Did the stock bike actually come it at 415 lbs with a full tank off the showroom floor?

 

The stock bike came it at 406 with 10 liters fuel.

 

We just completed the first Graves Spec Kawasaki ZX-4RR Supersport build. The bike weighted in at 341.72 lbs. I would say that this is a good starting point.

We will post detailed photos and build specifications soon.

You can't come on here, post numbers like and no other details. Teasing us like that isn’t allowed.

 

You can't come on here, post numbers like and no other details. Teasing I’d like that isn’t allowed.

He is @Chuck Graves and does what he pleases!
Haven't you been following the forum?
He and @Gravesport have been teasing full exhaust dyno results for almost 2 months now.

 

We just completed the first Graves Spec Kawasaki ZX-4RR Supersport build. The bike weighted in at 341.72 lbs. I would say that this is a good starting point.

We will post detailed photos and build specifications soon.

with how much fuel in it?


how are you weighing it?

I bought 3 decent scales to try to weighing it, with one under each wheel and one under the kick stand but even with creating plates to spread the weight across each scale the results are not consistent enough to be really useful

 

He is being such a tease.

 

Full transparency would be nice.
Secrets keep the money flowing in other directions. 🤷🏼‍♂️
Just saying.

 

Full transparency would be nice.
Secrets keep the money flowing in other directions. 🤷🏼‍♂️
Just saying.

Im also genuinely curious about this. Graves was the first out with a slip on, sounds/looks great and is the only one available. So i didn't wait for others to hit the market and i bought one. In the car world, everyone tries to be the first out with products. Some even do pre orders knowing the product wont be out for weeks. Im new to be bike world so Im not sure how these things work. Should I crank up my patience? Lol. Either way, im glad there is enough interest in this bike for companies to make parts for it.

 

We just completed the first Graves Spec Kawasaki ZX-4RR Supersport build. The bike weighted in at 341.72 lbs. I would say that this is a good starting point.

We will post detailed photos and build specifications soon.

Chuck,

I can't wait to see what you have come up with.

I have started a spreadsheet for my build and will finetune the actual weights, as I measure each actual item.

William
Santa Cruz, Ca

ZX4RR weight and build sheet

 

You might see if you can use the scales that can be found at truck stops. There might be a charge, but that might be a way to reliably weight your bike.

 

I'm a truck driver and know that the truck scales are accurate for tons, not 300-400 pounds accurately.
Also the truck scales are separated for Steering tires, drive tires, and rear axle.

Last the DOT guys in the building would look in disbelief having a motorcycle get on the scales. 😂😉

Good suggestion though. 👍
Individual wheel scales like they use to corner balance a car would be the most accurate way to measure a bike using two scales.
I think that's already been mentioned on this topic

 

The scales I use to weigh small airplanes are pretty accurate for motorcycles.

 

I was going to go this route on my wife's bike, as I have aviation friends.
I would do a front/rear/side stand first to make sure the total weight was accurate, then stand the bike to two points, and see the weight bias.
At the end of the day, there is more weight to be lost from the rear, until some front wheel and hardware options hit the market.
The @SCracing tail tidy weighs 11-12 ounces, depending on the hardware used to mount it, and the tag bolts.
It includes stainless hardware and nice aluminum tag bolts from Driven Racing. Aluminum mounting bolts and plastic tag hardware are the lightest option.
The stock tail/fender is 3lbs, 10 oz.
The bike lost 3lbs there roughly.
The Yosh Hepta SS/TI should drop another 9-11.
Switching the battery to Lithium will lose TBD?
I am going to pick up some block off plates, and lose the charcoal can and hoses on the left front too.
Two great benefits of the Yoshimura Hepta low mount is there is no can in the way of your boot, and you can get rid of both rear passenger pegs, because you do not need a hanger on the right side of the bike anymore for a can.

 

Way to go!

 

All it takes is money and time. This ZRX of mine has lost over 100 lbs from its stock weight.

 

@Pmack @AV80R I have a brand ne bike coming into the shop tomorrow right off dealer showroom, we will fill it with gas and take weight and then do mine right after to see where were at at the present time. like I always mentioned with the N400, the bike is not that heavy and quite nimble, yes putting the ZX4 on a diet is somewhat needed but not necessary. guys that weigh a buck something soaking wet don't have to worry about to much after the exhaust change. older guys hold on a few more donuts that they care for may want to do more. if DP26 can lug around a motogp bike, then the rest of ya stop complaining about 3xx lb bike !!

 

I'm not complaining, but the wife is used to a N400! My target for her street legal bike is 385 full of fuel.
Fender eliminator, low mount exhaust, scrap the passenger hangers/pegs, and a lithium battery should put it really close.

