There is power to the wheels, but no power to the tines.

There should be 5 positions for the gear selector.

Neutral
Reverse
Forward 1 wheels only
Forward 2 wheels and tines reverse rotation
Forward 3 wheels and tines forward rotation

If you have reverse tines only, then the problem is internal to the transmission. My guess is the wheel drive chain.

That knocking noise could be that the teeth on your main drive are worn out and chain is jumping them on acceleration.Pull th primary cover and check the drive gear for chain on motor sprocket.Replace it if worn to that point.

tighten the chain and straighten the back tyre

hello, upon inspection of the parts brake down looks like you have broken the drive chain inside of the trans to drive the wheels,there is no mencion if the belt and pulley turns and the wheels don't,did you check the belt and pulley?hope this helps,oh bring it over abd i will repair it,

If you are in gear when your rear tire locks up, that will also stall out your engine. Conversely, if your engine seized up while you were in gear, that would lock up your rear wheel from the other direction. However, as it sounds like you can restart your engine, that's probably not the case. One way to check is that if your wheel starts to lock up, immediately pull in the clutch. Your engine should keep running, even as your rear wheel is skidding along.

If the problem is in your rear wheel, there aren't a whole lot of things to check. This bike uses a rear drum brake, so check to see that's not binding in any way. I suspect that it won't be. A stronger possibility is that your rear bearings are worn out or insufficiently lubed. If they get hot enough and expand enough, they'll seize up your rear wheel. Pulling the rear wheel and cleaning / lubing the bearings would eliminate this possibility. If the bearings are dark colored and/or have flat spots, that's a sure sign that they've been abused and need to be replaced. A third possibility that comes to mind is that your chain and rear sprocket might be excessively worn. An old chain, with one or more rusty links, could kink up and jam. I once bought a bike with a nasty old chain and it did this on occasion. It would work fine for a while, but then kink up. Replacing the chain (and the sprockets, because they, too, were very worn) solved the problem for that bike.

hi it sounds like your front sproket is really worn and hooked when you turn the chain its not releasing the links smoothly ,replace it with a new one and check the condition of your chain it may be worth replacing a complete chain and sproket set as running a bike with a worn front sproket could lead to a back wheel locking up at speed if the chain jams

That will happen when the tines are engaged while the wheels are in Neutral as the tines simply drive the whole machine forward without the drag of the wheels being in gear. If the wheel transmission is engaged and this is still happening, then you have need for repair.
farmerbear at FixYa.com

the gears in the transmission are possibly worn out if i can further help e-mail wade at [email protected]

Tines only spin in the T position.with cutch engaged.If thats not it split the case and check to see the shift fork operating properly. Or that chains are not broke. NOTE This is a serious job!!!

Shift your Wheel gear lever to "disengage". Use the disengage position only when the engine is not running.