27 hp v twin on exmark z mower, sometimes when starting does not have to be warm happens ive noticed when cold in morning, hit the key and spins like no compression will pop out of the exhaust muffler hit the key a few more times and it will start but sounds like running on one cylinder will smooth out and run fine the rest of the day. acr? what is that (acr) thanks al miller

The flywheel is locked to the crankshaft with a aluminium key. If the engine is abruptly stopped this soft aluminium key will shear off and let the flywheel turn.The shaft quits turning and the flywheel don't. This is to avoid breaking the crankshaft. When the flywheel turns or spins on the crankshaft it puts the spark timing out of time and will not run, it might backfire or spin and stop or just spin over.

The backfire indicates a timing problem. Did you hit something at some point in the past? If so you may have damaged not sheared your timing key, this would still allow you to start your machine. If your mower runs for a short period, it warms up enough to put timing out. What I mean is when hot expansion, when cold contraction. Check your shear key for the problem. GOOD LUCK FRIEND.

check that the battery isn't dead. if it's good then check the fuse to the solenoid, then check the solenoid by jumping across the two terminals. if it cranks over by jumping the solenoid then it is either defective or you have a wiring issue from the key to the solenoid

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Does it do it every time? First try and turn your engine by hand counter clockwise and try to start..sometimes the engine stops on a compression stroke and Is Under too much pressure for the initial start,..happened to my cub cadet laast week...,,if it turns and still gets a click...test or charge your battery..if it is ok you either have a bad solenoid or starter...first find the solenoid and croosing the two big post..it should spin the engine..if it spins it is your solenoid if not the starter is bad...not a hard job for either...both can be purchased at your local mower place...giid luck

check key switch first, and fuse.

clean your carb and put new fuel filter inline, and a set of plugs !

Try new plugs but I reckon you have one weak coil. It takes less voltage to fire a plug in a warm cylinder

Hi, have the same problem with my 1995 legacy gt twin turbo and the problem lyes with the ecu temp switch, it sound's like the ecu thinks the engine needs more fuel to start and run

Sure sounds like an elusive safety switch to me. There's usually one on the seat, the blade control, and the brake.

ck for 12 volts at switch in off and on I think switch is bad