EGIG 187 cc cylinder kit for Vespa Smallframe with 116 mm connecting rod
The EGIG 187 cc cylinder is the largest capacity version of the cast iron series for Vespa Smallframe. With a 54 mm stroke and large 65 mm piston, the result is an extremely high-torque engine that pulls long gear ratios with ease and, with the right peripherals, enables performance beyond the 30 hp mark.
187 cc
High torque
6 transfer ports
Cast iron
For powerful touring and sports setups
Technical data EGIG 187
Displacement: 187 cc
Stroke: 54 mm
Connecting rod length: 116 mm
Bore: Ø 65 mm
Transfer port: 6 channels
Exhaust: one-piece, approx. 66 % of the bore
Timing: approx. 126° / 184°
Material: gray cast iron
Piston: 2 piston rings, piston shortened by approx. 0.8 mm
Intake: direct intake at the cylinder or via housing (diaphragm/rotary slide valve)
Stud distance intake manifold: 65 mm
Stud distance exhaust: 56 mm
Power: over 27 hp and around 25 Nm possible without cylinder machining
With machining and a large carburetor, 30 hp and more are realistic
Oil recommendation: Mixed oil 1:33 (e.g. Motul 800)
Scope of delivery cylinder kit EGIG 187
EGIG 187 cylinder
EGIG 187 cylinder head
Piston d65, shortened by approx. 0.8 mm, with accessories
Intake manifold gasket
M7 cap nuts and spring washers
Screws for cylinder head and exhaust flange
Exhaust gasket
Cylinder base gaskets
Cylinder casting spacer 0.8 mm
Recommended accessories
EGIG 170/180/187 stud bolts
Shock absorber offset
Shock absorber extension
Cylinder cover spacer
Direct intake cover plate (for case intake)
Necessary modifications to the engine housing
Remove the housing edge at the cylinder base to approx. 2 mm as with the other kits.
The crankshaft housing must be spindled for the 54 mm EGIG crankshaft (180/187).
No further milling work necessary on the transfer ports.
Characteristics: maximum torque in the smallframe
At 187 cc, this kit offers the largest displacement of the EGIG cast iron series for Vespa Smallframe. The engine pulls powerfully even from low revs and allows the use of long primary ratios. Together with a large carburetor and a powerful exhaust system, the result is a very powerful, yet easily controllable engine for touring and sporty use.
Use with long gear ratios
Thanks to its high torque, the EGIG 187 is particularly suitable for setups with a long primary and speed-reducing transmission. The engine has sufficient reserves even under high continuous load, provided the carburetor and ignition are tuned correctly.
Cast iron and durability
As with the smaller kits, the cast iron material ensures high thermal stability and a certain tolerance to slight tuning errors. However, the following also applies here: A jam can permanently impair the cylinder and is not a free pass for improper tuning.
Compatible vehicles
Vespa 50 (V5A, V5B, various versions)
Vespa 90
Vespa Primavera 125 / VMA2
Vespa ET3 125
Vespa PK S / PK XL / PK XL2
All comparable smallframe engine housings with a suitable mount
FAQ EGIG 187
For riders who want to build a very high-torque smallframe engine with high top speed and stable durability and are prepared to adapt the housing for the 54 mm shaft.
The 187 offers even more torque and pulls through long gear ratios even more confidently. Both kits are similar in design, but the 187 is designed more for maximum pulling power.
Large-volume carburetors from around 30 mm are recommended for the 187 in order to exploit the full potential in the upper power range and distribute the thermal load.
Legal notice:
All EGIG Performance articles and engines are intended for exhibition purposes only. Use on public roads and race tracks is prohibited. No liability is accepted for personal injury or damage to property.
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