Been racing karts over many years and I’m a mechanic by trade…carbs and tuning are my specialty…in the automotive world…but I’m new to the Mini ROK. I have it on a Benik chassis for my nine year old to start racing in Micro…it has the restricted exhaust header.
I bought the engine from a friend at our home track who just had Woltjer do an upper end rebuild and dyno. It had zero time on it when I got it since the refresh.
The engine starts easily and runs great out on the track, but it won’t idle more than a few seconds before just dying out.
It runs the best at idle with the brass idle screw almost all the way in.(1/8 turn out at the most) and the silver, idle speed screw almost all the way in! I believe the brass screw is set at a lean condition so I back it out to one full turn and have him run it. We have about hour run time on it so far with no improvement.
We have an exhaust gas temperature reading of, on average of 1065 high end and 750 low….rpm’s reach right at 13,000 maxed out. I have a large assortment of jets, needles, air bleed and tube so can probably change anything out……