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87 YZ125 won't start up. New top end at the begining of the season. It ran like a brand new bike for me one day and then it stopped starting. Could it be the crank seal? I'm not an expert on 2 strokes. It seems to be getting gas and it has spark. The carb was cleaned twice. I'm running out of ideas and may end up selling it or bringing it to a shop.
Check the condition of the spark plug two strokes go thru plugs like no other. if a new plug does not help check to see if you are getting a bright blue spark at the plug while kicking it over. also make sure the fuel is fresh and is mixed with oil properly to much oil will foul out a plug fast if all else fails try a compression test it should be in the range of 130-150 psi.
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Season 1 opens in March 1960 and finishes Thanksgiving Day, 24th November 1960. Season 2 picks up on Valentine's Day, 14th February 1962 and ends in October 1962 with the peaceful resolution of the Cuban missile crisis. Season 3 starts somewhere during Spring 1963 with Betty Draper (January Jones) being approximately six months pregnant and ends on the evening of 16th December 1963. Season 4 begins around Thanksgiving in November 1964 and ends in October 1965. Season 5 begins on Memorial Day weekend in May 1966 and ends in March 1967. Season 6 begins at Christmastime in December 1967 and ends on Thanksgiving Day, 28th November 1968. Season 7 begins in January 1969, around the inauguration of President Richard Nixon and ends mid-season on the morning of 22nd July 1969, two days after the successful moon landing of Apollo 11.
seems fuel related--pump and pressure regulator may be failing--a pressure test for residual fuel is needed. Go to an honest, independent or specialist. Injector driver could be going bad. It\'s in the computer. Get a obd 1 scan tool on it to read data as well as any codes
check and make sure its getting fuel. when trying to start, spray some engine starting fluid in spark plug hole. just a little bit. replace the plug then try to start it. if it starts then quits then its a fuel problem. fuel not reaching engine. good-day !
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