Rotax engine exploded view: how to find the right spare part number
In short The Rotax engine exploded view is the illustrated parts catalogue: for each engine group there is a drawing with numbered parts and, below it, a table with position, part number, description and quantity for each category. To find the right part number you start from the chapter (for example chapter 3, cylinder, on the 125 MAX evo), find the position number on the drawing and read the matching row, checking the column for your category and the notes. Rows with XXX instead of a part number are parts that are not sold separately: you order the complete assembly. The DD2 has its own exploded view, with different chapters and positions.
What the Rotax engine exploded view is
The exploded view is the illustrated parts catalogue of the engine. There are two for Rotax engines: one for the 125 MAX evo family, which covers Senior, Junior, Mini and Micro, and one for the 125 MAX DD2 evo.
Each chapter covers one engine group. On the first page there is the drawing, with the parts separated and a number next to each one. On the following pages there is the table with every part in that drawing.
It is the tool we use every day in the workshop to order a spare part: with the right exploded view and the position number you do not get the wrong part.
The chapters of the exploded view: 125 MAX evo and DD2
The 125 MAX evo exploded view has 18 chapters, the DD2 one has 19. The structure is similar, but the numbering is not the same: the cylinder is chapter 3 on the MAX and chapter 2 on the DD2, because the DD2 groups crankcase, drivetrain and gearbox in chapter 1.
So before you look for a part, make sure you have the exploded view for your engine: a MAX position number does not apply to the DD2.
How to read a row of the exploded view
Every row of the table always has the same columns:
Position: the number you find on the drawing next to the part. It is the link between the drawing and the table.
Part number: the six-digit Rotax spare part number. It is what you need to order.
Description: the name of the part.
Quantity per category: on the 125 MAX evo there are four columns, Senior, Junior, Mini and Micro. The number tells you how many of that part the engine has. A 0 means the part is not on your category. On the DD2 there is a single column.
Notes: under the description you find the information that makes the difference, such as tightening torque, production year, size or usage limits.
Four rules to avoid the wrong part number
XXX means the part is not sold separately. When there is XXX instead of the part number, that part only comes inside the complete assembly. On the DD2, for example, the reed valve body is not available as a spare part: you use the complete reed valve 224380.
"Ill. no." tells you what an assembly contains. Next to complete assemblies you find, for example, "Ill. no. 20-24": the assembly includes the parts from position 20 to 24 of the drawing.
The same position can have more than one part number. It happens when the part changes by category or by production year. In that case the column for your category and the notes decide.
The same part number can have different positions. The 6206 main bearing, part number 832583, is position 06 in chapter 1 on the MAX and position 18 in chapter 1 on the DD2. The part number is what counts for ordering, the position helps you find it on the drawing.
A practical example: the reed valve
Let us see how to find the part number of the reed valve and the parts around it. On the 125 MAX evo it is in chapter 3, cylinder. On the DD2 it is in chapter 2.
Position 19, gasket 250523: one per engine, on all categories. It is the Rotax reed valve gasket.
Position 20, complete reed valve: here the same position has three part numbers. 224380 is for Senior, Junior and DD2, 224382 is for Mini and Micro, 224389 is the 2019 production version. For Senior, Junior and DD2 it is the Rotax evo 20 reed valve.
Position 21, valve body: XXX, not sold separately.
Position 22, reed petal 224431: two per engine. These are the Rotax evo 20 reeds.
Position 23, reed stopper: XXX, it comes with the complete reed valve.
Position 24, screws: the M3x6 screws 240351, six per engine, 1.5 to 2 Nm. There is also a Torx screw 241035 with the note "for reed block 224380 only".
Position 26 on the MAX, carburettor flange 267916: the Rotax 42.5 mm carburettor flange, with the M6x25 screws at 7 Nm. On the DD2, position 25 is a different intake socket, 267411.
The details of the reed valve, with measurements, checks and torques, are in our guide on the Rotax reed valve.
Same spare part, different position on MAX and DD2
If you have both a MAX and a DD2 in the workshop, be careful: many spare parts are the same, but they have a different number on the drawing.
