17-06-19, 08:46 PM
I'd take out spark plug on 3 and check that the cylinder isn't flooded. Crank the engine a few times and look for fuel spraying out of the cylinder. If it's not flooded you could check for spark while you have the plug out. Be careful not to light yourself on fire :lol If it is flooded the float valve in carb 3 is probably stuck open. If it's flooded check the oil level. The petrol washed down the cylinders and contaminates the oil. If it's not flooded put the plug back in. Turn the choke on and start the engine. Let it run for a few minutes with the choke on. Does the exhaust on cylinder 3 start to get hot with the choke on? If it does then that would suggest the pilot circuit is blocked in carb 3 and you will have to clean it. You said there was dirt in the fuel when you took the bowls off did you give the tank a clean? If not I'd give it a clean with some fresh fuel. Was there any water in the bowls? If so I'd check the drain on the tank. If the drain is blocked rain water will collect around the filler neck and get into the tank , then it settles in the tank and the carb bowls and makes starting difficult. To get to the drain you open the filler cap and take the allen bolts out and give the drain a poke and a spray of wd40 to clear it. The main thing is check if it's flooded, if it's not run it with choke and check if cylinder 3 gets hot with choke. If it does the pilot circuit on 3 is probably blocked.