Long story short I am running some home brew fuel through an OS70 in a t-rex 700.
(20% Methyl Easters/80% methanol) + Prosynth 5% nitro fuel (50-50 mix).
The carb got blocked recently and the engine was running erratically so stripped, cleaned and rebuilt the carb following an exploded diagram.
Back to factory settings (hi-2/mid-1/low-centre) and started working on getting the needles set.
From factory settings start with the low end adjustment.
Idle was horrendously rich and the engine was running stone cold, moved the low end leaner until it reached its maximum setting of 90 degrees. Still a bit rich on idle though?
Working through the other needles, high end needle ending up just over one turn out and mid around half a turn but the low/mid range is still overly rich and the high end is very sensitive (rich -> lean in a few clicks).
Is there a chance I have re-assembled the carb incorrectly which could cause these symptoms?
Could it be the low nitro (2.5%) is having an effect and +/- a shim would help the engine run better?
Any thoughts would be much appreciated.
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