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formulaguy 02-11-2007, 03:24 PM If anyone could help sure would be apreciated. I have a 1990 formula plus with a 521, I am only getting fuel to 1 cylinder. lots of spark. checked and cleaned both carbs even switched them but still no fuel to the cylinder on left side of sled (when sitting on it). any ideas? Thumbdoctor 02-11-2007, 05:05 PM Do a compression test to verify if the rotary valve is rotating. You might also remove the carbs and look down the induction tubes with a flashlight to check if the rotary valve is turning. Does it fire when you prime it? formulaguy 02-11-2007, 05:30 PM Do a compression test to verify if the rotary valve is rotating. You might also remove the carbs and look down the induction tubes with a flashlight to check if the rotary valve is turning. Does it fire when you prime it?[/b] I took the rotary cover off it does rotate when i pull it over slowly. it will run on one cylender but the pto side wont fire at all. Thumbdoctor 02-11-2007, 05:36 PM I took the rotary cover off it does rotate when i pull it over slowly. it will run on one cylender but the pto side wont fire at all.[/b] Take the clutch off and check the PTO crank seal formulaguy 02-11-2007, 05:42 PM Take the clutch off and check the PTO crank seal[/b] will try that tomorow. and let you know. thank you formulaguy 02-25-2007, 07:03 PM will try that tomorow. and let you know. thank you[/b] Thanks for your help, I did a compresion test and pulled the top end off. Turned out there was a hole in the top of the piston the size of a dime. All fixed and running great.. | ||