Started bike fine put it in gear after warm up released clutch felt a bang 2nd gear another bang then grinding. Bike starts and runs fine shaft turns when in neutral but bike goes no where when in gear, just grinds bit.

A Sticky clutch springs to mind in that scenario.

Engine off
Put bike in 1st gear
Pull the clutch in

Can you push the bike forwards?

You can also try running the bike on tick over until the bike is fully warmed up to heat the clutch plates.

Clutch is Not releasing! needs to be adjusted properly

Instructions

1.
The 2nd gear lockout is, a mechanical speed sensing mechanism. It doesn't care if the engine is running. You bypass it by scooting the bike forward, about 5-6 mph, while shifting the transmission into 2nd gear.
2

Stand on the left side of the bike, with the ignition "ON" and the transmission in neutral.
3 With your right foot on the ground, behind your left foot: place your left foot on the left foot peg, with your toe under the shifter; squeeze in the clutch.
*4.Scoot the bike forward about 5-6 mph, with your right foot, and shift the transmission into 2nd gear, with your left foot. If you accidentally go into 3rd, or some higher gear, you can easily shift back down into 2nd, without further movement of the bike.
5.To start the bike: Apply the choke if the engine is cold. Squeeze in the clutch and push the bike forward, both feet on the ground, about 8-12 mph. Release the clutch until the engine start
6
As soon as the engine starts: squeeze in the clutch and shift the bike into neutral.

Hi, it seems you have faulty clutch from the description you made concerning the grinding noise when you tried 2nd and 3rd gear which i thinks is as a result of the stuck and scratch you had on the speed bump. And if you try riding it in its present state, you will end up damaging the gear box...

Now if your engine stalls when you drop into 1st gear, with the clutch disengaged, then the clutch plates are stuck together. Normally in this case, before starting the engine, try putting the transmission in 2nd or 3rd gear (But you already have a problem doing that which is also as a result of the faulty clutch), pull the clutch in and roll the bike forward and backward a few times to free the stuck plates. Meanwhile fresh gasoline maybe all you need..

In summary, a clutch problem....

When did this problem start? has the bike been sitting for any long period of time? any background on the bike leading to your problem would help.
questions
1. will the bike shift into gear not running all gears check it first put the bike on the center stand and rotate the rear wheel and go through the gears shifting if that is ok your good
2. shifting into gear bike running does not want to go?
grinds or lurches forward? problems from sitting for long months or yrs. sometimes when a motorcycle sits the clutch plates that are in oil will act like they are glued together ans some time can be freed after the engine oil has warmed up, in worse case you have to remove the r/h clutch cover and remove the clutch pressure plate and separate each of clutch plates and reassemble it.

If your rear wheel is locked up in first and second gear with the engine running, this is not a good sign. Have you ever ran the bike without oil in the transmission? Every time I've seen this, the chain was thrown off the bike and it busted the cases. The oil leaked out of the cases and the transmission locks up. Generally, it locks in fifth gear but it could lock up in any or no gear.

Your problem sounds like something is wrong with the low gear-second gear "clutch gear". The clutch gear is gear that slides sideways on one of the transmission shafts to engage the proper gears. If the bike will roll when in neutral, these may be the only gears affected. If the bike will not roll when in neutral, your problem may be in countershaft. Either way, the transmission could be damaged.

Now, if you're talking about the rear wheel locking up if you try to push start the bike, this is because in low and second gear, there isn't enough mechanical advantage in the transmission to overcome the engine compression. Remember, you transferring torque through the transmission backwards when you try to push start the bike. Try starting the bike using third or fourth gear instead. Standing on the pegs and dropping onto the seat when you release the clutch helps.

Your battery is most likely very flat, it has enough power to run your lights but not enought to turn over your engine to start it. Best thing to do is try to bump start it if the bike is a manual, put the bike into 2nd or third gear down a hill, get the bike rolling with the clutch in and let the clutch out when you get to good rolling speed. the bike will **** into life. Let the bike run for a good 20 mins. Battery should be recharged enough to start the bike again.
If the bike is an automatic you will have to use a battery charger.

Hi and welcome to FixYa,

Initially, if the bike will be run without its own battery, the engine will really stall. This is because there will be no consumer for the voltage output other than the ignition system which will clamp down when the engine is revved and the voltage tends to go higher still.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Check your kick stand sensor if it's unplugged then there is your problem. If it's still plugged in then the sensor might be gone. The sensor shuts the bike down if you try to take off when the kick stand is down. you can bypass the sensor by jumping the two wires before the sensor with a piece of wire connecting the two leads together. doing so will allow the bike to be put into gear with the kick stand down so always check it so you won't have an accident.

Check your kick stand sensor if it's unplugged then there is your problem. If it's still plugged in then the sensor might be gone. The sensor shuts the bike down if you try to take off when the kick stand is down. you can bypass the sensor by jumping the two wires before the sensor with a piece of wire connecting the two leads together. doing so will allow the bike to be put into gear with the kick stand down so always check it so you won't have an accident. good luck and get out ridding!