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Clutch diagram manual start
Clutch diagram electric start
Engine compression – 90 psi at sea level; 4,000' MSL 80 psi. These values are approximate. Pressures are low because of the decompression port.
Engine cylinder head temperature – max 200ºC - 220ºC (390ºF - 428ºF). You will destroy the engine if you run it at temperatures higher than this
for more than a few minutes!
Engine, general information
Engine, main bearings – pulley side: KOYO 83A915-SH2-9TC4 25mm 55mm 15mm
flywheel side: ORS 6304 C3 20mm 52mm 15mm
Engine, main seals, dual lip – pulley side NAK TF 25 47 7; flywheel side NAK TF 20 47 7 – SEALS MUST BE IDENTICAL TO THE NAK TF!!
Engine, pulley – Use Top 80 clutch puller w 6mm bolts and 8mm flange nuts under the bolt heads to remove. Heat not necessary.
Engine, parts diagram (non-clutched engine)
Engine temperature, normal operating temperature 200ºC-220ºC. It is not good to exceed this temperature for more than a few minutes.
Ignition, coil – IDM #150 (same as Top 80), coil must be installed with wiring facing out.
Ignition, coil gap – 0.33mm (0.013")
Ignition coil primary resistance – 2-3 Ohms
Ignition coil secondary resistance – 8.2K Ohms ±10% (measure with a needle stuck into the secondary wire right where it comes out of the coil)
Ignition coil resistance + OEM secondary wire resistance – 17.5K Ohms ±10%. With our secondary kit installed, the value will be 8.8K Ohms ±10%.
Ignition coil to flywheel gap – 0.38mm (0.015")
Parts diagram – see "Engine, Parts diagram" above
Spark plug – NGK BR8ES (cold weather); BR9ES (hot weather) This spark plug is a resistor type in order to suppress ignition noise. The B8ES or B9ES
can also be used without any problems but you may notice more radio interference.
Spark plug gap – 0.6mm-0.7mm (0.024" - 0.028") Always set the gap to the minimum. The greater value is the maximum value, not the range.
You cannot gap the plug correctly without a wire-type gauge!
Threadlock – read this important page on threadlock and how to use it and when NOT to use it.
Timing – clutched engines 15-16º BTDC; non-clutched engines 18-19º BTDC.
Weight, dry – 24 kg (53 lb) manual start, no fuel, includes the complete Miniplane frame. Add 1.1 kg (2.4 lb.) for electric start
Torque values –
This handy page was created by Frank Hoffmann and was gathered from experience and the values given on
page EN17 of the Minari User Guide. The Minari guide is not very useful because it has too many values missing and some errors e.g.
"carter screws" should be "starter screws". Go to the Top 80 specification page and page down 2X to read the torque section if you cannot
find the value you need in Frank's page or the Minari User Guide. The Top 80 page has a discussion on torque and why different value must
be used sometimes
Use a Sharpie to write reminders on the top of the redrive (or
other semi-flat area). Any other method will not be as effective. They are easily removed/changed with mineral spirits. This way, you won't forget. You have an
hour meter/tachometer installed right?
ALWAYS check the torque of the cylinder head nuts after a few hours on new engines or engines that have had cylinder head maintenance!
Belt tension – new belts loosen up very quickly and must be re-tensioned after an hour or two use.
Consult the Minari User Guide for details on maintenance intervals and what to do.