Specifications for the Moster 185 Plus


See the Owners manual for various specs in addition to those noted below

Engine temperatures – warm up before flying should be at least 120C (wait 2 minutes), operating range is 220ºC-260ºC.  Why warm up the engine?  It will be in a lean condition until the fuel/air mixture is fully vaporized by engine heat.  Note: it is better to keep temps well below 250ºC.  Use of a cooling shroud is highly recommended.

Ignition, coil – older models IDM #150 (same as Top 80 and Minari) – newer models have a custom Selettra coil (Bambini shown)

Ignition coil - flywheel gap adjustment for IDM coils (image is of a Selettra coil, not an IDM, but the dimensions are for the IDM).  The IDM coils have a secondary wire diameter of 5mm.

Ignition coil - flywheel gap adjustment for Selettra coils.  The Selettra coils have a secondary wire diameter of 7mm

Ignition coil primary resistance – 1.1 Ohms (but not zero)

Ignition coil secondary resistance – varies depending on the model.  5mm wire IDM is 8.2K Ohms ±10% at the coil terminal (not at the spark plug connector).  7mm wire Selettra coil is 4.75K Ohms ±10% at the spark plug terminal.  If the value is less than 4K Ohms or infinite, the coil should be replaced or, for the IDM, get the secondary wire replacement kit from Miniplane-USA.

Ignition coil resistance + OEM secondary wire resistance for the IDM coil – 17.5K Ohms ±10%.  With our secondary kit installed, the value will be 8.8K Ohms ±10%.  Note: Miniplane and Minari (as of 2018), may soon use the better ignition coil supplied by IDM or the Selettra coil.

Ignition timing – The timing is fixed with a keyed flywheel and cannot be adjusted.

Spark plug – NGK BR9ES  This spark plug is a resistor type in order to help suppress ignition noise.  The B9ES can also be used without any problems but you may notice more radio interference.  The BR9EG and B9EG are specifically designed for 2-stroke engines and will reduce fouling.  For detailed information on the types of plugs go to this page.

Spark plug gap – 0.7mm-0.9mm (0.027" - 0.035")  Always set the gap to the minimum.  The greater value is the maximum value, not the range.  It is impossible to correctly gap a paramotor spark plug without a wire-type gauge.

Starter current – 40 to 45 Amps, rarely 50 Amps. When the engine can spin freely (no spark plug installed) it should be around 21 Amps.

Timing – see "Ignition timing" above


See the torque page in the Owners Manual for the most important fasteners.

Torque values and discussion – start here if you are not experienced in torqueing fasteners or need torque values not found in the owners manual.


See the Owners Manual for maintenance intervals and what needs to be done except as noted below.

Every 100 hours