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Go-Kart engine problems (Briggs and Stratton) Gary H 07-07-2006
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Posted by Gary H on July 7, 2006, 9:45 pm
My neighbor gave me his old go-kart and I fixed it up. The engine is giving
me problems, though. It is a typical 5HP Briggs engine. It had been rained
on with no air filter so I tore it down and cleaned it out and put it back
together with new gaskets. I think they might have run it bone dry of oil
because there was no oil in the crankcase but the cylinder and rings looked
ok to me. So did the valves. It turns over just fine. The carb was very
cruddy and I soaked it in carb dip and put it back together with new gaskets
and diaphram.

After I got it all back together I started it up and it ran decently for a
few hours. But then it started to run worse and worse. I bought a new carb
for it and installed it tonight but it obviously wasn't the problem. Even
with the new carb and with fresh gas it will only run with the choke all the
way on. The new carb doesn't have an idle adjustment screw so it seems like
it can't be a fuel problem. What else could it be? The only thing left is
spark and compression. It obviously has both of those because it runs and
had plenty of power when it was running OK which indicates compression is
probably OK. I made sure the gas cap isn't blocked.

Any ideas what I should check next? Or what I should recheck?

Thanks,
Gary




Posted by Tony Hwang on July 7, 2006, 9:48 pm
Gary H wrote:

> My neighbor gave me his old go-kart and I fixed it up. The engine is giving
> me problems, though. It is a typical 5HP Briggs engine. It had been rained
> on with no air filter so I tore it down and cleaned it out and put it back
> together with new gaskets. I think they might have run it bone dry of oil
> because there was no oil in the crankcase but the cylinder and rings looked
> ok to me. So did the valves. It turns over just fine. The carb was very
> cruddy and I soaked it in carb dip and put it back together with new gaskets
> and diaphram.
>
> After I got it all back together I started it up and it ran decently for a
> few hours. But then it started to run worse and worse. I bought a new carb
> for it and installed it tonight but it obviously wasn't the problem. Even
> with the new carb and with fresh gas it will only run with the choke all the
> way on. The new carb doesn't have an idle adjustment screw so it seems like
> it can't be a fuel problem. What else could it be? The only thing left is
> spark and compression. It obviously has both of those because it runs and
> had plenty of power when it was running OK which indicates compression is
> probably OK. I made sure the gas cap isn't blocked.
>
> Any ideas what I should check next? Or what I should recheck?
>
> Thanks,
> Gary
>
>
>
Hi,
Timing?

Posted by Gary H on July 7, 2006, 10:01 pm
>> My neighbor gave me his old go-kart and I fixed it up. The engine is
>> giving me problems, though. It is a typical 5HP Briggs engine. It had
>> been rained on with no air filter so I tore it down and cleaned it out
>> and put it back together with new gaskets. I think they might have run
>> it bone dry of oil because there was no oil in the crankcase but the
>> cylinder and rings looked ok to me. So did the valves. It turns over
>> just fine. The carb was very cruddy and I soaked it in carb dip and put
>> it back together with new gaskets and diaphram.
>>
>> After I got it all back together I started it up and it ran decently for
>> a few hours. But then it started to run worse and worse. I bought a new
>> carb for it and installed it tonight but it obviously wasn't the problem.
>> Even with the new carb and with fresh gas it will only run with the choke
>> all the way on. The new carb doesn't have an idle adjustment screw so it
>> seems like it can't be a fuel problem. What else could it be? The only
>> thing left is spark and compression. It obviously has both of those
>> because it runs and had plenty of power when it was running OK which
>> indicates compression is probably OK. I made sure the gas cap isn't
>> blocked.
>>
>> Any ideas what I should check next? Or what I should recheck?
>>
>>
> Hi,
> Timing?

I thought about timing but it has a magnet and coil so is it even possible
for the timing to be off? I'll have to investigate.



Posted by digitalmaster on July 7, 2006, 10:13 pm

>>> My neighbor gave me his old go-kart and I fixed it up. The engine is
>>> giving me problems, though. It is a typical 5HP Briggs engine. It had
>>> been rained on with no air filter so I tore it down and cleaned it out
>>> and put it back together with new gaskets. I think they might have run
>>> it bone dry of oil because there was no oil in the crankcase but the
>>> cylinder and rings looked ok to me. So did the valves. It turns over
>>> just fine. The carb was very cruddy and I soaked it in carb dip and put
>>> it back together with new gaskets and diaphram.
>>>
>>> After I got it all back together I started it up and it ran decently for
>>> a few hours. But then it started to run worse and worse. I bought a
>>> new carb for it and installed it tonight but it obviously wasn't the
>>> problem. Even with the new carb and with fresh gas it will only run with
>>> the choke all the way on. The new carb doesn't have an idle adjustment
>>> screw so it seems like it can't be a fuel problem. What else could it
>>> be? The only thing left is spark and compression. It obviously has
>>> both of those because it runs and had plenty of power when it was
>>> running OK which indicates compression is probably OK. I made sure the
>>> gas cap isn't blocked.
>>>
>>> Any ideas what I should check next? Or what I should recheck?
>>>
>>>
>> Hi,
>> Timing?
>
> I thought about timing but it has a magnet and coil so is it even possible
> for the timing to be off? I'll have to investigate.
>
timing is set by the key in the flywheel/crankshaft.If the flywheel gets
loose it can partially shear this key throwing off the timing.
Check your compression.
did you check the valve clearance when you had it down...proper valve
seating has more to do with compression than rings on these engines.



Posted by Gary H on July 7, 2006, 10:17 pm
>>>> My neighbor gave me his old go-kart and I fixed it up. The engine is
>>>> giving me problems, though. It is a typical 5HP Briggs engine. It had
>>>> been rained on with no air filter so I tore it down and cleaned it out
>>>> and put it back together with new gaskets. I think they might have run
>>>> it bone dry of oil because there was no oil in the crankcase but the
>>>> cylinder and rings looked ok to me. So did the valves. It turns over
>>>> just fine. The carb was very cruddy and I soaked it in carb dip and
>>>> put it back together with new gaskets and diaphram.
>>>>
>>>> After I got it all back together I started it up and it ran decently
>>>> for a few hours. But then it started to run worse and worse. I bought
>>>> a new carb for it and installed it tonight but it obviously wasn't the
>>>> problem. Even with the new carb and with fresh gas it will only run
>>>> with the choke all the way on. The new carb doesn't have an idle
>>>> adjustment screw so it seems like it can't be a fuel problem. What
>>>> else could it be? The only thing left is spark and compression. It
>>>> obviously has both of those because it runs and had plenty of power
>>>> when it was running OK which indicates compression is probably OK. I
>>>> made sure the gas cap isn't blocked.
>>>>
>>>> Any ideas what I should check next? Or what I should recheck?
>>>>
>>>>
>>> Hi,
>>> Timing?
>>
>> I thought about timing but it has a magnet and coil so is it even
>> possible for the timing to be off? I'll have to investigate.
>>
> timing is set by the key in the flywheel/crankshaft.If the flywheel gets
> loose it can partially shear this key throwing off the timing.
> Check your compression.
> did you check the valve clearance when you had it down...proper valve
> seating has more to do with compression than rings on these engines.
>

How do I check compression on a small engine? I have a compression gauge
for cars. Will it work? I think the timing is fine.



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