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Timing guides and chain

So I picked up a 1998 Polaris sportsman 500 and it hasn’t ran in a while so I bought a new carb and new spark plug and all it would do was backfire out of the carb so I new the timing was off well upon pulling the cover off of the motor the chain is loose so i felt the timing guide and on he left side of the head closest to the carb and it has side to side movement is this normal and the tensioner has been rigged in the past with a nut welded on the end my first Polaris and could use some help thanks in advance I will try to get a pic of the chain tomorrow




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Electrical help

Picked up a 94 or 95 Explorer 400L for cheap. Battery was hooked up reverse polarity, barely got it to run no power won't idle. Now couldn't start at all. What electrical parts have been fried? Any help appreciated I'm not wanting to take it to a shop if I can help it. Thanks, Mike
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Belt upgrade

Ok i don’t know which belt I need to upgrade on my 570 xmr. Iv seen the heavy duty belt for 120ish for the defender and the Maverick turbo belt for 170ish. Are these both options or am I not looking at the right belts
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gros jet

What ever happened to the gros jet? [sp]
You know the little ball and seat that replaced the needle and seat?
We thought they were ''the cats meow'' in the 60s. I sure could have used a couple a while back. lol.
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2001 sportsman 90 harsh banging and slipping from trans

I have a 01 sportsman 90 that under a load I get a slipping sensation and a loud bang noise. It sounds and feels like the chain is skipping but it is not I think a gear or something in the trans is slipping. Has anyone have had this problem before? I don’t think it’s the belt because it bangs hard and is loud.
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2010 XP 550 throttle grabs

My 2010 Sportsman XL 550 EPS doesn't gradually engage when throttling up now like it used to. It waits until the RPMs are fairly high and then grabs and jumps forward or backward depending what you have the shifter selected to. I can't ease it forward or backward anymore like I used to. The belt is still the original one that came on it and the ATV has about 1200 miles on it. Any ideas?