Outboard mechanics?

k folkman

k folkman

Well-known member
I am getting conflicting reports on this now. Can I upgrade my 1999 Johnson 9.9hp to a 15hp by re-jetting the carb? My buddy's dad says yes but I am reading otherwise. It can't be that easy right?..........................Kevin
 
Kevin,

It's not just the carb. The exhaust is also different. I have a 9.9 Evinrude and was going to do the same thing but found to truely make it a 15hp it would need more than I was willing to put into it.
 
Kevin,
For some year motors it is that simple but as John said for others it involves the exhaust tuner and or carb body so if you have to buy them new it is not worth it. The only way to know and I have done it is to go through a parts breakdown part number by part number and compare. There is a web site that I will lookm for that has great detail about this. It might be a fishing site from the NW US but I will try to find it. Good luck.
 
Thanks guys. It seems that from what I've been reading the older ones are a carb change only. Anything late eighties and up are more involved..........................Much apreciated..........................Kevin
 
Kevin, I was on craigslist, NJ, either South Jersey or Jersey Shore and there was someone selling a 15 hp Johnson carb that he had had on a 9.9 and when he sold it he put the original back on and is selling the 15. Dont know what year but I believe it was in Bridgeton, NJ.
 
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