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Racing Crankshaft SIP

PERFORMANCE for Lambretta
DL/GP 125-200ccm
stroke 60,0mm, conrod 116,0mm,
pin 16mm, cone large 25mm,
polsihed con-rod, silver
bearing, incl. 2 bearings,
RACE-Tuning, for highest

For race use only. Not admitted in the area of the German StVZO!

A high-end crankshaft for Lambretta engines equipped with a DL/GP ignition.


In combination with the cylinder, the crankshaft represents the heart of every motor. It is one of the hardest working components and the conversion of the pistons stroke to rotary movement demands the highest quality and level of precision manufacture for enduring use.


A well-produced crankshaft should also be correctly balanced to reduce vibration in the motor and the oscillating masses should be kept low to facilitate an improved performance from the motor. The big end bearing rotates at the same rate as the motors rpm, receives lubrication from the two-stroke oil contained within the fuel mixture and has to convert the pistons abrupt change of direction twice during every single revolution of the motor.

The crank pin, that connects both the crank webs with the con rod, requires pressing together during assembly to a precise stiffness, to avoid the crank webs to become misaligned during operation. To enable the fuel mixture to adequately lubricate the big end bearing the lower eye of the con rod should be provided with lubrication slots.


This brand-new range of SIP crankshafts are 100% 'Made in Italy' and easily fulfil all of the above listed requirements, especially concerning the high-end quality and well-conceived constructional features. Every single crankshaft is balanced to be compatible with the stroke, con rod length and model of scooter to which it is fitted.

We have two versions of these crankshafts available. The 'Premium' models are equipped with a high end 'standard' type con rod, meaning that the surface is left untreated. This version of the con rod also possesses lubrication slots and holes for both the big and small-end bearings respectively. The 'Performance' crankshafts however have an extremely high quality con rod included. The polish it receives upgrades the surface finish, providing it with a more stable molecular structure which makes the con rod tougher and more enduring. The smoother surface finish also helps reduce the turbulence in the motor, while simultaneously saving a lot of weight. They have a gas-flowed profile and have a revised big-end design, improving the lubrication of the bearing located there.


Lambretta Crankshafts


The crankshafts we have produced for all Lambretta LI/TV/SX/DL/GP models can be distinguished by two main features: The total length of the con rod and the flywheel-side crankshaft stub diameter.


The sturdier original stub types with 25mm diameter (measured from the shaft oil seal seating) were only included with the DL/GP motor design, the smaller stub, that found use in every other models engine, narrows immediately to a paltry 21mm at the same point. This makes the fitting of the thicker DL/GP type crankshaft type obvious, if not essential, in all tuned Lambretta motors!


Almost all Lambretta models were produced including a con rod with a total length of 107mm in the motor. Only the crankshaft fitted to the Lambretta TV 175 possessed a con rod that was 116mm long, which brought with it the added advantage of a noticeably smoother running motor. In recent times many tuning cylinders have become available optionally including a piston with a reduced compression height (30mm instead of 39mm). This enables the fitting of a crankshaft with a 116mm con rod in all Lambretta LI/TV/SX/GP/DL motors.


The SIP Lambretta crankshafts are available with either a 107mm or 116mm con rod and various stroke lengths. Additionally the choice is also possible between a standard or polished type of con rod with the crankshaft assembly.


Conclusion: Very high quality crankshafts for universal operation, from high-end restoration projects all the way through to shaving lap times on the race track!


SIP - TIP: Do not forget to change the crankshafts bearings and oil seals when replacing or servicing the crankshaft!

Customers also searched for this article with:  race crankcase, racing crankcase, race crankshaft, tuning crankshaft, performance crankshaft

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Racing Crankshafts

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2.530g / piece
Stock on hand   Amount
Est. date of delivery 26.08.2019
Free shipping

Product forums
Spare Parts
icon scootermodels This product fits the following models
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
LAMBRETTA DL/ GP 125 125 22/1 2T AC 1969-1971
LAMBRETTA DL/ GP 150 150 22/0 2T AC 1969-1971
LAMBRETTA DL/ GP 200 200 22/2 2T AC 1969-1971
LAMBRETTA GP 150 SIL 150 22/0 2T AC
LAMBRETTA GP 200 SIL 200 22/2 2T AC
LAMBRETTA Jet 200 SERVETA 200 200SX 2T AC 1967-1982 DL/GP ignition necessary
LAMBRETTA LI 125 Serie 1 125 125LI 2T AC 1958-1959 DL/GP ignition necessary
LAMBRETTA LI 125 Serie 2 125 125LI 2T AC 1959-1961 DL/GP ignition necessary
LAMBRETTA LI 125 Serie 3 125 125LI3 2T AC 1961-1967 DL/GP ignition necessary
LAMBRETTA LI 125 Serie 4 125 125LI4 2T AC DL/GP ignition necessary
LAMBRETTA LI 125 SERVETA 125 125LI 2T AC 1961-1965 DL/GP ignition necessary
LAMBRETTA LI 150 Serie 1 150 150LI 2T AC 1958-1959 DL/GP ignition necessary
LAMBRETTA LI 150 Serie 2 150 150LI 2T AC 1959-1961 DL/GP ignition necessary
LAMBRETTA LI 150 Serie 3 150 150LI3 2T AC 1962-1967 DL/GP ignition necessary
LAMBRETTA LI 150 SERVETA 150 150LI 2T AC 1960-1965 DL/GP ignition necessary
LAMBRETTA SX 150 Serie 3/ X 150 Special 150 150SX 2T AC 1966-1969 DL/GP ignition necessary
LAMBRETTA SX 200 Serie 3/ X 200 Special 200 200SX 2T AC 1966-1969 DL/GP ignition necessary
LAMBRETTA TV 175 Serie 2/ SS 175 175TV 2T AC 1959-1961 DL/GP ignition necessary
LAMBRETTA TV 175 Serie 3 175 175TV3 2T AC 1962-1965 DL/GP ignition necessary
LAMBRETTA TV 175 SERVETA 175 175TV 2T AC 1963-1965 DL/GP ignition necessary
LAMBRETTA TV 200 Serie 3 200 TV3 2T AC 1963-1965,00

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