I have a 6 1/2 horse power motor 208 cc keeps bogging down at full throttle it runs fine until I go to full throttle this is a new motor that I put on my minibike why is it doing this any help

sounds like a possible fuel blockage either in the fuel line or carburetor. may want to take the carb off and clean it really good.

Harry, dirty carb or injectors.
Check the attached links,Manuals and guides, Good luck with your Bike
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ATV Service and Repair Manuals
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Evinrude 50 HP Bogs at WOT - MarineEngine

www.marineengine.com > ... > Johnson Evinrude Outboard Archive

Aug 6, 2002 - 17 posts - ‎3 authors
83 50 HP Evinrude - sat out in weather for 4 yrs. Been cleaning ... At WOT, she bogsdown. Up to. ... Yes, this boat/motor is new to me. Actually ... Mercury 50 1987 bogs down when full @ full throttle
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motor bogs down at full throttle Page: 1 - iboats Boating Forums ..

Brad:

Go back to the carburetor adjustment screws and snug them down gently. Do not use force on those screws or you'll damage the needle valve seats. Turn both screws out one and a quarter turns out and start the saw. The motor should stay running.... if not adjust the screws until it stays running. Turn one screw in until you hear the motor start to stall, then turn that screw out just a little bit. turn the other screw in until the saw starts to stall, then turn that screw out a little bit. Now if the saw bogs at full throttle, turn one screw out one quarter turn. See if the saw runs at full throttle... if not turn that same screw in to where it was and try the other screw the same way. If you're good, you can adjust the screw while the saw is running to get the best full throttle run. This is not an exact science, and it takes time and many adjustments to get the saw to idle and run at full throttle. Good luck... and have patience.

Running too lean at full throttle. Yes you need enrich the high speed mixture a little but make sure the blower has warmed up first that if the carburetor is adjustable.

Remove Carbs And Clean Then Test Again

I have a ttr 90 that idles well but bogs down at full throttle. Carb is clean and has new pilot and main jets. Seems to run slightly better with intake off. Which leads me to believe the mixture is rich. No adjustment on carb. Stumped?

I’m happy to assist further over the phone at https://www.6ya.com/expert/layne_0fccff498c319c32

Usually that is a sign of the carb not being adjusted right. Run it at full throttle and adjust the main mixture needle (usually on the bottom) until it runs the smoothest. Set it in the middle of the range where it runs smooth. Then set it down to idle and adjust the idle mixture until it runs smooth at idle. Accelerate it rapidly and if it bogs or hesitates turn the idle mixture a little leaner (clockwise) and try again until it works right. That should get you very close. Try tweaking it a bit from there. as the microscopic specks clean out of it, it may need more adjusting.

The problem is that your carbeurator is gummed up. Get a can of carbeurator cleaner spray at any auto parts store. remove the air filter and put two squirts of cleaner into the air port hole. start it up. with the assistance of a helper, run it and squirt one squirt of cleaner at a time into the air hole until it no longer bogs down.

next time it happens try spraying water in mist form around the throttle body if it bogs, replace the throttle body gasket. if it doesn't bog you may have a bad wire wait until dark start the vehicle have someone feed the fuel very slowly and watch for arching from a wire it will be easy to see when it is dark, replace that wire.