I have a 1960's tecumseh 10hp engine that that back fires out the carb and it does run for a little bit but it dies after about 5 min it will not throttle up it just dies it has good compression and it does not smoke i have also checked the flywheel key it is not been sheared i am lost on this thing please help.
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Re: tecumseh engine wont run right
Has this engine been inactive for a long time?? If it has, mMaybe the carb is gummed up.
Any chance the position of the magneto has changed? A second thing you might check (especially considering this is a 1960's vintage) is the gap between the mag coil and the actual magnet is fouled with dirt/rust. That gap is usually about the thickness of a dollar bill.I have used fine sand paper in that gap to clean it,
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I bought a brand new 13 hp Tecumseh on my rider,was trouble from day one,fought it tooth and nail,finally took to shop,they put a brand new Taecumseh carb on it,couldn't get it to run,went to a dinky lawn mower shop,was told the carb was not the right one,wow,they sold me a used one that looked way different,but it worked super,so try another non-tecumseh carb or fight it forever.
When you say crankshaft stops when cylinders fire I am assuming this is during start. This is caused by a flywheel key problem (Partially sheared) A flywheel key will partially shear if there was a sudden stoppage of the engine. I e. you hit something that stopped the blades right away.
I am pretty sure you have a flywheel key problem as this appears to be an engine timing problem and it is firing too soon. (again partially sheared flywheel key causes timing to advance. If there is not a problem with the flywheel key the next suspect would be the mechanical compression release.
A note about flyweel key replacement. Most of them are aluminum or soft metal so that the crankshaft does not shear off with a sudden engine stoppage. Just make sure to use a Tecumseh
replacement flywheel key and not one from an auto parts store.
back fires out of exhaust implies too much gas at high end. caused by : dirty air filter, carb setup wrong(high float), ignition trouble.
a miss from poor ignition on the next stroke can be too wet even when the carb is set too lean so rule out the ignition problem. rule out the air filter problem. clean carb.
If you want a 'drop-in' replacement, you will HAVE to source a carb that was fitted as original equipment. Following the demise of Tecumseh's engine division, supply is limited to 'old stock', but there is fair spares aqvailability at present. A newer 'primer start' carb will fit, but you will have to remove all the choke operating mechanism. Don't fit a carb from a larger or smaller engine - the mixture will be wrong, and the engine will never run properly.
Replace the spark-plug, check the quality of the fuel(gas that is mixed or was stored more then three months is stale and wont fire correctly) make sure the fuel and air filter not clogged. If there is no change then your problem may be more technical, a nest may be restricting the govenor or you missed something with the carb and there still is debre causing it to stall.
First check your fuel, if it smells stale or smells like paint thinner, your carburetor may need to be cleaned. If the fuel smells ok then you'll need to take the bowl off the carburetor be careful of the bowl gasket, it will probably stay on but when you put the bowl back on be sure it seats evenly around. With the bowl off check to see if there is any water, debris or anything else that don't look like fuel. If your engine is a Tecumseh then you should also check the bowl bolt. Assuming it is a Tecumseh the bolt will be one of 3 different types but what you need to look for is the holes on the bolt, there will be 2 down by the head of the bolt and sometimes 1 real small one at the top of the threads (use a twist tie from a loaf of bread with the paper cleaned off to clean the little hole). If the little hole gets clogged the engine won't run. If everything looks good then put the bowl back on and try it. If there is stuff in the bottom of the bowl the you might want to take the carb . off and clean it and to bee on the safe side while it's off put a new carb. kit in (carb kits usually run about $10 to $15 dollars). Any questions on taking the carb. off, cleaning or rebuilding feel free to ask.