1968 Yamaha Daytona Laconia Mosport Racing 5-Port Power - Vintage Motorcycle Ad

Description

1968 Yamaha Daytona Laconia Mosport Racing 5-Port Power - Vintage Motorcycle Ad
Original, Vintage Magazine advertisement
Page Size: Approx. 8" x 11" (21 cm x 28 cm)
Condition: Good
Daytona.
Laconia.
port.
When we first announced 5-port
power, we got mixed reactions:
‘‘Hmm... really... good
for you ... yawn."
Since then, we've visited
a few race tracks.
(Daytona: 7 out of the first
10 places in the 250cc Race.
2nd and 3rd in the 200 Mile
Classic against machines twice
our size. Laconia: 8 out of the
first 10 places in the 75-mile
Expert 250cc Final. Mosport:
1st in both the 250cc and the
Open class.)
Suddenly, everybody’s interested.
Here’s the difference with 5-port power:
In an ordinary 2-stroke engine, burnt gases
at the top of the combustion chamber keep
the fresh charge of fuel from completely filling
the chamber. Some of the fuel goes straight
out the exhaust port.
5-port power puts two extra ports at the back of
the cylinder. Fresh fuel swirls up into the top of the
chamber (not out the exhaust). All the burnt gases are
pushed out. The chamber is completely filled with fresh fuel.
Note: Isle of Man: England world Championship
250cc Class— first place, Yamaha.
125cc Class—first place, Yamaha.
13735-AL-6809-04