Yuck Fou Massimo - Another T-Boss 410 Owner Tale.

[MassimoNeverRunsLife]

2021 T-Boss 410 — and yet another story from someone who bought one brand new without thinking twice about the fact there's no real service department like you'd find at an actual dealership.

The Problem:
Around 20mph, it bogs down like it's choking on something. Pedal to the floor, it sounds like it wants to go, but it just won’t. Makes no difference if it’s in 2WD or 4WD—same sluggish result. Reverse works fine. Shifts between 2WD, 4WD, and neutral without issue.

I’ve searched online but can’t find anything specific that matches what I’m (admittedly) guessing might be wrong. Truth is—I have no clue what the fk the actual issue is, and I don’t have the kind of mechanical memory others seem to when tearing these apart. That said, I’m good with my hands and can follow directions—I just don’t have any clear ones to follow right now. Any help or pointing to the right direction would be appreciated- next closest massimo service center was "fk you" miles away they said, 

[WhiteLightning]

How many miles you got on it?  My 2019 got noticeably better after more miles got put on it. I guess I'm one of the lucky ones. 

[klm]

Your luck has a 99% probability of running out with a Massimo. 

[Ben1098]

COMMENT that Reverse works fine..........no bog down as in it revs up ok?  See rev limiter posts to bypass at the ECM.......MC DOCTOR has good drawings.

[MassimoNeverRunsLife]

@Ben1098 @WhiteLightning

Mileage is at 1,568. As for the bogging issue, I tracked it down to the MAP sensor—a wire underneath had a clean break in a spot I couldn’t see. I got it patched up, and that fixed the problem. From what I read, the vehicle was going into "limp mode."

It’s been running fine for about a week, but now there’s a new issue…

After driving for a while—usually at a steady cruising speed—something starts clanking loudly from what feels like under the seat. It’s pretty intense and only happens after the vehicle's been going for a bit, so I’m guessing it’s heat-related. I have to stop and let it cool down before I can go again. Based on what I’ve read, it could be the clutch, but I’m not sure which part exactly

 

[WhiteLightning]

Are you using good wet clutch oil? 

[Joe Breaux]

Condolences on your purchase of a Massimo non warrenty new utv ..from another foolish buyer who made the same mistake

[T-boss 410]

On 6/30/2025 at 8:16 AM, Joe Breaux said:

Condolences on your purchase of a Massimo non warrenty new utv ..from another foolish buyer who made the same mistake

Hey Joe, how's your Massimo running lately?

[Joe Breaux]

Actually its been running fine for a long time now..after spending a ton of money fixing all the problms that plague Massimos   the biggest issue I had was once you drove it off the lot, Massimo and Hisun refused to warrenty anything.As you know mine broke in its first mile. And multiple times in first few months.They refused to fix it

 

[T-boss 410]

Yeah, I remember that. Sorry that happened, but at least you managed to work out those issues and it's running well now.

[MassimoNeverRunsLife]

On 6/24/2025 at 1:13 PM, WhiteLightning said:

Are you using good wet clutch oil? 

I have never even attempted to look at it let alone would I know how without instructions.

 

 

Just sending an update out into the world here- T-boss has been sitting out in the workshop and just now getting time to re-visit this thing. Read online this could potentially be shift lever or shift cable adjustment, possible that it may not properly be engaging at high speed or something? Anyone have thoughts on this?