2003 LTZ 400 Problem
I recently bought a 2003 LTZ 400. The guy I purchased it from was a real prick.. He made it sound like this quad was in mint condition, barely used, mostly collected dust sitting in his garage. So after an hour and a half of driving to go get this quad its a bit beat up, but anyway... I am having trouble keeping this thing running. There are no real mods to it other than the intake snorkal baffle thing being removed, the exhaust baffle out, and the fuel screw turned to 3 turns out.
This is whats happening:
I turn the choke on and crank over the motor.. after about 5 seconds or so of cranking (long time to have to get an engine started) it'll finally start up (Won't start up at all without the choke), but it wont stay running for long. You'll hear when it starts that the idle isn't really going crazy, but its kind of dropping and raising about 100rpms which is usually normal for when the choke is on. But after about 10 seconds or so of running, the engine will rev down a little bit (about 400rpms) and then the motor stalls and there is this like "BANG!" sound come from the motor, as if the engine slammed to a hault..
This only really happens when it's idling. If I start it up and take off right away, i'll get going, but the quad will bog down a little bit as i am driving and when i let off the gas it'll pop like crazy. And once I get back down in the revs towards idle the engine stalls and makes that "BANG!" noise again. I thought maybe the carb was clogged up, so I cleaned it. I also drained the tank and refilled with premium 93 octane, haven't changed the oil yet because i am waiting on my oil filter to come in the mail along with some other parts to make it look a little better cosmetically. I also just changed the spark plug today, I pulled out the CR7E spark plug that was in there and it was completely black and looked as if it had never been replaced before. I replaced the CR7E with a CR8E since the auto parts store was out of 7s.
The previous owner of this quad was a real moron.. He hard wired the radiator fan so it would always be on, and he cut the temperature sensor light in the process because he was too much of an idiot to test which wire coming from the radiator was for the fan, and which one was for the temperature.. anyway, those are both fixed now, but i'm really concerned about the way this thing is acting. I'm going to do a coolant flush soon, I have a container of engine ice, I just need to get some distilled water to flush out the cooling system with.
Sorry for writing all you guys a novel on here lol, hope someone can help me with this problem....