petrg Posted January 16, 2016 Report Share Posted January 16, 2016 I have now managed to get my sons Rev3 running after a stator rewind and new CDI. However with the choke off the engine speed seems to surge at low speed,ie not smooth and consistent. With the choke on it seems to be a lot more stable, and when I put the choke off again engine speed increases! I have removed and cleaned carb, even checked inlet boot for splits and even removed manifold gaskets, cleaned and reinstalled, yet problem still exists. Any ideas?? Quote Link to comment Share on other sites More sharing options...
petrg Posted January 16, 2016 Author Report Share Posted January 16, 2016 I swapped my carb over to this bike and it runs perfect. So its clearly a carb problem. But what? Quote Link to comment Share on other sites More sharing options...
lockie28 Posted January 16, 2016 Report Share Posted January 16, 2016 What kind of carb is it? Quote Link to comment Share on other sites More sharing options...
petrg Posted January 16, 2016 Author Report Share Posted January 16, 2016 lockie28 its the standard rev 3 carb, fitted circa 2000 on. A Mikuni... Quote Link to comment Share on other sites More sharing options...
lineaway Posted January 16, 2016 Report Share Posted January 16, 2016 You need to remove the jets and clean them out. Mainly the small one in the carb body, which is the pilot jet. Quote Link to comment Share on other sites More sharing options...
petrg Posted January 16, 2016 Author Report Share Posted January 16, 2016 carb is currently in bits, soaking it in carb cleaner overnight... Lets see if that cures it. couldn't see any crap in there though.. Quote Link to comment Share on other sites More sharing options...
the addict Posted January 17, 2016 Report Share Posted January 17, 2016 carb is currently in bits, soaking it in carb cleaner overnight... Lets see if that cures it. couldn't see any crap in there though.. A tiny spec of dirt in the wrong place will be a problem, you need to remove the jets and blow them through with an air line its the only way. Quote Link to comment Share on other sites More sharing options...
huski Posted January 17, 2016 Report Share Posted January 17, 2016 Boiling the jets in water for a couple of minutes cleans them up like new.Zap em with wd40 when cold Quote Link to comment Share on other sites More sharing options...
steve_earle Posted January 20, 2016 Report Share Posted January 20, 2016 I'd bet on blocked pilot jet or crud in the pilot circuit passage, Remove the mixture screw and blast through with carb cleaner then compressed air. Quote Link to comment Share on other sites More sharing options...
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