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By Cliffampranch
Hi All,
I have a 14 mile round trip on level roads to reach the property where I work with my 2025 Amp Crew Ranch (purchased, April 2026). That 14 mile round trip uses 60% of the battery as shown on the gage for a calculated range of 23.3 miles versus an advertised “up to 50 miles” range. A mile or two working on the property gets me a flashing gage and warning beeping by the time I get home. The dealer was good to work with and even with a new battery (yesterday) the results were about the same, although there seemed to be more power and a higher top speed. I own a Mach-e Mustang so I am familiar with how various conditions affect range, but less than 50% of advertised range just seems like there has to be something out of whack.
Now I’m wondering if there is a controller and/or software issue affecting the range and performance. At various points the Amp seems to lose power for no reason and then has trouble maintaining speed. Any ideas?
Also, twice now, the brakes seem to have not released fully. After noticing reduced speed, I stopped and check the rotors and wheel…..HOT! So, now every time I feel less power, I stopped to cycle the brakes and check the temperature. Very annoying. Are there any adjustments to be had?
And yes, as noted in another post, sometimes the switching from forward to reverse or high to low speed feels sluggish or balky.
Lastly, while an electric vehicle powertrain is quiet, my Amp was horrible from a road noise and vibration standpoint. This was easily fixed by locating panels vibrating on other panels or the frame (even the cup holders were vibrating) and installing felt adhesive pads at the contact points (seat to frame, windshield to frame, fenders to frame, etc.). This is a $10 and 1/2 hour fix that makes a significant improvement in the driver/passenger experience. Tire noise, yes, but that’s because of the knobby tread.
I’m trying hard to like my Amp and would appreciate any tips, advice or solutions.
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By Ronald
I made my first oil change on a axis pro 750 I bought from lowes. I found a substance that looked and felt like rubber bands in the oil filter and oil strainer at drain plug. How in the world does this happen unless done on purpose at Hisun factory or assembly. Has anyone else seen something similar?
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By lfredg
I have a Massimo t-boss 410 in shop will not start with injector installed, have to hold above hole to get to start , if unplug tps it will run if map sensor is out. replaced ecu, map,and injector.
Still no run, pulled the valve out of throttle body it runs high idle to an idle if out a 1/4 inch, still have hold injecter out to start, but with the valve thing out you can install map and injector for it to run. what do I need to do.
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By Rocket
2020 Massimo T-Boss 410 efi, UTV has approx. 600 miles on it. Traveling down a dirt road at 20 mph and slowed down to make a sharp turn, engine stuck in fast idle. Fast enough that the clutch would not disengage. Forced it into neutral and punched gas pedal trying to get the idle speed down to where it should be. Idle started to come down from the fast idle then in about four seconds the RPM dropped to zero and engine would not restart. Towed it back to the cabin. No one around here will work on Chinese UTVs so if I don’t fix it will be just another P.O.S.
Checked:
Spark plug sparks.
Fuel injector injects.
Rocker arms rock, cam turns
Will not run on a prime. (Prime, squirt gas in the spark plug hole, replace the spark plug and attempt starting the engine.) Ordered an OBD reader and the adapter for the Massimo /Delphi 6 pin connector. Down loaded fault codes from the;
Delphi MT05 # 28265491 ECU
P0311 Cylinder 11 misfire detected
P1800 Manufacture Control
P0711 Trans fluid temp sensor A
PIC Manufacture Control
None of these fault codes matched up with any published list of the Massimo/Delphi ECU and fault code reader would not reset codes. With all these nonsensical codes it must be a faulty ECU. After all how can you have a misfire on Cylinder 11 when it’s a single cylinder engine. Ordered and Install a new Delphi MT05 28265491 ECU. (Fig. 1) After attempting another unsuccessful start the new ECU showed P0311 Cylinder 11 misfire detected. Now I know what “P0311 Cylinder 11 misfire” means. It means the engine is not running and the ECU does not know why.
An engine needs three ingredients to run, Fuel, Compression, Ignition. Confirmed it has spark, fuel, and assume it has compression. After all it had enough compression to run moments ago. Ordered a compression gauge that fits that little spark plug hole used in the Massimo to get a real reading. Compression test, 35 psi. OK, now I know why it will not run.
Guess the cylinder head has to come off to find out why it has so little compression. EUREKA, FOUND IT! A small piece of metal stuck in the intake valve seat. (Fig. 2) Therefore the intake valve would not fully close. After further examination found a piece of aluminum mesh stuck in the intake port. (Fig. 3) Checked the cylinder bore for defects caused by the aluminum fragments. None were found. Removed the aluminum fragments from the head and reassembled the engine. (Fig 4) The valve timing was a challenge doing this in the field. After reassembly tested compression, 165 psi. Attempted another start. Started right up and ran as good as it did before. Shut it down right away to check for more aluminum mesh in the induction path. The air filter is where the aluminum mesh came from. (Fig 5)
Now that all the facts are in, this is what happened. The 352cc, Chinese made Linhai single-cylinder, 4-stroke, liquid-cooled, SOHC engine with Electronic Fuel Injection (EFI) and 25.5 horsepower is a very rough running engine with excessive vibration. It rattled and shook the air filter to the point where the screen on the inside of the filter fatigued and piece of screen broke off. The screen fragments traveled down the induction path and lodged in the throttle body jamming the throttle plate preventing the engine from returning to idle speed. When I punched the gas pedal the screen dislodged and traveled to the intake valve where the screen got stuck preventing the valve from closing. The engine died and would not restart. Now I know, change the air filter yearly whether it needs it or not.
Took 20 min. of running the UTV for check engine light to go out.
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