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Massimo MSU500 ECU Flash


Clint Osborne

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    • By mac66
      I bought a used 2021 Axis 500 last April.  Low mileage and got it for considerably less than what they go for new.
      The first thing I did was change the oil/fluids and also put a new drive belt on it.  The only other thing I did to it was add a rear vinyl window that zips open and rolls up to keep the weather off.
      I used it on my 52 acre property to check trail cameras, service the food plots, haul fertilizer, seed etc etc. It's has a good size bed and is not too big or small.  It has worked well as a utility vehicle. 
      Other than using on the trails working around the property I haven't used it much off road...at least until last weekend when I went on 74 mile group ride around the county. In my state it's legal to ride on any road that's not a state or federal highway. The group started in town, rode about 30 miles on back roads to the state ORV trail system. Then did about 20 miles on the trails and then headed back via back roads to town.   
      It had rained for 2 days straight prior, so the trails were one mud hole after another.  It was very challenging.
      The good...
      -It worked fine, never had any kind of issue with it since I bought it.
      -It kept up with more expensive machines on the trails. I was the only one with a CCC (Cheap Chinese Crap) machine.
      -Fairly comfortable to drive.
      -The roof, windshield and rear window kept most of the rain off when it started raining in the afternoon.
      -Okay, I cheated. I peeled off the AXIS 500 stickers on each side. Everybody in the group assumed I had a Rhino. They didn't ask, I didn't tell.
      The not so good...
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      -It is LOUD! Had to wear shooting earmuffs to keep my ears from ringing while riding. Going to have to address that.
      Overall Impression...
      I was impressed with it on the trails, and it is a good utility vehicle for working around the property. Considering what I paid for it I am very happy with its performance.
    • By Hunterman22
      2021 Hisun Axis 500 UTV (From Lowes)
      Will NOT START
      MY apologies if this is to much info just wanted to give yal the most information possible for help.
      I'm a so called diyer. An Electrician by trade 21yrs. I got my S×S from my last job. The contractor purchased this S×S for this specific job brand new, from Lowes. They used it for hauling materials, tools, & a little bit of anything you can think of on an Industrial type job site. 
      I remember getting on the SxS one time & pushed the gas petal all the way to the floor & SxS had very little power. 
      So anyway ,when the job finished up back mid July this year (7/2024) , I asked the contractor what they was going to do with it. I was told to take it. Otherwise it would go to the contractors yard (storage yard) & most likely rust away. 
      Took it home washed it , it had a heavy coat of dust on it & in it dust was every where. My helper & I had to push it on the trailer to get it home.  After washing it throughly I let it sit & dry out for a good day and half, maybe 2 days. Before trying to start it. NO START. Will turn over & try to start but thats it. 
      So here's what I've purchased & installed. New Air Filter, new spark plug, new air idle control valve (AICV), new throttle position sensor, new throttle body, new oxygen sensor, new digital dash speedometer/fuel gauge/clock. 
      Also drained the old oil & gas & replaced with new oil & 93oct. gas. I should probably mention that I've changed the AICV twice. The 1st time I changed the AICV I was able to get the SxS started & let idle for at least 10-15min. Drove out of the garage, with very little power,  turned it around & barely got it back in the garage.That was the one & only time I've been able to start the SxS. I've also cleaned the Throttle Body and & intake with TB cleaner.  So after that the AICV was  making weird noise so I pulled it out & tried cleaning it, pretty sure I messed it up. So I purchased a Throttle Body that came with new AICV & TPS. Still NO START.  I've checked the fuel pump & the fuel injector.  I took the injector off still hooked up to wiring & turned the key over, the injector sprayed a lot of gas out kinda the size of a volleyball. I've also checked the clearance gap on the intake & exhaust valve. But today 11/2/2024 I'm going recheck spark plug gap & the valve gaps. And alot of other checking. Would the driver side seat belt have anything to do with it not starting?? I know the driver side seat belt has to be in gauged for full throttle "going fast". Thing is the drv. side seat belt will latch but feels like might be messed up inside of it. Tired opening it up but to no avail.  I've never had a S×S or 4wheeler so I was really excited when I got the S×S,not so much anymore.  I work on & fix my own vehicles usually no problems.  But this SxS is kicking my ass.
      So if possible & someone could help me with some ideas or tell me what Im doing wrong or did wrong, I would greatly appreciate it.  Thank you for reading thus far.
       
       
    • 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.
       
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      Ya be good and stay warm over the next few months 
       
      Kilgore.
    • By Josh5696
      So I've got a 2022 Axis 500 UTV with only 50 miles on the odometer. It seems to have a strange grinding/squeeling noise coming from the clutch when decelerating or going down hill at lower speeds. Did some research, and found out this is apparently a fairly common thing. Alot of sources suggest the one way bearing is responsible. I'm hearing about quite a few horror stories about these bearings going bad on practically new machines, and when they replace the bearing it goes bad again shortly after.
      Has anyone come up with a solid fix for this? I've read it may be possible to run the UTV without the bearing at all, is that true? Are the $20 replacement bearings from eBay and Amazon complete garbage, and is there a better one way bearing out there that's built stronger? Is there something else causing this bearing to wear out faster, or is the stock bearing complete junk?
      Any input is appreciated, thanks in advance!
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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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