i have a 2007 Yamaha apex 4 stroke 4 cylinder that has a starting issue. got it few weeks ago owner said it has a new battery. i found it to always start slow (starter turn over sluggish) sometimes not enough for it to even start. checked the battery showed the year 18 on it and says 220 cold cranking amps so not a new battery. but charged it up showed 12.8 before i charged it and 12.9 after charging but still have the same result. all my battery and starter cables are good n tight. i can see the starter so shouldn't be too hard to replace if so. wondering if this sounds like a starter on its way out maybe? maybe i need to buy a new factory battery and try from there.