wapsy Posted May 22, 2007 Share Posted May 22, 2007 my yamaha dt 125 03 reg, will run for about an hour and then blows the spark plug causing it to miss fire can any1 help me plz:D thanks. tom Link to comment Share on other sites More sharing options...
Mick-Nev Posted May 22, 2007 Share Posted May 22, 2007 my yamaha dt 125 03 reg, will run for about an hour and then blows the spark plug causing it to miss fire can any1 help me plz:D thanks. tom have you got the correct plug type / heat range and checked the gap between the electrodes , as far as I am aware the gap is usualy 0.7 to 0.8 but it would be worthwhile checking Link to comment Share on other sites More sharing options...
wapsy Posted May 23, 2007 Author Share Posted May 23, 2007 have you got the correct plug type / heat range and checked the gap between the electrodes , as far as I am aware the gap is usualy 0.7 to 0.8 but it would be worthwhile checking cheers m8 ill have a look afta work thanks. tom Link to comment Share on other sites More sharing options...
Willenium Posted May 23, 2007 Share Posted May 23, 2007 cheers m8 ill have a look afta work thanks. tom For that bike you want an NGK BR8ES. Check your fuel mix as well as you might be running a bit lean. Link to comment Share on other sites More sharing options...
wapsy Posted May 23, 2007 Author Share Posted May 23, 2007 For that bike you want an NGK BR8ES. Check your fuel mix as well as you might be running a bit lean. thanks for the help ill will have ago l8er afta work thanks .tom Link to comment Share on other sites More sharing options...
wapsy Posted May 24, 2007 Author Share Posted May 24, 2007 nope i tryd it and it didnt work anything ele m8?? runs for about an hour then blows the spark plug? thanks for the help cheers. tom Link to comment Share on other sites More sharing options...
Willenium Posted May 25, 2007 Share Posted May 25, 2007 nope i tryd it and it didnt work anything ele m8?? runs for about an hour then blows the spark plug? thanks for the help cheers. tom If you can get your float bowl off you can note the jet sizes and I can tell you if anything is wrong on that count. Any mods to the bike at all? Link to comment Share on other sites More sharing options...
Jhehaz Posted June 17, 2007 Share Posted June 17, 2007 If you can get your float bowl off you can note the jet sizes and I can tell you if anything is wrong on that count. Any mods to the bike at all? I have the same bike (not the same one but the same model etc) and the plugs only last about an hour and then suddenly die. It is quite expensive and annoying, any ideas gratefully received... apparently this is a common problem with these machines? Link to comment Share on other sites More sharing options...
martin young Posted June 21, 2007 Share Posted June 21, 2007 What do you mean? Blows the plug? Is it burnt? Or sooty? Wet? What colour is the plug electrode when you pull the plug out? Link to comment Share on other sites More sharing options...
Jhehaz Posted June 22, 2007 Share Posted June 22, 2007 What do you mean? Blows the plug? Is it burnt? Or sooty? Wet? What colour is the plug electrode when you pull the plug out? Nothing actually blows, the engine just stops and wont start again until I fit a new plug. The electrode looks ok, a little black and slightly oily/sooty but nothing really unusual... Link to comment Share on other sites More sharing options...
martin young Posted June 22, 2007 Share Posted June 22, 2007 Check the oil pump setting. Check the float height. Clean the air filter. Make sure the full stroke for the throttle cable is set correctly. Oily/sooty is unusual. The plug should be chocolate brown. If it's black it's running rich or too much oil. Link to comment Share on other sites More sharing options...
Jhehaz Posted June 24, 2007 Share Posted June 24, 2007 Check the oil pump setting. Check the float height. Clean the air filter. Make sure the full stroke for the throttle cable is set correctly. Oily/sooty is unusual. The plug should be chocolate brown. If it's black it's running rich or too much oil. Thanks. I know the filter is ok, not sure about the other things you mentioned. I suppose it could be running rich, would this cause the plug to overheat and die or something like that? Link to comment Share on other sites More sharing options...
martin young Posted June 24, 2007 Share Posted June 24, 2007 Overheat - no. Soot up - yes. Look at the plug tip. You want a nice chocolate brown colour. Black = rich. White = lean. Wet and black could be too much 2 stroke oil being injected by the pump. Link to comment Share on other sites More sharing options...
Recommended Posts