Dies when opening throttle - 2003 Yamaha TT-R 225

Clean Throttle Body and MAF (mass air flow sensor). Classic symptoms of bad idle. The throttle body isn't shutting properly and letting air in. At highway speed it is fine because the throttle is purposely open.

https://www.google.com/search?q=2000+Dodge+Neon+clean+throttle+body

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You reported that most of the items I would've suggested, you have checked...
Good job.
A couple more things:

• Replace fuel filter, it's in the gas tank
• Check and clean the Spark Arrestor screen at muffler, when they plug up, it's a major restriction to exhaust gas flow
• And check and adjust High/Low screws at carburetor, video attached.
• And clean or install rebuild kit for carburetor

Good luck...

One more...

What is the fuel pump pressure? When you put the throttle down, there is not enough fuel to match the air inlet and it dies.

if there is electronic throttle then probably needs replacement, get second hand one , or otherwise can try to take it out and clean it, if there is an access to electronic part of it try it open carefully and clean contacts with some alcohol, sometimes it helps

is this a v-twin engine or has the unit been stored for quite some time with fuel in carburetor.inspect fuel jet and tube for restriction.

either its your air filter or intake, probably on the carb, clean your carb, chck our filter, your good to go

After you start it and are in the second stage of the choke (half choke ) let it run for awhile until it warms a bit then try openning choke and going to full throttle.

Problem may be idle control. In throttle body, butterfly valve can get gummed up and stick causing motor to start but then die. Remove air passageway from front of throttle body and spray intake cleaner or chemtool B12 inside while holding throttle open. This should clean up gummy residue and allow idle control to work properly. This works for us.

i would say your truck needs a tune up .that should solve your problem.hope this helps.

Most die grinder throttles feature a spring-loaded "kickstand" mechanism between the throttle lever and the body of the grinder, which prevents the throttle from opening (being pressed down towards the body of the grinder) without operator intervention. This prevents the die grinder from accidentally activating.