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Old 10 December 2014, 12:41   #11
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Originally Posted by uncle al View Post
If it was my engine ,I would run it on a 50:1 mix all the time. as for running it in ,
Dont over rev it,
Dont let it labour
Dont rev it up over 1,200 rpm out of gear.
Given your expertise on these OBMs I'll take that as definitive!
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Old 10 December 2014, 12:46   #12
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Here is an old Yamaha running in procedure from 1980. As you have rebuilt your engine I would dispense with the 25:1 unless your engine was an old 50:1 model, but I doubt it.Click image for larger version

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Old 10 December 2014, 13:06   #13
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Brilliant - thank you!

That graphic is a great way of showing things too.
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Old 10 December 2014, 13:08   #14
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So here's a bit of wisdom!

1) 1974 - You use a "babe" to advertise your wares to the dizzy heights of 25hp.
2) Your 25hp has no through hub exhaust and is 1:50.
3) By 1983, your 30hp is now through hub and 1:100.
4) Here's the Bombshell. We can only run our old Yamaha's on 2 Star Petrol!!

Shows how much I read the specs!!

All yams ran on 4 Star and Unleaded, so I don't quite know where that came from. Cheaper running or appealing to countries with lower octane fuel.

Bizarre!!Click image for larger version

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Old 10 December 2014, 15:13   #15
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Quote:
Originally Posted by RIB-Teccie View Post
So here's a bit of wisdom!

1) 1974 - You use a "babe" to advertise your wares to the dizzy heights of 25hp.
2) Your 25hp has no through hub exhaust and is 1:50.
3) By 1983, your 30hp is now through hub and 1:100.
4) Here's the Bombshell. We can only run our old Yamaha's on 2 Star Petrol!!

Shows how much I read the specs!!

All yams ran on 4 Star and Unleaded, so I don't quite know where that came from. Cheaper running or appealing to countries with lower octane fuel.

Bizarre!!
"Get that woman out of the way - I want to see the [engine's] lower unit!"
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Old 10 December 2014, 15:41   #16
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Clearly a photobomb from 1974
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