Massimo T-Boss 750 hard starting

[Byron Johnson]

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

[Mbrew99]

I have a brand new one doing the same thing. Did you ever figure this out?

[RaceCraft]

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.

[CDRK]

Brand new tboss 750. Won’t start. Not just hard to start. Won’t start. 

[CDRK]

Has the ECU programming fix been successful?

 

[RaceCraft]

Totally forgot about this post.... Yes, it has definitely helped!! 

[Jim from Hastings]

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.

Edited February 19 by Jim from Hastings

[Tom750]

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.

 

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

[Jim from Hastings]

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.