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I need some baisic information

Posted: Mon Jun 09, 2008 7:20 pm
by William R. Battaglia
I am going to try to start a 1973 gt that has been stored for 20 years.
1. what weight oil should i use?
2. What should kicking cylinder pressure be ?

Posted: Mon Jun 09, 2008 10:52 pm
by BevHevSteve
use whatever you want but make sure it is SG rated. I prefer straight 50 wt. Don;t know kicking compression...... Just lube everything before riding. You will need to rebuild the carbies, lube all cables, rebuild brakes [use only DOT4 fluid] and replace the intake manifold insulators at least.

Posted: Tue Jun 10, 2008 12:31 pm
by Peter Mille
I wouldn't use DOT 4 brake fluid in this bike.
The brake system was designed for DOT 3, and although DOT 4 and DOT 3 are compatible, DOT 4 is a totally different product, and is by no way any better in quality.
To raise boiling point etc, DOT 4 is slightly "thicker", has a higher viscosity.
I would stick with DOT 3 brake fluid, to avoid possible problems, just in case....

Posted: Tue Jun 10, 2008 12:43 pm
by BevHevSteve
peter you can use whatever you like....... But as a brembo dealer, I must recommend what Brembo is now recommending which is DOT4 in ALL their brake systems, old or new.

Posted: Tue Jun 10, 2008 1:31 pm
by Peter Mille
I get it..... ;)

Posted: Tue Jun 10, 2008 8:31 pm
by wdietz186
William, Welcome to the bevel world. Ducati recommended 50 wt. oil when the bike was built. Many people run 20/50 in their 750's with no problems. The engine holds over four quarts and takes a long while to get the oil up to temp. so for most riding the 20/50 is actually a bit better as it circulates faster when cold. As for cranking pressure about 120psi seems to be what I remember as normal. But! unless the bike was stored properly, after 30yrs of sitting the cylinders will probably have rusted and pitted. Most likely you will have to pull the cylinders and perhaps rebore and replace the pistons. The valves and guides may need attention also.They are great bikes and well worth any effort to get them right.