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Many of you have recommended that I replace the "overlong" 21 #pinion with a #standard #pinion. But how many teeth did the 250 TS have from the factory? Was it 19 or 20 teeth? The literature and data sheets make different statements here. Regardless, we'll try 19 teeth now. Setup: 300 cc carburetor BING 84 Main jet 125 Idle jet 55 Air filter standard (new) Exhaust standard Manifold shortened by 4 cm Vape Powerdynamo 12V / 150W Ignition timing 3.00 mm before TDC Pinion 19 teeth