TurboJamie
TY 4 Stroke God
Well at least we know what it is and that its not doing any harm or causing you anything other than a slight annoyance. Think of yourself as lucky as it appears you have a sled making more hp than the others. You have a couple quick options which might band aid fix it just for testing purposes. You could verify the stock secondary spring positions ( I am not sure the degreese it ships at) and back it off 10*
IE Yamaha has two numbers on their secondary and helix. So for instance if its in #3 and #2 you would have 60* of wrap. You could reduce this to 50* which will slow upshift and might cure the problem.
Hopefully this makes sense to you and you can proceed how you feel most comfortable with. You could also add some weight to the stock weights via yamaha rivets this might stop the issue as well. Lots of ways to skin the cat so to speak.
IE Yamaha has two numbers on their secondary and helix. So for instance if its in #3 and #2 you would have 60* of wrap. You could reduce this to 50* which will slow upshift and might cure the problem.
Hopefully this makes sense to you and you can proceed how you feel most comfortable with. You could also add some weight to the stock weights via yamaha rivets this might stop the issue as well. Lots of ways to skin the cat so to speak.