royal star venture technical help

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Library Home Page > 1st Generation (1983 to 1993) > Engine
Concerning Antifreeze and Impellers
  Author: Archives
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Concerning Antifreeze, Impellers

I generally run around 2/3 antifreeze and 1/3 distilled water mix. This is a good ratio for the wide variation of temperatures we experience here in Canada. I drive when it is as cool as 45f, and as hot as 100 (although when it approaches 100 I generally hide in air conditioning).

Antifreeze has three primary functions. 1 It transfers heat away from the engine. 2 It protects the engine from oxidation 3 It allows temperatures above 212 without boiling. (In Canada, it also allows temperatures below 32 without freezing). (The pressure cap allows even higher temperatures without boiling) Antifreeze in concentrations higher than about 75% becomes corrosive, and may damage your engine. No one does this anyway, because antifreeze does not work properly without water.

In a southern climate, where protection against boilover is significant, the 2/3 antifreeze and 1/3 distilled water seems to work fine. I spent a month earlier this summer in Florida in blazing heat, loaded with a passenger and much luggage. On the highway at speeds over about 30mph, the needle stayed fixed on the cool side.

I am not sure what minimum ratio could be used in your Venture. I would suggest a 50:50 ratio might be the lowest that you might want to consider. The protection agents against corrosion wear out over time, and a lower amount of antifreeze would only be able to protect against corrosion for a shorter time.

You may wish to examine your impeller, which on the 83/84 was a plastic item, and on later Ventures was made of metal. I believe that the metal ones are still in stock. A number of these plastic impellers eventually failed, and Yamaha upgraded to the metal ones for 1985.

I have not "flushed" my system. It never seemed necessary. Replacing the thermostat is reasonably straight forward, and is almost the same as doing it for your car. I find it amusing that there was an extra threaded hole in the engine in this area that worked in the mockups of the Venture engine, but could not be used in actual production. I am sure you will see this threaded hole too.... Scott MacMartin -


Last update: 07:37 AM Sunday, September 26, 2004

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