I'm working on a 2011 Big Red MUV700 for a friend. It appears to be hitting the rev limiter before switching into 2nd gear. However, it won't go past 3,500rpm when in neutral before it starts missing and almost cutting out. It doesn’t sound like the traditional rev limiter either as it kind of lopes and backfires a bit at that rpm. I’m not sure if that’s normal for these machines though. I'm assuming 3,500 is way too low rpm for it to be the rev limiter because the oil pressure values for testing in the service manual are listed @ 5,000rpm. Before I really start tearing into this, can anyone tell me at what rpm should the rev limiter kick in at? At this point, I'm trying to figure out what rabbit hole to go down first; engine/FI/electrical or transmission/torque converter/shift valve body. Any info will be greatly appreciated.
Well, I tore into the big red today. Started out checking sensors, air intake, exhaust, and found nothing. I popped the valve covers off and found that the gaps were way to big. I adjusted them down and it ran better. Would rev to 4,800rpm before backfiring and losing power. So, i took the head off and found that the exhaust cam lobe is wore down severly. Also found that the exhaust can follower is dented in on the bottom. Am going to check out the cam chain and guides tomorrow to see if they need to be replaced too.