I’ve been testing two things to try and overcome the following; Cold start/warm up stall at 1750-2200rpm Over run to gentle throttle-on stall/miss , below 2500rpm NB. My bike is stock standard and only has a UNI Air Filter. First thing; a)Spark Plugs. I’ve tried a number of different plugs including two recommend by the Brisk agent in Australia. Neither got rid, nor reduced the problems and the good old NGK CR7E was as good as any and it stayed very clean due to it being a 7 heat range. However, I have just installed the Pulstar JE2RT8 https://www.pulstar.com/buy-now/product/JE2RT8 (gap set to 0.6mm) and this has dramatically reduced #1 and #2 above. On top of this I feel the motor simply goes better!, more power and good response. The Pulstar is about 12mm taller than a standard plug and requires the COP to be supported in the rocker cover, which I did with addition of two O rings (see below). Second thing: b)Injectors. This is a simple bolt is situation, but requires removal of side covers and lifting of the air box which took 30 minutes to get to and the same to put it back together. The 0280158124 injector can deliver 10% more fuel and because I needed more fuel on cold warm-up when ECU is Open Loop or light throttle load it was perfect and when the ECU goes Closed Loop the excess fuel is reduced. To understand this click here http://www.lambdapower.co.uk/TechNotes/Tech-3.asp. Installing the 124 injector reduced #1 and #2 above to almost nil. Theses injectors are easily found on Ebay. 1)TR650 OE injector; Bosh part # :0280158058 Flow rate :237 g/min Cone(s) :Single cone 25 degree Connector :Jetronic 2)Alternative I have used; Bosh part # :0280158124 Flow rate : 261 g/min (10% bigger) Cone(s) ;Dual cone 20 degree Connector :Jetronic Alternatives below that are OE locked (you must go to franchise that sells them); 3)This injector is used the 2015 model Jeep Renegade (OE#4627652) and the Fiat (OE#55241175) sharing the 1.4 turbo Multiair engine and are OE locked. Bosh part # :0280158300 Flow rate ;251 g/min Cone(s) ;Dual cone Connector :Jetronic 4)Porsche OE # 997 605 132 91. Available only from Porsche and is OE locked. Bosh part # :0280158271 Flow rate ;310 g/min Cone(s) ;Dual cone 27 degree Connector :Jetronic At this point I have not run both Plug and Injector (#0280158124) together as I wanted to see just how much effect they had, but when I do I will post more info.