Ys 400
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By Jon V
Good afternoon. When the timing chain came off its lower gear (previous owner had over-tightened the tensioner), I ordered new parts.. chain, oil-pump chain, tensioner etc.. But now that it's time to put it back together, the main crankshaft makes a clang noise and stops when you turn it by hand. I want to solve this before assembling everything. The camshaft cover is off so that the valves aren't being activated. Should the transmission be in neutral to turn the crankshaft? The engine was running fine until the chain came off the lower gear. Then it would spin when the starter motor engaged so I assumed the crankshaft was spinning. Any advice is appreciated.
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By Goat Quilter
We pout new belts cleaned engine and carburetor plugs you name it. Drove down road no problem came back uphill no power won’t go . What’s the issue?
could it be clutch?
frustrated in shop more than in use on farm
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By weasel
starts up you have keep rpms up for 5 minutes till it warms up then runs fine. But if it stalls wont start unless you unplug fuel pump and hold it to the floor till it starts then plug pump back in and run it till it warms up then it is fine all day.
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By Bobby Courtney
I have a 2021 Coleman 400utv with 60 miles on it. I bought as project. It’s idled ruff and fouled plugs since it was new. I have removed and cleaned throttle body new injector new idle air valve new oxygen sensor. Installed ngk iridium plug. Starts and run good for about 5 or 6 miles and fouls plug. It runs rich all the time. I’ve done reset on ecu. I’m about to think it’s time to try a new ecu. Anyone please help.
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By camojay
When we first heard the noise, we immediately stopped driving it...at first we thought it might be a linkage issue, but after further inspection looks like the sound/jolting is coming from the rear diff. Took a video below...
Anyone know what is creating the diff to skip/jump like this? We drained the diff oil and didn't look terrible, no metal.
Other info that may be useful:
1400 miles on it
Recently tightened the E brake
P.s. never posted on this forum before, let me know if the video does not work
20240817_133539_1.mp4
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