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Re: Cluncking/grinding sound as i pull away in most gears...
Stop riding the bike. The tranny could lock up at any moment > like at 60 mph in traffic. The gearbox will need to be opened upand the problem located and fixed. The fix is not going to be cheap $$$$
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sounds like the cogs on the pull start are not retracting properly take the pull start off and spray it with brake cleaner and re grease it make sure it works correctly when you pull on the cord the cogs come out and when released they fold in
This happens when the back wheel is not aligned properly with the chain. As the wheel turns the chain is being pulled to one side causing it to slip to the next set of cogs. To solve the problem first you need to loosen the wheel by opening the 2 nuts on the axel. If the chain slips inwards towards the wheel you need to move the front part of the back wheel to the left from a view point behind the bike. If it slips outwards away from the wheel then you need to move the front of the back wheel to the right as viewed from behind the bike. When the chain and cogs of the rear wheel are lined up in a straight line the problem should be solved.
Sorry but it's not loose, you have a bad shifting fork. The first gear fork is going or gone which causes the mis-shifting. You are hearing the clutch basket most likely. With the backlash in the gearbox you can get a noise coming from the clutch hub coming lose from the primary drive gear it is attached to. I also believe there is a chain for the harmonic balancer that needs to be adjusted. It makes a nasty noise and sounds like the engine is almost grinding when it does it. The noise will go away under accelleration.
My machine had the same problem. A service tech looked at my machine and pulled out the OPC Belt Drum Unit. The drum unit had a few issues: 1) jagged rips in it, something caused by running papers through that had staples or paperclips in them. So when the drum turns, it scrapes other parts and the machine sounds like its going to drop all its nuts and bolts--at least mine did!)! and 2) the spindles from the OPC unit has come loosened and fell off. The spindles and plastic cogs were found way at the bottom of the OPC Drum slot. This too was thought to have added to the rips in the drum.
I replaced the drum ($399 was the cheapest I could find) and the problem went away.
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