12 HP Techumseh OHV WTH Is Going On With This???

Ok i got a 12 hp ohv tec engine vertical shaft when i got the tractor it started hard but after sitting this winter i cant get it to run at all.
Carb is clean,has good spark the stater works the engine turns good, What the issue is when cranking it over it turns over hard and has a kick back like affect. Like it has too much compression,i checked the rockers and adjusted them to the factory setting of .004 but still does the same thing.
With the spark plug out it turns over fine,i dnt know wth is going on with it?

how old is the fuel?

I dont have a fueltank hooked up as of now do to it sittin on the bench but even when spraying carb cleaner in carb it will not fire up.

make sure the throttle is wide open with the choke off, when trying to run on carb cleaner.

yea ive tried that im stumped big time on this.

There are only so many things it can be

What kind of ignition does it have, magneto or coil?

Set up like a b&s has mag on the flywheel then the coil i cleaned both with wire bush then gaped the coil from the flywheel

Does it have adjustment for timing or just gap?

If you have compression, fuel and spark, and the timing is correct, it should run.

I would install a new plug, and try it.

Sometime plugs will spark outside, but fail under pressure., also make sure all the elctricky connections are good and clean.

Its more that its not turning over fast enough its like it wont even get oe whole rotation when cranking over

You didn't mention slow cranking, just seemingly high compression.

get a bigger battery, check the solenoid, and make sure the starter isn't dragging. Did you bypass the solenoid with a booster cable?

This has been covered in a dozen threads.

I've had one of these, they are hard turning. Starter, wiring, and battery need to be in good shape.

yea maybe the starter is just weak, idk im going to try and keep an eye out for a briggs

Has the battery been frozen?

Motorcycle batteries are generally only good for a year or two, GT and Utility batteries not much longer.

beeing froze will kill them.

Even if only 1 cell is bad, you are screwed.

seeing the engine is sitting on my bench ive been using jumper cables from a car battery direct to the starter

Ok make sure that battery is fully charged. then make sure your ground connection is on good clean steel.

Be aware

The connections at the starter are key.

the thin edge of a booster cable clamp does not make a good connection on a threaded starter post

Good ,solid connections are required at all starter posts

Have you checked your values I had the same problem with my Briggs. (I find my self regapping mine ever couple of Weeks)

I fixed it lol took it out back and junked it! Lol

Lol, ill take it off your hands

offroadredneck wrote:

Have you checked your values I had the same problem with my Briggs. (I find my self regapping mine ever couple of Weeks)

yea always gotta have good values lolkidding man, get it fixed? or just decied to scrap it

I might put it on here for part out idk yet lol

One more suggestion before you give up?

You said it had been sitting on the bench... Was it sitting level? When an engine sits off level for a period of time, oil can seep past the rings and hydrolock the engine. If you get bored, pull the plug out again and tip the engine so the plug hole is over a catch pan- Who knows? Might have a big ol' mess of oil go drooling out of the cylinder!

Yeah ive tried that plus i have a motor holder i made so it sits even.
The motors sittin and is either going to scrap or getting parted out anyone interested lol