what have you done to shed some weight off the behemoth

Posted: Mon Jan 11, 2010 7:22 pm

Just curious what some of you F fans have done to shed some lbs of the 750/900F Behemoth

Posted: Mon Jan 11, 2010 7:35 pm

trekrider wrote:

Just curious what some of you F fans have done to shed some lbs of the 750/900F Behemoth

VERY light wheels, VERY light exhaust, lighter RC51 front end, lighter Blackbird aluminum swingarm .......

SOMEDAY I will make a high strength steel thin wall tube frame. Not sure what else one could do to shed pounds .....

Posted: Mon Jan 11, 2010 7:38 pm

Liposuction.

Posted: Mon Jan 11, 2010 7:41 pm

motomoon wrote:

Liposuction.

I got rid of my wife ...... kinda the same thing Razz

Posted: Mon Jan 11, 2010 8:21 pm

I still believe that the two giant freakin' flywheels on the front and back
are the key to making these a really enjoyable machine....I betcha'
there is 50 lbs. in the wheels to lose.....

Posted: Mon Jan 11, 2010 8:38 pm

petrat wrote:

motomoon wrote:

Liposuction.

I got rid of my wife ...... kinda the same thing Razz

Cheaper too! (possibly) Laughing

Posted: Mon Jan 11, 2010 8:56 pm

Buy a CBR1000rr. Very Happy

but I like the other good Ideas there too

Posted: Wed Jan 13, 2010 7:35 pm

Jebbysan wrote:

I still believe that the two giant freakin' flywheels on the front and back
are the key to making these a really enjoyable machine....I betcha'
there is 50 lbs. in the wheels to lose.....

these numbers are rim & tire & bearings no axles shims
F2 front=25 lbs
F2 rear=35.2 lbs

Comstar front=29.2 lbs
Comstar rear=43.2 lbs

Thats a big differance. 12.2 lbs shaved off

Posted: Thu Jan 14, 2010 2:10 am

spike wrote:

Jebbysan wrote:

I still believe that the two giant freakin' flywheels on the front and back
are the key to making these a really enjoyable machine....I betcha'
there is 50 lbs. in the wheels to lose.....

these numbers are rim & tire & bearings no axles shims
F2 front=25 lbs
F2 rear=35.2 lbs

Comstar front=29.2 lbs
Comstar rear=43.2 lbs

Thats a big difference. 12.2 lbs shaved off

Cool...didn't know that anyone had weighed them...
12 pound is a lot...plus I have a tube in my rear..because
I-35 Honda couldn't get my damn tire to seal on the rim... Confused

Probably like 3-4 more lbs....

Posted: Thu Jan 14, 2010 4:01 am

Jebbysan wrote:

Cool...didn't know that anyone had weighed them...
12 pound is a lot...plus I have a tube in my rear..because
I-35 Honda couldn't get my damn tire to seal on the rim... Confused

Probably like 3-4 more lbs....

Absolute weight doesn't necessarily tell the whole story does it? Doesn't it depend on where the weight is distributed on the wheel? I'm thinking that a lighter wheel with more weight on the 'rim' would have more flywheel effect than a heaver wheel with less weight at the rim. Not sure how you'd assess the difference but I think you could get a sense by spinning the rims at a fixed speed then measuring the torque required to turn the rim perpendicular to it's axis of rotation.

Posted: Thu Jan 14, 2010 4:30 am

My 5.5" Carrozzeria rear wheel WITH cush, sprocket, rotor AND 180 tire only weighs 22lbs Cool

Posted: Thu Jan 14, 2010 4:48 am

Jebbysan wrote:

...plus I have a tube in my rear....

Sounds painful.... Razz

Posted: Thu Jan 14, 2010 11:17 am

Quote:

I'm thinking that a lighter wheel with more weight on the 'rim' would have more flywheel effect than a heaver wheel with less weight at the rim. Not sure how you'd assess the difference but I think you could get a sense by spinning the rims at a fixed speed then measuring the torque required to turn the rim perpendicular to it's axis of rotation.

Inertia. Yes, weight further from center has higher inertia. In the case of the F2/F2 wheels the reduction in both inertia and unsprung weight is significant.

Don't forget the hallow axles too, thats a 1lb or so right there.

Posted: Thu Jan 14, 2010 11:52 am

trekrider wrote:

Just curious what some of you F fans have done to shed some lbs of the 750/900F Behemoth

Put an 1100f motor in. That'll make it feel lighter on the straights Smile

Good info on the wheels.

Posted: Thu Jan 14, 2010 12:17 pm

If you can lose 10kg (22lbs) off your guts - will not cost anything. This is my lightening strategy to lighten my 750/900/1100. This advice was given to me by a dealer who raced an RCB/1100R for many years. Said this was the cheapest and easiest way to make a signifigant difference.

Posted: Thu Jan 14, 2010 1:38 pm

Pointdiver wrote:

Jebbysan wrote:

...plus I have a tube in my rear....

