Martin,there are so many ATV's out there, it's impossible to know if your model had a inline fuel filter on it when it came from the factory. If it's like most motorcycles(which an ATV engine really is), the factory probably only relied on the "sock filter" that's attached permanently onto the fuel petcock that goes up into the fuel tank, and it's something you don't see or think about until you have carburator and fuel issues. It's ALWAYS good insurance to have an auxillary inline fuel filter that you can positively see, and positively know, it's filtering the fuel before troubles arise. Nothing wrong with the factory petcock "sock filters". They do a good job of filtering down to probably 20 microns or a little more of crud. BUT, when crud can be only 5 microns, isn't it good to also know you have a inline fuel filter that can filter that smaller crud out before it gets to your carburator? These motorcycle filters are heavy plastic, but "glass clear" in appearance to let you know they're filtering properly with crud sticking onto the filter innards or you see things floating around in them, and cost is less than $5.00 and I would also recommend asking the motorcycle shop for some little "spring wire hose clamps". The ATV's carburators work by "gravity feed" and ARE NOT under any pressure at all. NOW, if you have an ATV that's fuel injected, DON'T cut your fuel line as it's under pressure from a fuel pump(probably submerged in fuel tank) and you'll rupture a regular fuel filter and possibly catch your ATV on fire. These require special fuel filters and special designed fuel lines.
As to how your ATV runs, when you say it's blurping and acts like hitting rev limiter(but you know you aren't)that's a sign that one or both of your carburator jets is already clogged with crud and carburator needs to be removed and cleaned out thouroughly. If your careful about disassembly of carb, you can probably save the gaskets and reuse them without getting a new carburator rebuild kit. There's not but a couple gaskets and other items to these carbs, but you need to be watchful, as some items only go on "one way". When I recently bought my '98 Yamaha Big Bear, I was having same problem and I disassembled and cleaned my carb(used old gaskets) and reassembled and ATV worked perfect. My problem was with OLD GAS as it sat for too long(6 months). When this happens the gas will evaporate and can leave the jets clogged, dirty flaky crud in carburator bowl, and possibility that float needle won't seal and you have fuel running out the carb's overflow tube. Now what I do, is when I put in more fuel into my ATV, I'll also put in some "STABIL" fuel treatment. This way the fuel won't go stale from non usage. If you're not comfortable with carburators, just find someone who is(neighbor, friend, family member)and they'll know what to do and how to do it with rebuilding for the least amount of money. If you have Dealership rebuild carb, they'll want you to bring in ATV and they might keep it for 3 weeks, for what should only take a couple hours--and charge you $500 or more. Good Luck and keep us informed.
Del
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