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JOHN W MAYO posted 09-28-2002 12:46 PM ET (US)   Profile for JOHN W MAYO   Send Email to JOHN W MAYO  
What are the additives that you can add to your fuel to help remove varnish from the carb jets for Merc 150, mod. 1500, inline six?
I possibly had a leaning problem with a couple of cylinders (aluminum on plugs). Engine sat for 3 years, after changeing the plugs and running it for about the last 150 miles i have not had that problem again.
Boat: ravenge 19,weight 1500
motor: merc 150 , 1500,
top speed is 35.5,gps......should this not be faster?
rpm:4800 max it will do.
prop: alum 17
boat and motor are 1976,.....any idea how to increse the spead or is this all it should do
Bigshot posted 09-30-2002 09:24 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Do a compression test first.
JOHN W MAYO posted 09-30-2002 03:19 PM ET (US)     Profile for JOHN W MAYO  Send Email to JOHN W MAYO     
I have previously done a compression test.
60 /125/120/125/ 15/ last cylinder unknown.
(i failed to have the engine warm when checked)
I HAVE NOT CHECKED IT SINCE I HAVE RUN THE ENGINGE MAYBE 175 MILES,....I think I have got to have better compression than it first showed now. I am suspecting I may have losened up the rings by running it.It had previously not been used for 3 years. It seems to actually be running pretty good now.
(I have change numerious wires including a coil wire with virtually 10 0/0 insualtion and added new plugs.) no plug problems.

jameso posted 09-30-2002 03:24 PM ET (US)     Profile for jameso  Send Email to jameso     
From the figures you gave, you have a couple of blown cyls, take the Bigone's advice and do another compression test.
Even if you have good compression I would like to see the cyl walls to make sure they were not scuffed while running lean.
My 02, Jim Armstrong
Bigshot posted 09-30-2002 04:36 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
You are running about 100hp with those comp #'s. Do it agian but be prepared to start looking for a new engine.
Bigshot posted 09-30-2002 04:38 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Can't look at cyl walls because these do not have heads. The only way to get somewhat of a peak is to remove the exhaust plate. I owuld not do that though.....lot of bolts gonna snap. With 15psi in cyl are in deep doo-doo.
JOHN W MAYO posted 10-01-2002 09:57 AM ET (US)     Profile for JOHN W MAYO  Send Email to JOHN W MAYO     
Thanks Jim and Bigshot...yes, i know it does not sound good. When i get back in town I will do another compression check.

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