Sounds painful.... Razz

You don't know the half of it..... Laughing

Seriously though.....20+ pounds of unspung weight could do wonders!
If I lay off the Heinekens that would help too....but I do not see that in
the immediate future....

Posted: Thu Jan 14, 2010 6:54 pm

spike wrote:

Jebbysan wrote:

I still believe that the two giant freakin' flywheels on the front and back
are the key to making these a really enjoyable machine....I betcha'
there is 50 lbs. in the wheels to lose.....

these numbers are rim & tire & bearings no axles shims
F2 front=25 lbs
F2 rear=35.2 lbs

Comstar front=29.2 lbs
Comstar rear=43.2 lbs

Thats a big differance. 12.2 lbs shaved off

Just wondering if the #s you quote for the Comstars include the brake disks. When I took off the front wheel of my 900 it felt more like 40 lbs but I did not weigh it. I literally could not believe how much it weighed.

Posted: Thu Jan 14, 2010 6:56 pm

dhoff wrote:

spike wrote:

Jebbysan wrote:

I still believe that the two giant freakin' flywheels on the front and back
are the key to making these a really enjoyable machine....I betcha'
there is 50 lbs. in the wheels to lose.....

these numbers are rim & tire & bearings no axles shims
F2 front=25 lbs
F2 rear=35.2 lbs

Comstar front=29.2 lbs
Comstar rear=43.2 lbs

Thats a big differance. 12.2 lbs shaved off

Just wondering if the #s you quote for the Comstars include the brake disks. When I took off the front wheel of my 900 it felt more like 40 lbs but I did not weigh it. I literally could not believe how much it weighed.

no disc's

Posted: Thu Jan 14, 2010 11:36 pm

Lay it over ... and in my case you can relieve the bike of 340 lbs in one fail swoop!LOL Wink

Posted: Fri Jan 15, 2010 12:05 pm

when you guys talk about F2 wheels, what model motorcycle is that?

Posted: Fri Jan 15, 2010 12:10 pm

trekrider wrote:

when you guys talk about F2 wheels, what model motorcycle is that?

My and my wife's rims came off a 94 CBR 600

Posted: Fri Jan 15, 2010 3:40 pm

Hey,

So far I have just removed my center stand on my black bike. The silver bike is getting a mock up with a GS1100E swingarm and Marzocchi shocks. Once I have some more info I will post pictures. The rear end setup will eventually go on the black bike (once the bugs are worked out) with a lighter set of wheels hopefully.

Then I have a 99 ZX6 front (need a wheel still) and rear end I plan to use for the silver bike. That will include the beefy forks, super light Enkei wheels and nissin brakes. The bike is already started and it will also have no gauges, etc, just a head light and some warning lights, maybe a digital tach.

Wheels and body weight make a huge difference. Changing anything steel to aluminum (that can be) should help a lot. If you can afford Carrozzeria wheels, more power to you. They are like rolling art, wait, like your favorite supermodel made into a wheel.

Let us know, Grant.

Posted: Fri Jan 15, 2010 3:53 pm

elcman wrote:

If you can afford Carrozzeria wheels, more power to you. They are like rolling art, wait, like your favorite supermodel made into a wheel.

Yep, they sure are SEXY!

Food for thought ..... will "significant" weight reductions, like these exotic wheels, outweigh the performance on the track of what any significant engine mod's could provide?? A ported head, a big bore kit, hot cams, and FCR's is much more expensive than what these wheels cost. I expect anyone who invests $$$ in exotic wheels will also invest in the engine mod's too, but what is the better investment for someone that is on a budget? Idea

Posted: Fri Jan 15, 2010 7:26 pm

I am going to say between thewheel conversion and swing arm 900 to 1100 and lost the center stand My guess would be about close to 25 lbs I shaved off my bike.

Now if I lost 15 -20 that would be another few but thats a different story altogether

Posted: Fri Jan 15, 2010 9:18 pm

i know the comstars are more of a hindrance..not only in rotating mass but over-all circumference, too [bigger "gyroscopic" effect]

is there much difference between the 180-17 on an F3 wheel and the 140-17 on an 1100F wheel? i wonder if the bridgestones i am running are much heavier than say...a comparable pirelli or dunlap?

maybe in the world of all-out racing, a few ounces here and there would make a difference...if you add a few carbon fiber pieces, lighter wheels AND tires, run half a tank of gas instead of a full one, aluminum swing arm, air monoshock instead of two coil-spring shocks, drilled disks.......you could probably come up with a good 50lbs or more in weight loss.....that would be tough to do if you had to lose 50lbs off your butt Crying or Very sad

the biggest individual weight outside of the engine itself is probably the frame, and there is not much we can SAFELY do about that.

Posted: Mon Jan 18, 2010 8:20 pm

would any parts like the wheels/triple tree/forks etc from 750 nighthawk fit on a 750F?
looking at the 82-83 nighthawk specs it is almost 18KG lighter then the 750F

Posted: Mon Jan 18, 2010 9:14 pm

which nighthawk? i doubt there is much difference between the 750 F and the 82 or 83 nighthawk, except that the frame is a bit smaller...that may be where the difference is.