Random thread fo sho but I really only post in this section so I decided to go for it. Anyways, I've got a 2001(I think, bought it new but never really rode it) Yamaha Big Bear 400 4x4 ATV that I've had sitting for quite sometime and need some help with. It sat with gas still in the tank in storage for a year or more without being as much as started(whoops) and now I get to pay for it. I got it out today and drained the gas out of the tank and pulled the carb off. Figuring the jets and everything would be gummed up pretty bad but to my surprise they wasn't. Everything was super clean inside and I went ahead and cleaned the bowl/jets with cleaner and made sure everything was clean/clear of any debris before putting it back together. Went ahead and installed a new spark plug and filled it up with a new tank of gas.
It needs a new battery from where it's been sitting but I used the battery charger and started it up this evening. My issue is that it seems really rich throughout the entire rev range. Everything on the atv is factory stock and never been messed with so I know the idle mixture screw/jets haven't been messed with to cause any issues such as this. The air filter is nice and everything else checks out. The Idle Speed screw has been turned and messed with so I need a "Diagnostic Tachometer" to hook up to it so I can correctly set the idle rpm, but that's pretty minor compared to my current issue. One thing I did notice is that the choke seems to have no effect on it. If it's sitting and idling and you pulled the choke out to "fully on"(...I guess that's how you say it...I know nothing about carbs, lol) shouldn't it cause it to go rich or something? It has zero effect, almost like it's stuck on at all times and that's what's causing my issues. Anyone have any opinions on the ordeal? At least could someone point me to a good forum to ask on? I can provide pics/vids to help with the issue. Thanks in advance!!!
-Dave
It needs a new battery from where it's been sitting but I used the battery charger and started it up this evening. My issue is that it seems really rich throughout the entire rev range. Everything on the atv is factory stock and never been messed with so I know the idle mixture screw/jets haven't been messed with to cause any issues such as this. The air filter is nice and everything else checks out. The Idle Speed screw has been turned and messed with so I need a "Diagnostic Tachometer" to hook up to it so I can correctly set the idle rpm, but that's pretty minor compared to my current issue. One thing I did notice is that the choke seems to have no effect on it. If it's sitting and idling and you pulled the choke out to "fully on"(...I guess that's how you say it...I know nothing about carbs, lol) shouldn't it cause it to go rich or something? It has zero effect, almost like it's stuck on at all times and that's what's causing my issues. Anyone have any opinions on the ordeal? At least could someone point me to a good forum to ask on? I can provide pics/vids to help with the issue. Thanks in advance!!!
-Dave
