If it is a lack of spark your plugs should be getting at least a little fouled, are they at all oily?
If it is a lack of fuel your plugs should be dry or even turning grayish. If they are turning grayish that is a sign of too lean, and you could burn a hole through the top of a piston and or worse.
I would take it back out get it warmed up at moderate speed, then wide open for a minute or so, then immediately shut it down and inspect the spark plugs.
Spark plug color and condition is one of the best ways to diagnose two stroke issues.
I'm guessing high end jet picked up some crud.

Yea more I think about it it does sound like the high speed jets may have a clog. Thanks yall. Soon as I get time I will pull the carbs and then get back to yall and se if I get the problem fixed. Thanks everyone. Yes bottom 2 plugs where oily

Could be water in your tank that is pocketing near pickup tube when bow comes up. Had it happen to me several times. Also a pickup tube broke into and would suck air when fuel moved during acceleration, but engine ran normal at idle.

If the bottom two plugs were oily it could also be two bad ignition coils on those plugs. I have had Yamaha two strokes do that on occasion.

This is probably not the issue but...a friend of mine was having a similar problem. Ran fine at idle through about half throttle but if the throttle was moved any higher it just died. No sputter, just immediately dead.

He spent a long time trying everything he could think of. He had the motor in the shop and they couldn't find the problem. Replaced fuel system, rebuilt carbs, replaced coil (even though it tested good). He eventually found a bad wire that was broken internally. The wire made contact inside the insulation when at idle. But, when the timing advanced, that wire was stretched a little and broke contact.

I would change the fuel line first don't get the grey one I changed mine out to black gas line worked for me

X3

I have seen this when the exhaust tube gets plugged.

Another question about my motor. If it may be starving for fuel(stopped up carb jets,bad fuel lines, fuel pump ect) then why when I choke it it boggs down worse? I have dealt with fuel issues before and usually when u choke it it picks up and goes for a bit

Just want to narrow things down a bit before I start pulling carbs. Thanks fellas

when you "choke' it you are also cutting off a lot of air flow. which is why it bogs down.

Sounds like a high side fuel problem but I would also check the SP wires to each cyl. I have seen them break down at higher rpms. If it is the lower two cyl. I would lean more toward a carb problem though.

Rebuild your fuel pump.

That makes good since now about the choke. Thanks. Yea I'm fixin to pull carbs and get em good and clean and then do all the fuel lines and if that dnt fix it il rebuild the fuel pump

I had the exact same problem. Would idle absolutely fine, but when id cranked it open, it would bog down and die. Rebuilt the pump, and no problems after. Those little diaphragms wear out easily.

If you have two damp plugs I'm guessing it's not a lack of fuel problem, I think you have an ignition problem in those two cylinders, Bad ignition coils, bad plug wires, I've even had bad plug caps.

Yep had the same symptoms on a 45 horse tried everything even a different pitch prop.
Rebuilt the pump and it ran like a striped ape.

Run a can of liquid mechanic through it- Sea Foam
Another simple check is to make sure your throttle cable did not stretch, I've seen this happen when the boat idles fine and then never achieves full throttle.

Are you running with the tank vent open???

It's a built in tank.I pulled it out completely and cleaned and put new pick up tube and all new vent and fill line last year.has all new fuel line up to the motor and new fuel filter.also new primer bulb. I got all new fuel lines for carbs and new fuel pump on the way.also got new gasket kits for carbs cause if the new lines and fuel pump dnt fix it I'm gonna tear down the carbs and give em a good cleaning.if that still dnt fix it il start looking at electrical issues.hope this fixes it tho

I checked throttle cable. Carbs open up all the way but just not getting the rpm's