Motorcycles Not getting spark from back 2 plugs

I would try new plugs.

hi moparjoe499.
i am not much good on bikes and i am sure some one might help you out much better than me.
but to try and help you out,try this link.
Power to coils but no spark
or this one.
No Spark Whats Wrong
or this one.
RUN 2 1 2

1 and 3, and 2 and 4 are on the same circuit. When for example 1 fires to combust, 3 is at the bottom of it's cycle and fires too.
From this perspective, begin at the coils and work your way back and look for the obvious, broken or pinched wires, however most likely your coil is the culprit. If you have the ambition switch the wires between the coils, spin the starter (easier with the plugs out). If you have spark you know for sure. Almost 30 years old I'd just up and change it, and maybe consider changing both. Coils leak and lose efficiency with age and they can be a bear to get to.

NO - SPARK
Check for spark at spark plug.
1. If no spark, test the wire to the coil with test light and see if you have power to coil.
2.If no power to coil, make sure your on/off button is on and working.Use test light.
A. Power at the switch but not at the coil indicates a broke wire from switch to coil.
B. NO power at the switch indicates ingintion switch is off or faulty and not sending power to your switch , make sure key is on. Use trest light.
3. If you have power to the coil but no spark from the coil - replace the coil

SPARK
Check for spark at the plug
1.If you have spark at the plug, but not starting - check that your carbs are getting gas.
2.Petcock Could be off, Fuel Filter could be clogged, Carbs could be dirty or clogged and your not getting any gas.
3.Pull spark plug - If no gas present then your not getting gas, if wet then you getting gas and your flooded. Make sure you have good gasoline, Bad gas won't burn.
or your bike is worn out and dont have any compression.

With Good gas, and Good Spark, and Good compresssion, the bike will run.

If your not getting gas to your motor through the carbs, pull carb off and thouroughly clean it.

Disconnect all wires from the coil. Use a DVOM (Digital Volt Ohm Meter) to test the coil. Connect one meter lead (either one) to one of the small primary terminals on the coil and the other meter lead to the other primary terminal. Set the meter's function switch to OHMS, R x 1. You should read between 2 -3 ohms. Any higher or lower, the coil is probably bad.

Now, you may can remove the spark plug wires from the plugs and insert another set of plugs in the wires. Make sure the plugs are grounded on the heads. Turn the switch on and turn it back off. When you turn the switch back off, you should see a single spark at the plugs.

Good Luck
Steve

check to see if you have power to the coil with a volt metre if not could be magneto or coil if power to coil must be coil gone get back to me

Cilinders 1 and 4 are on the same coil, so as the 2 and 3 on the other coil.
Remove all spark plugs from engine and plug them in the spark plug leads and against the engine
To check coils easily: switch the low voltage wires from coil 2-3 to coil 1-4.
No spark at 1 and 4 is a sign that the coil is broken.
No sparks at 2-3 is a sign that the ignotion switchbox is broken, or the pick-up coils for 1-4.
Here also, switch the wires of the pick up coils. If allways the same plugs sparks, the switchbox is broken. If the other plugs sparks, then the pick-up coil is broken...

Hope it helps

without a manual can you set-up the timing mark on flywheel
an see what cyl is compression stroke to find #1 cly

coil 1 are spark wires 1 and 4 cyl

coil 2 are spark wires 2 and 3 cyl

now if still have trouble then (if same plug connection) switch the around inlet plug on coils form bike wire harness or swap spark wires