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Re: 1998 artic cat 454 sputters and backfires when I let...
Could be a number of things
could be your ignition (possible) check your spark plugs for burnt out deposits
could be your carburation (more likely) check there are no air leaks or cracked inlet manifolds and your main jet is not worn
could be your exhaust (possible)
check your exhaust for any air leaks holes ect
also check your baffles are ok as exhaust get damp on the inside and rot from the inside
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Odds are it's the carb. Start with a clean air filter and box, check and make sure your plug is good. Pull the carb and disassemble and clean with carb cleaner. Blow it out with air, check all air passages. I summarized this of course. 90% of the time it will be crud in the carb.
A couple of suggestions: Make sure that the gasket seal is good between carb and engine. I had a similar problem with my Cat 500 and found that the choke was sticking. I sprayed down the carb with Gunk and made sure all moving parts were not hanging up. I also put anti fogging oil in the gas to help clean jets and ports hard to clean with a carb rebuild.
This sounds an awful lot like a safety switch issue. A lot of ATV's now have safety switches which need to be deactivated otherwise the safety switch sends a signal to the ECU telling it to impede or delay the timing. So on your model I believe you have to pull the clutch in before you attempt to start it. AND you have an emergency brake safety switch. The emergency break safety switch can be activated if the emergency brake lever has been removed or if the pivot point is heavily worn, or if the rigging is wrong. All of these things will cause the lever to contact the switch improperly. And so your ATV thinks the emergency break is on. Basically your ATV thinks you're crazy for trying to accelerate while the break is on so it impedes or delays the timing so you wont hurt the ATV or yourself. And that's why your getting a nice idle but backfiring and sputtering when you try to accelerate.
Hope this helps. Good Luck
well sounds like you need to clean air filter if that does not help i would go with your choke is sticking on if its a cable pull one make sure its pushing all the way back on carb check or if it is electronic one i would replace auto choke good luck
Sounds like your carb needs the fuel/air mix adjusted..uses all the gas at high speed but has excess at low speeds...find your adjusting screw and at med throttle slowly screw it clockwise until the engine starts to sputter then back it out until it starts to sputter again then continue to do this until you reach ideal mix where it runs the best it can..then go slowly through the throttle up and down..when set..unjust your idle speed screw to your ideal idle speed..if this dies not fix ..carb will bed cleaned or rebuilt. Good luck.. Note always push or pull your throttle handle slowly to position avoids gas load up causing sputter and backfire.
Inject some carb cleaner spray through the opened air filter while cranking. Spark plugs work? timing on the camshafts ok? Crank it without turning the throttle on. Pull the choke cable if you need to. It should fire up without throttle. Use the carb cleaner spray to help it (don't spray too much.It will backfire from the carbs).
Remove and clean the carbs. Clean the air filter and install new stock plugs. Re-mount the carbs and then balance and sync them. Now would also be a good time for a compression check. Valves and rings do give problems sometimes but these problems show up first as a lack of power. Since you didn't report a power problem I doubt if valves are the problem.