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checking spark on 1985 115hp Straight 6

emac

Regular Contributor
Hi, got the above listed engine, when i got it the seller told me it was one cylinder was not firing, he also said it runs on a couple cylinders at low speed, and wouldnt fire on all 6 until wot. So, if thats the case, how do I check the spark if they arent meant to fire?
Side note, I checked the ohm resistance on the trigger and stator as per galambs instructions on a previous post and believe I need a new switchbox, which means I have to replace both, correct?
 
Re: checking spark on 1985 115 Straight 6

It is recommended you replaced both. Most likely the new one will be a different revision level and you want them to work the same. Plus, due to the way they work it is not uncommon for the bad one to make the good one look bad.
 
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