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Version 1 25 January 2017 EMR

Motorsport South Africa

SOUTH AFRICAN KARTING COMMISSION

HOMOLOGATION SCHEDULE MAXTERINO MX-60

Version 1 2017-01-25

MSA Ref.

Manufacturer MAXTER S.R.L.

Distributor Ed Murray Racing cc

Model Maxterino

Period of homologation 31 December 2016 – 31 December 2019

PHOTO OF ENGINE – PINION SIDE PHOTO OF ENGINE – IGNITION SIDE

Signature and Stamp MSA Signature and Stamp Distributor


TECHNICAL INFORMATION

A

DESCRIPTION

Tolerance

Maximum Capacity 60cc

Bore 42,1mm Stroke 43mm +/- 0,10 mm.

Induction Piston Port Cooling Free Air

Carburator Mini Kart Del’Orto PHBG18BS Diameter 18,00mm. No modifications at all. Needle marked W23 only. Only adjustments permitted are: main jet size, needle clip position and idle air screw open. Original floats: 4g, Idle jet: 50, Emulsion tube: 262AU and spring type needle, Starting jet: 60;

Number of Transfer Ports 2

Ignition and timing Original Seletra analogue ignition Width of Exhaust Port 28,00 mm. +/- 0,10 mm.

Width of Inlet Port 26,00 mm. +/- 0,10 mm.

Overall Piston Height 49 mm. +/- 0,8 mm

Piston Mass 61 g including ring. Only original Maxter spare parts with no modification. Material may be removed from the lower edge of the skirt only to achieve correct inlet duration. NB. Minimal corner break to remove sharp edge only as per original part. NB. Piston size must not be removed and visible (carbon removal permitted)

(+/- 10% of the total) Sizes 41.86 Max 41.98

Total weight of crankshaft including the conrod excluding the piston

1362 g (+/- 3% of the total)

Shape of combustion chamber Hemisphere as per MSA gauge, no polishing. MSA gauge must fit with no clearance on sealing surface. Spark plug leg of gauge may not protrude above sealing face of spark plug.

Squish Clearance 0.6 mm. With 1.6 mm. resin core solder at smallest point

Minimum

Spark Plug NGK BR10EG / NGK B10EG Pinion Z11

Sprocket Z80 - Z86 all included Clutch Original parts only, no modifications, as per drawing.

In the interests of standardisation and to ensure spare parts availability, it was decided to allow the CIK KF clutch going forward. These CIK clutch complete assemblies weigh a minimum of 800g and the inner hub 345 +/- 15g. The drum inside diameter may not exceed 85.40mm on these clutches. The earlier model original Maxter clutch is also permitted until further notice NB maximum inside diameter of these drums is 84.70mm. All of the original clutches offer exactly the same performance.

Seal Rotax serial numbered seal, as per photo. Sealed through two cylinder nuts


B

PORT TIMING (measured with 0.20 mm. feeler gauge 10 mm. wide)

Tolleranze

Inlet 144° Maximum

Exhaust 156° Maximum

C

Material

Cylinder Alluminium casting with CNC machined cast iron liner No grinding or polishing allowed

DEVELOPMENT OF CYLINDER

Airbox and filter Only original type as supplied complete with functioning air filter is permitted. It is permitted to drill a single 8.0mm maximum diameter hole on the lower side near the front to drain water in the event of rain.


