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I only had mine 12 days before the motor blew and they refuse to fix it. I will need to find a new motor and don’t want to mess with a hisun motor as they are obviously a waste of money(they want $7k to replace). any advice on where to find parts or what is interchangeable would be much appreciated.

Well I finally got back to work on my junk hisun Challenger 750 UTV. I purchased what I thought and asked for a fuel injected 660 Yamaha motor out of a rhino or grizzly. The salvage place said they had one and would have it rebuilt for me. (the only way they sell their motors) The problem is hisun cloned the 660 Yamaha increased the bore & stroke to 102mm x 90mm from 100mm x 84mm. Identical motors, but the Yamaha was never fuel injected I found out when I went to install it. The place I purchased the motor said it was, I requested that it be a fuel injected motor and again the salesman had said it was. The 660 Yamaha was produced from '02-'08 but only with a carburetor. So no crank position sensor for fuel injection to work. So now I've tore apart the hisun junk motor and found that the cam/timing chain had come off the gears. It either stretched or the tensioner failed. The piston hit both exhaust valves and bent them. Dropped the head of at the machine shop yesterday for new valves and clean it up having them check the three intake valves plus all the spring pressures. The replacement vales and springs will be Yamaha as needed. The cam/timing and tensioner will be replaced with Yamaha parts as well. The piston and bore looks good with only two little nicks where valves hit. The Motorcycle Doctor in Florida is a hisun junk dealer and has parts for sale on eBay or direct at 573-346-6867 or motorcycledoctor.com. I would suggest taking the time and use Yamaha parts when you can. As you can see from pictures below the hisun has a different intake port compared to the Yamaha 660. That's what got me started into checking out the 660 motor not being fuel injected. I get the head back in a 1.5 weeks, timing chain and tensioner is ordered, then I'll put it all back together and do another post. Also if anyone needs a rebuilt Yamaha 660 for a rhino or grizzly '02-'08 let me know $2,750.00 shipping included.

Dont recall the name of it.. I just Googled UTV engine rebuilders ..Picked one, I emailed the Owner.. he said he was 99% sure one of his YAMAHA rebuilts would bolt up where my HISUN is now.. The Hisun is a Yamaha CLONE.. .. He also said it for any reason it did not, he would take it back.. He also had free shipping .. If mine fails again, I will likely go that route . Currently mine is still running