Put your 300 on a diet - Honda CBR 300 Forum
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post #1 of 78 Old 10-24-2014, 04:58 PM Thread Starter
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Put your 300 on a diet

This thread has been prompted by another kicking around about improving your bikes performance through reduced reciprocating mass which involved putting lightweight tyres etc on your bike.

So i thought I'd share what I did to my bike (and my old CBR250) to significantly increase performance through an improved power to weight ratio. Which is basically what Honda has done with the 300 as its the same weight as the 250.

But if you want to make it even better read on...

Change the stock muffler for an aftermarket item, preferably carbon fiber. This will be your single biggest gain (up to 5kg of weight shed)

Change the lead acid battery for a Lithium Ion. I have a Shorai. (just under 2kg lighter)

Remove the pillion peg brackets on both sides and hang the muffler off an aluminium hanger. Mines a Yoshi. (just under 1kg )

Change the clunky steel handle bars for some trick aluminium ones from the likes of Woodcraft or Vortex. I have both, the vortex are a bit low for the 250's tho, they hit the top of the fairing. (1.4kg)

Remove the fairing mounted mirrors (You can get aluminium 'CBR' embossed blanks to cover the mounting holes) and fit an aluminium bar-end mirror instead. This is legal in New Zealand, not sure about other countries and this wont be to everyone's liking anyways. (half a kg)

Change the indicators to little ones. There's heaps of them out there to chose from. (half a Kg)

Fit an aluminium tail tidy and do away with that horrible steel rear sub frame piece. Numerous threads around about the different ones available. (half Kg)

Remove the tool kit under the pillion seat. The tools in there have the same consistency of cheese and wont be of much use to you on the side of the road anyways. The rear shock tool is handy though. (over half a kg)

Remove the pillion grab rails. Does make the back of the bike look a bit odd tho. Still lookin for something trick to fill the gap. (any one got any ideas??) They weigh just under a kg even tho they are made from aluminium.

So.... you can see all this adds up to over 10kg (22lb) in weight reduction and you definitely notice it when you crack the throttle wide open, esp in the lower gears. You notice it just wheeling the bike in and out of the garage.
Note that apart from the muffler, all these items sit high on the bike and by lightening or removing them you make an already nimble handling bike even more so!


Ive had my bike on the scales. Full of gas ready to ride it comes in at 150kg (330lbs).

If anyone wants any links or further info just holler.

2014 CBR300
2004 XR250
SV 650 track bike

"Knees in the breeze is my only disease"

Last edited by kiwi rider; 11-27-2015 at 03:09 AM.
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post #2 of 78 Old 10-28-2014, 11:18 PM
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Originally Posted by kiwi rider View Post
This thread has been prompted by another kicking around about improving your bikes performance through reduced reciprocating mass which involved putting lightweight tyres etc on your bike.

Personally I'd rather have good stiff-walled tyres on my bike so thought I'd share what I did to my bike (and my old CBR250) to significantly increase performance through an improved power to weight ratio. Which is basically what Honda has done with the 300 as its the same weight as the 250.

But if you want to make it even better read on...

Change the stock muffler for an aftermarket item, preferably carbon fiber. This will be your single biggest gain (up to 5kg of weight shed)

Change the lead acid battery for a Lithium Ion. I have a Shorai. (just under 2kg lighter)

Remove the pillion peg brackets on both sides and hang the muffler off an aluminium hanger. Mines a Yoshi. (just under 1kg )

Change the clunky steel handle bars for some trick aluminium ones from the likes of Woodcraft or Vortex. I have both, the vortex are a bit low for the 250's tho, they hit the top of the fairing. (1.4kg)

Remove the fairing mounted mirrors (You can get aluminium 'CBR' embossed blanks to cover the mounting holes) and fit an aluminium bar-end mirror instead. This is legal in New Zealand, not sure about other countries and this wont be to everyone's liking anyways. (half a kg)

Change the indicators to little ones. There's heaps of them out there to chose from. (half a Kg)

Fit an aluminium tail tidy and do away with that horrible steel rear sub frame piece. Numerous threads around about the different ones available. (half Kg)

Remove the tool kit under the pillion seat. The tools in there have the same consistency of cheese and wont be of much use to you on the side of the road anyways. The rear shock tool is handy though. (over half a kg)

Remove the pillion grab rails. Does make the back of the bike look a bit odd tho. Still lookin for something trick to fill the gap. (any one got any ideas??) They weigh just under a kg even tho they are made from aluminium.

