Earlier this year I purchased a decent 2910 with 2800 hours for raking hay. It starts great, no smoke but seems to vibrate more at idle than my 201 3 cylinders. Not terrible, but the cowl shakes a little and it just feels rougher. Around 1400 rpm it is the worst, but at higher speeds you don't notice it that much. I installed new injectors but no difference. It does lope slightly at idle, and I also tried bumping up the timing ever so slightly to compensate for gear train wear. Is this engine more prone to shaking versus the 201's, is my injection pump not quite right, or is there possibly an issue with the clutch that is throwing it out of balance?