After a year and a half of sitting (becoming eco-system :'|), my old beloved beater '78 Yamaha IT250 ('Leon') was re-invigorated with a carb cleaning, fresh plug, and fresh tankful. Fired right up, but high-end he seems to sputter. Believe it is starving, but intermittent firing and blue smoke makes me wonder.. rich? Tried fooling with misc. jets and needle positions.
Background: Owned the bike for 10 years and always a 'do no wrong' 2-kick screamin' demon. Never had to do anything like this before to revive him. Any thoughts on effect of sitting?
Carb. is clean, running a 360 main
Low-range decent, mid-range good, high-range sputters
Smaller jet worse (problem occurs earlier -- like lean)
Bigger jet (quite a bit bigger) wouldn't start
Reeds rotten?
Intake is old and petrified - sucking air?
Oxygenated pump gas giving me fits?
Theories welcomed
Background: Owned the bike for 10 years and always a 'do no wrong' 2-kick screamin' demon. Never had to do anything like this before to revive him. Any thoughts on effect of sitting?
Carb. is clean, running a 360 main
Low-range decent, mid-range good, high-range sputters
Smaller jet worse (problem occurs earlier -- like lean)
Bigger jet (quite a bit bigger) wouldn't start
Reeds rotten?
Intake is old and petrified - sucking air?
Oxygenated pump gas giving me fits?
Theories welcomed