Sounds like the cut off switch at the stand is faulty
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: 1997 Yamaha FZR 600 cuts out when shift into first gear
Does the bike have a sidestand switch that cuts the power if the stand is left down? If it does, disconnect it and temporarily join the ends together and try starting....
SOURCE: fjr 1300 (2001)year problem engageing 1st and 5 gears
change oil and filter they may need topping up or has a blockage stopping oil flow
SOURCE: The engine loses power when 1st gear is engaged,
This sounds like a broken tooth on the main axle. This would account for the lump in every gear and a power loss due to the axle being bent also. I would change the axle, support bearings, and the gear the axle engages. Check the output shaft for bending also.
This could be bad bearings on the shafts but is is highly unlikely if the gearbox oil has been kept at proper levels. In any event, the gearbox will need to be opened up for inspection.
This image is generic and not specificly the TRX850
SOURCE: engine cuts when selecting 1st gear
disconnect side stand switch to check if that is faulty
Testimonial: "thanks, was faulty wiring. Replaced & Cleaned Push Switch. All Fine Regards"
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