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Challenger 750 - junk hisun motors!


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  • 2 weeks later...

We found that bypassing the thermal switch on radiator to make fan run continuously when key is on, ended the overheating.....of course  thats after we replaced the head gasket, then the warped burnt  head and  gasket again.. in beginning on hot day, it would overheat in 1-2 miles.... We tested their settings for switch. The fan engaged at 238 degrees if I remember correctly .. and the switch is on the COLD  side!!!  how hot was the engine ??? 250* -260*??  The heat in the cab was unbearable, I would be drenched in sweat in minutes.   .. now with a new adjustable switch and engine staying 150*-160* , the cab is pleasant..  I would also Check yours to see if head gasket is fried. look for air bubbles in recovery bottle while idling hot.  and / or water in oil. 

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Just an fyi

Ive worked on a few hisuns biggest issue with 700 750 is that when the engine was installed it was installed at the wrong angle and when going uphill it runs low on oil. Add 1 liter or quart of oil from full and re mark the dip stick.

This will solve a lot of issues especially with timing chain and wet clutch.

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What your saying is true in some cases like very small 4 stroke, however the hisun has a built in windage tray for the crank, no spash.

Also due to the icreased volume of the case, it has a transmission built in, excess crank pressure isnt really an issue.

Either way avoiding catastrophic engine failure due to lack of oil is the key here.

Also i was incorrect it starves when going steep downhill not up.

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  • 1 year later...

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