throttlebody question - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 12 (permalink) Old 07-21-2012, 08:28 AM Thread Starter
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throttlebody question

i heard somewhere that the rc51 has the biggest throttleboddies to go on any production sports bike ever. is this true or am i talkin crap?
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post #2 of 12 (permalink) Old 07-21-2012, 08:49 AM
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The SP1 has two 54mm throttle bodies with 4 jets.
The SP2 has two 62mm throttle bodies with 12 (smaller) jets to better atomize the fuel.
I've heard that one of our throttlebodies is bigger than both combined on a Harley. Not sure if that's true...

John, 2000 RC51 #000100

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post #3 of 12 (permalink) Old 07-21-2012, 10:27 AM
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For the time I believe this to be true. The Harley from what I have seen are around 43mm and probably vary by the factory options. (maybe up to 50mm)

Throttlebody, not carburetor.

Just for comparison a run of the mill Honda Civic gets a 60mm...



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post #4 of 12 (permalink) Old 07-21-2012, 10:48 AM Thread Starter
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are they the biggest ever tho? for a production sportsbike
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post #5 of 12 (permalink) Old 07-21-2012, 02:28 PM
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What does it matter anyway?
They are large enough for the engine's purposes....
The Aprilia Mille has a 52mm throttle body and it is a bit stronger in high rpms than the RC51 I think.....
What kind of pissing contest is this??


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post #6 of 12 (permalink) Old 07-21-2012, 03:56 PM
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Is there any other kind of pissing contest?...biggest, fastest, strongest it's all the same usually both parties are wrong. Lol but you are correct Makis whatever it takes to get the job done.



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post #7 of 12 (permalink) Old 07-21-2012, 03:58 PM
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I once won a pissing contest.....only because I drank a 12 pack of beer in less than an hour....

My reason for answering was to let Polarbear him in on what little information I know with a nice comparison to a cage.



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post #8 of 12 (permalink) Old 07-21-2012, 08:42 PM
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.....Lol but you are correct Makis whatever it takes to get the job done.
You know what? I wanted to install an SP2 swingarm on my RC51........but I won't cause it has a 22mm pivot axle, while mine has a 25mm....I am the king!
No need thinner pivot (penis) just to get the looks of an SP2 swingarm.....


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post #9 of 12 (permalink) Old 07-21-2012, 09:10 PM
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At that time they were the BIGGEST.
Now Ducati's 1098/1198 oval throttle bodies have a bigger effective diameter of 63.9mm
Panigale has 67mm. throttle bodies

Last edited by rc51 Red Rider; 07-21-2012 at 09:13 PM. Reason: extra information
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post #10 of 12 (permalink) Old 07-22-2012, 09:48 AM
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At that time they were the BIGGEST.
Now Ducati's 1098/1198 oval throttle bodies have a bigger effective diameter of 63.9mm
Panigale has 67mm. throttle bodies
So, they are still the biggest round throttle bodies then....that settles it



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