Starting Engine Compression

that should be fine for it to run--they are low compression engines--i am running 40 psi in one cylinder.

Take these steps, and you will likely get your engine running...

1. Go to the supermarket
2. Purchase beer, ice, steaks, and charcoal.
3. Invite locals on this list and mechanics in your area over for a "D2 Fixin' Party"


Seriously, first off have you actually got fuel getting into the cylinders, and have you checked for spark at the plugs? I just had a no-fire situation that was caused by
the mag gear being off a tooth due to the tractor hitting my garage at ramming speed, so it could be anything. You've got a rebuilt mag... are you really really sure that
it was installed correctly and properly timed to the engine?

Try to start it... remove a spark plug... it there fuel getting to the cylinder? Ground the spark plug by touching it to the side of the engine and have someone turn the
pony motor over a couple of times... you should see a spark. Got spark and fuel? I'd check the timing next, although you should check that before you try to start it so
you don't hurt yourself. After that, refer to the "steaks and beer" procedure above.

The compression differential is more important than the number... it could indicate a ring or valve problem in the low cylinder or something like that... but not necessarily...
and your engine would run anyway.

Of course, this is all general small gas engine troubleshooting advice... not specific to pony motors, which I know nothing about since I don't have any diesel
tractors to play with.

Sue

Try a full gas tank or adding a small bit of air to tank ; Gene

Ensure that the mag timing is correct. It may look OK, but it may be out by 180 degrees.

Years ago I had a D2 5U that we removed the mag from the starting engine, and in my over eagerness to show my Dada I can do it, got the timing out by 180 deg. Swopped plug wires around, and voila, she roared into life at the first pull.

By then the area around said D2 was pulverised into a fine dust from yanking on that start rope, and some very new "delicate words" were added to the already colourful Afrikaans language. Cats don't react to the owners' language at all. They just stay mute (and yellow)...