TravelinJavelin 620 #1 Posted August 9, 2017 on my 953 hasn't been run since 2011 and so when I first started it smoked like heck then thinned out to a almost whitish color which goes back and fourth to light blue to the whitish color what do you think is going on in there? fresh 93 octane fuel , oil has been changed 30W so is it rebuild time? Share this post Link to post Share on other sites
Electro12WH 50 #2 Posted August 9, 2017 I would run some Seafoam first. Maybe MMO in the oil. Share this post Link to post Share on other sites
TravelinJavelin 620 #3 Posted August 9, 2017 ok not sure what MMO is but I happen to have sea foam do I put in the tank or the crank? Share this post Link to post Share on other sites
oldredrider 2,548 #4 Posted August 9, 2017 MMO= Marvel mystery oil. You probably have stuck or sticking rings. You can add MMO to both gas and crank case. Get you some! 3 Share this post Link to post Share on other sites
TravelinJavelin 620 #5 Posted August 9, 2017 10-4 on the marvel mystery oil .....I've heard great things about it, my grand father swore by it but I never tried it ok I will have to get me some now I have one other question to do a compression test on this i'm told you got to run the engine in reverse to avoid the auto compression release? to get a accurate reading Share this post Link to post Share on other sites
pfrederi 17,514 #6 Posted August 9, 2017 Leak down tests are more revealing. Valves vs rings. 1 Share this post Link to post Share on other sites
TravelinJavelin 620 #7 Posted August 9, 2017 ok well I 've never heard of a leak down test ..................if you could shed some light on this that would be great! Share this post Link to post Share on other sites
953 nut 54,328 #8 Posted August 9, 2017 Here is an article on the leakdown test. Engine Leakdown Tester Build Your Own.pdf 2 Share this post Link to post Share on other sites
TravelinJavelin 620 #9 Posted August 10, 2017 hey thanks there nut...appreciate it ......never have heard of this test but makes sense! 1 Share this post Link to post Share on other sites