Quantcast
Jump to content


still going

Joe Breaux

By Joe Breaux
in Massimo UTV SxS Forum

 Share

Recommended Posts

Joe Breaux Mentor

Joe Breaux

Posted
Posted

just an update on my MSU 500 . For all the misery it caused me the first 2 yrs, and the combination of some quality YAMAHA parts, it has now become a reliable ,useful UTV without the constant fear of having to push or tow it back from trails. I have not had a single issue pop up in a very long time.. FINALLY!....and as a side note, I just bought  a C FORCE 600 ATV to replace an old and well used  Honda that finally after 18 yrs gave up a rod bearing.  So far the new one has really impressed me .. I like the new Power Steering and  this CVT Auto Trans is new to me on an ATV .. I m used to constant shifting on my Hondas .  It also has something I have never seen. Its EBS  engine brake system, as soon as you let go of throttle, it engine brakes you to a stop rather quickly.. its great idea for the grandkids safety . Takes a little getting used to tho.. All in all, I like it. We shall see how durable it is after break-in.. I do "RIDE" them! .....and they honor their warrenty! and the dealer is 15 minutes away.. 

  • Like 1
T-boss 410 Experienced

T-boss 410

Posted
Posted

That's good to hear, Joe. I hope you didn't just jinx yourself 😎. I haven't had to contact Massimo, so I don't know if they really did improve their customer relations.

There was a post here a while back that a guy had discovered that the battery cables were undersized, and he was working with the manufacturer to correct it. I never heard from him again. I can make my own cables, but I don't know what size to use. I'm assuming you don't have any issues with starting your UTV, but with mine it occasionally doesn't want to turn over. If I turn it off, then hit the starter again, it will start. I thought that maybe it was because of the undersized cables.

Anyway, even though I have ribbed you about your Massimo, I'm glad that you're enjoying it.

Joe Breaux Mentor

Joe Breaux

Posted
  • Author
Posted

never had issues with starting it.. always started right up..and in 5-10 minutes overheated! lol .. All is good now. But it was a nightmare from day one when I had to be towed back to Camp after 15 minutes of driving! Maybe your battery is aging or might not be large enough ? I had a 350CCA battery in mine new.. When it crapped out, I put a Marine Starting 600CCA battery under driver seat and ran new larger and longer cables.  used #6 AWG wires 

T-boss 410 Experienced

T-boss 410

Posted
Posted

Mine came with a 300cca, which just wasn't doing the job. So I bought a 350cca, which seemed to do the job, but it doesn't seem like it's still turning over fast enough. I remember a post from a member who was aware of the problem and was working on a fix. I could fix it myself, but I don't know what wire guage to go with.

Ben1098 Enthusiast

Ben1098

Posted
Posted

decompression release problems will give the "stall" and require multiple hits to get it to finally crank over.  Valve adjustment (exhaust) is critical to the decomp pin opening the valve.  Other problem is the actual decomp assy worn or a groove chipped out in the cam follower where the pin rubs at low RPM.  See older post of mine on the decomp assy in the cam....interchangeable with Rhino....identical down to the welds and flyweight interference problem.

T-boss 410 Experienced

T-boss 410

Posted
Posted
2 hours ago, Ben1098 said:

decompression release problems will give the "stall" and require multiple hits to get it to finally crank over.  Valve adjustment (exhaust) is critical to the decomp pin opening the valve.  Other problem is the actual decomp assy worn or a groove chipped out in the cam follower where the pin rubs at low RPM.  See older post of mine on the decomp assy in the cam....interchangeable with Rhino....identical down to the welds and flyweight interference problem.

Does this particular engine (Linhai 352cc engine) actually have a decompression release? I have a copy of the service manual, and I can't locate anything in the manual about a decompression release. Can you possibly show me where it is located? I'm trying to do as you advised, but I'm jot having any luck locating it.

The issue of hitting the starter a few times isn't a common occurence. This happens about 50% of the time that I start it when cold, especially after it's sat for a few days.

Thanks much!

Joe Breaux Mentor

Joe Breaux

Posted
  • Author
Posted

My 500 engine has no decompression release , but it spins easily and has always started easily.. that was never an issue..  blown head and head gaskets were the plague that fell upon mine from 1st day I bought it.. for which Massimo refused any warranty reimbursement from first day break down on 

Ben1098 Enthusiast

Ben1098

Posted
Posted

I cannot find the post....it was for the Massimo (HiSun) 500.  The decompression release is built into the valve train cam.  Remove cam gear round cover and notice the flyweights and stamped timing dots.  The pined disc rotates and the attached rod in the center bore of the valve cam and pushes up a button pin with a cam "flat" on the inside center rod cam in a cam....which hits the exhaust valve follower.  At higher RPM, the flyweights sling out, rotates the cam inside the valve cam, and then the button pin retracts below the cam profile.....full compression.  Yamaha Rhino had same build error as Massimo.....the sets were identical down the the welds and machining tool marks....SAME VENDOR?????  Die grinder work required to obtain the full travel of the flyweights.  One of my HiSun reworked cam/decomp assys was "borrowed" to fix a Rhino.....never to return.

The post covered the rework of flyweights, the wear gouge the button pin takes out of the cam follower, the small rod cam edge that wears round (less button pin lift), the error of adjusting the exhaust valve clearance with the decomp pin raised (up at low RPM thus need to manually rotate flyweights to lower pin button for adjustment OR turn the cam to be sure you are OFF the button...watch the follower for the "jump" coming off the pin).

