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18.5 hp B&S starts but no high rpms

#1

T

T&D

Put new cam in and checked Governor for wear looks fine. Put every thing back to gather it starts but has no high rpms at all. Put new carb on adjusted Governor several times and replaced fuel lines and filter. Not sure what else may be causing the problem. Anyone have any idea's. John Deere zero turn EZtrack


#2

StarTech

StarTech

Check that the governor spring is in place.


#3

T

T&D

Checked spring and its in the right place


#4

T

T&D

Is there anyway to test the governor to make sure it is working.


#5

B

bertsmobile1

Watch it.
At rest the arm should be holding the throttle butterfly fully open
As the engine increases speed it should close the throttle to maintian a constant speed
When you turn the engine off , as the engine starts to slow down you should see the arm opening the butterfly again.

If it closes instead of opens then you have it set backwards.


#6

T

T&D

Thanks, will check that out. Running out of idea's on what is wrong. Have tried about everything I know of to do.
Terry


#7

T

T&D

bertsmobile1 said:
Watch it.
At rest the arm should be holding the throttle butterfly fully open
As the engine increases speed it should close the throttle to maintian a constant speed
When you turn the engine off , as the engine starts to slow down you should see the arm opening the butterfly again.

If it closes instead of opens then you have it set backwards.
Click to expand...
Checked butterfly it’s fully open at rest. So any ideas as to why I have just low idle can’t get it to go full throttle it dies
Terry


#8

B

bertsmobile1

OK so the governor is working.
Starting to think you may have the cam timed wrong.
I put a run of masking tape around the flywheel and mark TDC using the side of the coil , then rotate the engine marking the opening & closing points of each valve.
This saves me splitting a case that did not need to be done to check the cam
Alos double check the flywheel key has not broken & the engine is electrically out of time.


#9

T

T&D

Ok, thanks for your info will check both things. I have never run into this problem before. Will let you know how it turns out.
Terry


#10

T

T&D

bertsmobile1 said:
OK so the governor is working.
Starting to think you may have the cam timed wrong.
I put a run of masking tape around the flywheel and mark TDC using the side of the coil , then rotate the engine marking the opening & closing points of each valve.
This saves me splitting a case that did not need to be done to check the cam
Alos double check the flywheel key has not broken & the engine is electrically out of time.
Click to expand...
Ok checked key not broken. Engine is TDC. Rechecked cam both dots line up. Tried manual moving linkage into full throttle didn't do anything. Could governor be not working properly? Not sure what is going on. I've checked everything I can think of. Stumped


#11

S

slomo

Can you manipulate the throttle linkage and make it run faster with your fingers? Check for bent linkage and gov maladjusted.

slomo


#12

B

bertsmobile1

If it is still apart then take a shot of the governor mechanism
Some of them can pop apart but apart from that I can not think of anything else right now


#13

StarTech

StarTech

Governor as it is closing the throttle vane. Throttle linkage is connect to the governor spring and increases the tension on the governor for faster rpms. It sounds like you have the throttle not connected properly; therefore it is increase tension on the governor spring.or you even the linkage connected wrong.


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