Posted February 5, 201015 yr hi i have a 03 dt125r and after a days use i have to replace the spark plug could someone please tell me how to solve the problem thanks
February 5, 201015 yr Moderator hi i have a 03 dt125r and after a days use i have to replace the spark plug could someone please tell me how to solve the problem thanks What's the plug look like when its done, black, white, nice coffe tan colour. Red spots on the insulator. Any cracking. Are you SURE its the plug. Have you tried changing the cap as well.
February 7, 201015 yr Author What's the plug look like when its done, black, white, nice coffe tan colour. Red spots on the insulator. Any cracking. Are you SURE its the plug. Have you tried changing the cap as well. hi its black and its defontly the plug because when i put a new one in its fine im woundering if i need a hotter plug e.g one from a yz
February 7, 201015 yr hi its black and its defontly the plug because when i put a new one in its fine im woundering if i need a hotter plug e.g one from a yz Plug should be a NGK BR9ES(Factory standard) or BR8ES(hotter type), which are you running? When you say black, is it a dry and sooty black(over rich fuel/air mixture), or wet and oily black(excess 2-stroke) ?
February 7, 201015 yr Moderator hi its black and its defontly the plug because when i put a new one in its fine im woundering if i need a hotter plug e.g one from a yz No, something is causing the plug to fail, its a symptom not the cause. An ignition fault can give the impression of a rich mixture due to the incomplete burn as the spark brakes down. Have you tried re fitting the old failed plugs at a later date. And have you tested the plug cap and coil. Fuel won't kill a plug and 2stroke wont either. Something electrical is messing you about.
February 7, 201015 yr Author hi i was running it on br9es but i have bought a br8es today so im going to give that a try thanks
February 7, 201015 yr No, something is causing the plug to fail, its a symptom not the cause. An ignition fault can give the impression of a rich mixture due to the incomplete burn as the spark brakes down. Have you tried re fitting the old failed plugs at a later date. And have you tested the plug cap and coil. Fuel won't kill a plug and 2stroke wont either. Something electrical is messing you about. ^^You need to answer these really. A hotter plug wont make any difference if its electrical^^ All a hotter plug does is help keep the build up of carbon down on the plug(usually on a poorly tuned or older bike). I was thinking it was just a fouled plug, but without any more info/pics on the plug condition its guess work.
February 7, 201015 yr Moderator hi how would i check the cap Standard resistance test, normally 4 Thousand Ohms (4K Ohms) on a resisted cap as a rule but the manual will tell you exactly. While you are looking at the cap, make sure it is securely connected to the lead with a sound electrical connection and the cap locks on to the plug really positively.
February 8, 201015 yr BR8 is a hotter plug than BR9 so may help Here's a useful picture Cool picture, worth keeping a copy
_33963e.png)
_83bc35.png)
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.