Just purchased bike from owner who had the bike stationary for a while. While riding it sputters and jerks. Once I open throttle it moves. it only has 9900 klm and it is in fantastic condition.

Dirty Oxygen sensor And Air Sensor Not Map Sensor

Hi Dave:
I see you're riding a 2009 twin. Very nice bike.
It sounds like you may be getting some unwanted throttle input or possibly mis-firing.
It's possible that a tune up may provide some improvement.
I'd be checking the plugs, air filter, clean the carb(s), and make sure the throttle cable and mechanism is functioning properly, from my wrist right on through to the carb.
Happy Riding!

I would say you just need to bring the revs up on it a bit try pulling away at about 3000 rpm

when riding? if so then you maybe moving to fast for this gear to down shift and or you may have a bad spot on the gear

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/tom_db3a51ff0ca57f20

There could be a number of things going on here. First check your oil level if it is lower than normal you could have a sumping issue going on here. Next is to pull your air filter off so you can see your injectors, turn the ignition on and off 5 or 6 times to make sure your injectors are not leaking. While you have the air filter off look inside the throttle body with the trottle plate open and see if the IAC pintle is moving in and out when you turn the ignition on and off.This only controls cold ilde. If all is good you will have to reset the TPS.

There are adjustments on carbs for low speed air intake (air mixture screw)find out factory settings and reset that mixture.Sounds to me like those adjustments are out of sink.If so the bike will run very bad from idle to about 1/4 throttle then run great from there up to full throttle.this definitly sounds like carb problem.

It sounds like a fuel problem. Next time it starts doing this, take the air filter cover and the air filter off. Leave the air filter backing plate on the engine and go for a ride. If it runs better, the carb is too rich. If it runs worse, the carb is too lean. They are usually jetted very lean from the factory to meet EPA standards.

If the bike is fuel injected, the dealer will have to change that as it's not owner servicable.

If you run it too long with the enricher on when it's cold, it will foul the spark plugs. The enricher is way rich. I usually only run the enricher long enough to get the warm enough to run while holding the throttle open or using the throttle lock. Don't run the enricher any longer than necessary. Put in a new set of plugs that try that. Big Twins are bad about the enricher fouling the plugs, Sportsters are the king of fouled plugs when using the enricher. When you purchase spark plugs, just buy the Autolite 4164 plugs. They run as well as anything out there and don't cost nearly as much.

Good Luck
Steve

Have the shop put in a richer pilot jet, aka "slow jet". Also, move the needle clip down one notch for better low end performance.
Can I get a “very helpful” rating on this answer?