Bike was running great a few days ago. Now its very hard to start and I have to pin the throttle to start it now. Once i start it it runs great at low speeds as well as high but it wont idle unless i turn up the idler and then when i shut it down its still hard to start even when its warm. I changed the spark plug and checked the compression everything seems fine. I know nothing about valves but everything looks and feels tight?????
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first drain the carby, then set your air mixture screw 2 turns out, from the fully turned in position. The starting proceedure is as follows, when the engine is COLD, turn on fuel, pull on the choke fully, and kick the engine over. DO NOT use any throttle, when the engine is cold, and the choke is on. Remember Choke on, NO throttle. When warm, no choke, and a little throttle when kicking.
Even though you probably don't have that many miles on the bike, or if you do have a lot riding time on it, it sounds to me like you need a valve adjustment. That's a high reving bike for that engine that works pretty hard so you might have 1 - 3 loose valves.
YOUR BIKE HAS A POWER VALVE (DIAPHRAM FUEL PUMP) THAT GIVES A SHOT OF GAS EACH TIME THE THROTTLE IS TWISTED. WHEN THE BIKE IS HOT, IT FLOODS EASILY. DON'T HIT THE THROTTLE WHEN STARTING THE BIKE WHEN THE ENGINE IS HOT.