Massimo Buck 400 EFI Purchase
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By hisun junk
As I tried to do a conversion with the Yamaha 660 motor, I realized the 660 was never fuel injected so it would not work for the fuel injected hisun motor swap. But the good thing is the hisun 750 motor is a clone of the 660 Yamaha but with the components for the fuel injection (cam/crank position sensor). So that left me with a new rebuilt Yamaha 660 and still a broke 750 hisun motor. I took apart 750 think the timing chain had broke from all that I've heard about these motors. The chain was not broke, but just off cam and crank gears! The chain tensioner was at fault! I've ordered Yamaha 660 replacement parts, chain, two exhaust valves (which got bent when chain came off while motor was spinning) and seals. The piston has 2 little nicks where it had hit valves but no damage otherwise. The head is being redone at the machine shop and I'll be putting it back together in the next couple of weeks. Also I finally tracked down a Service Manual with all the info on the 550/750 Challenger.
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By TPlummer
We recently purchased the Axis x550. Fueled it with 93 fuel and drove one time around the farm and the 02 fault error appeared. Any ideas?
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By Mark Anderhalt
Question, Does anyone know if a 700-cylinder, piston, and head fit on top of a 500-bottom end, Although I have a 500 and have rebuilt the 500 once, I'm thinking the lower end may be the same for both the 500 and the 700. Does anyone have information on that?
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By felo72
Hello all. I purchased a brand new Massimo Buck 250 EFI in June for our farm and I've had the parking brake fail on me twice. I have approximately 250 miles on the vehicle. The first time was less than a month after receiving the UTV. We all of a sudden lost brake pressure and it would not start. I tracked the issue back to the parking brake. Upon removing the chain cover, I noticed the brake pad was missing and the caliper piston was touching the rotor. I found a set of brake pads online and replaced them myself. It's worked for several months and just happened again. Seems like a design flaw. I'm reaching out to see if there's an upgrade option available, or if I should replace the entire caliper with the brake pads? Thanks in advance for any advise.
I submitted a warranty claim, so I'll keep this updated with what Massimo replies.
When I replaced the brake pads the first time, back in July, my Son made a video on YouTube to show the unique caliper design. Here's a link if you wanted to check it out:
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