Question about Tecumseh Enduro VTwin Vertical Engine with Electric Start 20 HP 1in x

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Sounds like carb is dirty

Posted on Sep 09, 2010


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Engine keeps backfiring under load motor is an enduro xl 13.5 hp

Need Make/Model/Year/Engine Model/Deck Size, and hours on meter if you have one. A short description of the events preceding the beginning of the problem is also helpful.

Several possibilities:
1. Needs a valve adjustment or a valve job. Start with adjustment.
2. Needs new plugs. Start with new plugs.
3. Shear pin under flywheel is slightly damaged throwing off the timing. Remove flywheel examine shear pin for any damage. Just go ahead and replace it; if it even looks nicked or sliced.
4. Coil, or spark plug wire, is going bad. Very hard to test a coil for weakness without test equipment that the average person doesn't have. Check the first 3 problems, first. If it still backfires, then replace coil.
5. The other thing that causes backfire is fuel mixture too lean. On a small engine this is not usually an adjustment problem. It may be the fuel system/carburetor is dirty or partially clogged. It may also be an air leak in the gaskets of the intake manifold. If nothing else solves the backfire, remove the carburetor and clean or rebuild it. This is the least likely of the options so save it for last.

If compression is good and cylinder leakage is minimal, but a cylinder is misfiring or shows up weak in a power balance test, it indicates a fuel delivery or ignition problem (fouled spark plug or bad plug wire). A power balance, or cylinder balance, test should be run on a twin cylinder engine.

If an engine is hard starting, runs rough, misses or lacks power, run a cylinder balance test to determine if both cylinders are operating to their full potential. You will need an engine tachometer, a spark tester, and an insulated screwdriver.

1. Using the spark tester, with the plugs in, start engine and verify spark is equally good on both cylinders. Remove spark tester.
2. Connect engine tachometer.
3. Run engine at top no load speed. Note rpm.
4. Ground one cylinder spark plug with screwdriver. Note rpm.
5. Ground other cylinder with screwdriver. Note rpm.

The difference in RPM between the cylinders should be less than 75 rpm. If the difference between the two cylinders is greater than 75 rpm, the cylinder with the least rpm loss is the weakest and is a potential problem.

Note: If the spark plugs are new this could be an indication of a weak coil. Of course it could also be compression (rings), or valves.

Mar 24, 2015 | Garden

1 Answer

V twin tecumseh

If it not getting gas or is not fireing the fuel pump must be working or the other cylinder would not be getting gas sounds like rings bad or head gasket but make sure it is getting fire first

Nov 08, 2013 | Tecumseh Enduro VTwin Vertical Engine with...

1 Answer

My tecumseh will start but will not run when the chocke is of and will not get to full throtel

Sounds to me like you need to clean your air filter. Try the fuel filter, too, but I'll bet it's the air filter!

Feb 03, 2012 | Tecumseh Enduro Horizontal Engine 5 HP...

1 Answer

Spark plug specs

The plug you need for a Tecumseh Enduro OHV16 is a Champion N4C, and it should be gapped at .030 .

Hope that helps.

Jan 01, 2012 | Tecumseh Enduro Vertical Engine 16 HP 1in...

2 Answers

Carburators are not getting fuel

have a murray 20 hp tecumseh has gas in the bowl but wont start unless u spray the carb then it dies when u stop spraying any ideas

Apr 14, 2011 | Tecumseh Enduro VTwin Vertical Engine with...

1 Answer

20 hp tecumseh, won't run unless choke all the way out and gas lever all the way up, also backfires. spark plugs good and seems to be getting plenty of fuel. Any ideas?

If the choke has to be on its not getting enough fuel into the engine. The carby and fuel lines etc have to be cleaned out. Regards Phil

Apr 12, 2011 | Tecumseh Garden

1 Answer

One cyclnder is not getting gas where can I get the relay or check the one on it

hi here is web site,174

select your model from the list let it open and save a copy if it lets you or make a note of website

please check that inlet and ex push rodes are opening and closing the valves , on the non operating cyl

please check for valve clearance

does it has compression on that cyl ?

does it have spark on that cyl ?

is this engine a twin carb unit and do they have soleniods at the bottom each carb if so i suspect the solenoid on the non operating cylinder is not getting 12 volt to open the fuel flow

as a test use 2 wires and connect 12 volt + battery lead to 1 pin in connector to solenoid and connect other negative black lead to the other wire in the connector ( this should activate solenoid & open the fuel flow ) you have to get someone to help you

be carefull ie sparks and fuel !!!!!!

try starting and see if now runs on both cylinders iff so faulty solenoid

replace that solenoid

if that does not work and 1st suggestions are all ok i would then look at the carby for the cylinder that is not operating
it copuld have a blockage etc have a look and let me know

cheers paul

Aug 08, 2010 | Tecumseh Ov691ea 22 Hp 22hp Lawn Rider...

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