I had to install a new battery. The Yuasa wouldn’t supply enough voltage to keep the starter pinion engaged. The battery was 5 years old, but it’s had the best of care, been kept charged, and has seen very little use,. It”s also been kept in a warm garage. This battery is big. I remember the trouble I had putting it in. Getting it out was even worse. I finally had to pull the airbox to get the battery out that way. It wasn’t coming out from the top — even with the subframe bolts removed.
After a bit of research I decided to go with WestCo 12V30 sealed AGM. This battery is slightly smaller that the Yuasa, so it easily slid in from the top, and I didn’t have to loosen and tilt the battery tray. What a difference this battery made. It really cranks the engine, better than the Yuasa ever did.