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  1. #1

    94 sl750 weak spark

    hello

    my name is andy i was wondering if any one could help me i recently brought a sl750 as a non start . it has what i beleive to be a really weak spark i have done every check i can stator reads up ok

    reading are

    ignition exciter 486
    ignition pulser 95
    ignition trigger 212

    i've even tested the cdi on another ski. It started on the button. I cant find any thing wrong with this ski. Even the ht coils are coming up ok on the meter does any one have any sugestions on were to look i am new to ski but i am a mechanic .

    i've check crank index. check compressions.

    many thanks andy


  2. #2
    On all cylinders?

  3. #3
    yes indexed all cylinders and compression is 125 across all 3

  4. #4
    Trouble shoot coil.

  5. #5
    i did think about coils but wats the chance in all 3 failing i have a weak spark on all cylinders.

    dose battery voltage have a major effect on coils whats the lowest i should see when cranking

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    On a Fuji engine, all the ignition coils are in series. The CDI fires them all together, every time any cylinder needs a spark.

    Ohm check the coils again, and also check that the single coil connection to ground is good.

    If you haven't already, trim the spark plug wires back 1/4", and re-screw the caps on.

    Make sure you are using the correct spark plugs - resistor type only.

    Polaris Fuji (blue) engine

  7. #7

  8. #8
    Fully charged battery is very important.

  9. #9
    Quote Originally Posted by K447 View Post
    caps on.

    Make sure you are using the correct spark plugs - resistor type only.

    Polaris Fuji (blue) engine
    just been down the shed it has bp8es x2 and and a b8es ive never paied attention 2 the plus as the are brand new

  10. #10
    Plugs to use are NGK BPR7ES 5534

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