Less weight is better power to weight ratio as you know.
I have dropped 40lbs since I met you at Jennings about a year ago now?
A N400 moves me along much better at 190lb vs 230lb.
Cheaper to take the weight off of me than off of 6 different bikes!

 

@AV80R , Is that a Christen Eagle in your avatar?

 

Yep, Christen Eagle II

 

@Pmack I'll post the weights of both bikes tomorrow just to see where we're at. wheels and the exhaust will be the 2 that make the most difference .

 

if only there were wheels to buy!!!

 

@vcyclenut oh there is, only problem is getting them and how much they will be. I'm working with MOS to hopefully have these built and get them to some of us that have the MOS on our N400s and the new guys on the block that want a nice wheel at a very reasonable price !

 

so if we cant but them , I stick by if only there was some we could buy, lol

 

Update on my new battery.

 

That's what I'll have soon enough. 🤞👍

 

We just completed the first Graves Spec Kawasaki ZX-4RR Supersport build. The bike weighted in at 341.72 lbs. I would say that this is a good starting point.

We will post detailed photos and build specifications soon.

Hey Chuck. Someone just showed me pictures of your bike with race bodywork and a sign claiming 80+ hp. Inquiring minds want to know all kinds of things like, "What bodywork"? and How did you gain nearly 8hp over your slip-on with flash dyno charts you had posted? What can you share?

Mike Norman
G-Force Performance Center

 

Full systems are shipping. If you haven’t put your name on the list then I’m pretty sure that they are sold out already, more are coming shortly. ( mid to late june )
Bodywork is in production. I would get in Q if you are serious.

 

Full systems are shipping. If you haven’t put your name on the list then I’m pretty sure that they are sold out already, more are coming shortly. ( mid to late june )
Bodywork is in production. I would get in Q if you are serious.

Will do. Thanks

 

Coming from a world of AntiGravity and Braille batteries in the car world it's nice to see these other companies mentioned like the SpeedCell and Full Spectrum Power. 👍

Having used Braille in my drag car years ago the weight was immensely different from the OEM lead acid batteries.

Good info guys and appreciated.
Time for some research and decision making for the right battery for the bike. 😎

 

I installed the Yosh Hepta low mount and tail tidy from @SCracing, along with block off plates and tune from TST and @sbk1198 on Friday night.
The low mount requires no hanger, so both passenger foot peg brackets go to the lost weight pile.
Block off plates and tune allow the charcoal can, o2 sensor, and AIS ststem to go too.
Installed a Firepower lithium battery too that was in her N400.
The bike lost 26-27lbs, and gained 20-25 hp up top.
Pulled the stock tires and put some S22s on for the mountain run, we will see how they do but I have high expectations based on N400 experience.

Sitting in a hotel waiting until the weather clears at the moment. Bike felt great for the few miles I rode before I loaded it yesterday.
New Pitbull restraints are on point.
Yosh sounds amazing!

 

@Pmack best looking full exhaust out there..sounds absolutely amazing too hands down or up !!!

 

This is the spreadsheet I have built for the ZX4RR. I will weigh each part removed to adjust the exact weight, but this should be a very close approximation, based on past builds.

ZX4RR weight March 21 2024

docs.google.com

I will scale the bike stock with a full tank this week.
Example of scale with a VF500F I just picked up.

William

 

This is the spreadsheet I have built for the ZX4RR. I will weigh each part removed to adjust the exact weight, but this should be a very close approximation, based on past builds.

ZX4RR weight March 21 2024

docs.google.com

I will scale the bike stock with a full tank this week.
Example of scale with a VF500F I just picked up.

William


View attachment 1099
View attachment 1100

That doesn’t look like your ZX-4RR on the scale.

 

VF500 is a fantastic bike, that was the first proper street motorcycle I rode, plenty of smooth torque, doesn't complain about revving out, makes a great noise too. Too bad they like to drop valves.

 

ZX4RR on scale, weighs about 22lbs lighter.

 

That’s a great scale. What is it?

 

I have a commercial building with a massive commercial warehouse. Multiple Toledo floor scales. I’ve weighed scores of bikes on it. It’s good to the pound.
I formally warehoused all the motorcycles for the dealerships in our area back. We had all the all the brands. I was always impressed with KTM as they weighed as quoted in their manuals/spec sheets (sans gas).

William
Santa Cruz, Ca

 

 

That's right where I'm at for a dry weight (minimum fuel) for mine.

 

I'm at 361 lbs dry (minimum fuel) and 385 lbs wet (full fuel, full oil to top of sight glass). The heavy stock steel sprocket is next on my hit list. The rear swingarm is worth another 5 lbs savings and I can't wait to replace the wheels, axles, swingarm pivot, and steering stem.

 

The rear swingarm is worth another 5 lbs savings and I can't wait to replace the wheels, axles, swingarm pivot, and steering stem.

What are considered options for wheels?