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Down on number1

Discussion in 'Yamaha 250cc In-Line 4's' started by madchild, Apr 28, 2015.

  1. madchild

    madchild Active Member

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    The number 1 cylinder is down i have a good spark i,m sure as i got a nice touch of it [​IMG]. After checking the coil running to number1 with the multi meter and i got a reading of 5.0 so all is good there but i cant get anything from the plug lead to coil.

    The coil thats running 3 and 4 is reading 2.9 so it seems thats not so good but those cylinders are running fine?

    i'm going by this vid i found on the youtube [​IMG].



    No reading from coil to plug lead though.

    Any thoughts?
     
  2. Murdo

    Murdo The Good Doctor Staff Member Premium Member Ride and Events Crew Contributing Member

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    Remove the plug cap and see if you can get a spark from the end of the wire. The same coil fires No 4, so if 4 is firing it must be a bad connection in the No1 wire.
     
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  3. madchild

    madchild Active Member

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    Cool i,ll check that out tomorrow it's 10:30 pm here atm.
     
  4. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    Snip a couple of MMs off the end of each lead to give the caps some new wire to screw into

    Check the screw inside the cap is not corroded
     
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  5. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    And if u need to replace the leads they come out like this .... clip is fragile though

    IMGP1535 (Small).JPG
     
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  6. GreyImport

    GreyImport Administrator Staff Member The Big Cheese Contributing Member

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    And if u turn the lead and clip gently in opposite directions it 'unlocks' the clip and slides off

    IMGP1536 (Small).JPG
     
  7. madchild

    madchild Active Member

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    i sprayed contact cleaner everywhere i thought there would be any corrosion and it seems to be running fine atm thankfully!

    So i,ll leave it at that for a while felt good to get back out on it again as i had been laid up for 5 months with a leg injury which atm is niggling its way back if it isn't the bike that is broken down it's me lol.
     
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