Quantcast
Jump to content


Massimo T-Boss 750 hard starting

Byron Johnson

By Byron Johnson
in Massimo UTV SxS Forum

 Share

Recommended Posts

Byron Johnson Newbie

Byron Johnson

Posted
Posted

Does anyone have a had time starting there utv.

I have a T-Boss 750 and I have had to put 2 starters in and put heavier wire to the starter but it still has a problem starting. it will turn over and than die before it wil turn over again. could it be that there is to much compression that might cause this problem

 

Thank you

  • Alex changed the title to Massimo T-Boss 750 hard starting
  • 7 months later...
  • 4 months later...
RaceCraft Newbie

RaceCraft

Posted
Posted

This is a common issue. We are a dealer in Iowa and pretty much every new Tboss 750 (within the last year) have this issue. We are working on ECU programming to fix it.

  • Like 1
  • 2 months later...
  • 1 month later...
Jim from Hastings Newbie

Jim from Hastings

Posted
Posted (edited)

I have a  Massimo T-Boss 750 with this exact same problem.  They replaced my ECM...no change. I  basically burnt up my starter and positive wire to the starter. These were replaced once they found the root cause. The problem is the cam assembly.  It has a compression release at low (starting) RPMs. Centrifugal forces closes the valve at higher RPMs. Massimo was of little help to my dealer... three cams were tried.  Finally one worked.  It's like a new machine...this took  nine months. It's starts first time every time. How wonderful.  But it was a nightmare and more time in It's first nine

months in the shop than on the trail to get it fixed. Great side by side when you can start it.  Massimo needs to fix this cam issue, quit shipping machines to dealers that will not start and support the T-Boss 750.

20230218_213549.jpg

20230218_213521.jpg

Edited by Jim from Hastings
  • 9 months later...
Tom750 Newbie

Tom750

Posted
Posted
On 2/18/2023 at 9:44 PM, Jim from Hastings said:

I have a  Massimo T-Boss 750 with this exact same problem.  They replaced my ECM...no change. I  basically burnt up my starter and positive wire to the starter. These were replaced once they found the root cause. The problem is the cam assembly.  It has a compression release at low (starting) RPMs. Centrifugal forces closes the valve at higher RPMs. Massimo was of little help to my dealer... three cams were tried.  Finally one worked.  It's like a new machine...this took  nine months. It's starts first time every time. How wonderful.  But it was a nightmare and more time in It's first nine

months in the shop than on the trail to get it fixed. Great side by side when you can start it.  Massimo needs to fix this cam issue, quit shipping machines to dealers that will not start and support the T-Boss 750.

20230218_213549.jpg

20230218_213521.jpg

 

Jim do you happen to know the part number for the cam that worked?

Jim from Hastings Newbie

Jim from Hastings

Posted
Posted

I am quite sure they didn't change the part number and the change is so small it is hard to mic it to find if one is good or bad.  That problem is super annoying but once you get the cam that resets so it releases compression at next start IT WORKS GREAT. Please call PSI in Davison for more details.  Matt took lots of notes but I don't know if he still works there.  Let me know how it goes.  It is worth pursuing. 

  • 2 months later...
Brabe0524 Newbie

Brabe0524

Posted
Posted (edited)

I've had my Tboss 750 for 2 years now and replaced the starter twice. It's not sitting on the side of the drive and once again having starter issues. Has anyone had any luck identifying a good one from a bad one? Jim I appreciate the insight and will try calling PSI, but since I'm in Iowa I'm not sure they'll be able to do much :)

Heck of a machine, but this starting issue has me livid....a known problem that Massimo isn't willing to address.

Did you have to replace the entire 72013 assembly or is it just one particular component?

Edited by Brabe0524
Added question
Jim from Hastings Newbie

Jim from Hastings

Posted
Posted

Brabe0525,

They could only get the whole assembly,  as I recall. They had to try several to get a good one.  They gave me one of the bad ones that I look at every day. My Tboss had been like a new machine ever since.  It is almost impossible to start the T Boss with a defective cam as it won't allow any compression release when you try to start it. And yes,  you will burn out starters AMF starter wires.  It's great when it works right but at one time I was as frustrated as you sound. Stick with it until you get a good cam that will allow compression release. In going to try to include two pictures of the cam assembly. 

20240125_195520.jpg

20240125_195503.jpg

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Similar Topics

    • SouthernGypsy
      Help needed, Anyone recognize where this Internally Threaded Bolt belongs?
      By SouthernGypsy
      We have a 2018 Cub Cadet Challenger 400 and I found this Internally Threaded Bolt with a 10mm head size laying in the floor of the shop bay here on our ranch where we park the Cub Cadet.
      Trying to figure out where it belongs...
       




    • se3388
      Anyone else with a UT10X?
      By se3388
      Hopefully someone else will buy a UT10X and join in.
       
      Steve.............
    • Jacob E freeman
      2018 cub cadet challenger 750 over heats no one knows why
      By Jacob E freeman
      I have a 2018 cub cadet challenger 750 I bought brand new almost 2 years ago the first month I had it the exhaust broke and burnt the spark plug wire in two that was a recall so the dealership installed the new one it had a different design and it bolted up to the bottom two plugs below the spark plug the dealership said they had to Adjust the exhaust valves I get the machine back thanking everything is good now wrong not even a week after I get it back the timing chain tensioner comes apart inside the motor I take it back to the dealership They put one on I get the machine back thanking everything is good but then just like before not even a week goes by when I was riding the Machine automatically quits going come to find out the wet clutch was burned up the primary clutch head stripped off of the splines I get that fixed and then  it overheats I take it back they bleed the air out of the coolant they bring it back to me the same day that I get it back it overheats again I take it back they temporarily fix it again just enough to let the warranty run out and now the machine has been to multiple different mechanics I have had them try to bleed the air out they have stood it up on its end I have had the water pump changed I have had the fan hooked to a switch so I could leave it on all the time but still almost 2 years later not even 200 hours on the machine and I cannot ride it The dealership will not take it back as a lemon I have tried I am at my wits end I have no clue what to try next
    • Gerald Mohs
      2023 massiso T-boss 750
      By Gerald Mohs
      Have a 2023 massiso T-boss 750 stopped one day and won't start. I've checked the fuel injector and has good spray. New spark and has spark. Need advice on getting the trouble codes. What code reader do I need to purchase? Thanks for any help. Jerry 
    • Texjpr
      Help! Hub safety-hour meter switch problem
      By Texjpr
      2002 ranger 500 4x4 stopped running and wouldn't restart. Service manual wiring diagram helped identify the hub safety switch as the culprit. Using jumper wires to bypass  switch allowed the engine to start and run normally. Inspection of switch showed melted epoxy and a strong smell of burnt electrical. Unable to find replacement part either used or new. Is there a work around other than jumper wiring?

UTV FORUMS

MORE SECTIONS

FOLLOW US ON

GET IN TOUCH

  • Automotive Webmaster
×
×
  • Create New...