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kkim · March 4th, 2009, 05:20 PM

Cool. You need 3 things to start an engine... air, fuel and spark.

Unless something drastic has happened since yesterday, we can assume you are still getting air through the airbox. The back fire confirmed you are getting spark. The only thing left is fuel... or more so a fuel delivery issue. I know you just bought the bike, but did you see the bike actually start up and run sometime before/after the purchase?

If so, we are not getting the proper fuel/air ratio to start the cold bike. I'm trying to confirm you're getting fuel to the carbs. By using "pri" the fuel will flow w/o vacuum applied to the petcock, sort of like the gravity fed petcocks on the older bikes.

BTW, if you are done for the night, turn the petcock back to the "on" position.

Tomorrow, try starting the bike as you normally would (choke on, no touch the throttle, hit start button for about 5 seconds) with the petcock in the "pri" position. The "pri" position insure we are getting fuel to the carbs. If it doesn't catch, do the clearing out a flooded engine procedure and then try starting again.

If it doesn't start, we can continue troubleshooting.

edit- it sounds like you might need to shim your carbs in the future if the temp is affecting the starting, but lets get it started, first.

March 4th, 2009, 05:20 PM	#35
kkim Join Date: Nov 2008 Posts: Too much.	Cool. You need 3 things to start an engine... air, fuel and spark. Unless something drastic has happened since yesterday, we can assume you are still getting air through the airbox. The back fire confirmed you are getting spark. The only thing left is fuel... or more so a fuel delivery issue. I know you just bought the bike, but did you see the bike actually start up and run sometime before/after the purchase? If so, we are not getting the proper fuel/air ratio to start the cold bike. I'm trying to confirm you're getting fuel to the carbs. By using "pri" the fuel will flow w/o vacuum applied to the petcock, sort of like the gravity fed petcocks on the older bikes. BTW, if you are done for the night, turn the petcock back to the "on" position. Tomorrow, try starting the bike as you normally would (choke on, no touch the throttle, hit start button for about 5 seconds) with the petcock in the "pri" position. The "pri" position insure we are getting fuel to the carbs. If it doesn't catch, do the clearing out a flooded engine procedure and then try starting again. If it doesn't start, we can continue troubleshooting. edit- it sounds like you might need to shim your carbs in the future if the temp is affecting the starting, but lets get it started, first.