SECTION AND PLAN OF COMBUSTION CHAMBER

HEAD GAUGE MSA MX-60 MUST FIT WITH NO LIGHT ON SEALING FACE

CRANK SHAFT V1


PHOTO OF CRANKSHAFT V1

CRANK SHAFT V2


PHOTO OF CRANKSHAFT V2

PHOTO OF RIGHT HAND SIDE PHOTO OF LEFT SIDE


PHOTO OF REAR VIEW OF THE ENGINE PHOTO OF THE FRONT VIEW

PHOTO FROM THE TOP CYLINDER HEAD

PHOTO OF THE MOTOR FROM THE UNDER

SIDE


PHOTO OF THE CYLINDER BASE

PHOTO OF COMBUSTION CHAMBER

PHOTO OF INSIDE OF CRANKCASE

PHOTO OF INSIDE OF CRANKCASE


MINIMUM DISTANCE FROM CENTRE LINE OF CYLINDER TO CENTRE LINE OF INLET

MANIFOLD


EXPLODED VIEW OF COMPLETE CLUTCH


PHOTO OF SEAL


PHBG 18BS CARBURETOR SPECIFICATIONS: Note: Please note that there have been NO changes to the carburetor specifications. This document is used to clarify that the Standard homologated carburetor and jets have not been modified. Also, no machining or drilling of jets is allowed to be done on the carburetor and its internal parts. The carburetor must remain standard as supplied by the Maxterino Importer. The importer / Technical Consultant also has the right to supplier competitors with new jets should it be required. This is a working document and will be updated as and when required. The responsibility is on the competitor to check that the carb meets the required specification. Carburetor Specifications for all South African 60cc Maxterino classes for 2017 and beyond. CARBURETTOR DELL’ORTO PHBG 18 BS

1. Throttle Valve Slide = 40

2. Mixture Needle = W23

3. Atomiser / Emulsion Tube = 262 AU

4. Idle Diffuser = 50

5. Starter Jet = 60

6. Main Jet = Free

7. Needle Valve Diameter

8. Float = 4g

9. Air Screw

10. Surge Plate (Pg 2) = Compulsory

A. Other Dimensions

B. Other Dimensions

D. Emulsion Tube / Insert Height dimensions (MAXTERINO)

E. General

Measuring of components:

Some components will be measured with aid of a vernier. Measurement of Diameters:

Diameters of jets / holes will be measured using GO / NO GO gauges.

Special Tools / Drill bits will be used to measure some holes and used as GO / NO GO gauges.

These gauges will be verified with use of a 0-25mm micrometer.

“GO” Gauge will be required to slide into the required hole. “NO GO” Gauges must not be able to slide into the required hole.

Should a part be found to be out of spec, it will be impounded for further measurement if required.


0


1. Throttle Valve Slide (40)

1.1 Length of Throttle Valve Slide Spec: 27.50mm ± 0.15mm

1.2 Length of Cut Away to the top of the Throttle Valve Slide Length of Throttle Valve Slide Spec: 23mm ± 0.25mm

1.3 Length of Cut Away to the top of the Throttle Valve Slide

Length of Throttle Valve Slide Spec: 23.4mm ± 0.15mm

Surface Finish: Cast

1.1 1.3 1.2

2. Mixture Needle Maxterino (W 23)

L

2.1 Table of Needle Specifications as per Supplier Chart (Dellorto)

(Also as per Master Sample W23 needle from the Maxterino Importer) 2.2 The Technical Consultant may also compare the needle to a master sample supplied by the

Maxterino Importer. 2.2 There must be 1 mixture needle stop (Circlip, #13 on page 2) fitted to the needle. 2.3 No Washer is permitted to be fitted either above or below the circlip. 2.4 Note: The marking “W23” on the needle does wear off after a period time. It is the respon sibility

of the competitor to ensure that if the marking wears off, that the needle is replaced with a new one.

Type Value

X

Characteristic expressed in millimeters

ØA ØB C ØD E F L

W23 23 2.5 ±0.03 0.6 ±0.05 (26 ±0.5) 2.5 ±0.03 - - 45 ±0.2

Measured right at the tip

Reference Dimension


4.

2.5 Should the technical consultant inspect a needle that the marking is worn off; the needle will be

checked with reference to the specification above and / or a master sample. The needle will then be impounded by the TC and the competitor will be required to fit a new needle.

2.6 Wear marks towards the tip of the needle, where the needle goes through the emulsion tube is common. The needle should be replaced if wear is excessive.

4. Atomiser / Emulsion Tube (Maxterino) (262 AU) With aid of “GO” / “NO GO” Gauges the internal dimensions of the emulsion tube will be checked. This will be verified by inserting the gauge into the hole. The “GO” gauge MUST GO through the hole; the “NO GO” gauge MUST NOT GO through the hole.

