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1969 BSA, Thunderbolt

  • 15 May 2010 10:09 PM
    Message # 341674
    Anonymous

    my 69 thunderbolt wont start. Cleaned carb, has Boyer ignition lots of spark.  Its been sitting for a few years.  Just got it, any help would be great. 

    robin.carmount@sympatico.ca

  • 17 May 2010 12:02 PM
    Reply # 344870 on 341674
    Art
    Robin Carmount wrote:

    my 69 thunderbolt wont start. Cleaned carb, has Boyer ignition lots of spark.  Its been sitting for a few years.  Just got it, any help would be great. 

    robin.carmount@sympatico.ca


    Pull a spark plug and give a shot of fuel or quick-start into the cylinder.  If you get no firing or it kicks you off the kickstart on the first two kicks then your timing is out.  The first thing to look at is to make sure the boyer ignition has been timed to the correct whole and your wires match from the case to the Boyer.  From memory it should be set to the counter-clockwise hole.

    If it did fire and run on the fuel that you put into the cylinder then it is the carb.  Mine took quite a bit to get running the first time.  Make sure the cylinders are downhill from the carb when you tickle it to make sure the fuel is flowing into the head.  Tickle it till fuel runs out of the tickler all over your fingers.  It does take a bit of suction to pull the fuel out of the carb the first time it runs.  At that point if it runs but doesn't idle it will be your pilot jet, they are very hard to clean properly and corrode very quickly from sitting.

    Best of luck.

  • 07 Jun 2010 10:43 PM
    Reply # 355542 on 341674
    As ART said try 1/2 teaspoon of fuel in spark olug holes  . It should run a few seconds when you kick . I assume you've tried starting it many times & unless you've replaced the plugs , they are probably fouled by now . A GOOD SPARK is crisp blue/white , hair thin . NOT a BIG white or orange flash . So put in NEW plugs , 1/2 teaspoon of fuel & kick ...IF it doesn't work , Cross your wires from the pick-ups to the BOYER . Put in another 1/2 teaspoon & kick again . One way should work .IF NOT . You have other problems > compression , arcing wires , weak battery , poor wiring , slipping clutch , etc .......good luck 


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