Hi Jim & Heather
As mentioned verify gauge speaks truth. As far
as reading spark plugs, it is far less accurate than measuring exhaust.
That said mogas with no lead is even less accurate than with leaded 100LL.
That said to best read spark plugs you need to use 100LL and cruise for a
while, then get the motor stopped as soon as you can to read. Pulling
power and running at different throttle setting, lower power setting and
lower RPMs will change reading. Bing, Eastwood and others sell a carbon
monoxide detectoror that would allow you check actual mixture. Depending
on your serial number of 914 rotax either has a check they want you to
make of carbon monoxide above 100%, or on any engine if you alter intake,
like installing an intercooler they want it tested on all serial
numbers.
http://www.gunson.co.uk/item.aspx?item=1835+
You can measure 1 cylinder at a time, run hose from EGT hole with a loop
going to a low point where you can put a hole to allow water to drain then
run into cockpit where you have instrument. Best verify 80% 100% and
above 100% is rich enough, then you can make sure that at 75% cruise and
less you are not excessive rich.
I have mixture ratio numbers I will
target at hangar if you or anyone else is interested.:
Quick ratio
chart here:
http://www.gunson.co.uk/items/pdf/Products/G4125_Instructions.pdf
Ron Parigoris
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