Weight reductions

[cbinker]

I am starting preparations for setting my bike up for the 2013 Pikes Peak Hill Climb.
1. I plan on losing 10-15 pounds my self, going from 175-180 to 160-165.
2. Race body work is coming possibly over winter.
3. I have removed the air box and replaced it with a K&N universal filter.
4. Re-jetted and dynoed everything is pretty smooth.
5. Muzzy slip-on pipe.
6. GSXR rear shock, looking at getting dog bones from rexbo, just waiting to get paid.
7. need to do some front suspension work, probably going to raise triples to the top of the forks.
8. my bike needs a diet, but i dont know where to start, I have heard of people getting down to 300#s.

[jp129]

We should make a sticky to reference all "weight loss" programs, since the search yields scattered results.

The challenge is losing weight while keeping a bike compliant to class rules. If you do not have rules to adhere by, let your imagination run wild...

But a few off the top of my head:

-Track plastics to delete lights, mirrors, & rear seat
-Lose all misc/unnecessary brackets (Passenger pegs, exhaust hanger, wire clips, etc)
-Lose anything with a lock (gas tank lock, seat lock if using track plastics, ignition switch)
-Remove misc/unnecessary covers (Sprocket, chain guard, battery cap)
-LiPo battery
-Clip-ons & rearsets
-Lose the OEM exhaust for a full system or slip on
-Lose the radiator fan
-Lose the OEM coolant overflow for a smaller contraption
-Lose the rear brake fluid reservoir for tygon tubing + plug
-415 chain setup
-Lose stock cluster + front fairing stay
-Lose airbox
-Lose emissions system and cap of SAI system
-Aftermarket wheels
-Lose speedo gear/cable
-Lose your left side handle bar controls
-Run enough fuel in your tank for your purpose

[Rexbo]

you can cut the rear subframe right behind the rear seat where the two frame tubes come together, lose like 10 lbs that way. Also cut the kickstand mount off, trim the front fairing stay, lose random brackets that hold stuff like the OEM coolant reservoir, lose the front sprocket cover, get rid of all the stuff on the wiring harness you don't need, etc.

[dino74]

You could mill or drill out the rear rotor.

[Nemesis]

Is this for a race org? If so, make sure all those weight reductions are legal. Some classes do not allow you to make any modifications as suggested.

[alex.s]

in addition to the above you can also replace coils and plug wires with coilover plugs (-5lbs), and lose the extra cooling utils (thermostat and temp sender unit, about 2lbs- you dont need it when you dont have gauges)

[alex.s]

you probably dont need a seat. the left handle bar also seems optional...

[cbinker]

I just skimmed through the 2012 rule book for the Pikes Peak hill climb and there are no restrictions on weight. but i noticed in the 250 class that most bikes were Super Motos.

[tapdiggy]

Originally Posted by cbinker

I just skimmed through the 2012 rule book for the Pikes Peak hill climb and there are no restrictions on weight. but i noticed in the 250 class that most bikes were Super Motos.

Pikes Peak used to have gravel.

[cuong-nutz]

One of our local Guys just back from Pikes peak I'll see if I can cross link the thread. Later

[htdub]

Just removed my left controls, ignition tumbler, wiring harness, that was almost 4lbs there.

[Mountain Dew]

Remove all the fluids. The "dry weight" is always way less than the "wet weight."

[dino74]

Originally Posted by cbinker

I just skimmed through the 2012 rule book for the Pikes Peak hill climb and there are no restrictions on weight. but i noticed in the 250 class that most bikes were Super Motos.

Page 75 from http://director.usacracing.com/ppihc...s/rulebook.pdf (I think this is the rule book)

C. 250 cc 2-stroke & 4-stroke single or twin cylinder.

I think a 250cc 2-stroke would kill the 250cc 4-stroke ninja.

Just out of curiosity, is an FI system preferred given the elevation changes?

[Penguin1120]

Originally Posted by dino74

Page 75 from http://director.usacracing.com/ppihc...s/rulebook.pdf (I think this is the rule book)



I think a 250cc 2-stroke would kill the 250cc 4-stroke ninja.

Just out of curiosity, is an FI system preferred given the elevation changes?

Yea I'm thinkin the carb'd bike is really going to run out of breath climbing that high. Sometimes I ride through the mountains in blue ridge parkway (approx. 3-4000 ft) and the bike really does have a hard time.

[Rexbo]

Originally Posted by htdub

Just removed my left controls, ignition tumbler, wiring harness, that was almost 4lbs there.

How'd you get the ignition tumbler out?

[cuong-nutz]

@cbinker: http://www.motohouston.com/forums/sh...ght=pikes+peak

@Rexbo: http://www.ninjette.org/forums/showt...t=triple+clamp

[choneofakind]

Originally Posted by Penguin1120

Yea I'm thinkin the carb'd bike is really going to run out of breath climbing that high. Sometimes I ride through the mountains in blue ridge parkway (approx. 3-4000 ft) and the bike really does have a hard time.

jet it so it pulls like a mofo. then go down one main jet size? that would split the difference maybe?

[alex.s]

Originally Posted by choneofakind

jet it so it pulls like a mofo. then go down one main jet size? that would split the difference maybe?

the answer is obviously turbo.

[cbinker]

I checked out the 415 chains, and what i found recommends 18 front and 57 rear, are they that light weight you can go up 4 in the front and 12 in the rear?

[jp129]

Since the 415 pitch is vastly different from the 520 in size, the recommended ratio will get you close to the stock 520 ratio.

IIRC, they said the weight difference is around 2~3lbs.