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SP2 injectors in SP1

3760 Views 8 Replies 5 Participants Last post by  sp1 rider
I did a search and found this:

[Here's a quote from a post on a different RC site...

"I put the HRC (12 port) in mine and their was no difference in effect, until I added the HRC fuel regulator which kicked up the fuel pressure, which required a different map, which fixed the problem."

The 12 port's he's referencing are the newer 12-port injectors.]

So, are they a direct replacement? I read somewhere that they are not, but can't find anything definitive.

I read on a VFR site that VFRs can use later model injectors (they are 12 port), even that later model injectors are the same as Honda car injectors and can be had at auto parts stores.

I have 61k miles on my 2000, which I bought new and I'm not having any problems, but supposedly the new injectors are an improvement.
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No noticeable performance gain to be had. Not worth the tuning hassle you may encounter.

Best thing you could do is to send your SP1 injectors to RC Fuel Injection and have them flowed and cleaned.
Im not saying the later 12 hole injectors are not better, just its not likely you will notice any difference.

The SP2 injectors will not directly fit in to the SP1 bodies. I know a guy who did get them to work but I am not sure what was needed.

As fare as performance goes, I dont believe changing the injectors alone will provide any noticeable performance gains or aid in drivability any more then just a good map with your SP1 parts.

Im also convinced the larger dia SP2 bodies where more for marketing then anything else.
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