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John Deere STX38 with low compression, 65psi (lawn tractor)

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John Deere STX38 with low compression, 65psi (lawn tractor) Kevin 07-04-2006
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Posted by Kevin on July 4, 2006, 3:51 pm
Before I rip this thing a part dose anybody have any thoughts on a
problem other than rings?
It's just lost power over time. Or that's what I was told....

Thanks for any help.


Posted by Jeff on July 4, 2006, 6:13 pm

Sounds like you might want check the gap on the Intake & Exhust
valves first.
Just my first thought.

Good Luck,
Jeff

Kevin wrote:
> Before I rip this thing a part dose anybody have any thoughts on a
> problem other than rings?
> It's just lost power over time. Or that's what I was told....
>
> Thanks for any help.


Posted by digitalmaster on July 4, 2006, 6:34 pm

>
> Sounds like you might want check the gap on the Intake & Exhust
> valves first.
> Just my first thought.
>
> Good Luck,
> Jeff
>
> Kevin wrote:
>> Before I rip this thing a part dose anybody have any thoughts on a
>> problem other than rings?
>> It's just lost power over time. Or that's what I was told....
>>
>> Thanks for any help.
> absolutely check the valve gap and it will not hurt to reseat the valves
> if you have to pull them.



Posted by C & E on July 5, 2006, 9:12 am

>
> Sounds like you might want check the gap on the Intake & Exhust
> valves first.
> Just my first thought.
>
> Good Luck,
> Jeff
>

Also, check for carbon buildup at the valve seats. Not likely but an easy
check.



Posted by Kevin on July 5, 2006, 10:54 am
Thanks Jeff

I got the manual on line last night, should have done that before I
posted the question.
turns out normal range is between 80 and 50psi. Maybe the rings and
valves are Ok.
The air filter was a mess, looks as if it hadn't been changed or
looked at for a long time. It was covered with moths, leaves and other
muck. Maybe it wasn't getting enough air? Maybe I'll rebuild the carb,
if it's anything like the filters it'll need it.

Kevin


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