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1997 GSX: 13 year old spark plugs

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I took these pictures immediately after pulling them out. One has a lot of crud and the other seems cleaner. Wondering what that might mean. Fuel lines are Grey Tempo, one theory I have is that one carb is clogged and running lean and the other is not. Otherwise I worry about piston, piston rings, cylinder damage. Compression tester coming in mail this week, so I'll know pressures in a few days.

spark1.jpgspark2.jpgspark4.jpg

NGX BR8ES vs. NGX BR7ES

1997 GSX specs say it needs BR8ES plugs, so I order 4, then take a look at the old, plugs that came out of a machine that hasn't run for 13 years, and they are BR7ES.

So some research, compare and contrast and the only difference between 7 and 8 is "Heat Rating" which further research shows varies from manufacturer to manufacturer, and sometimes higher is hotter and sometimes higher is cooler.

So is the non-factory recommended "7" NGK hotter or cooler, and why would someone install these instead of the "8's" that were recommended. The previous owner was a doctor and would never have done this himself, in fact he probably took it to the dealership that sold him the Seadoos (there are two), so if people are willing to share theories, I think it's most likely that this was done by a professional Seadoo mechanic in a dealership. My question is why, and why were the Grey Tempo fuel lines not replaced then? 2016 minus 13 years (last time these Seadoos were used) was 2003. Was the Grey Tempo degradation problem known then?
 
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I think the 7 is a hotter plug. Just use the 8. No good way to tell on those. They likely were in there for a while. It is likely that NO service was ever done on it. It probably was smoking and someone told him to go to hotter plugs. If your plugs look like that, then make sure you also pull out and clean your RAVE valves. I am sure they are a mess.
 
The 7 is indeed the hotter plug. NGK is the opposite of most other plugs.
As advised, go with the 8's. By all means, change out those fuel hoses and clean out the fuel system.
 
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