Hi Joe. What you experience at WOT is normal for a new FG-60R3. The tolarances are still tight around the bottom cylinders while the mixture is not optimal, that's why the engine bogs down at top speed - it will take upwards of 4 liters to free-up and careful tuning.
If you take some time to read the Radial Engines thread as well, this would help explain some things:
http://www.rcuniverse.com/forum/gas-...l#post11955975
Just to give you a hint: not all cylinders fire at all tunes and all rpms. Only at the "optimum tune" will Nos 2 and 3 fire consistently (No.1 is always lean, thus does not "blubber" at all usually). Now, when at WOT the bottom cylinders start waking up, they heat up and the pistons expand - friction forces go through the roof (for an unbroken in engine) and the rpm bogs down. Tune it by temps (if possible), optimise the Low, then give it some time to free up, it will reward you.
BR,
Hector.
Originally Posted by
Joe1199
Hi guys,
ive had my Saito for a few weeks but ran it for the first time today, this is my first radial and I'm looking for some reassurance!
i started with the low needle 8 turns out, high 4 turns, it started easily and I ran it between 3800-4300rpm for 1.2 litres of fuel (15:1), after this I began to try and lean out a little, I ended with a situation where the engine runs well up to about 1/2-2/3 throttle then at WOT the revs drop and it seems to lose power, the strange thing is the high speed needle seems to have little or no effect, the engine starts easily but seems to misfire a lot on cylinders #2 and #3
i know this isn't an obvious problem I'm just trying to be as cautious as possible with the engine and I've read a lot that "the low speed needle is dominant", does this mean using it to get rid of mid-high range running problems?
also I pulled out the plugs after 1 litre and #3 cylinder appears to have done no running, it was clean, is this normal for rich run in?
thanks
joe