Running rough my bike is not wanting to run faster than 50 mph one of the cylinders sounds like bababa but the other sounds fine.the carbs have been put in synk,is it something electrical or a bent valve.

Check that it is running on both cylinders. If plugs are fresh, pull them and compare. If one still looks like new out of the box then that cylinder is not firing. Or if you have an infrared temperature probe, check the exhaust temp at each pipe is the same.

Sounds like this may be a carb issue,,,, time to have a professional clean, set, and synchronize them!!

You get what you pay for.
The setting for speed are 5,10,16 mph.
You want anything faster you would have to do major rewire of the bike to over volt and current on the motor and additional batteries - cheaper to buy a faster bike.

sounds like carb needs stripping and clean , fit a new spark plug and put new fuel in !

Full disassemble of carbs is needed. Thorough cleaning on jets and airways, vacuum and pilot screw adjustment must be done too.
Check the spark plugs for lean mixture indication and replace them if necessary.

If it's the stock carb, it is a Keihin CV carb. If you've got black smoke coming out of the front cylinder, this means it's running very rich and especially on the front carb. I'd take the carb off and go completely through it cleaning and rebuilding it. I'd also replace the intake seal where the carb plugs into the intake and the intake seals where the intake meets the heads. It sounds like your carb is flooding. Unless you are familiar with these carbs, I'd advise you to take it to an experienced mechanic. These carbs are complicated and not meant for the amateur to be rebuilding them.

Good Luck
Steve

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.

Good Luck
Steve

escape 2001 runs rough, but after a certain speed ( 50 mph ) runs smooth.

sounds like a fuel problem either a dirt blockage or the computor is mailfuctioning

Sounds like low fuel pressure. i.e. fuel pump, fuel pressure regulator, or fuel filter.