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Hey VintageMoto,

If you or previous owner haven't done a top end in the last 80-100 hrs check your shop manual I would do a complete top end, it's not too expensive see link below,

http://www.motosport.com/product?adpos=1o1&cc=us&creative=188670676285&device=c&gclid=EAIaIQobChMI3Yu_xsqx1QIVwoSzCh3RkA-WEAQYASABEgIAEvD_BwE&key=Wiseco-ProLite-Piston-Kit-2Stroke&matchtype=&mmy=suzuki%3Brm125%3B1985&mmy_source=pdp&network=g&product_id=WP-COMBO&psreferrer=https%3A%2F%2Fwww.google.com%2F&pssource=true&segment=badger

Have all parts on hand, tools, rags, olis, grease, coolant, shop manual, check youtube video's for 125 top end rebuilds and book mark the one's you like, take pictures as you go if needed and reverse the order when putting it back together, wash off the bike before you start, take your time and good luck

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Flip the bike upside down with the jug off like changing a tire on a BMX been there ! It will be fine some people flush it with diesel or kerosene but I just use a lil pre mixed gas then flip it back over and let that run out

Sent from my Moto G (4) using ThumperTalk mobile app

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Take  cylinder jug off , I take the piston off the rod too but you don't have too pour lil gas or diesel  down in the bottom end flip the bike upside down so it and coolant come out and use the kick starter to turn motor over a few times flip it over and put it back together 

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