mattp33 Posted August 26, 2011 Report Share Posted August 26, 2011 Hey guys I am changing the spark plugs on my 89 merc 90hp. I went to the marina and they gave me NGK BUHW-2, when I took the covers off it has BU8H plugs in it? Did the guy before me use the wrong plug? It runs fine now so should I replace the plugs with the same or should I be using the ones the marina says it calls for? Thanks Link to comment Share on other sites More sharing options...
DRIFTER_016 Posted August 26, 2011 Report Share Posted August 26, 2011 Hey guys I am changing the spark plugs on my 89 merc 90hp. I went to the marina and they gave me NGK BUHW-2, when I took the covers off it has BU8H plugs in it? Did the guy before me use the wrong plug? It runs fine now so should I replace the plugs with the same or should I be using the ones the marina says it calls for? Thanks Use the ones the marina sold you the BU8H's are incorrect for that engine. Check your serial# against this Chart This Chart shows the engines that the BU8H plugs are recomended for. Link to comment Share on other sites More sharing options...
mattp33 Posted August 26, 2011 Author Report Share Posted August 26, 2011 what if my serial number is A728264? Link to comment Share on other sites More sharing options...
DRIFTER_016 Posted August 27, 2011 Report Share Posted August 27, 2011 what if my serial number is A728264? Click the check mark that coresponds to your engines year Here i.e. the check mark on the first row of the chart. Link to comment Share on other sites More sharing options...
mattp33 Posted August 27, 2011 Author Report Share Posted August 27, 2011 NGK site says I should be using BUHW-2 but now I am not sure cause of that chart? My serial number is not on there. What the heck engine do I have? Link to comment Share on other sites More sharing options...
mattp33 Posted August 27, 2011 Author Report Share Posted August 27, 2011 ya I was just there lol. I got the right ones I know I do. I wonder why this is why its hard to start sometimes, the guy has the wrong plug in it! Link to comment Share on other sites More sharing options...
DRIFTER_016 Posted August 27, 2011 Report Share Posted August 27, 2011 ya I was just there lol. I got the right ones I know I do. I wonder why this is why its hard to start sometimes, the guy has the wrong plug in it! I have a '91 and they are not the easiest staring engines around to begin with. I have found that the beast way to start mine when cold is to pump the fast idle lever a couple of times and leave it all the way up then push in the key (primer) and spin the starter, push in the key again while turing over. It will usually catch at this point, if not pump the fat idle lever a couple more times and push in the key and turn over again. Once the engine catches you will need to push in the key a couple more times (when the engine starts to stumble and the rpm starts to drop). Could be 2 or 3 times (depends on how fast the engine warms up). Once it runs on it's own drop the fast idle lever to a reasonable rpm to finish warming up. Can't wait to get a nice fuel injected 4 stroke for my boat. Link to comment Share on other sites More sharing options...
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