4.1 Length of Emulsion Tube Spec: 34.75mm ± 0.30mm

4.2 Length of Nozzle tip to seating face Spec: 26.00mm ± 0.20mm

4.3 Internal Diameter from side 3.2 GO Spec: 2.60mm (GO) NO GO Spec: 2.64mm (NO GO)

4.1

4.3

INSERT

4.4 Length of Insert Spec: 14.00mm ± 0.30mm

4.5 Shroud Height Spec: 2.00mm ± 0.15mm

4.6 Flange Thickness Reference Dimension: 1.00mm

4.7 Bottom of Flange to Base Reference Dimension: 11.00mm

4. 3

4.5

4.6

4.8 Hole Diameter Spec: Dia 3.90mm ± 0.20mm

4.9 Cut Away dimension

4 4.7

4.

8

Spec: 4.50mm ± 0.20mm

4.9


5. Idle Diffuser (50)

With aid of “GO” / “NO GO” Gauges the internal dimensions of the Idle Diffuser will be checked. This will be verified by inserting the gauge into the hole. The “GO” gauge MUST GO through the hole; the “NO GO” gauge MUST NOT GO through the hole.

5.1 Length of Idle Diffuser

Spec: 9.50mm ± 0.20mm 5.2 Internal Diameter of Smallest hole inside the Idle Diffuser

GO Spec: 0.5 mm (GO) NO GO Spec: 0.55 mm (NO GO)

5.1

5.2

6. Starter Jet (60)

With aid of “GO” / “NO GO” Gauges the internal dimensions of the Starter Jet will be checked. This will be verified by inserting the gauge into the hole. The “GO” gauge MUST GO through the hole; the “NO GO” gauge MUST NOT GO through the hole.

6.1 Length of Idle Jet

Spec: 27.00mm ± 0.25mm 6.2 Internal Diameter of hole inside the Start Jet


6.3 4 holes, 90° apart GO Spec: 1.00 mm (GO) NO GO Spec: 1.10 mm (NO GO)

6.2

6.1

6.3

17


7. High Speed Jet / Main Jet The anti surge plate fitted between the emulsion tube and the main jet may NOT be removed. 7.1 Length of High Speed Jet / Main Jet

Spec: 8.0mm ± 0.3mm 7.2 Internal diameter of main jet.

Spec: Free

7.2

7.1

8. Needle Valve

With aid of “GO” / “NO GO” Gauges the internal dimension of the Needle Valve will be checked. This will be verified by inserting the gauge into the hole. The “GO” gauge MUST GO through the hole; the “NO GO” gauge MUST NOT GO through the hole. 8.1 Internal Diameter of hole inside the Needle Valve


8.1


9. Float

9.1 Weight of Float

Spec: 4.0grams (As marked on the bottom of the float)

10. Air Screw

10.1 Diameter of Air Screw Orifice.

GO Spec: 1.10 mm (GO)

NO GO Spec: 1.3 mm (NO GO)

10. 1

9.2: Diameter of tip end: 0.9mm ±0.05mm

9.3: Diameter of tip: 1.2mm ±0.05mm

10. 2

10. 3

9.4: The Air Screw must be fitted with O-ring, washer and spring as illustrated.


A Other Dimensions

With aid of “GO” / “NO GO” Gauges the dimensions will be checked. This will be verified by inserting the gauge into the hole. The “GO” gauge MUST GO through the hole; the “NO GO” gauge MUST NOT GO through the hole.

A.1 Diameter of Throat.

The throat diameter must be checked from both sides of the carburetor. Spec: 18.0mm ± 0.05mm



A.2 Diameter of hole A2 as illustrated GO Spec: 1.00 mm (GO)


A.3 Diameter of hole A2 as illustrated GO Spec: 2.50 mm (GO)


A.1

A.1

A.2 A.3

B.1 Diameter of hole B1 as illustrated



A.2 A.3

B.1


B.2 Diameter of hole B2 as illustrated



B.2

ITEM D IS ONLY FOR REFERENCE UNTIL FURTHER NOTICE

D Emulsion Tube and Insert Protrusion (MAXTERINO)

Special Tool XXX will be required to measure

dimensions.

Dimensions are from the centre line of the 18.00mm

Bore.

C1 Spec: 8.70 ± 0.4mm

C2 Spec: 7.50 ± 0.4mm

B.2

C.2

C.1

23 V1 25 January 2017 EMR

E General

The over flow nipples may be turned in any direction

An overflow pipe may be fitted

Some carbs have a brass insert fitted inside the overflow tubes (Supplied from Dellorto) on the inside of the

carb. This is to prevent “Break through” of internal channels and is permitted.

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