  • 1 year later...
Joe Breaux Mentor

Joe Breaux

Posted
  • Author
Posted

Just an update.  It seems once you replace the trash HISUN parts that fail quickly with quality YAmaha pieces, the Massimo is a decent UTV. Mine is still running well. Have had no issues other than park brake cable broke. But I have to say I really like my CF MOTO C Force..Great machine. When my wife will let me ride it!

Joe Breaux Mentor

Joe Breaux

Posted
  • Author
Posted

😁Never seen my Hondas or my CF Moto run hot ever and after the mods,the Massimo does ok too.  Trails are shady and we usually ride early so WE don't run hot either. Can't wait for November when Summer ends 🤣

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
 Share
Go to topic listing


  • Similar Topics

    • AlphaSerenity
      Hisun Axis 500 Problems - Hesitation, struggles to go up incline, and low speed regardless of gear range
      By AlphaSerenity
      Hello,
      Before I invest $10k+ into a brand new UTV for the farm, I want to get my feet wet with a fixer upper and learn the mechanical side of things. I acquired a 2022 Hisun Axis 500 (Lowes-specific model) from an auction for $500. It has only 200 hours and 120 miles on the engine. It looks like the previous owner used it for ranch work and didn't drive it on trails, deep water/mud, or anything too crazy.
      While it runs and moves, it has some problems. It struggles to accelerate up any incline in high and low range and sometimes stalls when I let off of the throttle or change gears. When I apply throttle in neutral, it sounds like it is struggling for fuel/air and pops. When I decelerate, there is a grinding sound coming from the clutch, which I've read to be related to the one way bearing and is semi-common. The last thing I've observed is sometimes the speedometer display sometimes will show a much higher value for a few seconds after barely touching the throttle. Based on the documentation, if a problem is detected from the sensors, the instrument panel display should have an error code rendered on the screen in place of the time, but this isn't happening. Here is a video showing some of these issues (engine is exposed with console removed):
      https://www.youtube.com/watch?v=FFAkO5TaGps
       
      Here is another video of the clutches in action:
       
      I've done some research, but information on this specific unit and sister units is limited. There does seem to be transmission and clutch issues reported. I still need to check into the head gaskets. I don't have the equipment to test compression right now, but I do plan on ordering what is needed soon. I do have an order in place for some cables to read the diagnostics from the computer. There is a shop two hours away from me that works on Hisun products, but I am hoping the problem can be identified and is something within my ability to handle. Below is what I've already investigated.  I am leaning towards the primary clutch needing replacement right now.
      After getting it home and unloaded, I did the following maintenance/checks to it prior to operating it further:
      Changed the engine/clutch oil (and filter) and gear oils using manufacture recommended viscosity Changed the air filter and checked for cracks in the air intake flow. Verified good suction. Cleaned the throttle body Changed the spark plug and verified the gap was within spec (0.6-0.7mm) Changed the coil and coil wire Changed the fuel lines, fuel injector, and verified the fuel pump was outputting the correct initial prime pressure for ignition and continuous pressure after ignition. Also completely emptied the fuel tank and made sure octane 91+ fuel is being used per manufacturer specs. Ran seafoam through system too. Cleaned the spark arrester and verified no cracks or gaps in the exhaust flow Changed out the O2 sensor Checked all wired connections to ensure they were secured and no breaks were visible Checked the belt for tightness and for any signs of wear and tear Verified 4WD and the differential lock function as expected - still hesitates and struggles uphill Verified the fan gears in the shifter are not corroded and working as expected ECU was reset after replacing sensors and fuel-related parts  
       
      Thanks!
    • mike28honda
      Axis 500 cuts out at about half throttle
      By mike28honda
      I have an Axis 500 and never had any problems until now,it cuts out 
      at around half throttle. I changed the TPS with no difference, acts like the seatbelts aren't set but can get up to around 15 mph as long as I don't give it too much gas, thanks for any advice 
    • Nick Varnes
      Bennche bighorn 500 idle issue
      By Nick Varnes
      So I have a Bennche Bighorn 500 that I bought used a couple years ago. Was working fine until this winter when I was plowing and I think it drained the battery. And had a difficult time starting and staying running. Idle seamed really low, and would only stay running if I pushed on the throttle. So I changed the battery, and the acm valve, fuel filter and spark plug it will start up and surgery to 3k rpm but comes back down and dies, unless I give it throttle. I am getting fairly good amount of fuel from fuel pump.  It does spit at stutter right before it dies. What should I try next?
    • Hoppy one
      Bennche 500, replaced stator no fire
      By Hoppy one
      I replaced the stator on our Bennche 500 because it was not charging. It ran as long as you kept the battery charged. I replaced the stator now it’s not firing. The only problem I found was a wire in the new stator for the crank position sensor was in the wrong place in the plug. I switched it around but still no fire. Putting a meter on those wires and cranking the motor showed no voltage from the crank position sensor. Something I did or a bad “new “ part? Thanks for any ideas.
    • Jeff freeman
      Utv wont start and broken fuel injection wire
      By Jeff freeman
      I have a Coleman 550.  Was having problems to start with where it would start and then shut off after a couple tries. It would take off and be good. It then got to a point where it would not start at all. I replaced the fuel injection twice the second time I replaced it I noticed a mouse or something had chewed one of the wires that connect the electrical to the fuel injector. . So two-part question first does anybody have a part number for that wire harness?  Second, any other ideas after I fix the wire harness permanently on what could keep it from starting I have gas flow up to the fuel injector.


UTV FORUMS

MORE SECTIONS

FOLLOW US ON

GET IN TOUCH

  • Automotive Webmaster
×
×
  • Create New...