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i've never dabbled with a block off kit but you don't want to put oil in your crankcase. that's the point of mixing it with the gas.
http://www.pwcforum.com/vintage-jetski/2436-1977-js440-oil-question.html
http://www.pwcforum.com/vintage-jetski/3540-650-sx-basic-questions.html
40:1 or 50:1 would be a good guess for the mix. its 40:1 on 550's but 50:1 on the 550SX's with the reed valves. might have to ask someone smarter than me to get a solid answer.
http://www.pwcforum.com/vintage-jetski/2436-1977-js440-oil-question.html
http://www.pwcforum.com/vintage-jetski/3540-650-sx-basic-questions.html
40:1 or 50:1 would be a good guess for the mix. its 40:1 on 550's but 50:1 on the 550SX's with the reed valves. might have to ask someone smarter than me to get a solid answer.