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Old 11-15-2018, 09:07 PM   #1
Grease_Monkey
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Superbike rules & twin cylinder motorcycles.

Starting to get things in order to get back into Racing. Scoped out the current rule book and notice a rule had been omitted.

I believe it used to be legal to build a single or twin cylinder bike to Formula specs and still be legal to for Superbike.

I only ask as my '96 ninja 250 has a ninja 300 engine in it, and that exception allowed me to not only be legal for SBK, but also stay some what competitive. Was this something that was purposefully removed or just seemed like an antiquated rule that affected no one?
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Old 11-16-2018, 12:04 PM   #2
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That rules was for twins running down class by using their own rules. I think 250 class was excluded so that rule would not apply for what you doing.
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Old 11-17-2018, 12:35 PM   #3
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This was from the 2014 rulebook and I speak of 6.1.2(9b) Was it voted upon to be omitted, or just removed?



6.1.2 SUPERBIKE: Superbike Rules apply (ref. Section 9.2). Production-legal bikes may also run in Superbike classes. Each of the following displacement categories is a class:
175-250 cc
251-450 cc
451-600 cc
601-750 cc
751-Open cc
a) The following 4-strokes may run down one class in Superbike: Singles,
Twins and 675 cc triples.
b) 4-stroke Singles and Twins may be built to either Superbike or Formula rules.
c) Water-cooled twins are limited to a 250 cc displacement advantage when
running down a class.
d) 600 cc and 750 cc class bikes may run up a class.
e) Openccbikesarelimitedtostockmanufactureddisplacementplus1mmoverbore.
f) A “3/4 600” (a 600cc four cylinder modified as a 450 triple) may run in
450 Superbike with a maximum functional displacement of 450cc. The 4th
cylinder must be permanently disabled. Rule 8.1.1c does not apply.
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Last edited by Grease_Monkey; 11-17-2018 at 12:37 PM..
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Old 11-20-2018, 08:30 AM   #4
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Hi Joshua,

I would do your brain a big favor and at least start reviewing the 2018 rule book https://www.afmracing.org/documents/...es_current.pdf

There have been several major changes since 2014. Keep us posted if this doesn't answer your questions.
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Old 11-21-2018, 08:37 AM   #5
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I can save you some reading and let you know that your bike is not Superbike legal.
Engine cases and frame have to remain the same as it came from the factory.
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Old 11-22-2018, 07:28 PM   #6
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I understand that it is currently not legal for SBK. I read the rule book, that is why I am asking this question.

My question is what this omission done purposefully by a vote or just left off as it was felt it did not apply to modern racing?

My follow up would have been, Id like to re-instate the rule, but I seen I have missed the window. I guess I'll wait till next year to bring it up.
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Old 11-22-2018, 07:41 PM   #7
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It was removed as there were efforts to utilize this rule to build one off motorcycles and then race them in a production based class.
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Old 11-23-2018, 12:15 AM   #8
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It was removed as there were efforts to utilize this rule to build one off motorcycles and then race them in a production based class.
That rule applied for superbike based class only.
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Old 11-23-2018, 07:06 PM   #9
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By production based, I meant street legal based motorcycles vs one off race framed motorcycles with dirt bike engines, or other.
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Old 11-23-2018, 07:50 PM   #10
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By production based, I meant street legal based motorcycles vs one off race framed motorcycles with dirt bike engines, or other.
No formula class required street legal motorcycles. Even SB was limited to minimum somewhere in world.
Formula twins classes had many of this bikes in past and reason for rule, so they could race in sb classes.
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Old 11-26-2018, 11:28 AM   #11
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And in an effort to keep production based classes somewhat cost effective, it was an effort to get back to standard baseline configurations. There was a time from 2000 to 2010 where there were a lot of custom bikes that were truly formula bikes by the rules. The numbers of these bikes is down to about 2 with most being true superbike builds now.
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Old 11-27-2018, 05:01 PM   #12
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And in an effort to keep production based classes somewhat cost effective, it was an effort to get back to standard baseline configurations. There was a time from 2000 to 2010 where there were a lot of custom bikes that were truly formula bikes by the rules. The numbers of these bikes is down to about 2 with most being true superbike builds now.
2 if you don't count cripples which are basically formula bikes.
Just because it does not cost much to convert it does not make it much different than putting 300 engine in 250 ninja frame. Neither are production, they are formula bikes. So, why would one formula bike be legal for SB and other not?
That is exactly reason rule was changed back than, so they all can play same game.
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Old 11-28-2018, 10:47 PM   #13
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Putting a smaller engine in a highly advanced fame (like cripple 450) gives an advantage. putting a bigger engine is a lighter frame also gives an advantage. Though they are opposite sides of the coin, they still are both Formula derived builds.

If getting a higher quantity of bike participating is a goal, then give both these types of bikes considerations in Superbike.
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Old 12-01-2018, 01:04 PM   #14
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Every other CLUB racing Organization in the Country has this Rule still written into their class structure.

6.1.2B

Im glad someone else took notice.

The rule did only apply to SB NOT superstock Or "production"
The AFM could really pick up a few more bucks from its existing paddock and after 7 rounds of entry that chunk of change could be significant. Just by re inserting this sub text

Last edited by ILOAD2; 12-01-2018 at 01:06 PM..
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Old 12-01-2018, 03:55 PM   #15
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I agree. there are so many old race bikes out there that can be resurrected and competitive with rules like these in place. The Legacy classes are a great thing, but I feel most riders want to be on track as much as possible. Plus bigger groups make for some amazing racing.
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