KR weight savings

The Place for archived technical posts, the KR-1 Manual, the KR-1S suppliment and parts lists.
Post Reply
User avatar
KR-1R
Premix Junkie
Posts: 1328
Joined: Wed May 16, 2007 2:24 am

KR weight savings

Post by KR-1R » Sun Nov 04, 2018 9:07 pm

To gather information on weights of parts ... where some easy savings can be made
approx. density steel: ~8000kg/m³ ____ titanium: rd 0.6x steel ____ aluminium: rd 0.35x steel ____ carbon fiber: rd 0.2x steel

Wheel Bearing Spacer LINK
Front: Standard (steel) 143.12g >> 52.8g Aluminiun
Rear: Standard (steel) 123.68g >> 45.4g Aluminiun

Swingarm bearing spacer LINK
Steel 502g >> 300g titanium >> 175g aluminium >> 100g carbon fiber

KR-1S 20mm Swingarm pivot bolt LINK
(KR-1 pivot is dia 15mm)
KR-1S can use RGV VJ22 hollow pivot, afaik VJ21 is also 20mm, differ in head end

KIPS motor and Frame LINK
The KR-1 KIPS servo (Exhaust Valve Operating Motor) weighs in at 884 grams (with two cables and bracket)
the GSXR/ZX6 servos have the right connections already save 400+g

Wheels complete LINK ...LINK2
KR-1 23kg with rotors
KR-1S 29kg without rotors
Front wheel completely bare KR1 = 3.70Kg KR1-S = 4.40Kg
generally more spokes = more weight
Ideal replacements Technomagnesio 5 spoke H sections

Exhausts and Mufflers?
Standard chambers 10.7kg
Kit chambers 4.7kg !

Side stand
steel kick stand ?? kg
side stand bolt (92002-1813 I/X) ?? kg

>> SOME MEASURED BOLT SIZES HERE <<
Last edited by KR-1R on Mon Nov 12, 2018 10:41 am, edited 12 times in total.

User avatar
500bernie
Premix Junkie
Posts: 3036
Joined: Mon Aug 02, 2010 10:22 am
Location: Teesside

Re: KR weight savings

Post by 500bernie » Sun Nov 04, 2018 11:53 pm

Great info Danny
Cheers
Bernie 8)
2 Firecracker Red and Grey C3s
Image

Gerrit
Heavy Smoker
Posts: 275
Joined: Fri Jun 26, 2009 12:09 am
Location: Kingdom of the Netherlands

Re: KR weight savings

Post by Gerrit » Mon Nov 05, 2018 12:00 am

I've bought a ZX-6 servo motor as a potential replacement for the standard KIPS item for my project, but haven't figured out a way to test cable travel yet. The cables themselves will have to be custom made, but that is a minor point.
"Mine is a long and sad tale", said the mouse.
"Indeed it is", said Alice, looking at the mouse's tail.

Gerrit
Heavy Smoker
Posts: 275
Joined: Fri Jun 26, 2009 12:09 am
Location: Kingdom of the Netherlands

Re: KR weight savings

Post by Gerrit » Mon Nov 05, 2018 5:57 pm

Magnesium is another potential weight saving material as it's about 2/3 the weight of aluminium.
"Mine is a long and sad tale", said the mouse.
"Indeed it is", said Alice, looking at the mouse's tail.

podman
Heavy Smoker
Posts: 343
Joined: Sat Jun 27, 2015 10:51 am

Re: KR weight savings

Post by podman » Mon Nov 05, 2018 8:58 pm

Theres a 10BHP difference between my bike and my friends KRs but he's nearly 2 stone heavier than me so the bikes are nigh on neck and neck in a straightline..

Not as exciting as magnesium parts for sure but a rider diet rather than a bike diet could make a bigger difference for us middle agers!

User avatar
KR-1R
Premix Junkie
Posts: 1328
Joined: Wed May 16, 2007 2:24 am

Re: KR weight savings

Post by KR-1R » Thu Nov 08, 2018 6:30 am

.
.
I will repost this from 2013 because the pics are pretty and 3D printing the arrows and positioning took time :lol:
will also appeal to the polishers

The aluminium exhaust bolt (£4ea) plus nut represents good value for weight.
The look of pillion footrest using flanged bolt instead of full head socket grew on me

Image

^^^ the swingarm bobbin is a genuine kawasaki item. A weight gain here but solid stainless

Image

silencer bolt is M10x55 x1.25 race spec'd 7075 T6 - the same ultimate tensile as A316 but 66% lighter.
Get an alloy nut (steel insert) to go with it for almost the same cost again on top.
https://www.pro-bolt.com/alloy-race-spe ... tched.html

Image

Post Reply

Who is online

Users browsing this forum: No registered users and 2 guests