Newly purchased a 02 SV650S off Craigslist, stock bike, little over 4900 miles on the bike, I think the bike has been sitting for a while and I just put in some fresh fuel amixed with carb. cleaner in the tank.
The engine starts well, idles well with choke. I take it out for 6 mile ride, during the ride the engine seems to surge around 4000-45000 rpm, mild surging but noticable. Once the engine is fully warmed up, I came to a stop, the engine stays at 2500 rpm without choke, then idles goes down to 1400-1600 rpm.. then it drops down to 1000-1100 rpm every few seconds and back to 1400-1600 rpm. Engine doesn't die on its own, but the irratic idle continues, even after the fan kicks on.
I wonder what the problem could be? dirty fuel filter?
-fresh fuel (w/carb. cleaner) mixed with old fuel?
-carbs need a throttle sync?
-weak or leaky fuel vacuum?
Can anyone suggest what could be causing the surging at 4000-4500 rpm?
and/or irratic idle?