2022 Hisun 750 flash ECU
I have a Coleman 550 (hisun). Wouldnt start and was sucking instead of blowing through the spark plug hole. Got to the timing chain and it was very loose and for sure the timing was way off. Got the tensioner off and set it to TDC and got the cam gear back aligned. Put the chain back on and set the tensioner as instructed and the chain is still very loose. I extended the tensioner as far as it would go to test and the chain is still loose.
Any ideas what could be broken or wrong? Why would the chain be so loose?
By Working hard to hardly work
Hey guys im in the process of rebuilding my massimo 500, and like a dummy I did not mark the cam. Im having a harder time finding timing info than i thought. Can anyone give me a no bs way to where and how i need to align the crank and cams to time this thing? Im still trying to learn how to properly time motors so any dumming down would be appreciated.
By hisun junk
I have a 2018 cub cadet challenger 750 with a broke chinese hisun motor and I know that I'm not alone! Almost all the places that were selling them in Colorado don't anymore due to the return for repairs on the clutches and broken timing chains! Don't have yours fixed because it will happen again! They just replace the broken parts with more junk chinese parts! I talked with a UTV mechanic that has replaced one person's clutch 4 times! I have people contacting cub cadet about these problems and also looking into complete motor replacement from hisun junk to a Japanese motor in which the chinese cloned their junk from.
Had to replace the camshaft and exhaust valve rocker arm due to abnormal wear. The cam lobe was ground nearly completely off!
Now I have a no start.
The only service manual I've been able to find for this is the HS 500-700 edition. This manual shows a split head with 5 valves. Mine is 2 valves with a machined 1 piece head. The HS400 head looks the same. The problem is that neither of these give an accurate description of how to set up the timing after a cam replacement.
I watched the video that is posted on this site but that is for the split (2 piece) head.
I have attached a picture of how I lined up the timing marks. What have I done wrong?
Timing gear, all marks to top. Crank (thru armature peep hole) is there. 3rd line, top center but it doesn't sound like I have decompression.
In fact, my go round put me at least 2, maybe 3 links off (early) and I actually thought it was going to run. I could hear the motor pop but wouldn't fire and run. After I readjusted the chain I get no indication of any fire and sounds like no decompresion. ??
I was looking at purchasing a 2017 Hisun vector 500, used of course. The seller is selling it cheap stating the machine had "an unknown oil leak" and his kids ran it low on oil causing the timing chain to brake. I am not familiar with small engines, but with what is being described, wouldn't this result in some damage to other internal components as well? Just trying to get an idea if the machine is worth fixing or would it likely need a complete engine/overhaul to make it right before I entertain the thought of purchasing it.
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