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Mf 10 Engine Surge


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#1 DanP OFFLINE  

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Posted August 19, 2013 - 08:59 AM

I have a MF 10 that has a bad engine surge when it idles. I have taken the carb apart many times and cleaned it to a point I don't think it can be cleaned any more. It was not that bad to begin with. I have put a new service nozzle in so I know that is not the problem.

The one thing I have not done is made any adjustments to the govenor. I have read the manual on that but have not tried adjusting it yet.

Any ideas?

Anybody ever try to adapt another brand carb on a TECH?


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#2 HDWildBill OFFLINE  

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Posted August 19, 2013 - 09:23 AM

Have you checked for any air leaks around the manifold?


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#3 DanP OFFLINE  

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Posted August 19, 2013 - 09:33 AM

Yes all new gaskets, I have not done the penetrating oil test yet but I do not see any defects.


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#4 motobreeder OFFLINE  

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Posted August 19, 2013 - 09:54 AM

Is it just idling up and down - will it idle if you hold the throttle against the idle stop?

Or does it cut out and surge back to life when the governor opens the throttle?

 

I'm struggling with a few Tecumseh motors that won't idle.  They won't run on the idle circuit.

 

Trying to figure that out, I read online that the bowl nut has a small hole that needs to line up with a notch on the tube.  If the gasket is compressed too much, this might be a problem.  I haven't had a chance to test this theory.


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#5 EricFromPa ONLINE  

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Posted August 19, 2013 - 10:22 AM

My HH100 would not Idle without surging.Mine has an LME carb.There are 2 very small holes (Primary And Secondary Idle discharge) that need to be cleaned out or it won't idle.

This is some good info on carb rebuilding and adjustment.

 

http://pwp.bellsouth.../carbmanual.pdf

 

These guys do awesome carb restorations if anyone is interested.

http://www.carbrescu...m/workpics.html


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#6 TerryD OFFLINE  

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Posted August 19, 2013 - 10:44 AM

While the carb is off, you might as well check valve clearances. My exhaust is .005" over and my intake is .008 under. I'm working on getting that fixed while the carb is out for rebuild. Those LME carbs are a finicky.
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#7 New.Canadian.DB.Owner OFFLINE  

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Posted August 19, 2013 - 11:41 AM

I did two videos of my Tecumseh 12.5 hp that had issues with 1) the governor system and 2) the throttle shaft.  They may help.  


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#8 DanP OFFLINE  

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Posted August 19, 2013 - 03:57 PM

I watched the videos and that is not what mine is doing. It just starts to die and then surges and it might do this once every 10 -20 seconds or so not real fast like the bushing wear as in your video.


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#9 MH81 ONLINE  

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Posted August 19, 2013 - 04:14 PM

Can you get a video of it and put it on youtube or something?

#10 Luke OFFLINE  

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Posted August 19, 2013 - 06:16 PM

Sounds like your throttle shaft/bushing is worn and its sucking air!? I have one with the same surging problem but don't use it enough to bother to figure out the problem to fix it. Mine has a worn out shaft/bushing. Luke

#11 IamSherwood OFFLINE  

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Posted August 19, 2013 - 07:38 PM

Have you checked the float setting?

Very finicky......



#12 DanP OFFLINE  

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Posted August 19, 2013 - 10:40 PM

Yes I have checked and rechecked the float. I have the new plastic float and there is no tab to bend so I have filed the float valve to get the right distance. This was a new motor that has been sitting in a box for 20 years. Nothing is worn on it.

#13 DanP OFFLINE  

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Posted August 20, 2013 - 07:57 PM

I cleaned both low idle ports out and no luck. I took a video of it and if I can figure out how to post it I will.



#14 DH1 ONLINE  

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Posted August 20, 2013 - 08:11 PM

Does it do it with the choke partly closed?



#15 DH1 ONLINE  

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Posted August 20, 2013 - 08:26 PM

 

This is some good info on carb rebuilding and adjustment.

 

http://pwp.bellsouth.../carbmanual.pdf

 

 

 

I notice in this manual the carbs they show have a throttle return spring, does yours have this?






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