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Force-V4 Forum Index » RC45 Discussion » rear sprocket

 
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Bolly



Joined: 13 May 2020
Posts: 1
Location: Australia

  

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PostPosted: Wed May 13, 2020 5:59 am    Post subject: rear sprocket  


Hi Guys I have a new bike yes you guessed it the gearing is original and way too tall does anyone know here you can buy a lower sprocket

Also fuel tap apparently they are all worn out and can not be replaced

Or does anyone know where you can buy the whole Diaphragm

Regards Bolly Perth Australia
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Busy Little Shop
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Joined: 26 Nov 2009
Posts: 520
Location: California USA

  

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PostPosted: Wed May 13, 2020 6:24 pm    Post subject:  


Hiya Bolly... I'm not sure what you mean by Fuel Tap???

RC45's stock and mod final drive ratios

Stock 17/40 = 2.35 ratio

+3 = 17/43 = 2.52 ratio is ideal

-1 + 3 =16/43 = 2.68 ratio is too low

-1 + 40 = 16/40 = 2.50 is close to ideal

Notice how the ratios of 17/43 and the 16/40 come really close to the same
ratio... that means when you ride the bike it should feel about the same on
acceleration and rpms at top speed...

You can go nuts and complete ALL the math to find how the ratio effects
RPM and top speed in all the gears before you even turn the key...

Final drive ratio affects acceleration and top speed RPMS... to find a ratio
divide the rear by the front to find the correct gear ratio... I prefer
keeping the stock 17 because 1) its rubber cushioned and 2) the larger
the radius a chain follows the less wear which equals greater longevity...
however to lower the ratio to the target 2.52 requires a 43... in order to
preserve ride height of the Factory Axle Clocking (FAC) requires adding 2
links of chain...

RC45's stock and mod final drive ratios plus links of chain to preserve
Factory Axle Clocking or FAC

Stock 17/40 = 2.35 ratio x 108 links = FAC

0 + 3 = 17/43 = 2.52 ratio x 110 links = FAC

-1 + 2 =16/43 = 2.62 ratio x 108 links = FAC

-1 + 40 = 16/40 = 2.50 ratio x 108 links = FAC

Notice how the 3 different sprockets choices come really close to the
same ratio... that means when you ride the bike it should feel about the
same on acceleration and rpms at top speed...

43 teeth RC45 sprockets are easy to find in aluminum... nearly
impossible to find in steel... only the HRC kit Endurance race sprockets
are steel... Sprints are aluminum... After market companies only offer aluminum...

In order to preserve the longevity of the stock drive system I kept
the stock 17T and the 525 chain and customizing a steel 96 97 ZX7R 43T
to fit...

43 T weight difference...


17 / 43 x 110 links = perfect FAC...

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Larry L
94 RC45 #2 / RC30 #44
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San Francisco RC45



Joined: 14 Jul 2021
Posts: 7
Location: San Francisco

  

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PostPosted: Fri Jul 16, 2021 5:35 am    Post subject: I have one on my bike  


I have one on my bike...works well!

BTW, check out the rear disk brake in the background, that Larry did. Nice job!


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Honda RC45, Yamaha RZ350, BMW K1200GT, Yamaha RD500, Yamaha YL1 (two of them)
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