Spanky Posted February 6, 2020 Report Share Posted February 6, 2020 Looking for some advice please. I've a 2018 250rr and I notice the odd knock when I give the bike a little rev (off the bottom, first 1/8 of the throttle). I was out riding it today with my son on his oset ( so just gently plodding hardly any throttle and at one point it startedknocking quite badly. I've read previous posts about lifting the needle up one. As far as I'm aware the needle is in the standard position. The bike never used to do this but I'm starting to notice it more and more. Many thanks. ? Link to comment Share on other sites More sharing options...
pauls320 Posted February 6, 2020 Report Share Posted February 6, 2020 Ooh..worn conrod bearing? hopefully its not already time for a rebuild Link to comment Share on other sites More sharing options...
Spanky Posted February 6, 2020 Author Report Share Posted February 6, 2020 No, its definitely ignition knock. Link to comment Share on other sites More sharing options...
2stroke4stroke Posted February 6, 2020 Report Share Posted February 6, 2020 (edited) Have you changed your petrol supplier recently? Edited February 6, 2020 by 2stroke4stroke Link to comment Share on other sites More sharing options...
Spanky Posted February 6, 2020 Author Report Share Posted February 6, 2020 No, same as always. Link to comment Share on other sites More sharing options...
faussy Posted February 6, 2020 Report Share Posted February 6, 2020 Probably dirt in your carb since its a keihin, causing it to run weak 1 Link to comment Share on other sites More sharing options...
sherpa325 Posted February 7, 2020 Report Share Posted February 7, 2020 This can occur on GasGas bikes as well and if it can't be cured by winding the air screw in a little, people generally go to a one size bigger pilot jet or a no3 slide or lift the needle. All have a slightly different effect and it seems to be a bit of trial and error as to what works for you. Also its important to do this after the bike has been decoked as carbon deposits on the head and piston can cause an increase in compression and add to the problem 1 Link to comment Share on other sites More sharing options...
dwb5151 Posted February 7, 2020 Report Share Posted February 7, 2020 Well my Trs was doing this a few weeks ago turned out, to be the CDI box 1 Link to comment Share on other sites More sharing options...
Spanky Posted February 7, 2020 Author Report Share Posted February 7, 2020 1 hour ago, dwb5151 said: Well my Trs was doing this a few weeks ago turned out, to be the CDI box Well I hope that's not the problem ? Link to comment Share on other sites More sharing options...
Drehmoment Posted June 4, 2023 Report Share Posted June 4, 2023 I am having the same issue currently. How did you find out it was the CDI? Link to comment Share on other sites More sharing options...
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