video attatched. need help,

[radodrill]

key in off or lock position will not drain the battery; on and park will.

since you can jump start it, the starter motor/relay are fine and since it'll keep running while started the charging circuit is fine as well; looks like a bad battery.

[johnnys11]

The previous owner stated he had just recently replaced the batter but maybe me trying to start it multiple times as shown in the video killed it.
But I bought a multimeter and when the bike is off it reads at 10.00v+ when put in the on position it's about 8.8v. When on around 12v but should I buy a new batter or buy the tender batter charger?

[radodrill]

The question is how the PO defines recent; and MC batteries can die quite suddenly.

Fully charged, the resting voltage should be around 12.8 - 13 V.  Under about 12.2V the battery is almost empty and you tend to run into trouble starting the bike.  Under 10V is typically a dead battery.  With the bike running, the charging circuit should put out 13.5 - 15V.

There are ways of testing the stator and reg/rec, but as it stands the battery appears to be the most likely culprit.

[johnnys11]

Ok I went to advance auto and they did a battery test and said I only need a charge so they charging my battery and I have to pick it up tmro. I really hope that's all it is!

[jsyzdek]

If you find out your battery is dead (and my bet is that it is indeed dead because it's been in discharged state for a while) - I recommend to replace it with a Li-ion battery, for example a Shorai:

http://www.amazon.com/Phantom-APP14A2-BS12-Polarity-Powersports-Battery/dp/B00819SHJ8/ref=sr_1_fkmr0_3?s=automotive&ie=UTF8&qid=1399232380&sr=1-3-fkmr0&keywords=Phantom+APP14L2-BS12+Black+Small+12V+14Ah

make sure you get the correct polarity.

Li-ion batteries, even when you run them dry - will recharge and be like new (just like the one in your phone or laptop). And they can stay in discharged state for months without any negative effects. Lead acid will deteriorate quickly when left discharged, and any deep discharge will affect it negatively (it will never fully recharge). That's why you need to leave it connected to a battery tender when you leave it alone for prolonged periods of time.

I bought my bike with a 'new' battery, but it wasn't ridden for a few months, and was not connected to anything. Even though it was only 6 months old - it was trash. Now I'm running on Li-ion and have been loving it. I can jump start my car from my motorcycle battery...