O.S. Speed 21XZ-B Ty 110% Combo (L-OS1217E)
This special 21XZ-B edition motor was built to Ty Tessmann’s custom requirements in order to help him win of the world championships. Based on B2101, the heat sink head has a refined design for improved cooling during a race on Ty’s request. It also uses a newly adopted 5.8mm reducer to improved fuel efficiency making a crusial difference over a long race. This combo set includes a matched exhaust set using a newly designed 90mm long manifold to give Ty the best fuel economy and a reliable stable idle to suit his tough racing requirements.
• 5.8 mm carburettor reducer for improved fuel consumption performance.
• This combo set adopts a 90mm long manifold, for fuel economy and improved idle.
• Silver anodized finish heat sink head designed exclusively for Ty Tessmann.
• Crankcase & crankshaft with laser etched Tessmann logo.
| Specifications | |
|---|---|
| Weight | 356g (12.59 oz) |
| Displacement | 3.46cc (0.211 cu.in.) |
| Bore | 16.4mm (0.646″) |
| Stroke | 16.4mm (0.646″) |
| Power Output | 2.65 ps (2.61 hp) @ 34,000 rpm |
| Practical RPM | 4,000 – 42,000 rpm |
