Try the two sparkplugs 97.. That will show if the spark is failing at revs. There's another thing.. can you describe the bogging.. is it cutting in and out like someone is cutting the ignition about twenty times a second, or just sort of loading up and making noise but not revving. And is it the same revving in neutral or riding it ? Do you think the exhaust could be blocked ? That would cause it to be like that second description there, and perhaps spit into the carb.

That's a big call Randy, but then so's 11,000 rpm. There's a few things I don't like, like bullying(not saying Randy is), and lying(not saying Randy is), and bad dangerous advice; I oppose them wherever I see them. 97 take a look at #41 and #47. Try those things. That will eliminate stuff real simple and cost you nothing. You can check your valves are sealing properly by pulling on the pull start. It will come up fairly solid if everything's fine. If you can pull it over let us know and we can tell you how to diagnose what's wrong there. You should avoid adjusting the valves because those things are quite prone to self adjusting, and if you follow Randy's advice you will have the same problems he says he has so much experience of. If they are adjusted correctly, they don't give problems for years and years..literally.

You shouldn't pick sides just you know what you have no one else does. I myself don't care what people think I know me you know you they know them. But I have over 30 years of mechanical so doesn't matter. Just learning what you find out yourself is the better answer to all. I myself have come across allot of crap and people that always knows best but. You need to do you. Drs say I might eventually die. I'm only on here to help out since my body's giving up. Hope for the best for all . ✌️ I myself still learning!

Not just a, but the. And notice the corrosion. So it's probably worth taking the pump apart for a cleanup anyway.

First place i would start Do you have an OEM carb or is it aftermarket, thats the first thing i would do make sure you have the correct carb on it if its aftermarket look for an OEM on ebay and rebuild it, if you plan on keeping it. One step at a time until we get it figured out.

Welcome aboard.