Joined: 26 Nov 2009 Posts: 520 Location: California USA
Posted: 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
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum