Originally Posted by Storm59

I have always been told about how reliable and easy it is to tune an OS engine.
I have 2 OS 21's an OS 21 tm and an OS 21 VG.
the TM has been very difficult to tune it runs hot all the time and sometimes very hot (300) if you get the temp down then the performance is very poor and has trouble idling.
The VG has a constant problem of flaming out. when you start it , it runs great good performance but, as soon as it temps up (210) it starts to not idle. very hard to get peolpe to work the pits for you when your vehicle is flaming out on ya.
I am very frustrated with these engines. i have an 18 tm which is very good is it the 21's or is it just me. i have had some very experienced people try to tune these engines.
i have pulled te carbs and put high temp silicone at any place i thought there may be a leak but still no cure.