gregtrx Posted September 20, 2009 Report Share Posted September 20, 2009 my landlord's boy has a 2007 honda crf100 for bombing about the farm, and it's got a problem. It'll rev fine with no load but as soon as you try and ride it it starts to stutter and missfire. I've had the carb off and while it wasn't spanking new I wouldn't say it was that dirty. The air filter was ok too, and has been cleaned and reoiled. I've taken the kill switch apart and rebuilt it and cleaned up the main earth to the frame but the problem's still there. Anyone got any ideas? Is it likely to still be the carb? Or might it be the coil that's dodgy (think it's cdi ignition)? Link to comment Share on other sites More sharing options...
porter_jamie Posted September 20, 2009 Report Share Posted September 20, 2009 try a new plug Link to comment Share on other sites More sharing options...
gregtrx Posted September 20, 2009 Author Report Share Posted September 20, 2009 Yea, thought that, took the plug out and it was a bit sooty, so I cleaned it up and put it back in. Might be worth spending a couple of quid on a new one though. Link to comment Share on other sites More sharing options...
IforB Posted September 22, 2009 Report Share Posted September 22, 2009 Sounds like a weak spark, try a new plug first, but it could be something as simple as a bad earth. Off road machines and particularily XR's and CRF's seem to suffer from this. Other than that, make sure the carb is properly clean, then start checking CDi box (not cheap), stator, coil, pulse generator and clean out the plug cap, they are a magnet for corrosion and general shit. I would change the order that I've suggested though. CDi box last! Link to comment Share on other sites More sharing options...
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