VinXCz Posted June 7, 2014 Share Posted June 7, 2014 I own a Yamaha FZS bike, now four years old. I'm experiencing problems during revving up the bike to high speeds. The engine gives up suddenly, the throttle doesn't respond(like what you face when the fuel tank goes dry), but the fuel tank is full, battery is recently charged. Then I need to keep the bike idle for around 10 - 15 minutes, then the engine check light blinks and then i can start the bike again but not for long when this happens again. I have changed the whole electrical wiring twice now but doesn't seem to solve the problem. It works good till a week after servicing the bike, but then this starts again. Please guys help me out to fix this. Link to comment Share on other sites More sharing options...
NE0 Posted June 7, 2014 Share Posted June 7, 2014 From your description it sounds like some form of fuel starvation. Simple things first. Check the fuel cap of the tank to ensure the breather is not blocked/partially blocked. or it may have a rubber gasket which has become 'stuck' If its blocked as the fuel is used, a vacuum is created above the fuel which will in turn stop the fuel from leaving the tank. As you throttle up, you use more fuel and the vacuum is created. The throttle doesn't respond (like what you face when the fuel tank goes dry). May be helpful? Link to comment Share on other sites More sharing options...
VinXCz Posted June 7, 2014 Author Share Posted June 7, 2014 Okie, thanks for this info, i will be checking on this now, i would also like to know more about the engine check light, like what all checks does it do. Link to comment Share on other sites More sharing options...
blackhat250 Posted June 7, 2014 Share Posted June 7, 2014 How old is the bike, is it carbs or injection,,, Link to comment Share on other sites More sharing options...
VinXCz Posted June 13, 2014 Author Share Posted June 13, 2014 Mine is a carb type. 5 year old now. I have opened the fuel pipe and checked, the fuel flow is normal. no blockage. now there s one more issue that's come up. I have replaced my old battery because it was almost 4 year old. When i try to start the engine, it just gives cranking noise continuously but doesn't start. Full fuel, full battery but no use. Any clues where to start.? Link to comment Share on other sites More sharing options...
dt502001 Posted June 13, 2014 Share Posted June 13, 2014 First thing to check is spark,pull the spark plugs and lay them on the cylinder start bike as normal and see if you have any spark. Link to comment Share on other sites More sharing options...
VinXCz Posted June 14, 2014 Author Share Posted June 14, 2014 i am not able to see any spark, just wanted to know will the spark be clearly visible in sunlight or is it very minute? Link to comment Share on other sites More sharing options...
VinXCz Posted June 14, 2014 Author Share Posted June 14, 2014 anyway, i have replaced my spark plug with Iridium NGK, no luck couldn't start the engine, also can you tell me if iridium spark plug draws more charge from the battery..? Link to comment Share on other sites More sharing options...
slice Posted June 14, 2014 Share Posted June 14, 2014 Don't think Iridium plugs draw more power than normal plugs they are just more conductive than ordinary metals so giving you a better cleaner spark, as to your original problem sounds like you have a dead coil pack if your getting no spark at all, tho it might be a fuse or earth problem, try taking the coils off and checking the wiring and the earth points. Link to comment Share on other sites More sharing options...
VinXCz Posted June 17, 2014 Author Share Posted June 17, 2014 Thanks guys, this has helped a lot, I'm able to start the bike now ...one more help needed though, when the bike is in neutral, the accelerator response is very good, but when changed to first or second gear the response is quite bad at lower rpm, higher rpm is again good. Any suggestions on this...!! Link to comment Share on other sites More sharing options...
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