Stuart's Motor
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![Greeves OULTON / GRIFFIN cylinder head](gy_hob_420top%20end.jpg)
Greeves OULTON / GRIFFIN cylinder head, barrel and piston which
now gives the bike a capacity of 420cc and increased H. P. The
barrel has a new liner with extra transfer ports and larger
inlet port but still using twin exhaust ports also larger than
standard. |
![](gy_hob_greeves%20oulton%20barrel.jpg)
The cylinder barrel showing the new liner and the extra transfer
ports
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