So.... you can see all this adds up to over 10kg (22lb) in weight reduction and you definitely notice it when you crack the throttle wide open. Note that apart from the muffler, all these items sit high on the bike and by lightening or removing them you make an already nimble handling bike even more so!
You notice it just wheeling the bike in and out of the garage.

Ive had my bike on the scales. Full of gas ready to ride it comes in at 150kg (330lbs).

If anyone wants any links or further info just holler.

I am spending a little money to get the weight off, going to Pirelli 11.1 pound tire, oem tire is 16 pounds, using light weight rear sprocket with TI sprocket bolts and nuts, taking over 2 pounds off the chain, will change exhaust and battery. also went to a drilled 14 tooth front sprocket and 33 tooth light weight rear one. trying to drop that RPM at 70 mph and up my mpg.
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post #3 of 78 Old 10-31-2014, 04:49 AM Thread Starter
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Originally Posted by louie View Post
I am spending a little money to get the weight off, going to Pirelli 11.1 pound tire, oem tire is 16 pounds, using light weight rear sprocket with TI sprocket bolts and nuts, taking over 2 pounds off the chain, will change exhaust and battery. also went to a drilled 14 tooth front sprocket and 33 tooth light weight rear one. trying to drop that RPM at 70 mph and up my mpg.
Ive just finished fitting my new aluminium rear sprocket I got from PMP sprockets. Not sure where you get those titanium ones from Louie but the 34 tooth aluminium one is a third of the weight of the OEM steel one. Will be interesting to see how it wears tho.
sprocket 002.JPG

sprocket 003.JPG

sprocket 005.JPG
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2014 CBR300
2004 XR250
SV 650 track bike

"Knees in the breeze is my only disease"
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post #4 of 78 Old 11-02-2014, 12:50 PM
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Remember too, if you don't fill your gas tank all the way you are eliminating weight. That weight is up high weight too so it makes the bike handle better as the gas is used up. I essentially ride around with half a tank of gas or less unless I am heading out for a long trip.
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post #5 of 78 Old 11-02-2014, 06:48 PM Thread Starter
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Yep, your onto it. At track days I only go out with enough fuel for the session plus a little reserve. I'm also lucky I only weigh 130lbs.

2014 CBR300
2004 XR250
SV 650 track bike

"Knees in the breeze is my only disease"
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post #6 of 78 Old 11-03-2014, 01:04 PM
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Originally Posted by AJ Nin View Post
Remember too, if you don't fill your gas tank all the way you are eliminating weight. That weight is up high weight too so it makes the bike handle better as the gas is used up. I essentially ride around with half a tank of gas or less unless I am heading out for a long trip.
Good tip, that's one I see a lot of people recommending and not just in the motorcycle world.
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post #7 of 78 Old 11-19-2014, 11:52 AM
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Change the lead acid battery for a Lithium Ion. I have a Shorai. (just under 2kg lighter)
I'm searching for a Li-Ion battery, but I can't find "fitment" on any of them. What are the specifications I should look for? Case size, or a part number? Thanks!
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post #8 of 78 Old 11-19-2014, 12:39 PM Thread Starter
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This is the one you want:

LFX14L2-BS12 - Shorai Lithium Batteries

You may find the terminals are on the wrong side but the leads reach anyways.
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2014 CBR300
2004 XR250
SV 650 track bike

"Knees in the breeze is my only disease"
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post #9 of 78 Old 11-21-2014, 12:25 PM
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Thanks!
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post #10 of 78 Old 11-21-2014, 03:38 PM
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At a price of $159 that's not too bad at all, sure beats the prices for automotive lithium ion batteries.
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