deleriousdave Posted September 2, 2019 Report Share Posted September 2, 2019 My 2016 4RT with 40 hours on the clock makes a bit of black smoke when I rev her. Runs great, lovely machine, starts easy. Full disclosure: I’m a lazy man, full maintenance done when I bought her with 10 hours on the clock. Nothing since other than cleaned and oiled the air filter about ten hours ago. Time for valve tuning? Too much oil on filter? Trade for a 2019? Quote Link to comment Share on other sites More sharing options...
dan williams Posted September 3, 2019 Report Share Posted September 3, 2019 As a general rule of thumb black smoke is unburned fuel. White smoke is oil. Sounds like your fuel injection might be a bit rich on top but if the bike runs good why worry. 1 Quote Link to comment Share on other sites More sharing options...
lineaway Posted September 3, 2019 Report Share Posted September 3, 2019 Well, they did go to 3 rings in 2017. Quote Link to comment Share on other sites More sharing options...
jimmyl Posted September 3, 2019 Report Share Posted September 3, 2019 All my 4rt’s haven given a whiff of black smoke when reved hard - especially when in the garage and messing with them . Think it’s just fuel as said above. Get into habit of fresh air filter every ride ( cleaned and oiled) 1 Quote Link to comment Share on other sites More sharing options...
sportsawyer Posted September 3, 2019 Report Share Posted September 3, 2019 11 hours ago, lineaway said: Well, they did go to 3 rings in 2017. All the 4RT 250cc & 260cc engines from 2005 to present have used 3 rings. The only engine that ever used 2 rings was the 2016 (first year) 300RR. Quote Link to comment Share on other sites More sharing options...
jrsunt Posted September 3, 2019 Report Share Posted September 3, 2019 Nothing to do with piston or rings. Take it apart and clean it, the throttle body and air box manifold will be black with carbon, not to mention oil in the bottom of the air box if it's been upside down. No wonder it's smoky Quote Link to comment Share on other sites More sharing options...
jonnyc21 Posted September 4, 2019 Report Share Posted September 4, 2019 I had a little of that on my 07 4RT, as jrsunt said I cleaned it out, checked the valve clearance (was good) and changed the plug and it went back to normal again. Quote Link to comment Share on other sites More sharing options...
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