SOURCE: wont shif into 2nd gear grinds
Normally the problem would be a bent shift fork and that may indeed be the problem. The shift fork is a part of the gearbox and works by sliding a gear with "dogs", (pins), left and right on a shaft so that it engages with another gear. If a fork gets bent it will travel left & right as normal but since the slider gear is out of position due to the bend the gears don't mesh properly, i.e. the slider gear doesnt quite reach far enough into 2nd gear for the two gears to mesh fully. This is not a repair for the novice.
SOURCE: Grinding from rear shaft going into motor
There are two bearings in the assembly. The front is a needle bearing and the back is a ball bearing. One of the two (or both) are probably bad. I don't understand why the brakes would affect the bearing noise. Are you certain the brake pads are not grinding on the rotor?
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SOURCE: engaging 1st gear the gear grinds an clunks into
This happens when the parts of gear box is not proper due to misalignment. hence service the gear box first.... also change the oil and all the ball bearings of the gear box ... lubricate every parts in gear box.
SOURCE: r1 gearbox
You have a bent shift fork. The engine comes out and the bottom case gets removed. This exposes the gears and below the gears, the shift drum and shift forks. Generally speaking this is not a job for the Saturday mechanic. Some special tools are involved.
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SOURCE: HOW TO STRAIGHTEN A BENT YAMAHA RHINO FRAME
I would think that it would be cheaper just replacing the parts that need replacing and bill your friend for it later
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