Equipment: Tecumseh OHH60-71106C in Murray Go-Kart. Two pedals: accelerator,
brake. Manual start (must pull cord).
Problem: When try to start engine, Go-Kart wants to lurch forward. In
essence, Go-Kart will not idle. Wants to start directly into run mode.
Description: Go-Kart 5 years old. Well maintained and in good condition.
Rode well for 5 minutes yesterday. Cut off engine to take a break. When try
to restart, go-kart lurches forward and will not start. It appeared to me
that the engine was trying to start directly in run mode (not idling). I
propped up the frame to get the rear wheels off the ground and tried
starting engine again. Starts fine but wheels are moving at medium speed.
Checked the accelerator and it is not stuck and appears to be operating
fine. Tried carburetor adjustment ... no dice. Removed Torque Converter
Clutch. It looks OK, but I'm not a mechanic. Torque Converter Belt also
appears to be in very good condition.
Question 1: Started engine without Torque Converter Clutch attached. Noted
that the engine shaft is turning upon start. Should that be happening? (My
naive common sense tells me that idle means idle. When engine started and
not depressing accelerator, then shaft should not turn?).
Question 2: Given description of the problem, anyone with small engine
experience want to opine as to whether the difficulty is with the engine ...
or with the Torque Converter?
Thanks for the assistance.
You misunderstand. The only difference between "run" and "idle", as far as the
engine is concerned, is how fast it's running.
Yep. That's the way they work. Just like your car. Ever look under the hood of
your car with the engine running, and the transmission in park? Stuff's
moving. That's what an idling engine looks like.
Nope. If the engine is running, the shaft is turning. "Idle" is simply the
speed at which the engine runs when the accelerator is not depressed. Think
about it: do you have to turn the key in your car when you want to pull away
from a stoplight? No. The engine is already running, idling.
There's nothing the matter with the engine -- you pull the cord, it starts;
you step on the gas, it speeds up; you let off the gas, it slows down. That's
how it's supposed to work.
You don't have a torque converter, you have a centrifugal clutch -- which is
supposed to engage only at high engine speed, not when the engine is idling.
The clutch is stuck in the engaged position. Replace the clutch.
Doug Miller (alphageek-at-milmac-dot-com)
real simple problem. does the engine idle??? when the chain or belt from
the clutch is removed or disconnected???? just go for the engine
first... if it idles then your problem is farther up... like the
clutch... the clutch might be grabbing before it it suppose to grab..
and this will make the wheels spin(liek when you had the rear wheels
lifted... and yes the engine shaft should always turn when the motor is
running... but at a slower speed(like Idle) and when you race it by
giving it gas the clutch engages and then power goes to the wheels....
Or do you just have the Idle up to high????? this would make the engine
race and then set the clutch into motion.....
hope this helps.
WOW. Thanks for all the Great Feedback.
1. It is a Torque Converter and not a Centrifugal Clutch.
2. When removed the Torque Converter Driver and started engine, I see that
crankshaft is still turning. And RPMs move in relation to force on the
accelerator. So problem must NOT be the engine.
3. I believe the problem is the Torque Converter Driver. It's stuck in
engage mode and always driving the belt.
4. Going to pull the Torque Converter Driver apart and lubricate the weight
assembly and hub.
5. The springs of the weight assembly are not broken.
But heck, I'm no mechanic. I wouldn't know if a Torque Converter Driver
was broken unless it grabbed me by the ears and told me so.
If that doesn't work ... not sure where to look next.
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