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I really appreciate you letting me know about Massimo not honoring their warranty. I will check out the Aodes UTVs. I will say, I never heard of Aodes so again thank you for sharing this information.

I seldom have a reason to go over 20 to 25 mph but I think it is capable if I wanted to. I think the 550 tops out around 40 to 45 in high, but I haven't really tried that. Most of my property is on hillsides so I only use low range, it has plenty of speed for the 1/8 mile trip down our dirt road to my barn. It does get a little loud even at 20-25 mph, but not alarmingly so. Its just the engine revs. It should be smooth. Can you tell if this is exhaust noise or is it noise from something internal to the engine or trans. Maybe remove the dump bed and have a buddy listen out the back window to see if he can spot where that alarming noise is coming from. Also note at which RPMs the noise increases more that you'd expect for the given RPMs. Do you have any other issues with engine, like hard starting, or backfiring? Or how about transmission or belt slippage? Also is it the same loudness when in high range? Be sure engine and trans mounts are all secure. Check to be sure nothing on the body is touching the engine and maybe magnifying the noise at higher RPMs.

I'm working with a 2015 MSU-500. Basic symptoms are it cranks well, but will not fire. It has spark, and it has fuel spraying out of the injector (and spraying starting fluid into the throttle body and plug hole makes no difference). It has compression. I bought it not running, and no other information was available. It has 775 miles on it and 127 hours. It looks to be in very good shape. Previous owner replaced fuel pump, ECU, coil, plug, and the fuse/relay box that mounts on the firewall, then gave up. My questions relate to cam/valve timing, considering the symptoms and diagnostics so far. My thinking was the woodruff key sheared off and the crank spun, making it out of time. My question is, by the pictures attached does anyone have an opinion as to the cam/valve timing being correct? In the crankshaft picture you can see a timing mark visible. In the camshaft picture I have arrows directed towards what I think are timing marks (which appear to be exactly 180 degrees from one another). However, the long arrow in what appears to be bolt configuration in line with the piston/rod line. Here is a puzzling note... in the position you see in the pictures... I have valve lash on both the intake and exhaust. I think it's at TDC, given the visible crank timing mark and valve lash on both valves. Any thoughts ? Does this appear to be in proper valve time ? Have I missed anything simple ? Thanks in advance for your input.

It is a good looking rig for sure, the problem is it is sold by Massimo! As a former dealer I should warn you that Massimo does NOT honor their warrantee, I sold their products for three years and once the total they owed me reached $50,000 in unpaid claims I dropped them. So buyer beware! Try aodes.com they have a brand new Workcross line that is very nice and as of this morning across the country they only had 8 open warranty claims, Scott is the claims adjuster and is awesome~!

I appreciate this insight.. Helps a lot.. Now I feel I am not the only one experiencing these symptoms How fast have you pushed your machine over 25mph yet? I don't dare has the engine revvs so loud feels like I might blow the engine

Hi Space Ghost and welcome. I'm one of the originals here but don't post much these days. After reading your posts I feel obliged to reach out to you. Firstly thanks for your service and the sacrifices you've made. We are a Powersports Dealer and can and will give you at least a 10% discount on parts and accessories you may need. Contact other Powersports dealers and they will help you too. You deserve to get the best deals going. Contact me at any time and just mention UTV Board. Thanks, Mike.

My Service dog Bärli on the left with his battle buddy Louie on the right.

Welcome Space Ghost, I too just upgraded from a quad ATV to a full cab UTV. For many of the same reasons as you. My service-connected disabilities make it very difficult to ride and be out in the elements anymore. The new UTV is making riding still possible. Thank you for your service!

Welcome! Great intro and pics. I got a good laugh on this one, so appreciate it!🤣

As with any forum you join, there is a requirement for an obligatory introduction... and that seems fair. How else do you get that first post in there without jumping in with some stupid question right out of nowhere? Hi. I'm Space Ghost. Well, not really, but that was my call sign on my last deployment before an IED made me non-deployable, and I an now retired/disabled, and living on my wonderful VA disability. I did almost 28 years in total between the Army, Army Reserve, and National Guard. 1 deployment with the Reserve (Desert Storm) and 3 with the Guard (1 pre, and 2 post 9/11) Married (going on 30 years) one of each. (both out of the nest) My vehicle is (at least not yet) not a UTV, however, it is an ATV, A 2001 Kawasaki Prairie 400. BTW, That's Brandy, my former PTS/TBI service dog on the bike. RIP old girl. She's internet famous. Perhaps you've seen her before... The reason I'm here is that Arthritis is starting to set into my wounds and my mobility is getting worse. I will be selling the quad bike soon, and going with a SXS, and have selected a Can Am model as the replacement, so I figured I had better get on board a forum somewhere. Just put in for my Guard retirement, and will be very soon looking to get into a Commander 6x6. Wouldn't mind having the Limited with the Hvac system, but am really not sure it's worth the extra 10 grand or not. Plus it's 500 pounds heavier, and I prefer the doors off in nice weather. It's so much easier when working in the yard, and so much more fun when on the trail. Anyway, I'm here now, so it will help me research more and make up my mind. Plus once I have it, I'll be able to share stories about it and of course, continue to learn more, as it will be my 1st sxs. Still have time before I get my retirement. Takes a good 90 days at least according to the guy I talked to... Typical government efficiency... lol.

turns out intake valve was way too tight . adjusted it to 5mm and runs good again.

