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vibration

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What can cause my machine to vibrate on first and second gear acceleration? I was thinking a universal joint but now I am thinking a motor mount. Anyone have an idea?

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What year and model do you have ??  ---- I am going to guess you have a trx450 from your avatar  , maybe a ES cause I can't see a foot shifter in the bad pic ???  And from the decals I would think 2004 

 

I like to jack and block all 4 wheels in the air and run it ,  sometimes it helps to isolate a noise or vibration ----  check the easy things first ---  did you check the oil in your front and rear differentials and change the engine oil and filter lately --- maybe adjust the valves 

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It is a 450s Forman. 2004 Good ideas. I will try them. Yes, the oils are current. The valves were adjusted to specs within the last year. It is a foot shifter. The vibration is only in the low gears and higher rpm. If I start out slow no problem. So for the time being I have a work-around. Thanks for your suggestions.

 

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It could be so many things , maybe a bearing on the rear axle   -----   If the engine ever ingested water , it could have bent a rod , it will still run but it could vibrate ----  also if the connecting rod journal is worn the piston will slap around in the bore 

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Check for any play at the swingarm. I've seen many of them the frame will crack out, spreading it enough, to give the swingarm just a little play under pressure (at first) and give weird vibrations.

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