When i put the bike into gear it will not move. You can hear grinding from the rear. Any ideas?

A grinding noise when you put the motorcycle into gear and it doesn't move could indicate several issues with the final drive on your Suzuki Intruder. Some possible causes are:

1. Worn or damaged clutch: The clutch may not be engaging properly, preventing power from reaching the rear wheel. A worn or damaged clutch can cause a grinding noise when you try to shift into gear.
2. Faulty gear: The gears inside the final drive may be worn or damaged, preventing them from meshing together properly. This can cause a grinding noise when you try to shift into gear.
3. Low or contaminated gear oil: Low or contaminated gear oil can cause excessive wear on the gears inside the final drive, leading to a grinding noise and reduced performance.
4. Failed final drive: A failed final drive can cause a grinding noise and prevent power from reaching the rear wheel.

If you are not familiar with motorcycle repair, it is recommended to take the bike to a qualified mechanic to diagnose and fix the issue.

First thing to do is check your oil levels. I'm not sure if that bike uses a separate transmission oil. Low oil can cause strange noises when in gear.
Can you be more specific about the noise? Is it a metal against metal sound? Is it a rattle or a smooth noise? Does it disappear between gear changes, when you pull in the clutch?
Check the easy stuff first. You don't need tools fo these checks. If it has a centre stand raise it onto that. Get a helper to gently put some weight on the back of the bike to raise the front wheel off the ground. Spin the front wheel by hand and listen. You should only be able to hear a very quiet gritty noise from the front brake. Spin the front wheel a bit faster and check it's spinning straight and true.
Get your helper to move to the front of the bike to raise the rear wheel off the ground. Put the bike in neutral, spin the rear wheel and listen. There should be two different, quiet noises. A gritty one like the front wheel and a quiet rattle as the chain moves through the rear wheel sprocket and transmission sprocket. Put the bike in gear and pull in the clutch so the wheel will turn. Spin the wheel again and listen to see if the noises change. Lastly spin the wheel faster and check it's lined up and spinning straight and true.
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If the kickstand switch stays/fails open, with the bike in gear it will die ... Do you hear the fuel pump spin up when you turn on the bike? ... up... if they have clean them up, check the gaps and try again.----------------------------------------------------------------------------------------
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make sure the linkage is adjusted right

Did you check the fluid level in the rear end?

It could be the clutch needs adjustment or the reverse syncro is not there or needs to be replaced. good luck.

Put bike on center stand or lift rear wheel. Put cycle in gear and see if the rear wheel turns. Is there grinding in the final drive? check final drive oil for metal chips. Pull the rubber boot back from the motor to the swing arm to check if the shaft universal joint is broken. If final drive and shaft are OK then dump the engine oil into a clean pan, take the pan out into the sun light and check for metal chips there.

I believe you can see the actual shaft for the shaft drive spin. If you start the motor and put it in gear and see the shaft spinning the problem is a stripped pair of gears in the final drive. Compare the cost of the pieces (plus labor) to the entire assembly, the assembly will probably be cheaper. If you can not see the shaft just check the oil in the final drive for metal chips. A worst case scenario , your engine case has metal chips ( That might cost more.).

most common cause is rear pads sticking (rust) and when you move, it has to break the rust from the rotor,hence the grinding noise.as long as it only does it when you start moving or turn first thing do not worry.....

possible crank bearing failed and incorrect adjustment on the clutch cable or the clutch it self