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Hey guys,

So me and my dad purchased some used parts for the TW, a shitload of stuffs and a 125 engine for very few bucks, we plan to renew everything to proper work
In this box there was a carburetor, a TK one, but different model from mine one, still I opened it and found inside a main jet 118
Mine one is a 116
I cleaned it and decided to change
Difference man!!!
Mid-High I feel more power, even in 5th gear you can feel a bit of pulling under your butt, even a bit on hill

I ordered in December some more TK jets, still waiting for arrival, but very surprised how just +2 in size made a sensible difference (driving the bike every day everything appears very clear and recognizable to me)

If you guys have a chance of changing jets I recommend it, even just +2 in size will definetely improve your overall mid-high range

Also I am still using my custom exhaust (modified KTM Supermoto one) so top speed is only about 115-120 (yes I recovered something in speed) but don't want to change again to the stock one to see that 130, acceleration is quite more fun to be honest :p

I wanted to change the pilot jet too, but without removing and turning the carburetor sideways the screw bits I have are a bit too short for this purpose, also the TK carburetor I opened has a 39 inside, I doubt is bigger than mine which is a TW200 and should be already 40 or 42 by itself, I will probably change and verify that when the Whole new set from Aliexpress will be here and also I will relace the Airbox to carburetor boot with the TW125 one being something like 2cm longer so I will get a more consistent "perfect seal"
 

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The best jetting is dependent upon operating altitude.
Plug color will help.
Also, if you are able to discern between balking/hesitation from leanness or blubbering from richness, that is a big indicator.

For the main jet, running wide open throttle, if slightly backed off and it gains speed (slightly closing throttle reduces incoming air, while the main is still sucking about the same), then it is too lean.

For the pilot, if 2 3/4 to maybe 3 turns out on the mixture does not optimize idle, then a larger pilot is needed...or there is a vacuum leak.
 
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