Greg Kilgore

This may work. Works for my Axis which is made by hisun just like the Massimo. Begin with the machine off. Cycle the key on and off 5 times within 5 -10 seconds. Making sure the fuel pump kicks on each time. After the 5th key off. Wait 30 seconds then start. Should be reset.

What is a 850-5? Brand? Year?

Don't know about the ranger. But when I changed the belt on my cfmoto. Once everything was back together I had to spin the secondary sheave backwards 4 or 5 turns. To tighten the belt on the sheaves. When the belt went out it shredded and bits of cord and rubber was in the primary sheave. Had to clean that out. Also use a green sos pad to scuff up the sheaves. That's all I got. Best of luck and keep us posted on the progress.

What scanner? Model number. Did you have to buy or make an adapter cable. There are just a few scanners that can read and reset the computer. The ECU should be a Delphi MT05. Try the procedure above. It's free, easy, at at least you can say "I told you it wouldn't work." So at 3100RPM in neutral and in Hi range (2-wheel or 4-wheel) and Lo range (2-wheel or 4-wheel) it will surges. If it does it in neutral, then it shouldn't be anything speed related. It would should be something with a sensor that controls the RPM to keep excessive from hurting the engine. Will it go above the 3100 RPM? Or cutting out at 3100 like it's hitting a Rev Limiter?

Joseph, A few questions. 1. What is the "certain" RPM? 2. What speed? 3 What range is the drive selector? Meaning "High", "Low", or "Reverse"? 4. Does it do it with drive selector in "Neutral"? 5. 2 or 4 wheel drive? Have you tested/inspected the speed sending unit on the rear differential and gear oil? See pic. Do NOT just try and remove the sensor. The wires will just twist and brake. There is a connection on the wires coming from the sensor about 5-7 inches from where is screws into the differential. Disconnect the wire and turn the sensor and wires as one unit.

Did you or shop reset the computer after changing parts? Kinda simple. Look here for a lot of good information on these and other engines. https://chinariders.net/showthread.php?t=15675 Look at post #5 "Rebooting the ECU Perform the following steps to reboot the ECU. 1. Turn off the ignition for 15 seconds. 2. Turn the ignition on/off for 5 cycles. Make sure each cycle lasts about ½ second, verifying the start of the fuel pump for each cycle. If the fuel pump doesn't start during any cycle, begin the entire reboot procedure from the beginning. 3. Turn off the ignition for 15 seconds. __________________ Spud" The Motorcycle Doctor has another procedure for resetting the ECU but I think the above procedure is safer.

Where is this speed limiter? Pic?

😂 maybe somebody put "excellence" in the tank. Ricky Bobby wasn't hunting with you was he?

Started at the top and read the entire thread again. Sounds like a "buddy" didn't want competition at deer camp and knew how to mess with your mind. That's dirty.

That would do it. Years, years ago. Girl friends 5 year old was playing in his sand box. Filled the tank to a kerosene heater with sand. Well at least you got to the bottom of it.

Just for giggles have you changed the fuel filter. There is a screen in the injector also. Don't know if it is serviceable. So may have to change the entire injector. Had similar issues out of my Axis 500. Would not idle. Had to keep foot on gas at all times. Changed the fuel filter and that corrected the problem. Actually it looked like oem painted the inside nipples of fuel filter and it started flaking off

Unfortunately withe the seat sliders and the way the cushions is angled. I don't think it sits any lower. Even with the new flat base plate. I guess I could cut the frame of the RZR seat. Then attach the bottom cushion directly to the slide. Then use a piece of "L" bracket to attach the backrest directly to the slide. But don't want to hack up a good frame. Just sounds like too much work for little reward.

Well finally got the driver's side seat so wife will be able to slide seat forward. Couldn't find my jigsaw metal blades, so had to use the wood blade I had installed in jigsaw. Wasted a lot of time looking for metal blades. Was only able to get the driver's side done. But I have the seat to put in passenger side. I got a new-to-me set of RZR seats off eBay. Then a set of seat sliders off eBay. I used the existing seat base and made a new one out of a piece of 1/16 metal I had laying around. (Old data cabinet side panel) then took the latch off the old seat base and put on new metal base. The only issue is I need to make the rear "fingers" a little thicker. The rear of the base has a little play when seat is empty. But not enough to cause any issue when riding. Also may need a few washers between the base plate and latch. When the seat is installed. The latch keeps the plate from setting all the way down. But I just pull up on the latch and let it side down a little lower on the locking post. Not to mention the harness will keep you in the seat. Got the harnesses off Amazon. Below are pics. Before. After. New seat all the way back. The slide slid all the way forward. Pic of lock Here is the seat sliders.

How old is the machine. Got a pic of gauge? Did gauge work at one point in time? Maybe this could help.

May be easier to get 2 more rims and turf tires.

