Hey guys. I was finaly able to go to the hangar today.
I spent the entire afternoon there and came back home at 7pm, with an empty stomach, but with a great deal of knowledge aquired.
I went there with intention of geting rid of the problem... so, a lot of things have been checked meticulously.
-Gascolator (drained)
-Fuel lines
-carb + hardware
-fuel tank cap seals
-Intake hoses + clamps
-primer line
-Carburator rod + butterfly
-Air filter
-air box + support plate / cleaning
-etc.....
Here are the reason why my engine had stumble and hesitation:
#1 - Fuel contamination.
#2 - Debris in carburator
Check picture of the water drainded from the gascolator and the debris picked up in the carb sump during drain.
Put everything back togueter, re-installed both cowlings (alone!
) and did a test run. (temp -4 deg c / dew point -7 deg c / hum. 77%).
Oil temperature came up quickly - as expected with both cowlings in place. Idle, 1700RPM mag check and 2000RPM test went great. Engine now perform as expected.
I'll make an drain extention for my gascolator that I'll poke under the lower cowling - so I can drain it before each flight. If you guys have pictures of a similar setup - I'd like to get inspired!
I didn't had enough time but next time I take off the lower cowling, I'll clean up the screen at the entrance of the carburator - I've been told it would be a good idea to do it once a year... If you guys have instruction on how to do it, I'd like to hear you. I guess with the carburator manual, I should be OK too... we'll see...
There you go, one problem solved, for now!