Fast idle After I ride for about 10minutes the the bike starts to idle fast and when it does slow down and go bake to normal the check engine light comes on for about 15 sec then it turns off

no
check for vacuum leaks in the inlet system

check intake booth

If the carb is adjusted correctly, the engine will not idle without the choke when cold. I will usually take at least 3 to 5 miles of riding to get the engine warm enough to idle by itself without the choke. If your bike is a full operating temperature, it should idle at about 1000 RPM. If it's idling higher than this, you need to slow it down a bit.

Remove the air filter cover and look at the top right side of the carb. You'll see a screw there . This is the throttle stop screw. Turn the screw counterclockwise to lower the idle speed to 1000 RPM or so. Blip the throttle and let it settle back to idle. Reset it if necessary. Once set, put the air cleaner cover hand on.

This is typical. Whether you use the "enricher circuit" on a carburetor or the electronic injection system senses your engine is cold, your engine is being started with an extremely over rich mixture. Once the engine warms up and you either disengage the enricher or the engine temperature sensor senses the engine is warm, the mixture leans out. Still the idle mixture is overly rich but when running down the road, it should lean out to about a 13.5:1 mixture.

Try this, install a new set of plugs in your engine. Start the engine and ride a normal pace of about 50-60 mph for about ten miles. Then, pull in the clutch and hit the "Run/Stop" switch killing the engine instantly. Do not let it idle. Carefully pull off the road downshifting the transmission as you slow down. Do not downshift the transmission too quickly, Wait until the bike slows down to the proper speed before you shift. Once you've got the bike stopped, pull the plugs out of the engine and look at them. They should be a brown color indicating the proper mixture.

Good Luck
Steve

There is no reason for the idle to take 10-15 seconds to slow to normal. perhaps you have a vacume leak. check all your seal and gaskets between the engine and the carb.also when it is running spray gummout spray or equivilent around the gasket edges between the engine and the carb, if the idle increases when you spray then you have a vacume leak. (intake leak). It may be that this is causing it to be hard to start when it is hot.(not getting enough fuel)

If you bike is equipped with a carburetor, the idle stop screw is located at the top of the carb on the right side. Counterclockwise turn slows the idle speed.

If you bike is fuel injected, a dealer or shop will have to set the idle speed electronically.

Good Luck
Steve

I don't think there's anything wrong with your bike. I'm assuming that all the required services have been done and you have a good battery. The **9 bikes absolutely require a good strong battery. If you don't already have one get and use a battery tender. It will save you a lot of headaches with a weak battery. As for the starter speed, the 749 turns over S-L-O-W-L-Y. It's normal, if you're use to other makes it sounds like it won't start but it will. The Fast Idle lever, not a choke, once you start the bike, let it idle about 2000 RPM or so until the coolant temp gage stops flashing, then you can slowly back the lever to minimum, if you if you just push the lever back fast it drops the idle too fast and it will die. When it's not fully warm and you have a stock injection map it runs a little lean and will be cold blooded until fully warm. The occasional stall on a cold morning is not unusual even on a properly set up bike. I normally on cool mornings keep my fast Idle lever up until I'm either on a highway/freeway or a five or so miles in town before I turn it full off. She can be a real bitch to start if she's only a little warm, not cold/not hot, I really don't know why but mine does the same thing. I give it a minute and try again and she'll fire. All this goes away once she's fully warmed up. Once you get the knack of it you'll be fine, I don't even really have to think about it anymore.