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Hello, I am attempting to do some maintenance on my late fathers Massimo MSU 400 that he bought back in 2015. It has had numerous issues over the years and needless to say it is by far the most unreliable thing on 4 wheels that I have ever experienced in my life. That being said I would like to change the oil on it, and I cannot find an oil filter that cross references the stock filter number that will work. So far I have tried a Napa/wix 1394 that cross referenced to the Fram 4967 that was shown as the original cross reference. Both filters will immediately start to leak oil as soon as the machine is started up. I do have an actual Massimo filter ordered from Amazon which is 15200-F12-0000 and that one has no cross reference to be found. Does anyone know any filter brand and number that will work on this engine other than the stock filter? I don’t want to continue buying filters only to have them not work and waste more oil in the process.

I am replacing my clutch and the nut on the main shaft snapped off on the secondary. Does anyone know how to replace that shaft. I can't find any info. Thanks

So I have a msu400 efi. Ran fine, pulled it into the shop to do my typical routine maintenance, cleaned air filter, change oil, etc. So now it won't run right. Starts and idles, stumbles on acceleration. If I baby it I can get it moving, but dies after a few hundred feet and then is hard to start. Will start back and idle just fine as long as you don't rev it up. So what I've done so far. Verified fuel pressure at injector, never losing it. (54psi) replaced fuel injector. Verified spark right after dying (sparking like hell) checked valves. ( Proper clearance) replaced map sensor, idle control sensor, and tps. (No change) disconnected negative battery cable for 20mins (no change) checked exhaust, (free and clear) Checked air filter again and intake tube (all good) After it dies or if I just let it sit before starting it, it throws code 113, which I've seen is IAT voltage too high or open circuit. I have a 4 wire sensor and am not sure the wiring back to the ecm nor can find a good diagram. Not even sure if this is a problem or just a code it would throw if it is just not running. Any help would be appreciated

I just bought a 2019 MSU 400 w/ 700 miles. I got it home yesterday and noticed a faint rubber burning smell. I can't track it down. I'm on dirt so its not tires and pavement. Parking brake is off. Temp on the machine appears fine. Thx for any suggestions I thought maybe belt but I'm not racing nor going but a mile or two.

2014 Massimo MSU 400 idles perfect, runs ok up to half speed. From half speed if you step down on the gas pedal all the way engine dies. Engine is fuel injected, the map sensor, and the throttle body idle control sensor, and the fuel injector have been replaced. Also the fuel pump was removed and fuel pressure is ok, and fuel was checked for water. Air box and air filter have been cleaned, also replaced spark plug. From a dead stop if you step right down on the gas pedal all the way it dies, if you baby it, and go easy it will run ok until about half throttle, then after that it will die as you start to push down more on the throttle for top speed. Any ideas? I appreciate anyone's help...