adamjedgar Posted July 17, 2017 Share Posted July 17, 2017 Hi guys, Background to my issue i have a nirvana rodeo with a simonini mini 2 plus engine (200cc). It has about 100 hours on it now, and i have done virtually nothing to the motor since new (it has been very reliable). I did pull the head off once because i thought that perhaps the decompression port was blocked (i almost exclusively use the electric starter because it develops so much compression i can barely start it with the pull starter). anyway a couple of flights ago i noticed that i could not get the engine to fire when cold starting using the electric starter. I then went for the option b (the dreaded pull starter)...and since i am barely able to pull this beast using that method i was pleasantly surprised to hear a crackle and into life came the engine from barely enough revolutions per minute to consider it a decent pull. I warmed up the engine, shut it down..got out my gear and wing, put the unit on my back and she fired up with electric starter at this point no problem. Next time i went to fly the motor, which was that afternoon, same thing again...engine would not fire using electric starter when cold, i gave it a pull and away she went...shut down to setup wing and put gear on...put paramotor on my back, hit the electric starter...she fired up straight away. Third time (the following day) same as above again...no fire on electric when cold, but fired up using pull starter...shut down to setup wing, put motor on back, fired up using electric starter no problem. Fourth time, no fire electric...i accidentally broke the pull starter...no flying whilst i wait for a new part for the pull starter. the nirvana rodeo is a 16.8 volt system it has two switches, one for the starter and a second one for the ignition I have cycled and recharged the nicad battery pack I have pulled the spark plug out and checked it for spark...its not exactly the sort of spark i remember 2 stroke lawn mowers used to produce when i repaired them 20 years ago...so to me the spark seems weak. I changed the plug for another second hand one i had laying around from a different engine, it produced an identically weak looking spark and also motor will not go using electric starter (i cant use pull starter now cause i broke it and am still waiting for replacement parts to arrive) I have reset all mixtures back to the Nirvana factory defaults for this engine, 3/4 low speed and 4/4 high speed (thats 1 full turn high speed) I plan on buying a brand new spark plug as it may be possible that the old second hand plug i pulled out of an unused engine is also cactus Now to my question... Can someone help me problem solve why the simonini mini 2 plus has suddenly decided to only pull start when cold but quite happily electric starts when warm? (cranking speed seems fine but it will not even so much as fire with electric starter when cold) I will avoid putting my gut feelings out there right now as i would really like a completely fresh input into problem solving this. Quote Link to comment Share on other sites More sharing options...
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