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Sounds like the pilot jet maybe blocked. Float level incorrect or worn/dirty needle and seat for overflow. Give the carb a clean out, check the needle/seat for wear and reset the float height.

Rewinding makes perfect sense Sean. Depending on location there are a few places that rewind stators, this guy is central NSW coast. Andy Wheeler 45 Bayside Dve Green Point Ph (02)43692313

From the sounds of things it could do with a good carb service. Disassemble, clean and blow out all the carby jets. Check the float height and fuel flow before assembly. The 2 screws are an idle speed screw and the pilot air mixture screw. The higher of the two or rearmost screw is the idle...

Cody, fit a '77/'78 RM80B or C model cylinder, exhaust and carb and it'll go like a rocket. Not sure if the taper on the crank of the JR is the same but the internal rotor ignition, cdi and coil from an 'aircooled' RM80 will make it super snappy (peaky as all hell) The engines in the JR and the...

I'm 48, love riding my dirtbikes and giving them a good thrashing or visa versa. Still have my RM80 and RM400 bought new in '77 and '78 when I was 15 and I started off at riding at 7. Still weigh under 50kgs so the mini's love me! :-) 1973

Joel, I have a feeling the bike has a blocked/choked exhaust or exhaust port in the cylinder. Whip off the pipe and have a look in both the pipe and the cylinder where it bolts up. Chances are you'll find it all but blocked with carbon build up causing an excessively oily exhaust residue and an...

new old guy Hi, located in Brisbane QLD, been around dirtbikes for the past 40 years so you could correctly assume I'm a fossil just like my collection. I have approximately 30 (ish) bikes in total predominantly Suzuki's. This includes about a dozen mini's but no models are any later than 1984...

Some of my old mini beasts.