Taking weight off - 1000RR - 600RR.net
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post #1 of 10 (permalink) Old 01-11-2019, 05:10 AM Thread Starter
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Taking weight off - 1000RR

I started this thread to avoid jacking because I have a hell of a list to respond. This is an experimental project to build an ultra light streetable 2011 CBR1000RR. The stock bike was roughly 449 lbs wet (curb weight full tank) and is now 383 lbs wet (curb weight full tank). I currently ride it on street twisties and drag strip at 357-362 lbs and it is minus 18 lbs of rotational weight vs stock.

@wibbly I agree a bike's weight with fuel tank full to the brim is the most useful number for quick comparisons.

That said, 95% of the time when I ride the bike it ranges from 357 to 362 lbs. I leave with 1.1 gallon of fuel (just before reserve light comes on) and I pull in the driveway with about .2 left in the tank. Once the display says you are .7 gal into your reserve you can no longer do full power launches or hold power wheelies up without starving the fuel pump.

I use calibrated scales to weigh the parts in grams and keep track of it all on a spread sheet. I use a pair of digital bath scales to verify the bike's actual weight and to keep an eye on front/rear weight bias (52% front 48% rear)

This is how I got it down to ~359 lbs streetable

Ride with only .2 to 1 gallon, avg saved 23.5 lbs
Titanium Akrapovic EVO w carbon canister saved 14.2 lbs
Size 5 Lithium battery strap removed saved 3.7 lbs
Taylor Made carbon fender/brake light/blinker/plate eliminator saved ~4 lbs
+ Rear of subframe cut short (previous owner mod) saved ~2 lbs
Mirrors removed saved 2.4 lbs
Air intake ducts removed saved 1.6 lbs
Passenger pegs and bolts removed saved 1.58 lbs
Large radiator fan removed saved 1.3 lbs
Air flapper mod saved 1.2 lbs
Bar ends and weights removed saved 1.13 lbs
PAIR system/reeds removed saved .85 lbs
Exhaust servo motor and cable removed saved .77 lbs
Coolant res almost empty saved .5 lbs
Aluminum bolts fairings/banjo/drain etc saved .5 lbs
AL gas cap saved .4 lbs
Rearsets lightened saved .38 lbs
Manual .37 lbs
Counter shaft cover and guard removed .36 lbs
Headlight assembly lightened saved .31 lbs
Headlight dust covers and hardware saved .27 lbs
Tool kit .23 lbs
Chain guard removed saved .23 lbs
Rear brake reservoir delete saved .22 lbs
Ultra light horn swap saved .18 lbs
Rear hugger removed saved .18 lbs
Mini front brake res saved .15 lbs

Rotating unsprung
BST rims saved 7 lbs
Front tire Q3+ 120/60 saved 1.6 lbs + 1.5 lb wear
Rear tire Power RS 190/50 saved .5 lbs + 2 lbs wear
520 EK 3D GP chain saved 1.15 lbs
520 44T AL Renthal rear sprocket saved .6
520 15T Renthal front sprocket saved .23 lbs
AL sprocket nuts saved .18 lbs
rear rotor ultra light w ti bolts saved .8 lbs
Front right rotor removed saved 2.8 lbs

Front right caliper/pads/brake line removed saved 2.6 lbs
Front fender and reflectors removed saved 1.3 lbs

left fairing removed saved 1.3 lbs
right fairing removed 1.3 lbs
lower fairing removed saved 1.18 lbs
rear seat cowl saved .47 lbs
tank shelter lightened saved .17 lbs
under headlight plastic removed saved .21 lbs
inner V removed saved ~.33 lbs

449 - 90.3 = 358.7 lbs

There was a bunch of tiny stuff not worth typing but this is the vast majority. I dont mind sweating the small stuff so I pay attention to every detail out of curiosity, things that seem negligible like brake pad weight and wear over time.

I upgraded the rear shock from an 08-11 CBR1000RR (5.99 lbs) to a 12-16 CBR1000RR (6.94 lbs) to get the balance free shock so it added .947 lbs to the bike but I felt that was worth the extra pound. There are very lightweight shocks out there maybe I can track one down and save a few lbs there. The stock spring rate is too stiff because of the weight loss so I backed preload off a bit and surprisingly I still get good travel, damping and traction so I let it be.

I found a cheap titanium fuel tank from the 2017 SP, hoping I can make it fit to save 2-3 lbs. If I could find a CMC front rotor that would save 1.38 lbs rotating. Any other suggestions, questions or criticisms please post them up.

