Strange thing going on

[tzsuzuki]

I have a 2015 GG 300. Love the bike! Every once in a while for reasons I have yet to discover the exhaust note will suddenly become very loud and crisp along with a momentary reduction in power. It clears up in a second or two. Very erratic might not occurs for several rides then do it several times on a ride.
I thought the O rings at the exhaust spigot might be failing, replaced them.
I do have a Lectron carb and HOH silencer otherwise stock and about 60 hours.
Any thoughts?

[GGRider01]

Could be a momentary lean condition.

[slocalspode]

Power valve sticking open due to carbon build up.
Mine will do it too from time to time.
JJ

[pigpen966]

+1 on the power valve, my 13 did it when it was new.

[CombatYoga]

Another vote for the powervalve sticking.

It was happening on my 2014 300 - the exhaust note would change just as you said.

I found that it was happening over log crossings or other abrupt landings.

I cleaned it up as best I could and it improved, but I am in the middle of a top end job and plan on taking it completely apart to get it cleaned. If I can find someone to bead blast some of the parts I'm going to do that.

[TheLetterJ]

Easy Off (or other) aerosol oven cleaner works great for cleaning carbon of of STEEL parts, just try not to use it on anything aluminum. I just cleaned the PV flapper and both drums with it. Spray it on, let it sit overnight, light brushing with a stainless brush, rinse with hot soapy water, and they look brand new.

I thought about glass beading the drums, but I figured the slightly rough finish would allow carbon to accumulate faster than the polished finish of OEM. Good idea for the flapper anyway.

[Zman]

I use the wire wheel to clean it off after you disassemble it.

[Jakobi]

Originally Posted by Zman

I use the wire wheel to clean it off after you disassemble it.

This is what I do too. Quick and easy and not all that messy.

[tzsuzuki]

Thanks for the replies.
I thought that might be a possibility (power valve). I have around 70 hours I will have to look into that.
I was worried that it might be a air leak