Cannot get a swing arm for my kam 125. nobody have heard of it.

You can get the Suzuki GN 125 Service Manual PDF by clicking on this link.
I hope this helps

I just ordered one through my garage and it cost 140 quid!! It must be the most expensive carb diaphragm on the market.

of course you can but it take time money and imagination.suzuki gs500e swinging arm would be a good starting point

http://www.doityourself.com/stry/9-steps-to-removing-a-motorcycle-ignition-switch

the only way to learn to swim is to dive in...find a milk study plastic milk crate to rest the bottom of the bike on and remove rear tire, bake lines everything attached to the swing arm, now you'll have to disconnect the rear shock also this can be tricky make sure it fully extended have you swing arm fully down, now just remove the bolts that hold the swing arm to the frame..if you have to remove other things to get at the bolts well nobody ever said working on motorcycles is as easy as working on bicycles its some work to accomplish whatever your trying to do especiallt the first time and you will make mistake and look around after your all done and find extra parts...that is not a good feeling especially if it a washer or bearing that you forgot to put in...i would recommend taking cell phone pictures of every step so you'll know how to do the reverse process. good luck and watch your knuckles, sometimes those bolt are on factory tight and will require breaker bars or i use long steel pipes or tubes over my wrenches after i've let it soak in liquid wrench for about an hour before i try, or you'll end up stripping it and then you'll be screwed. good luck and do me a favor if you found this the least bit helpful (i know i cant be there to walk you through it but if you can turn a wrench you can do this) please can i get a rating on my advice thanks.

that axle will really be stuck, use a good contact cleaner and s rubber hammer to push it out

I assume you dumped out the half pint of old gas and rinsed out the tank. Get a new spark plug and clean the air filter. Remove the carb and dis-assemble it then soak the parts in denatured alcohol for 30 minutes. Do not soak the rubber diaphragm. Finish the cleaning with a can of spray carb cleaner from the auto parts store. Be sure all internal fuel and air circuits are clear and that the diaphragm is not torn or has pin holes. The top cap must have a good seal. Go to www.babbittsonline.com/parts/viewbybrand/parts.aspx to see a diagram of the carb and the rest of the bike. It looks like they have lots of parts for your bike.

need a bearing removal tool, pick one up @ your dealer

If you need further help, I’m available over the phone at https://www.6ya.com/expert/michael_00678fd4800d19c5

typen fisher price in your browser then look for the link to fisher price , once on fisher price web site click on help or contact then send your request to them . for replacement parts make sure you have the model number for the swing.