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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")
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.
Spark plug gap – 0.6mm-0.7mm (0.024" - 0.028") The plug should be replaced every 25 hours.
Threadlock – read this important page on threadlock and how to use it and when NOT to use it.
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
The intervals for the Minari are same as for the Top 80 with these exceptions below. 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.
Air cleaner -- disassemble, clean the element in hot soapy water if it has dirt in it. Every 3-4 cleanings, it should be replaced.
Motor anti-vibration mounts -- check to be sure they are not cracked or ready to fail. It's a mess when these things break....
Starter pulleys – these pulleys are poor quality and will self-destruct if not regularly lubricated with spray white lithium grease.