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Discussion Starter #1 (Edited)
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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Discussion Starter #2
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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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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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"?
 

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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.
 

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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.

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.
 

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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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Discussion Starter #11
@Grey I know you are probably not being serious but I hear that response all the time. So for fun, the average piss is 1 pound and the average poo for a man is about 1 pound. Im not saying scrapping your rotor is a must have mod either. In order for weight reduction to really have a nice impact you need either an endurance situation OR a lot of weight reduction all working together, which is the goal with this bike.

@tary preisser thanks for the encouragement! If you are ever in upstate NY come take a rip on it!
 

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Discussion Starter #12
@v-tec crx I totally understand and expect skepticism and like I said many of these ideas I would not recommend to others. Ive got a lot to lose and I am not looking to crash. But the goal here is to experience something rare, within reason and report my take on it. Maybe some people will like these ideas, maybe people will give me ideas. I will probably never put up the $80,000 for a Panigale Superleggera 1299, but this is the closest thing and only cost $9,000. This Honda, even in its skeleton form is probably more reliable than a Panigiggly and you can whoop on it guilt free. (PS If anyone has a Superleggera that is street legal lets do a bike swap video and maybe I will eat my hat)

The bike has 2 radiator fans so it hasnt been an problem but on top of that I only ride back roads so I don't get stuck in traffic. At the drag strip I just turn the bike off while Im waiting to make a pass. Yes coolant res is almost empty and has stayed at that level since Ive owned the bike. It stays perfectly cool (172F) and no air bubbles so I figured why haul extra fluid around.

The headlight dust covers havent been a problem. Ive had them off for about 5000 miles now. Upstate NY is not a dusty place but if it were Id probably fab something up that was a bit lighter.

When I go riding I just hit back road twisties for 20-40 minutes and Im home. No need to haul an extra 20 lbs of gas with me unless Im riding to some destination like the drag strip. In that case I only take what extra gas I need to get there and make my passes. Then I grab another gallon on the way home.

I sometimes miss having my right mirror but on the other hand, the front end gets swung around quite a bit and it feels really nice not having mirrors flipping around up there, so for now Ive been running without them and I just look behind me when necessary. If it becomes a problem Ill put them back on but I doubt that.

Ive been riding hard with single brake for years on several bikes. At first it was just out of curiosity but it actually feels great. This 2011 1000RR with one OEM caliper/rotor and Carbone Lorraine pads, stops quicker than any bike I have ever ridden, including my stock 2008 1000RR. The 2011 is minus 20lbs of rotational mass and the master seems to work better with single caliper. I have even ridden a 275 lb passenger and the bike still stops great. I also did a test, twisting the throttle at the same time as squeezing the front brake hard, while going downhill, and the brake was able to overpower the grip of my Dunlop Q3+. So for my riding goals there seems to be no downside.

We had a rare nice winter day but it was so windy my friend declined to ride. So I went out anyway (riding in the 20-120mph range) and didnt even notice the wind other than it being cold on my neck. Its a non issue IMO.

I tested the bike on the drag strip with and without the bodywork and air tubes. Trap speed was reduced from 144mph to 142mph but ET remained the same. 9.995 was my best and that was without the air tubes. I took density altitude into account and the results were repeatable. Corrected for density altitude it was 9.7 ET and 145mph trap without the air tubes or fairings. Sure it may look weird but that is very low on my priority list and having fun is very high on my list. I want to experience what it feels like to beat on a 357 pound liter bike. Turns out if feels good so I keep doing it instead of putting everything back on ; )
 

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Discussion Starter #13
@John H For the 600RR you save quite a bit going to lithium battery, highly recommended! You can go as small as a size 5 (1 LB $70) and that should save you 6 pounds going off memory.


I got rid of the rear reservoir on the 1000RR and the 600RR. It was a nice weight savings on the 600RR and it helped the look of the bike quite a bit. I used a rainbow titanium bolt as a plug or you can use the Honda black plastic plug. If/when you ever need to service the rear brake you can temporarily reinstall the reservoir to make bleeding easier OR you can do it the hard way and bleed without it which also works fine.


I use mini plastic reservoirs for the front brake on the 1000RR and 600RR. Improves looks a bit and save a bit of weight.

Ill try to find some pics of the rear res mod, once its gone you dont even notice it.
 
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