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If you are having problems locating a decent replacement then it may be easier to take your original to a an automotive/ motorcycle engineering workshop and ask them if they can drill the lever part pivot area and fit a sleeve using something like a oiled bronze bushing of a suitable size or ream one out to fit your kick start lower knuckles pivot post it will cost of course but it will be like new if done well and there may be no other option available unfortunately.

@rr62If you want to paint it at home yourself then there is not much choice other than automotive 2K 2 Pack but that needs to be treated with respect for health reasons and could prove costly. if you want to keep the paint on the frame when you have sprayed it with Smoothrite it is best to leave it to cure for a week then cover the areas that you want to protect with Moto-X Grade self adhesive clear plastic sheet and use a heat gun to soften it up when you apply it or it will be hard to work with.

@DonaldwSome times the rubber throttle grip moves toward the housing and can rub on the black plastic housing that the tube turns in , there should be a large plastic washer that sits in between the grip and the housing to help prevent friction. check that there is a gap of about 2 or 3mm between the grip and the housing and if you have bar ends fitted make sure there is a gap between the grip end and throttle tube end so that it does not drag against the bar end protector. IAnother thing that may cause a sticky throttle is accumulated gunge between the throttle tube and the actual handle bar , a thorough clean of the bar and the inside of the throttle tube with something like brake cleaner will help and as a lubricant between them silicone grease , graphite powder or WD40 makes a dry PTFE lubricant spray. If you have a lot of scoring marks from trapped grit on the bar or the inside of the tube then it is best to get rid of as much as you can using wet and dry where you can. As regards your worn throttle slide yes it will cause problems but this can be countered by changing your throttle spring for a heavier spring to help the slide return along with regularly applying a little PTFE lubricant in the slide bore or if you are not on a budget just buy a new throttle slide or complete carburettor of course.

@FailMasterThese are the sprockets that work on a 125 9/43 , 9/44, 9/46 , 9/48 try them all if you can , they all feel very different. 9/48 is the most favoured because it allows you to use 3rd and 4th gear more but makes for a very short 1st gear. The technique to riding a 125 is to get the revs up very high when you need power to go up things and slip the clutch if the revs start to drop off too much. Big hill climbs on a 125cc goes like this , on the best bit of grippy ground you can start your attack from you turn the throttle wide open until the engine is screaming its head off then dump the clutch and go , but hold the throttle wide open do not back off and use body positioning and the clutch to keep control of the bike going upward , the incline of the hill will kill off the revs as you go up and you will know when it is ok to roll off the throttle by the sound of the motor when you are approaching the top. Unless you buy one of the later after 2015/2016 125cc bikes you have very little chance of having any torque at the bottom of the rev range. You can help low down power on a 125 by reducing the diameter of the front pipe where it joins on the barrel/jugg using a sleeved part made from aluminium tubing to create back pressure. check out S3 parts made in Spain. Also you can fit a flat slide type carburettor Keihin PWK 28 or a Dellorto VHST as a performance enhancer on a 125. Make sure the jetting is correct and the carburettor is tuned correctly so that you get the best response from the motor , If you do not know how to do it then all you have to do is google it. Here is a video of some good riders using 125cc bikes I cannot get this to embed for some reason so you need to click on it to see it. https://youtu.be/z6_xvCfs_l4?feature=shared