BMW K bikes (Bricks)


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1Back to top Go down   weak spark  Empty weak spark Sat Apr 22, 2023 4:06 am

firstle

firstle
Life time member
Life time member
what are the problems which may cause a weak spark ? just incase i have missed one , spark is yellow not nice and blue as i would expect , or am i being to fussy  Crying or Very sad

    

2Back to top Go down   weak spark  Empty Re: weak spark Sat Apr 22, 2023 10:12 am

Point-Seven-five

Point-Seven-five
Life time member
Life time member
What have you checked so far?

Weak spark can be caused by:

-old spark plugs

-resistor plugs with resistor wires

-leaky plug wires

-dirty connections on the coils

-cracked coil bodies

-running NGK D7EA plugs without the terminal nut

-low battery voltage

-dirty battery ground


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

3Back to top Go down   weak spark  Empty Re: weak spark Sat Apr 22, 2023 11:41 am

firstle

firstle
Life time member
Life time member
-running NGK D7EA plugs without the terminal nut .................... bang on , the po fitted new plugs with no top nuts . 

    

4Back to top Go down   weak spark  Empty Re: weak spark Sat Apr 22, 2023 3:04 pm

Point-Seven-five

Point-Seven-five
Life time member
Life time member
You can get the top nuts at any shop that services small engines.  They usually have a bucket of old plugs that you can take the nuts off.  Those nuts never wear out so you can swap them from the old plug to the new one.

I don't know why NGK doesn't include those nuts with the spark plugs.  I was able to get a bag of a dozen nuts by emailing NGK Technical service and explaining that the plugs I bought didn't have nuts and the BMW wires didn't work without them.  I told the tech that I had been using NGK for nearly 50 years and didn't really want to change brands just because they didn't have those nuts.


__________________________________________________
Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

5Back to top Go down   weak spark  Empty Re: weak spark Sun Apr 23, 2023 3:13 am

firstle

firstle
Life time member
Life time member
will not have this happen again just bought 50 off ebay . im hopeing this may cure the poor starting, will not have helpped , can not belive i missed this Embarassed i must be getting old , im sure i will be back with the next problem but for now thank you .  Very Happy

    

6Back to top Go down   weak spark  Empty Re: weak spark Sun Apr 23, 2023 10:36 am

moriarti

moriarti
Life time member
Life time member
ITS only Blinding Bloody Obvious, after we have found it, makes us laugh or cry depending on have we spent any money or not, we have all done it at some point. scratch


__________________________________________________
1984 k100 rs red/black VIN  0004449 Now sold to Olaf
    

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