overboost93 Posted March 24, 2016 Report Share Posted March 24, 2016 Hey. I got a Beta Rev3 from around 2002-2003- with a 250 ore 270 cc engine. It runs very well at idle , but when I speed, it begins to shoot in the exhaust and go bad . What could this be? I have new spark plug , fresh gasoline . cleaned the carb . Im not sure if the pilot jet is correct adjusted. I did try first with 1 round, then 1,5, then 2 and then 2,5 and then 3 turns, but nothing helped. Any tips? Second thing, Im not sure how old this bike is, i got a frame number x ZD3B9000Y0002660 x Anyone who can help me translate that frame number? On the engine side its written 352C/1 0 1/1. It go ta Mikuni carb Just to be sure, The pilot yet is the little screw i mark with a red dot on the picture right ? Thanks from Norway! Quote Link to comment Share on other sites More sharing options...
spen Posted March 24, 2016 Report Share Posted March 24, 2016 On the lower photo', is that a water droplet in the clear tube? Might be worth draining the tank and carb' and making sure it's nice and moisture free. Quote Link to comment Share on other sites More sharing options...
endokid Posted March 24, 2016 Report Share Posted March 24, 2016 Its a 2001 Quote Link to comment Share on other sites More sharing options...
dadof2 Posted March 24, 2016 Report Share Posted March 24, 2016 Sounds like its running rich as the revs rise, is your air filter clean? Quote Link to comment Share on other sites More sharing options...
bilks Posted March 24, 2016 Report Share Posted March 24, 2016 The one that's painted is your Air screw not pilot jet,normally set at between 1 1/2 to 2 1/4 turns out.The pilot jet is inside the carb, Quote Link to comment Share on other sites More sharing options...
lineaway Posted March 25, 2016 Report Share Posted March 25, 2016 You need to pull the flywheel to make sure you did not shear the flywheel key. Quote Link to comment Share on other sites More sharing options...
col h Posted March 25, 2016 Report Share Posted March 25, 2016 Hi, I had a similar issue with my rev3 a few years back, turned out to be a grounding issue where a wire had rubbed off the frame until the insulation was removed on a small position. The core of the wire would contact the frame under vibration and cause a misfire. Worth a look, pull the radiator out to get good access to wires behind head stock and check them all for damage. You can use electrical tape as a temporary fix on the damaged section to help determine if it's the cause of your issue. Quote Link to comment Share on other sites More sharing options...
col h Posted March 25, 2016 Report Share Posted March 25, 2016 Hi, I had a similar issue with my rev3 a few years back, turned out to be a grounding issue where a wire had rubbed off the frame until the insulation was removed on a small position. The core of the wire would contact the frame under vibration and cause a misfire. Worth a look, pull the radiator out to get good access to wires behind head stock and check them all for damage. You can use electrical tape as a temporary fix on the damaged section to help determine if it's the cause of your issue. Quote Link to comment Share on other sites More sharing options...
evoalien Posted March 25, 2016 Report Share Posted March 25, 2016 Its a 01 Quote Link to comment Share on other sites More sharing options...
jamie1234 Posted September 7, 2022 Report Share Posted September 7, 2022 I also have the exact same bike, with a carb issue it's running really rich, can someone tell me the settings on the carb screws please. And also the fuel on/off switch I suspect is broken does anybody know the positions the switch should be for fuel on/ off / rez?? Quote Link to comment Share on other sites More sharing options...
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