SPECIFICATIONS AND DATA

 250 250 250 250 175  175
ENGINE StilettoMX Stiletto T.T. Pioneer Plonker Stiletto Pioneer
1. Type  Two-Cycle Two-Cycle Two-Cycle  Two-Cycle  Two-Cycle  Two-Cycle
2. No of cylinders One  One  One  One   One One
3. Bore  72 mm  72 mm  72 mm  72 mm  60.9 mm  60.9 m m
4. Stroke  60 mm  60 mm  60 mm  60 mm  60 mm  60 mm
5. Displacement  244 cc  244 cc  244 cc  244 cc  175 cc  175 cc
6. Compression Ratio  12.3 to 1  13.4 to 1  12.3 to 1 9.8 to 1  13.0 to 1   10.2 to 1
7. Piston Sizes Standard   Standard  Standard  Standard  Standard  Standard
 Available  1st over (+.2 mm)  1 st over (+. 2 m m)  1 st over (+.2 m m)  1st over (+.2 mm)  1 st over (+. 2 m m)  1 st over (+.2 mm)
 2nd over (+A mm)  2nd over (+A mm)  2nd over (+A mm) 2nd over (+A mm)   2nd over (+A mm)  2nd over (+A mm)
3rd over (+.6 mm)   3rd over (+.6 mm)  3rd over (+.6 mm)  3rd over (+.6 mm)  3rd over (+.6 mm)  3rd over (+.6 mm)

 

CARBURETOR

1. Brand  IRZ IRZ   IRZ  IRZ  IRZ IRZ
2. Type  Double Needle Double Needle   Double Needle Single Needle  Double Needle Double Needle
3. Venturi  Diameter  33 mm  33 mm  29 mm  27 mm   29 mm  29 mm
4. Mid-Range Main Jet Size 76 96  * 68  **75 N/A 80 82
5. Hi-Speed Main Jet Size 115 108  * 106  **105 110 90 100
6. Pilot Jet Size 40 40  * 40  **53 48  40  35
7. Slide No. 4   No. 4 No. 4   No. 5  No. 4  No. 6

*1971 Models
**1972 Models
 

Page 147