Since you say it has lots of low end power now, if you want more mid and top end power and are willing to sacrifice a little low end power to get it, you can simply remove that stock 30 lb muffler and replace it with a straight thru type.
I have a DG pipe/silencer on my wishlist but it probably won't happen until next year. I need to replace all 3 tires, rebuild the rear master cylinder and replace the air filter still. I'm not racing the thing but I do want to have fun on it when on the trails.
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Yeah I've taken it out a couple times, but not since about 2013 (we moved and it's been sitting ever since). Kick ass when coming up over a hill and pulling the front tire off the ground til the bottom of the dip!
I'm going to try and get tires ordered yet this month, along with the air filter (damn mice ).
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Ok then it really might be best if you ride it again then tell us what you would like the engine to do that is different than what it is doing now before you go buying parts you may not need. You may also just need a different silencer instead of an entire expensive pioe to get the type of power you want so changes can be made in small steps one at a time to kerp from buying unnecesssry parts.
A strsight thru silencer typically makes a fairly noticeable difference compared to a stock silencer like yours which also has a spark arrestor and the aftermarket silencers thst pipe mfgs make typically fit both a stock pipe and their aftermarket one, in which case you can spend a smaller amount on the silencer first to see how it works before spending a boat load on a complete pipe system.
Your pipe and port work will determine what carb you need.
This is for a stock stroke+stock bore (or close too) 83 250r.
Trails = 32-34mm
Built/Dunes = 36-38mm
Drag racing = 42mm
The Keihin PWK like is very nice and easy to jet. Make sure you don't end up with anything Chinese. Those things will make you leaner than a vegan.
I just wanna go fast. If your not first, your last!!
Reproducing the Tecate CDI. Contact me if you need one. I'm most accessible on FaceBook. You can find me on the 1984-1987 Kawasaki Tecate KXT250 Group.
I have never seen or used a 42mm carb on any single cylinder 2 stroke 250 no matter how much it was modified but I'm sure some people have installed them, but I would love to see a dyno sheet with the same type 38 vs a 40 vs a 42 on any model, but especially on an atc250r.
I am sure Selvy has some. Hit him up on facebook. We do it all the time to the air cooled 250rs. The last 83 I built for a customer was a 41 tmx taper bored to a 42mm. The customer here can feel free to chime in, but he would say that by the seat of the pants it was a completely different animal than with the 32mm.