1992 Fxlr Custom.

Discussion in 'Electrical' started by jackotom, Mar 2, 2012.

  1. jackotom

    jackotom Member

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    Hi, i own a 1992 fxlr which has developed a misfire, i think its on the rear cylinder. i put 2 new Ngk r DCPR8E plugs in and it ran great. left it a few days went for a short ride and it began misfiring again and back firing through the exhaust. i changed the plugs again for used ones but it still seemed to run on one cylinder.the bike has had a twin coil conversion, a crane programmable electronic ignition module (Model Hi 4) and a Mikuni 45mm carb,a 96cu and 1600cc conversion. the bikes only done 9000miles .And it has a new battery.
    can anyone Help? and also recommend any other spark plugs that might be better?
    thanks for all help received.
    Dave.
     
  2. HDDon

    HDDon Experienced Member Contributor Retired Moderators

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    Have you done any other work on the bike lately? I would probably try a new set of plug wires.
     
  3. Jack Klarich

    Jack Klarich Expert Member

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    http://www.cranecams.com/uploads/instructions/90003200.pdf Have a read here, @ the bottom is a trouble shooting area, would not be the first time I have seen a pick up or a coil go bad
     
  4. Jack Klarich

    Jack Klarich Expert Member

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    Welcome to The Forum, Have you run a compression test yet? Just curious and check your push rod adjustment also. Compression test may reveal a blown head gasket, if i have to make a guess it would be the rear cylinder, but the spark as I mentioned in my other post would be the first thing to check, Good luck and check back in