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It sounds like one of two things. One, the jets in the carb may be clogged. The way you're describing it, it sounds like the main jet in the carb is clogged. You're running off the slow speed jet. When you open the choke (enricher) you're adding a bit more fuel and air improving the performance a bit. If it's te carb, it needs to be completely disassembled and soaked in a professional quality carb cleaner and thoroughly gone through to ensure all passageways are clear.
The next problem is the exhaust system. I've seen bikes do this before when changing a camshaft. Remove a stock cam and install a high performance cam and the bike will no longer run. The reason is that the baffles in the exhaust system were so restrictive that the engine could no longer "breathe" with them in there. Removed the baffles and the engine ran fine but was too loud for the owner's liking. We replaced the stock system with a free flowing high performance muffler system and the bike ran great.
Could be that you need to go up one jet size.
When choking a motor, your richening the mixture with more fuel, less air.
So if you must choke it, you must need more fuel.
As for electrical. some bikes have a rev limiter when you hold the throttle wide open You may be reaching the rev limit.
A rev limiter with turn the power on/off the coil superfast, keeping the rmp at a maximum factory setting, and the motor breaks up at full throttle.
Some cdi's have and adjustment that you can set your own rev limit, or you can buy a cdi with no rev limit.
Hope this helps
the carbereter jets are blocked up,, strip it out and clean them out
but dont go pokeing a bit of wire into any jets or you will distroy them
if jets are blocked the bike will normaly only run with full choke on
Sounds like you need the carbs cleaned and synchronized, then the idle set once the bike warms up. May also have a cracked intake boot, or a vacuum line off.
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