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That gear shouldn't be sticking out, when you put Greece in your driveshaft it will expand, but I got a hisun sector 550 that was put together wrong from factory. Mine had a spring behind the nut in the differential, only way to know is remove driveshaft and look at that gear, and make sure they didn't add a spring behind your nut, it will keep that gear from going all the way in. That's probably about the same amount of miles on mine before it happened to me, here's picture of bad parts, don't put the spring behind the nut if yours has one behind it.

Got mine from 3 star industries. Fits perfect. Easy installation. Bob

2014 uxv700i will not start, has fire, checked all sensors voltages, resistances etc, NO codes showing. Compression 90, manual says 213, checked valve lash, did not make a difference When i turn crankshaft this is what I am seeing, with inspection covers off top. Exhaust valves open then shut, intake valves open then shut , turn it just a tad more and loud snap, click ? on exhaust valves, i can feel this. even if timing jumped and i bring to TDC and redo valve lash i should see a correction, but this is not happening any input greatly !!! appreciated. Thank you all

Well, i got some feedback from another forum member. First the clank or snap in exhaust valves is a built in decompression on camshaft Second per input from member I took off valve cover, brought flywheel to timing mark, checked camshaft and hash marks, they did not line up horizontally, appears that engine jumped timing. Will reset and confirm tomorrow thanks all