Engine case MALOSSI revised by KINGWELLE for crankshafts with 62/64/65mm stroke
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Brand new Malossi engine case
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Crankcase diameter spindled out to Ø100mm
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Suitable for crankshafts with 62/64/65mm stroke
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Tolerance of the bearing seat of the crankshaft bearing (limaside) corrected from -0.070mm to -0.045mm
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Recommendation bearing for the limaside: NU205 C3
Malossi engine cases are the first choice for building a powerful and reliable engine for the Vespa Largeframe models.
CURB HOUSING DIAMETER
If a crankshaft from Kingwelle with extra long stroke (up to 65mm instead of 57mm series) is used, it is necessary to increase the crankcase diameter in order to be able to mount the crankshafts with their larger cheek diameter.
LIGHT MACHINE SIDE BEARING SEAT
In the same step the bearingseat of the light machine side bearing is reworked. Malossi meant it here with the undersize for the bearing fit a little too well. 7/100mm undersize usually leads to a very tight running bearing. Kingwelle reduces the undersize to 0.040-0.045mm.
RECOMMENDATION NU205 C3
An additional recommendation is the use of a two-piece roller bearing of the type NU205 with bearing clearance C3. This makes mounting the engine halves much more comfortable than with the one-piece ball bearing supplied by Malossi.
CONCLUSION
The most professional solution for large displacement HighEnd engines with Malossi MHR187 or Quattrini 172cc cylinders. If you are aiming for performance well above 30hp, this is the perfect base.
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