Cagiva Mito 125 Owners Blog : Cagiva mito 125 Cylinder Barrels , Cylinder heads and exhaust information

Cagiva Mito 125: Cylinder Barrel & Head Identification Guide

One of the most confusing aspects of restoring or tuning a Cagiva Mito 125 is identifying which cylinder barrel and head combination you have. Over the decades, Cagiva produced several versions—ranging from the early 7-speed Mk1 models to the final SP525—each with unique port timings and combustion chamber shapes.

Using the wrong piston-to-cylinder combination or mixing incompatible heads can lead to poor performance or catastrophic engine failure. Use the codes below to identify your setup.

Common Cylinder Barrel Codes

The identification code is usually cast into the side of the barrel, near the base or the exhaust port.

73037: The "Standard" Evo barrel found on many 6-speed models from 1994–1999. Known for reliable power and good port timing for street use.
66650: Found on earlier 7-speed Mito models (Mk1/Mk2). Often sought after by tuners for its aggressive porting.
72666: Another common variant often seen on late-model Evos.
A0401: Typically associated with the modern SP525 models. Designed to meet stricter emissions standards while maintaining the 125cc displacement.

Cylinder Head Identification

The head must match the piston crown profile (Flat Top vs. Domed).

200H: Designed for Flat Top pistons. This is the most common "Full Power" head for modern Evos.
200C / 200G: Often found on older 7-speed models, these are typically designed for Domed pistons.
SP Heads: Rare, high-compression heads used in the "Sport Production" racing series. These require precise squish-band measurements to run safely.

Crucial Matching Rule:

Flat Piston = 200H Head Domed Piston = 200C/G Head Mixing these up will either result in zero compression or the piston hitting the head!

Myth naked '89, '90 Denim Mito, Mito '90-'91 - 60431 60433 54888 54946

Mito Lucky Explorer '91 Myth: Eddie Lawson '92 - 67131 66650E 54888 64818

'92 Myth II, Myth II: Lucky Explorer '92 - 72970 72625 54888 72642

Myth II Sp '91-'92 - 72666 72626 72627

Myth II Replica '93 (all versions), Myth II: Evolution '94;
'94-'98 Mito Ev, Ev Mito Lucky Explorer '96 - 73034 73037 72626 73038

Myth II Sp '93,Mito Ev SP '94 - 75622 75666

Mito Ev SP '95-'96 - 81781 81782 81982 81785

Mito Ev SP '97-'99 - 90206 90087 91876 81785

Mito Ev SP 2000-2001 - 97741 90087 96963 96884

Mito Ev 1999-2007 - A0400 A0401 A0402 64818

Mito SP525 2008 -.... A0400 A0401 A0402 A8668

32mm exhaust port hole,6-port, height 91mm 60433 '89~'92 ('93 at Freccia FY)
35mm exhaust port hole,8-port, height 91mm 66650 '90
35mm exhaust port hole,8-port, height 91mm 66650 Europe '90~'94
35mm exhaust port hole,8-port, height 91mm 72625 '92~'94
35mm exhaust port hole,8-port, height 91,90mm 73037 '94~'98
35mm exhaust port hole,8-port, height 91,90mm A0401 '99~'2010

60433 - MK1 - Transfer 124deg, Exhaust 192deg, 33mm ex port, 6.3:1 Compression ratio corrected (with appropriate head & dome piston)
66650e - Mk1 Racing - Transfer 124deg, Exhaust 194deg, 35mm ex port, 7.6:1 Compression ratio corrected (with appropriate head & dome piston)
72625 - MK2 - Transfer 125deg, Exhaust 190deg, 35mm ex port, 8.2:1 Compression ratio corrected (with appropriate head & dome piston)
73037 - MK2 Rep/Ev1 - Transfer 130deg, Exhaust 190deg, 35mm ex port, 10.2:1 Compression ratio corrected (with appropriate head & flat piston)

A0401 - Ev2/SP525 - Transfer 124deg, Exhaust 188deg, 35mm ex port, 7.1:1 Compression ratio corrected (with appropriate head & dome piston)

Cagiva mito 125 Cylinder Barrels , Cylinder heads and exhaust information

75666

72625

66650

60443

Cagiva mito cylinder heads

click here for Cylinder heads listed on ebay now

200A - dome

200C - dome

200G - dome (smaller squish)

200H - flat

200L- sp dome

200M - flat, original Mito EV SP (race only)

200E - dome

200N - dome (SP525)

200D - dome (Planet)

200h is for flat top piston normally 1 ring, but i have seen twin ring flat top pistons for sale.

200c is most common for dome top twin ring.

Then u have 200g which is also for dome top twin ring but maybe used on taller cylinders, or to gain more squish if needed.

200m etc all for SP where the O rings sit inside the cylinder and not the head.

Cagiva mito Exhausts

see if the exhaust you need is on ebay now

Blades" mk2 Lucky Explorer:

Silencer black carbon (same as Evo's CRC silencer) 68091

Exhaust :

RH-side *Cagiva 68090*

LH- side 8000-75642

Evo mk1 '94~97 :

Kevlar silencer: Cagiva 68091 DGM 50978-S ??

Exhaust:

RH-side Cagiva 68090 DGM 50978

LH-side 8000-77925

Evo mk1 '98 Lucky Explorer:

Kevlar silencer: Cagiva 78335 DGM 54458-S .

Exhaust:

RH-side Cagiva 86587 DGM54458-S

LH-side 8000-86587

Repairing a Cagiva Mito End Can silencer

Here is an alternate way of repairing an end can if the carbon-kevlar tube is not totally junked and replacing is not mandatory.

The part of the damaged tube must be removed. I would still be comfortable if the rest of it is 20cm in length at least. Use a piece of thick sandpaper to mark your cutting line. Any metal saw will do the rest of the job.

The same length should be removed from the perforated pipe.

And then welded back in again if necessary.

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Piston to barrel clearance

something everyone should have in his toolbox. Piston fit fillers are cheap and very useful. You will need 0.002, 0.0025 & 0.003 inch feeler gauges as these will cover most of your needs.

you can pay up to £400 for a set of feeler gauges not what id pay but you can if you want me i bought the ones below in link not that expensive but not cheap .