Originally Posted by
TBO88
I have a new OS Speed Spec 2 . Leaning out to race settings and the motor will not go back to idle. Stays on high RPM then eventually goes down? I have taken needles out of carp and cleaned, tried different pipes,lengthened both pressure and feed lines. Took carb out and put back made sure all the way down. Big race in < 2 weeks bought this motor for HP and getting real frustrated at this time. Anybody help?
Your top needle in too Lean backoff 1/4 turn and then try run it hard for 2 mins before tune it again, Spec II has a very sensitive carby so lean it in with small inclement, The Spec II definately dont like to run hot, my engine run best at 95-100C with no shortage of power and runtime. also what pipe you are running with? that is another thing can make the engine ran hot and high idling.