Building a tool kit.

High quality torque wrench (inch lbs/newton meters) and some extensions

Oil filter wrench to fit Rotax filter

Oil drain pan

Oil filter cutter

Funnels-couple sizes

Full set of metric open end wrenches 8mm thru 14mm

Full set of metric sockets

Set of small metric allen wrenches

Medium size needle nose and regular pliers

Side cutters

Spark plug deep socket

Safety wire and pliers

Small and medium adjustable wrenches

Medium water pump pliers

Various small picks and an awl

Small air compressor for tires and oil purging

Tire pressure gauge

A way to jack a wheel off the ground

A set of carb synchronizing gauges

A differential cylinder compression tester with correct spark plug thread adapter

A couple of oil analysis kits, ready to use

A small spring scale for checking prop clutch friction torque

From this list, you can put together a small emergency tool kit that you always carry in the airplane.

I'm sure others will have more suggestions

IHi James - Got to give you the prize my man. Thats a terrific list. What are  "Medium water pump pliers" ?

High quality torque wrench (inch lbs/newton meters) and some extensions - Extensions come with socket set. Dont go overboard on an expensive set. I have found that a combination of digital torque adapter & conventional "click" torque  wrenches does the job.

Oil filter wrench to fit Rotax filter - The best AND most cost effective you can buy is the  Expert E117117 Adjustable

Oil drain pan - Cut the side out of a 5L plastic oil bottle

Oil filter cutter

Funnels-couple sizes - In addition strongly advocate a Mr Funnel, or similar filter funnel, for refuelling

Full set of metric open end wrenches 8mm thru 14mm - From memory a 17 & 19 mm open end spanners will also be required

Full set of metric sockets - Full set?  Purchasing a socket set that goes from about 8mm - 20 mm or there about, will likly cover most needs

Set of small metric allen wrenches - any 9-13 piece set will do the job - get the ones with a ball one end for difficult access.

Medium size needle nose and regular pliers

Side cutters

Spark plug deep socket - Some deep sockets  may be included in the socket set. 

Safety wire and pliers

Small and medium adjustable wrenches - Good to have "plumbers tools" but only use as last resort

Medium water pump pliers - ??????

Various small picks and an awl

Small air compressor for tires and oil purging - Small? A 12 V compressor will be sufficient for tyre pressures however a much larger compressor will be needed to deliver sufficient air volume at say 10 psi, for effective  oil purge procedure.

Tire pressure gauge

A way to jack a wheel off the ground -  Most hydraulic jacks will not fit under the axle of a small aircraft. You can purchase dedicated jacks from people like Peter Anson Engineering https://www.ansoneng.com/ or modify a small automotive scissor jack (wreckers yard)

A set of carb synchronizing gauges - Cheap Motorcycle twined vacuum synchroniser gauges will do the job very well - need to purchase extra pneumatic tubing

A differential cylinder compression tester with correct spark plug thread adapter

A couple of oil analysis kits, ready to use

A small spring scale for checking prop clutch friction torque

From this list, you can put together a small emergency tool kit that you always carry in the airplane. - The "away" kit will likly need to duplicate some of the home tools.

I would add:

Automotive spring hose clamp tool

Small "Vise Grips" - occasional use only. I have a small straight jaw set, that I use (with jaws coved by tubing) to squeeze shut the balance tube when doing carburettor balance.

A selection of flat blade and Philips head screwdrivers.

Dynon instruments (in my aircraft) use a small Torx head screws, so Torx drive needed (came with 1/4" socket set) 

Cheap Multi meter 

Then there is a long list of consumables eg Loctite products (much of this is listed in Rotax Service Manual) Purchase as needed as some have limited shelf life.

NOTE: If airframe originated in USA, then a parallel set of imperial tools will also have to be acquired😈

Hi Jason,

If your airframe comes from the USA, you will also need a parallel selection of imperial tools for almost everything, from the engine back.😈

And you could add…

Socket type metric Allen set, for use with a torque wrench. 

Medium JIS screw driver (for some carburetor screws)

Medium Posi-Drive screw driver (for some carburetor screws)

Second smaller torque wrench (inch lb) for lower torque values such as AN flare fittings.  

This should help you get started;

Rotax Tool List

1. Screwdrivers: All sizes and tips
2. Spark Plug Gapping Tool
3. Spark Plug Thermal Paste
4. Feeler gauge
5. Measuring tape and Metric ruler
6. Gram Scale
7. Digital Fish Scale
8. All types of pliers. Big and small + 12” Long Needle Nose Pliers
9. Hose cutter, Sharp smooth blade
10. 3/8” Torque Wrench
11. 1/4” Metric socket set + Plus standard Sockets
12. 3/8” Metric Socket set + Plus standard Sockets + Deep Sockets
13. Small metric Open End Wrenches + Standard Wrenches
14. Standard Size Metric Open end Wrenches + Standard Wrenches
15. 6” Metric Tee Handle Allen Head Wrench’s + Standard Wrenches
16. Small (90 Degree) Metric and Standard Allen Wrenches
17. 3/8” Socketed Metric Allen head Bits
18. Oil Purge Kit
19. Butane Torch
20. 12” Digital Level for prop
21. Rotax Crankshaft Locking Pin
22. Assorted Metric and Standard 1/4” Bit Set for 1/4” Drive socket set
23. Flashlight
24. Dremel Tool Battery Operated + reinforced cutoff Wheels
25. Volt Meter and Tester
26. Soldering Gun
27. Wire Connector Crimping Tool
28. Differential Compression Tester
29. 7” & 11” Plastic Wire Ties
30. Assorted Clamps and Clamping Tool
31. Carb Sync Gauges
32. Small Tube of Loctite 243 (medium blue) and Loctite 648 (green sleeve retainer)
33. Safety Wire. .032 and .041
34. Safety Wire Pliers
35. Oil Filter Pliers or Wrench. (get the wrench)
36. 12mm Spark Plug Thread Chaser
37. Torx Head Bits
38. Ear Muffs and Goggles
39. Metric Tap & Die Set
40. Box Knife & Scissors
41. Silicone Paste (Dielectric Grease)