Ok, just to make sure I followed it all: The #3 exhaust pipe is cooler, but swapping the plug leads on the #2 & #3 cylinders doesn't move the problem to #2. Also you checked and there's good spark (fat & blue is good) on #3. So this suggests the electrical side of things is fine.
You need compression and fuel checked next. Compression is probably the least likely, but its an easy check. Just get a gauge and check all the cylinders. Remember to check with engine warm and the throttle held open. If its good (or least passable) then fuel is the likely culprit.
If you're happy its a fuel issue then clean all four carbs while your at it.
hope this helps...Sam
dannyh wrote:
I will have to get new spark plugs. However, I tried the spark test with existing plug. I pulled the plug, attached it to the wire, rested it agaist the block, and cranked the engine over. It sparks just like normal. The spark was a blue color. Does that mean anything?
I will have to get a new plug and see if that makes a difference.