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Last edited by SaratogaLED; 01-11-2019 at 03:27 PM.
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post #2 of 10 (permalink) Old 01-11-2019, 05:38 AM Thread Starter
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As it sits now the bike is extremely nimble, low steering effort, easy to handle it loves to change direction but stable if you want it to be. It is very confidence inspiring, wants you to jump over railroad tracks, throw it from side to side while cornering without upsetting suspension, can power up out of corners while leaned over a bit and you can really rail on the brakes right after a full acceleration to get a nice G force swing. 0-150 in less than 10 seconds, you can out accelerate any other street machine out there (that can actually corner). Or you can ride your grandmother on the back quietly like any street Honda and get amazing gas mileage.

I never tampered with the motor other than ECU flash so reliability should be good. I thrashed the poor bike from 12000 to 17000 miles with no troubles so far. Spent $4K on the bike +$5K on fixing it up and mods so cost me 9K if I wad it up.

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post #3 of 10 (permalink) Old 01-11-2019, 05:40 AM Thread Starter
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I did have to put the pegs back on so I could ride my GF
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post #4 of 10 (permalink) Old 01-11-2019, 05:41 AM Thread Starter
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double post

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post #5 of 10 (permalink) Old 01-11-2019, 05:43 AM Thread Starter
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post #6 of 10 (permalink) Old 01-11-2019, 10:39 AM
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Yeah that makes more sense. My 600rr was 382 and absolutely complete. I do put my bikes on diets but always have them complete with all fairings and street gear.

My rc51 was 489 stock and is 424 now.
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post #7 of 10 (permalink) Old 07-08-2019, 05:47 PM
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I love weight loss stuff.

A bit scared on mine but I have taken off about 2lbs so far. Cat delete pipe soon. Plan on doing a L-ion battery too. Oh, I did take the tools and manual out as well, so there is that. :)

I may do PAIR valves if that is a thing on '17?? but not for a bit.

I would love to open up the airbox a bit more and remove the flapper valve in there, again if that's a thing on a '17?

You went way past where I would go, with the brakes and airbox and a few other small things. Yes the brakes were heavy parts, but I like knowing I have world class brakes up front.

I like the wind cutting ability of the fairings too, those will stay.

I had the rear pegs off, but put them back on, as I think that if the bike tipped over at low/0 speed they would keep the rear seat cowl paint nice and protect some mechanical bits in the rear.

tell me more about the smaller front master? Its god aweful on my bike.

Also more about the rear master delete? something that will keep the fluid in, and not allow it to draw in moisture and not look "back yard"?

17 CBR600rr some small free mods
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post #8 of 10 (permalink) Old 07-09-2019, 10:59 AM
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Removed the radiator fan? don't get stuck in traffic.

Coolant res almost empty?

Headlight dust covers removed?

Riding with only 1 gallon?

No mirrors?

Front right rotor, caliper, brake line removed?

All that body work?


I get reducing weight to improve performance, but you sir have taken it way too far IMO. even to the point of risking your own safety. Plus the bike looks silly, like its been crashed and then repaired on the cheap.

No thanks, not for me.

I am from CANADA, the land of poutine, back-bacon and GOOD BEER!!
2012 STREET BIKE OF THE YEAR

Last edited by v-tec crx; 07-09-2019 at 11:10 AM.
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post #9 of 10 (permalink) Old 07-09-2019, 08:31 PM
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Quote:
Originally Posted by v-tec crx View Post
Removed the radiator fan? don't get stuck in traffic.

Coolant res almost empty?

Headlight dust covers removed?

Riding with only 1 gallon?

No mirrors?

Front right rotor, caliper, brake line removed?

All that body work?


I get reducing weight to improve performance, but you sir have taken it way too far IMO. even to the point of risking your own safety. Plus the bike looks silly, like its been crashed and then repaired on the cheap.

No thanks, not for me.

Truth be told, id rather just go to the bathroom before I ride and still have both brake rotors on the front so its evened out.

'08 600RR
'13 CBR250r REPSOL
'04 TJ Rubicon-5spd,5.5"lift
'00 Z28 Camaro-6spd,LS6
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post #10 of 10 (permalink) Old 07-10-2019, 01:36 AM
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Saratoga LED, awesome Bike!

You did a superb job of trimming weight intelligently for your purpose.

5 stars, my compliments.

don't listen to h8'rs posts above......
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