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Post by juggaloassassin183 on Jul 9, 2009 16:56:38 GMT -5
hello im trying to help my dad figer out why his old c-71 wont start his dad got it used when my dad was 12 or 13 aroun 63, 64and has been cutting wood with it up untioo a few years ago we brought it back out today to find it wont start unless u spray ether or gas on the intake of the carb it gets spack and fule comes through the main line any ideas
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Post by MCS on Jul 9, 2009 18:11:24 GMT -5
If it sputters with a prime as you say and there is some fuel coming through the fuel line, then its time to open the carburetor. Could be a simple thing like a stuck needle valve or water in the fuel. You should be able to pull the carb and remove the bottom plates and inspect the screen, needle valve and diaphragms. I think it has an HL carb on it.
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Post by juggaloassassin183 on Jul 9, 2009 22:29:36 GMT -5
its not eather of thoughs it has fresh gas my dad took the carb apart and cleaned to witch there was no change and he can testify that the magnito is puting out with a num hand
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Post by billg on Jul 10, 2009 3:14:06 GMT -5
Well a engine needs spark fuel and air. It sounds simple but if you determine what you are missing or in the wrong balance then you have it.
Bill
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Post by MCS on Jul 10, 2009 8:15:17 GMT -5
The reed valves could be a possible problem. A reed that doesn't seal or is broken will prevent the crankcase from making a pulse to run the fuel pump.
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Post by lesorubcheek on Jul 10, 2009 12:01:56 GMT -5
That's a great point A7. Wish I could offer another suggestion, but you've covered everything I would guess. About the only other thing I could think would be to verify for sure no fuel is being pumped to the carb. To do this, you can run a clear fuel line from a fuel source (can or bottle) to the carb, take out the spark plug to make the engine turn easier. Crank her over and watch if fuel is being pulled in or not.
Dan
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Post by juggaloassassin183 on Jul 11, 2009 18:07:16 GMT -5
im still new tothis so can you tell ma how th check the reed valve i really want to get this one runing my dad says it was a really beast
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Post by MCS on Jul 11, 2009 21:32:27 GMT -5
I have read back through the thread and this is what is known: - The ignition is working because it runs briefly when primed.
- Engine compression is adequate - it does run briefly.
- There is a fuel delivery problem of some sort. This means everything in getting the fuel air mixture from the carburetor to the top of the cylinder, but since it does run when primed, the symptoms are pointing to the carburetor or fuel line and filter.
A very common problem is the filter inside that tank, on the end of the flexible fuel line, is plugged up or the fuel line itself is soft an mushy. You said it has fuel flow. How did you verify this 
The fuel pump isn't real strong so any blockage or restriction will have an effect. The reed valve is on the underside of the elbow that the carburetor is connected to. When you take the carburetor off, look for the small hole in the manifold. This is the passage connecting the carburetor fuel pump to the crankcase. As the piston goes up and down the pressure in the crankcase is used pulse the fuel pump. Check this passage and all the gaskets. You said your dad had the carburetor apart. Did he separate the two lower plates |
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Post by juggaloassassin183 on Jul 16, 2009 3:14:23 GMT -5
im guessing the fillter in the tank hand some crude on it that desolved away by the fresh fuel i randomly tryed to start it the other day and it tryed the first time and went the secont pull
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Post by lesorubcheek on Jul 16, 2009 7:18:23 GMT -5
Glad to hear you got her going. If you think the fuel filter may have been partially clogged, it probably wouldn't hurt to just go ahead and replace it. If there is some crud in there, it may end up making its way to the carb, and then it'd end up clogging the screen there. Again, happy to hear its running!
Dan
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Post by mikem on Jul 16, 2009 7:30:43 GMT -5
Glad to hear you got her going. If you think the fuel filter may have been partially clogged, it probably wouldn't hurt to just go ahead and replace it. If there is some crud in there, it may end up making its way to the carb, and then it'd end up clogging the screen there. Again, happy to hear its running! Dan Dan's right....$1.59 spent here is cheap insurance  |
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Post by MCS on Jul 16, 2009 9:42:56 GMT -5
I've actually had luck spraying these with carburetor cleaner and letting them sit for awhile and then blowing air in the fuel line connection. Leave the filter on the weight and do this. Make sure the fuel line isn't mushy. If it is, it will suck down and close off. I was wondering if we would hear the end of this. Lots of times we never hear back. Thanks for the update |
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