Hello and good day. Here’s a little update to my jetforce. I bought this as in another post already mentioned as a construction site and prepared it so far that it starts. Said construction site only jumped with start help spray and then drove then also first. So I put myself on and first air filter, carburetor, suction tracked & membrane removed. Intake tracked and membrane were absolutely scrap and porous, that was valid for the seals. The carburetor absolute Kata strophe and without any chuke. Of course he didn’t want to. Have bought these parts also all together new. The compression is at 9.05 bar,should be more than sufficient. Now everything is installed and after 500 times kicking the carburettor had also decided to run full and start the engine. Engine also runs great. My problem is now, it jumps well at very good even, accelerates absolutely top,BUT ….. Only until it is warm, then up to about 25 30 kmh afterwards He goes to his knees in terms of speed, engine is smoked duller and he takes forever until he has reached his 45 50 kmh. Now my guess is that the carburetor of Dellorto 17.5 is the cause. Have left everything that belonged to the carburetor or delivery so and built in. My question would be he gets too much or too little sprung? Or what could be the cause? New: Spark plug spark plugs plugs carburetor + membrane + suction track Related seals.