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Offline jmester

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rough idle.
« on: November 13, 2013, 05:59:23 pm »
Could a saw that has a rough idle. By rough idle I mean it is all over the place sometimes to fast and some times it will shut off. Be caused by a leaking crank seal, or maybe to big of a jet in the carb. It revs fine and has a steady top rpm.
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Offline Cut4fun .

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Re: rough idle.
« Reply #1 on: November 13, 2013, 06:05:00 pm »
I've had it be crank seals on this. Also had **** split intake boot do this too.
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Offline 660magnum

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Re: rough idle.
« Reply #2 on: November 13, 2013, 06:05:28 pm »
For me, a new carb metering valve diaphragm fixed this
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Offline jmester

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Re: rough idle.
« Reply #3 on: November 13, 2013, 06:08:55 pm »
It has a new carb and also the intake manifold is new as well. I will do a vaccum test and see what is going on with it.
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Offline kr5258

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Re: rough idle.
« Reply #4 on: November 15, 2013, 06:09:59 pm »
Quote from: Cut4fun_ on November 13, 2013, 06:05:00 pm
I've had it be crank seals on this. Also had **** split intake boot do this too.
Surging idle is the usual symptom of an air leak. Top handle saws are prone to intake boot leaks.

Did you find a problem during the Vac/Pressure test?
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Offline jmester

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Re: rough idle.
« Reply #5 on: November 15, 2013, 08:02:21 pm »
No it held tight during both test plus rolled the crank as well. think my jetting was to big had a tillotson HS 320 on there it had a .71 main jet , I put on a walbro wj 67 with .66 main jet and will try it out.
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Offline Cut4fun

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Re: rough idle.
« Reply #6 on: November 15, 2013, 08:19:21 pm »
Quote from: kr5258 on November 15, 2013, 06:09:59 pm
Quote from: Cut4fun_ on November 13, 2013, 06:05:00 pm
I've had it be crank seals on this. Also had **** split intake boot do this too.
Surging idle is the usual symptom of an air leak. Top handle saws are prone to intake boot leaks.

Did you find a problem during the Vac/Pressure test?

Nope, I just Redneck it.    ;) :D
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