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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 rev6engines
Black Friday is here, and we’re excited to give our offroad family 20% off on all parts and kits! Whether you're prepping for new trails or just fine-tuning your rig, we've got what you need to keep rolling. Now Is also a great time to upgrade your sled, winter's coming fast!
If you have any questions or need help finding the right part, feel free to call, text, or email us. We’re here for you!
Call or Text:
801) 489-8697
Email at:
[email protected]
Happy riding!!! 🤘
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By Will Sutton
I've got a 2023 UT400 (bought from tractor supply) and I've been beating my head against a wall with it.
It will start and idle perfectly. The second I touch the throttle it sputters and dies.
I've checked that the fuel pump is working (it is).
I've replaced the injector, throttle position sensor, O2 sensor, and intake air sensor. All with no change.
I've just taken a look a the schematic, and there is a crank position sensor as well.
Could this be the source of my troubles? If so, where is this thing located? I can't seem to find it on any drawings from the parts suppliers.
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By Greg Kilgore
Last year bought a small universal coolant style cab heater. Well I installed it today. Thanks to another member, RangeRider45, and his install
That told in his post the size fitting he used. I got the same fittings plus a few others. And all went kinda smooth. Took a few minutes to get air purged from coolant system. Should have parked on hill with front up in the air. But would have had a hard time working on it.
I had a variable power switch connected to an overhead cab fan. Never really used the fan that much. And I have to remove the fan to put on my cab enclosure anyway. So I repurposed the switch to supply power for the heater. The heater has 2 12-volt DC computer fans that are rated for 1.8 amps each. So it's not going to be a big drain on the weak charging system. And with the switch I've got great control over the speed of the fans.
If anyone is interested the radiator hoses are 7/8 inch. I reworked the temperature sending unit (moved it closer to radiator) to make room for all the extra plumbing I did to get the heater to work the way I wanted.
Plumbing parts list.
10-15 worm water clamps. 3/4 to 1 1/4 inch size.
2 1" x 3/4" x 1" PEX Tee
1 3/4" PEX ball valve
1 1" PEX ball valve
5/8" heater hose. I got 6' and probably have 4' left over.
I used the radiator house I cut out to use as splices between the PEX fittings. The PEX fittings are not true to their dimensions that are stated on the package. So they fit the 5/8" and 7/8" very nicely.
They way I have it plumbed is from radiation out side. A tee, then the 1" ball valve, then a Tee. Coming off the Tees are the hoses going to the heater core. There is a 3/4" ball valve on one of the Tees. The ball valves are used to bypass the heater core in the summer. Or direct the hot coolant through the heater core in winter. The temperature sending unit tells me how hot the coolant is. And if anything is getting too hot. The dash also has an idiot light that comes on if the head gets too hot. But doesn't do anything if the radiator gets too hot. There is a temp sensor on the radiator that controls the electrical fan. But if the coolant isn't circulating. That switch never sends a signal to turn on the fan. But enough talking/rambling. Everyone wants to see pics. The only thing I need to change is the orientation of the handle on the 1" ball valve. I have 2" or more clearance between the handle and the tire when cut hard right. But I still don't like it. And instead of taking the valve out and rotating 180°. I'm just going to take the nut off and rotate the handle 180°. Think I need to make a locking mechanism to lock the handles in place so they don't vibrate closed when the machine is moving.
The temperature sending unit and housing. Size 22 mm. Aluminum from Amazon.
Upper Tee the lower Tee is identical. Can also see the handle of the 3/4" ball valve on the 5/8" hose going to the heater.
The 1" ball valve. Goes between the 2 Tees
Wide view of the plumbing.
The heater installed in the sxs. The 3 black hoses are just hanging there. Zip ties to the heater but not attached to any thing. Will probably just direct 2 toward the wife's feet. And 1 toward mine. Or what ever is need as the heat is needed on rides. The black hose in passenger floorboard is some 1" hose that is not needed. Don't know what I'll do with it.
I think if I was going to do it again. I'd put some Indian Head gasket dressing or silicone on the 1" side of the PEX fittings. And I may still do that. But I really hate the ideal of introducing air back in the coolant system.
Any questions just ask. It may take a while to answer. But I'll try.
Ya be good and stay warm over the next few months
Kilgore.
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