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Massimo T-Boss 410 Died on the run and won't restart

k-bo

By k-bo
in Massimo UTV SxS Forum

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k-bo Apprentice

k-bo

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T-boss 410, I have no idea. The service manual said 1400 kPa. 1400 kPa/6.895 kPa/psi = 203 psi (not 217, my bad). I'm already operating way above my pay grade on this. I have gone above and beyond to fix it, but now I'm ready to move on, cut my losses, pick myself up, dust off, and load the SOB on a trailer.

k-bo

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TapBoss
TapBoss

Keep us updated!

T-boss 410
T-boss 410

Hey, keep us posted please.

motojoe
motojoe

Just for fun if your compression is as low as you say check the valve adjustments a tight valve could cause the loss of compression and also cause it not to start.

k-bo Apprentice

k-bo

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Current status: On 3/7, I put everything on the vehicle back together and took it to San Marcos Powersports, a Massimo dealer. As anticipated, they are backed up with repairs for weeks and are having labor issues just like most small businesses these days.

Prior to packing it up, I did a proper compression test and got 105 psi. So, this still seems low. Here's the summary of it all now: cranks and will not start, has initial one time fire at beginning, throws P0201 (injector malfunction) and P0351 (ignition coil issue) codes, has spark and fuel, ignition coil and pickup coil have good resistance readings as does the stator, no visible mechanical issue - everything engages and turns, and wire harness is delivering voltage to ignition related circuits. ECU function and electromechanical ignition triggering cannot be verified with my current toolset. So, I have punted.

k-bo

  • 4 weeks later...
motojoe Contributor

motojoe

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Posted

Just for fun if your compression is as low as you say check the valve adjustments a tight valve could cause the loss of compression and also cause it not to start.

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  • 5 weeks later...
k-bo Apprentice

k-bo

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Update on my T-Boss 410: It has been a San Marcos Powersports for over a month. They started evaluating it about 2 weeks ago. The mechanic there determined that it has a broken crankshaft chain. This explains the low compression readings and the computer confusion. Parts are now on order and an end to this saga is in sight. It'll cost me less than I thought, but it is still quite a chunk of change nonetheless.

More to come...

k-bo

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