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Discussion Starter #1
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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Discussion Starter #3
I will probably do as you suggest and have my stock injectors cleaned. You have proven with all the development work that there is nothing to be gained by going to SP2 parts as far as power output, but what about the problem of lurching when trying to run at a constant low (60 mph) speed with small throttle openings? Can SP2 injectors be installed in SP1 throttle bodies without doing any modifications except for maybe a remap? There are no issues with clearance or connectors?

You have an awesome race bike!

Robert
 

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Simply because I have the set the thread starter mentioned for sale I will have to disagree.

Why would Honda increase the diameter of the TB's as well as upgrade the injectors 3 times that of the SP1? Simply because it's fun to change things up a bit? I say NO

There are MANY threads (not started by me) based on this debate and I for one say this.

Honda recognized a cheap opportunity to improve the performance of a successful motorcycle and brought it immediately (all be it 2 years after launch) to the public changing very little else to the later model.

as it stands now there are FAR more SP2 models (and all the AEM parts) than that of the SP1, therefore a proper fuel/air ratio (by have the proper set up) may be needed or at least get a owner closer to that of the AEM manufacturer intended performance gain.

No attack intended, just wanted to state my point on all the upgrades I did to me SP1
:twocents
 

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Discussion Starter #5
Simply because I have the set the thread starter mentioned for sale I will have to disagree. ...
I don't understand. I didn't mention anything for sale, but if you have SP2 injectors for sale, and can confirm that they will fit the SP1 throttle bodies, I would like to know. Even if you don't have anything for sale, I would really like to know if SP2 injectors will fit SP1 throttle bodies. Thanks for any info.

[email protected]
 

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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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Discussion Starter #7
I was also thinking that I would not notice any difference after going to the expense and trouble of changing the injectors. I read somewhere that somebody knew somebody who said the dimensions of the injectors were different which made installation difficult, and also that the connectors were different. I've posted these questions trying to find out what's true. If they were a direct replacement I'd be tempted to try them.

Maybe the larger throttle bodies were a benefit to the race teams.

Thanks for the info.

Robert
 

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Hey fellas. I know this is a zombie thread. Sorry.

Damon is the only guy I know of that actually "proved" that SP1 TBs produced more <read: better> power than the SP2 TBs. I believe he was talking more about the smaller diameter than the injectors.

That being said, is it worth it for a SP2 owner to swap to SP1 TBs (including the SP1 injectors, as SP2 injectors won't fit) for the "better" performance?

Thoughts? Any SP2 owner do this?
 

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hi guys,i`m in the process of fitting sp2 tb to my sp1.i`ve had countless problems with sp1 tb,got a good set of sp2 tb for a $100 with less than 7000 miles on them.only difference in fitment that i`ve found is a different airbox and stacks.will be fitting sp2 headers as well.will be glad to get rid of all the fuelling problems.australian models don`t have the air injection system like us models.
all we have is the airbox flapper and crankcase breather system.
 
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