oil mix

[correllcr]

i have a 70s to mid 80s 2 stroke 5hp seaking outbord and i was wondering if any one could tell me what the oil fuel mixture should be and is there anything cheap i could do to get a little more power out of it anything helps thank you

[Landlubber]

correllcr,

Make sure that you burn out with a gas torch the expansion chamber/exhaust pipe. They get clogged up seriously with carbon, and make all the difference to the power. Look at installing a carby from a motorbike from the same era that has the same bore diameter, they are very efficient carbys, but be careful as they often run reed valves and will not be suitable for the crankcase that you have to feed.

I would expect thast the ratio was 25:1, but i am not sure, certainly it will not do damage at that strength. If no one else can accurately state the ratio, run it on that and see the plug after 14 minutes of constant throttle, if it is getting black, you can lean out the oil to say 30: 1 and see again. Do not go too lean as the old engines rely on it seriously.

[correllcr]

do i have to take the exhaust apart from the engine to burn it out or just stick the tourch up from the end by the prop and does anybody know where on the internet i can get a prop for this and how would i find out the exact year this was made thank you

[Landlubber]

No removal is the best way, then you can do the whole job properly.

Do a search on Google with the engine description and see what happens

[Landlubber]

http://www.outboardrepairs.com/topics/015702.html

[correllcr]

i found the serial# 36x865122 and model #gg18801a can anybody tell me the year and any info you know about this engine thankyou

[powerabout]

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