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Hi all. I'm new to the site. A few years ago I bought a used Massimo. Recently I've had a issue driving above 25mph. The engine won't go any faster. In fact it seems to sputter and hesitate. The whole engine shakes. I've changed air filter.oil,oil filter, throttle cable oil/air cooler,and carburetor and still no luck. I was wondering, could it be the fuel pump. Should I invest in an electric fuel pump? I'm just not sure. It starts fine and revs while in neutral. Any advice would be great. Thank you VID_20220722_110957473.mp4

Anyone know what size bolt next to oil drain plug is in Massimo 700. Bolt sheared and I am working on getting it out. All oil leaked out through this opening - like it is another oil drain???? Why is it there next to oil drain plug???

I can't figure out what's wrong with the shifter in this utv. When running at 1300 rpm it takes brute force to shift in and out of gear. When I shit off the engine it shifts like butter. Is there something I'm missing here?. I thought maybe it was to high an idle but from what I gather 1300 to 1500 is where it should be. Thanks for any help

I have changed the plug, changed the fuel injector, drained the fuel tank looking for water, replaced the coil , checked out the wiring on top of the fuel tank looking for bad connection . The UTV will sputter but will not start. Any ideas will be helpful!

This is a carb model not EFI it was in pieces when I got it. I got it running by replacing the fuel pump had to bypass this little reservoir thing I can’t find how it goes back in please help. Machine runs good but I have fuel coming out of the drain on the carb. This is a pic of the reservoir thing thanks