Here is the DOPPLER needle cage, it is a really specific product and quite unusual, indeed DOPPLER is the only manufacturer to still offer needle cages with specific clearances. This cage is of very high quality, ultra reinforced and with improved lubrication. Size Ø12mm by Ø15mm by length 17.5mm. Longer, this cage is ideal for 70cc kite engines for example because its length allows it less play (left / right on the piston axis). Thanks to its dimensions, it will be mounted on many crankshafts such as Peugeot 103, minarelli am6, 12mm axis booster, DERBI, PIAGGIO… and many other models.
The Clearance must be selected according to the forcing on the piston pin but also according to the engine speed! In general, using the example of a crankshaft bearing, we will take a cage with very little play for an engine that takes low revs because it does not require much freedom! However, on a very high speed engine, if the cage has very little play, at very high speed it risks entering the phenomenon of seizing / overheating and risks yielding in addition to slightly restricting the engine speed.
-Game from 0 to -2 (low and medium engine speed generally 0 to 9500 rpm max)
-Game from -2 to -4 (low and medium engine speed generally 9500 to 16,000 rpm max)
Remember to choose the desired game before adding it to the cart.
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