polar bear hang in there.
could be one of a number of things.
maybe the plug your using isn't hot enough.
but it is most likely the tuning.
i found with mine it was running way too rich on low side.
i have'nt lowered my tank at all and it does sit very high.

i talked to a guy at my club who lost one and the elevator horn broke off his aswell.
but i have had no problems with this on mine.
for those guy who have lost theirs i feel sorry for you.