Does this mean you can run any injection on any motor as long as it came from the factory that way? Used to be we could not mix and match injection from years and models. When was this voted on or changed? Just a simple clarification please to now if we can mix and match Thank You

pretty much like an R1 injection on an R6---- its legal as the rules are written

When was that changed? Boy does that open up everything. Except, of course mechanical fuel injection. Now engine builders, injection builders, dyno operators and owners can get really creative. I'm sure that will save us a lot of money. Ha Ha.

The rule has been like that for two years. Making the bore bigger will only kill torque, I would think it would be more of an advantage to go smaller. But even then I think it will not help. I think the manufactures, with their billions$ in research, have the throttle body diameters pretty well matched up right with the engine.

The rule has been like that for two years. Making the bore bigger will only kill torque, I would think it would be more of an advantage to go smaller. But even then I think it will not help. I think the manufactures, with their billions$ in research, have the throttle body diameters pretty well matched up right with the engine.


No one said anything about making bore bigger. I don't think manufactures have spent any money on researching these engines on alcohol & or upper & lower nozzles like we run. Mike, you are telling me that if I ran 04 kaw, I could of ran 05 - 06 injection for the last two years? Man, I was really missing something or just reading a real old rule book print.

So does this mean we can mix or match? Just a simple answer if brand R fits on brand X run it. Or if a 7 fits on a 12 run it Thanks

Now I have a ???? If what is being said here is true then why was it a big deal about MFI having to use stock thottle bodys & also a problem with them being bigger then stock bore. Once again I see the dog chasing it's tail. :eek:

i ll send you a can of gray spray paint.... coat your rule book allow it to dry then re read it.... you'd be suprised :D

I too do not understand why people voted against taking out the "No aftermarket throttle bodies" rule, making MFI legal.

Can we get a simple answer to the question? Seems like yes to me, but then again things never seem to be easy. Yes or No? Thanks then we can move on

The rule states "No aftermarket throttle bodies"

So the question is in the definition of the word aftermarket. Aftermarket (in the bulk of the dictionaries I just checked) is the selling of parts or equipment for a product after the initial product was manufactured and sold.

Yes, you can run Honda throttle bodies on a Kawasaki because they were not manufactured for the purpose or intent of being sold to use on a different engine. One could argue that the buyer is using them as an aftermarket item, but the seller (Honda) never intended that use.

I can tell you the original intent of this rule was just to keep someone from custom building a set of throttle bodies for sale to use on these engines. I have to agree that the wording is not the best, but that is what we have to work with for the next three years. Please forgive me.

Thanks Mike just wanted it know that if someone puts a 750 injection on a 600 or a Yam. on a Kaw. that's ok

The rule states "No aftermarket throttle bodies"

So the question is in the definition of the word aftermarket. Aftermarket (in the bulk of the dictionaries I just checked) is the selling of parts or equipment for a product after the initial product was manufactured and sold.

Yes, you can run Honda throttle bodies on a Kawasaki because they were not manufactured for the purpose or intent of being sold to use on a different engine. One could argue that the buyer is using them as an aftermarket item, but the seller (Honda) never intended that use.

I can tell you the original intent of this rule was just to keep someone from custom building a set of throttle bodies for sale to use on these engines. I have to agree that the wording is not the best, but that is what we have to work with for the next three years. Please forgive me.

So what is being said by the definition is that the efi conversions are aftermarket and are illegal by the rules ..... pretty cool:D

The rule does not say anything about conversions, just the throttle bodies. You can modify the throttle bodies all you want, you just can't use aftermarket ones.

the fly in the ointment are the electronics.... you cannot use a different manufacture electronics. you can use R6 throttle bodies on a kawasaki but you must use the kawasaki ecu and harness....just so we are clear.