Question about 2006 Yamaha DT 125 RE

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Just bought a DT 125RE from a dealer...driving home from work and the bike just cut out...everything seems ok but have noticed the spark plug is a old one...cant understand this for the company, i bought the bike from said the bike had a service prior to sale...strong smell of petrol but nothing savere...thought it might be flooded but this is not the

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Replace the plug with a new one. If still bad, drain the carb as condensation from the petrol tank may have collected in the float bowl. Please rate my answer. Thanks.

Posted on Aug 24, 2010


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Hi,i have yamaha dt 125 lc.In time to time it makes hole on its piston and sometimes when the engine is working makes problems and it seems like loosing power or the spark from the candle is to weak cause...

This sounds like pre-ignition, ( also called 'detonation' and 'engine knock' ), Carbon buildup on the piston crown gets overheated and then causes the fuel to ignite before the spark plug even fires. This pre-ignition is VERY hard on the piston and crankshaft bearings. You will need to pull the cylinder head and de-carbon the piston and cylinder head..... but I would first go to the dealer and buy a spark plug that is one step colder than the stock plug the manufacturer supplied when the bike was new. Spark plugs control the cylinder temperature, colder plug = lower head temp = less or no pre-ignition. Problem solved? If not, then go to a higher octane gas. Problem solved? If not then install a lower heat range thermostat in your water cooled engine, i.e. go from a 180 degree thermostat down to a 160 degree thermostat.

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1 Answer


Get a BRAND NEW plug and recheck for spark. Be sure plug is grounded to engine. By the way, FTjoe (above) has some very good questions. The sator is not involved here. The dealer can check the CDI usually for free.

Feb 21, 2009 | 2000 Yamaha DT 125 R

1 Answer

Wont start

FIRST thing to check is spark plug ,make sure it is sparking ,if it is and is wet change the plug .If plug is dry it could be the carb needs cleaning out if it has beesn stood for a while

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