off which I'm not sure I can
do without removing the whole carb from the
engine with gaskets breaking and microscopic
parts falling out etc.. Is there a repair kit? The
cart spent the winter here in NY in a heated
garage without any storage steps being carried
out. Thanks again