To keep from replacing spark plugs. Soak in regular gas overnight and a good stiff brush to clean off the carbon for the next use. Carbon buildup can come from rich gas/air mixture like you said. But can also be a leaking fuel injector, weak coil spark, or bad spark plug wire. You can get a spark tester or make one. On one end has a tip where you plug in the spark plug wire. The other end has alligator clip that clips to engine block. It has an adjustable pointer so the gap can be adjusted. That way you can tell how far of a gap the spark will jump. About $15 at auto parts. I use this all the time for outboards. To see how strong a spark is. Should have a good blue spark. Red or yellow spark means weak spark. And jump a 7/16 to 1/2 inch gap with ease. Reason for jumping such a large air gap. It takes more voltage to jump a gap under pressure. Like the pressure in the combustion chamber of the cylinder than in the open air. And since we are testing the gap in open air. The distance has to increase. If not then maybe the spark plug wire has too high resistance or the coil is giving a weak spark. And the coil should be covered under warranty. To check the fuel injector. Turn key on, wait for fuel pump to kick off. Then wait to see if it kicks back on. I don't think the fuel pump should kick on unless the fuel system is loosing pressure. It's a closed system and unless you see a fuel leak. It would have to be the injector leaking or pump. And if pump leaking off wouldn't cause excess fuel in combustion chamber causing carbon buildup on spark plug. Should be able to find an injector or coil on Amazon for $35ish. But injector should be covered under warranty also. I order replacement parts off Amazon and had my machine (Axis) fixed before the mobile tech contacted me. 2 weeks after I fixed it mobile tech called and told me he'd order parts. I'm still waiting on the replacement parts. Just want to have them incase the drive shaft goes out again. Hope this helps some to point you in the right direction to resolve you problem.

NewtoUTV, as Bryan g said above. He runs a service center and has had new machines come in with air filter installed backwards. If the air filter was installed backwards that may make the machine hard to start and use more fuel or give a rich fuel/air mix and cause carbon build-up on plug. Doesn't hurt to check. Maybe need to clean air filter.

Lou, read this. Notice the mileage and the tank wasn't completely full. Just enough to read full. Fuel icon is lit just to be lit i guess. If it is low it will flash.

By fuel mix are you referring to fuel:air mix OR are you mixing gas and 2-cycle oil and pouring into the tank? I'm not familiar with the Coleman UT400 but, I'm 99% sure the fuel should not be a gas:oil mix. Like a 2-cycle engine. 99% sure the engine is 4-cycle. Even though it's a single cylinder. If using straight gas and still getting a lot of carbon build-up. Try a different grade/brand of gas. Maybe some fuel cleaner. Around here we have 1 station that sells REC gas. It's 90 octane and doesn't have ethanol.

Aefron88, I am wondering the same thing. Since there is not a U-joint. The drive shaft goes straight from the engine to the rear differential. There is a 1" square tube cage/frame(?) built around the engine and differential. That shouldn't bend or flex. To take the drive shaft out. Either the engine has to be moved forward or the differential has to move back. I didn't find any loose or missing bolts on the engine side or the differential side. The way the splines on the drive shaft sit in the cups. They go in about 2" and bottom out. I should have measured the length of the old drive shaft and the new one I put in. To see if there was a difference. I still haven't received the drive shaft the mobile tech was supposed to have ordered. And he hasn't followed up when he said he would inquire about it being on back order. The one I installed from Amazon fit perfectly and I have the machine back operational. Just wanting the parts in the off chance it happens again. As I said I was going up a dirt/gravel road that a dozer had made wash board type depressions with its tracks. Was moving about 20MPH with me and the wife. I'm a good 280lb. Wife well let's just say petite husky 😂 and say there was 400 to 430 lbs in the cab. The frame shouldn't have flexed but may have and with the torque of trying to haul our big behinds up the hill of wash board tread tracks. May have flexed enough to cause the splines to slip. I still have the old parts. I may try to do some kind of hardness test. Could try to "X" the side of the frame to reinforce just incase the frame did flex. Would have to take to a weld shop to get that done. I've got a Flux wire mig welder, but no where near enough experience to weld something like that. I'd have to nut and bolt it together. But that would definitely cause a weak spots. Just like the number of licks it takes to get to the center of a tootsie pop. The world may never know. The reason the splines stripped the way they did.

Well on 12/15 or so, I received a package from HiSun. Got the seal and engine cup for the axle and the rear cup that the parking brake rotor attaches to. But not the axle itself. Sent the mobile tech a text message inquiring about missing parts. Reply was he would contact hisun to see it they were on back order. Nothing since. I'll keep ya posted when I receive all parts.

Found this service manual. on page 8-14 has this diagram of starting circuit. From the diagram. The key switch gets power from the fuse in the starter solenoid. Then key switch sends power thru a fuse to a brake switch. Thru a safety switch back to the starter solenoid. To engage the starter. So the key switch gets power thru the solenoid fuse. Main 12V+ goes to stud on relay. Then thru fuse. Then to wire going to keyswitch. When you replaced the solenoid. Make sure the main battery cable connected to the stud that provides power to the fuse. Hope this helps.

Sounds like there is a fuse going to the key switch that is blown. And by crossing the wires, you are back-feeding power to key switch and ignition system. Remove wire and remove power from ignition system and the machine shuts down. Check for an actual fuse box or loose wire somewhere.

So have to push it while in neutral THEN while it's rolling, slam it into gear. That is not good on the transmission. Even when the engine is running, the clutch should not be engaged until there is higher RPM. Then the engine spins the clutch, the paws on the clutch slings out and engages the clutch drum. The drum spins the primary sheave. Primary sheave spins the cvt belt. Cvt belt spins the secondary sheave. Secondary sheave is on a shaft attached to transmission. Now the clutch is a wet clutch. It uses a special engine oil for wet clutch motorcycle, ATVs and such. Is it possible it has the wrong oil? Possible air filter? Possible fuel filter? Since it doesn't happen all the time it will be hard to test. Maybe the next time it happens. Jack up the machine so wheels are off the ground. Start again and put in gear. See if it stalls again. I just don't know enough to help. Sorry.

Here is the post about the shift issue.