Supermooser Posted July 31, 2011 Share Posted July 31, 2011 My bike has started virtually first time for the last 6 months. The other day I started it and ran it for about ten minutes and it just cut out like there was suddenly no spark coming from the plug. I pushed the bike home and checked the spark was firing and it was not. It is a relatively new spark plug which has worked fine for the last month. I did try the old plug to see if this worked but it did not. I removed the seat and petrol tank to have a look at the wiring and could find no loose or disconnected wires. I left the bike for a couple of weeks before having a look again. Somehow, after doing nothing other than that that I have said I could see the plug was sparking again. I excitedly replaced the tank seat and seat to take it for a ride. After about 10 minutes running time and riding a 1/4 of a mile - exactly the same thing happened - it seemed like the plug just stopped firing. Once again I pushed the bike home. I am now thinking it is an ECU problem or a coil problem? Any ideas folks? I've checked eBay and I can get a coil for about £10, however the ECU is about $40+, otherwise I would just buy them both and hope this resolves the problem. Can anyone give me any advise on how to check the coil and ECU before getting a new one? - Or any advise on this problem??? Link to comment Share on other sites More sharing options...
yamahait Posted July 31, 2011 Share Posted July 31, 2011 My bike has started virtually first time for the last 6 months. The other day I started it and ran it for about ten minutes and it just cut out like there was suddenly no spark coming from the plug. I pushed the bike home and checked the spark was firing and it was not. It is a relatively new spark plug which has worked fine for the last month. I did try the old plug to see if this worked but it did not. I removed the seat and petrol tank to have a look at the wiring and could find no loose or disconnected wires. I left the bike for a couple of weeks before having a look again. Somehow, after doing nothing other than that that I have said I could see the plug was sparking again. I excitedly replaced the tank seat and seat to take it for a ride. After about 10 minutes running time and riding a 1/4 of a mile - exactly the same thing happened - it seemed like the plug just stopped firing. Once again I pushed the bike home. I am now thinking it is an ECU problem or a coil problem? Any ideas folks? I've checked eBay and I can get a coil for about £10, however the ECU is about $40+, otherwise I would just buy them both and hope this resolves the problem. Can anyone give me any advise on how to check the coil and ECU before getting a new one? - Or any advise on this problem??? hi i had the same sort of problem on a kawasaki 100 years ago,ended up being the coil breaking down,i would go down that route first as it is the cheapest and sounds just like the problem i had, cheers Link to comment Share on other sites More sharing options...
Moderator Airhead Posted August 1, 2011 Moderator Share Posted August 1, 2011 how is the 'fit' between the HT cap and HT lead...loose? Link to comment Share on other sites More sharing options...
Supermooser Posted August 5, 2011 Author Share Posted August 5, 2011 If a HT lead is the lead between the coil and plug cap then there's no movement at either side/firmly secured. The whole coil/lead/plug cap seem very solid and in good order. Is there any way to test a coil before buying a one? I've replaced so many unnecessary part son my bike it's frustrating and quite costly! Link to comment Share on other sites More sharing options...
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