Is there any way that you could post close up pictures of where the springs would go and the rods on this eh65 engine I took pictures but cant find them and I can get it to run but its not right imo

Thanks for the information Paul

Replaced injector and it has been running well until yesterday. Now it’s cutting out again mid throttle when it gets up to full temp. Possibly misfiring too did smell some unburnt fuel at one point when it would cut out. Light throttle or flooring it and it does fine. I replaced the injector again but no improvement. Any ideas? What should I look at next?

Yep. Add a second muffler and make sure the exit pipe aims down toward the ground. And insulation will help, too.

I have a 550 and the gear shifter is a stiff, often difficult thing to use. There is a trick to getting it into low without it popping out of gear when you give it gas. My "LOW" is all the up on the shift knob. I saw a Hisun dealer video that said to keep upward pressure on the shifter with your hand as you slowly give it gas to move forward. There will be an almost imperceptible "click" when it starts to move. Mine does this 7 or 8 times out of 10 and as long as it does that last tiny click, it won't pop out of gear. I operate on some very steep inclines so I have to be sure the low range IS engaged. I think the check engine lamp is also the oil pressure monitor but I could be wrong. I always wait the few seconds until the check engine lamp goes out to shift into gear and move. My 550 does exactly the same on start up. I found that if you turn the key on, and wait a couple of seconds for the fuel pump to get up to pressure and stop before cranking to start, it usually will not try to die out when it does start, or lessens that. Sort of guessing that the injector may be slightly starved for fuel while the pump gets up to pressure. Once there, no problem. Lastly, these like premium gas. They will run on 87 octane but prefer higher. Also look to be sure your machine has an in line fuel filter. Some were shipped without them causing early injector failure. Those don't like any dirt at all.

when I fire it up the check engine light comes on and idling feels like engines gonna die then check engine light disappears and idles fine.. its extremely loud which apparently is normal then I press the gas it revs really loud to about 3000rpms and that's when i don't wanna go quicker then 15mph i really wanted to go faster the tranny sometimes doesn't engage.. especially when I want to go to LOW.. usually I have to make sure it engages to HIGH first then switch to low.. sometimes the gear is just hard to move.. maybe bc wheels are turned too much idk.. but this week I will take some videos not sure if I can upload them

All those codes deal with spark in one way or another. To search for manuals click on the 3 bars in top right corner. That will take you to a webpage to search for a repair manual. You'll probably have to remove the fuel tank and the air blower to get access to the tdc inspection port. Directions are in the manual. Good luck

Best thing is to reset the ECU. With the key in off position. Turn key on then off 5 times within 30 seconds. Make sure the fuel pump kicks on each time. After the 5th on/off cycle. Leave off 1 minute then try to start the machine. That should clear the error codes and reset the ECU . Proper procedure to start is turn key to on. Then once the fuel pump shuts off. The proceed to the turn the key to the start position to engage starter. On this site there is a download section section where shop manuals can be searched for. If the ECU looks new it may have been replaced. It's also possible that it was a bad replacement. I read somewhere or watched a video stating that bad ECU for these machines were being sold on fleebay. Hope that is not the case.

Welcome to the site H Loc. Could you elaborate on the engine and tranny issues a little? Slipping, grinding etc???

I may have a complete used rebuilt rear diff, still in the process of rebuilding it. or possibly a case that have been heli-arched ( welded) . If you’re still in need, reach out. tskm143. At. Gmail

Hello All... (2015 MSU 500) Well, I finally got a chance to start the diagnostic on the machine. I have found: 1) has spark, 2) has fuel, fuel pump working (and injector is spraying), 3) has compression. Cranks (at a good speed), but will not start. Sounds like it wants to start, fires every once in a while, and the use of starting fluid makes no change. Not sure if the valve timing is correct. Does anyone know (or know of a good place to find) how the timing marks should be aligned for TDC ? There are 2-dimples on the camshaft (opposite of one another), and currently they appear to be in line pointing to the crank at I think what is TDC (i.e. in line with the piston, rod, and crank). I can't find an inspection window to see any crank timing marks. Also, I have what I believe to be some fault indicators displaying on the dash info display. They are as follows: 201, blinks 4 times, 202, blinks 4 times, 352, blinks 5 times, 336, blinks 5 times, and 37, blinks 5 times. Anyone know where I can find what they may be indicating ? The ECM looks brand new, and the fuse/relay box was replaced by me (previous owner destroyed it trying to get it open). The unit has only 775 miles on it, and 127 hours. It's in good shape, with what I believe all original tires and equipment (although it's missing a passenger seat). Any thoughts would be appreciated. Thanks... Larry

I am having same issues when idling as well.. I don't want to push pass 3000rpms or 15mph bc its so loud is that just the way it is?

Got almost the same machine and set up. Bought mine in Peterborough ON.. but the engine and tranny I am not too happy with.. It does the job to plow but I can't go over 15mph without hearing the engine roar.. tranny is terrible especially hitting LOW

I got a new 2022 Hisun Sector 750 I only use it for plowing and does the job but The transmission is not that smooth and need to really pull it to get it into gear sometimes.. Getting it into LOW is a pain at times It idles really rough.. The check engine light always pops up when I start but goes away after a few seconds When i revv over 3000rpms the engine makes a heap of noise.. and can't go over 15mph without hearing it from the engine You get what you pay for