6206 bearing, part number 832583: chapter 1, position 06 on the MAX and position 18 on the DD2. It is the Rotax 6206 bearing.
37 mm exhaust socket, part number 273190: position 31 on the MAX, where only Senior and Junior use it, and position 30 on the DD2. It is the Rotax 37 mm exhaust socket.
Exhaust socket gasket, part number 450360: position 35 on the MAX and 31 on the DD2. It is the Rotax exhaust socket gasket.
Cylinder gasket set, part number 296161: position 39 on the MAX and 33 on the DD2. It is the Rotax MAX evo cylinder gasket set. The oil seal is not in the set.
How to order the right spare part from TKS RaceLab
The quickest way is to search for the six-digit part number in the shop. If you cannot find it or you have a doubt, message us on WhatsApp with these four pieces of information:
the engine: Senior, Junior, Mini, Micro or DD2, and the year if possible;
the chapter of the exploded view and the position number of the part;
the part number, if you already have it;
a photo of the old part.
With this information we tell you straight away which spare part is right and whether it is available. For the bigger assemblies, such as the complete Rotax crankcase (chapter 1, position 01 on the MAX) or the complete engine gasket set (chapter 1, position 31 on the MAX), it is always better to confirm before ordering.
Our advice
Before ordering always check three things: the column for your category, the notes under the description and whether there is XXX instead of the part number. These are the three places where people get it wrong most often.
And when you strip an assembly, keep the exploded view open next to the bench: it also gives you the tightening torque of every screw, so you put everything back together the way it should be.
Frequently asked questions about the Rotax engine exploded view
What is the Rotax engine exploded view?
It is the illustrated parts catalogue of the engine: for each group there is a drawing with numbered parts and a table with position, part number, description and quantity per category.
Where do I find the part number of a Rotax spare part?
In the exploded view for your engine: find the chapter of the group, find the position number on the drawing and read the six-digit part number in the row with the same number.
What does XXX mean in the Rotax exploded view?
That the part is not sold separately. You order the complete assembly that contains it, shown by the "Ill. no." note next to the assembly.
Does the 125 MAX evo exploded view also apply to the DD2?
No. The DD2 has its own exploded view with 19 chapters and different positions. Many part numbers are the same, but the number on the drawing changes.
Why does the same position have more than one part number?
Because the part changes by category or by production year. For example the reed valve at position 20 has one part number for Senior, Junior and DD2, one for Mini and Micro and one for the 2019 production.
What should I send TKS RaceLab to order a Rotax spare part?
The engine and category, the chapter and position number in the exploded view, the part number if you have it and a photo of the old part. We confirm the right spare part before you order.
Sources: BRP-Rotax, Illustrated Parts Catalogue 125 Senior, Junior, Mini and Micro MAX evo, edition 04/2025; Illustrated Parts Catalogue 125 MAX DD2 evo, edition 04/2025; Rotax 2026 spare parts price list.
Questions about this topic?
Message us on WhatsApp: we answer personally, with the experience of people who live at the track. And if you want to drive a real racing kart, with Arrive & Drive you get into one of ours, ready on track. The right spare part? You will find it in the shop.
Arrive & Drive Pro by TKS RaceLab: 2026 karts with Rotax Senior MAX and DD2 engines, Alfano 7 telemetry and trackside technical support at Lonato, Franciacorta, Cremona and Ala. Message us on WhatsApp for information and availability.
TKS RaceLab | Performance Engineering Karting | tksracelab.com
Read also: Rotax reed valve → · Rotax crankshaft → · Rotax engine maintenance → · Rotax MAX torque settings → · Rotax technical scrutineering → · How to install a Rotax engine on a kart →
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Author: Sergio, TKS RaceLab | Published: 22 October 2026
TKS RaceLab is the Italian online store dedicated to karting: spare parts, accessories and everything you need to get on track. With Arrive & Drive you arrive at South Garda Karting (Lonato), Franciacorta, Cremona or Ala and find your kart ready to go. No hassle, just driving.
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