Posts
4188
Joined
3/11/2015
Location
Santa Fe, TX
US
Fantasy
3719th
Edited Date/Time
9/28/2018 9:20pm
I found a pretty low hour bike at a decent price. Bike has 20 hours and I got it for 4300.00. It cleaned up pretty good. I’m using aer cone valve air forks to save 4lbs over spring fork. The bike being a 150 don’t see an issue with the forks, all ti bolts, still looking for axles, !Think! seat foam, sm pro wheels and are only 8 ounce total over the stockers, kehin carb, x trig clamps, sxs. Billet calipers, ti pegs have not decided which ones yet, either bills or pc carbon silencer, along with fmf fatty pipe, and whatever else I can do to keep the weight down and be reliable. I will use the stock shock for now they are pretty good valves and sprung.
The day I got it and and after a good bath.
Quick rear down and rebuild. I’m working on changing most of the bolts out and whatever I can as I go back together.
If any one has ti axles, pivot, or think seat foam for sale please email me.
Robertmartin517@yahoo.com
The day I got it and and after a good bath.
Quick rear down and rebuild. I’m working on changing most of the bolts out and whatever I can as I go back together.
If any one has ti axles, pivot, or think seat foam for sale please email me.
Robertmartin517@yahoo.com
Pro pegs mud version
Motion pro wheel locks
motostuff rotors(had ti rotors but didn't like them)
arc melon levers
Think seat cover & bar pad
warp 9 makes the axles & pivot the cheapest I've seen.
The Shop
WPS distributers can get you DRC aluminum bolts, which are lighter than Ti, for low-torque areas like fork guards, certain fenders, case savers, perches, etc.
https://www.ebay.com/itm/Aluminum-Flange-Bolts-Ti-Color-M6X12mm-20-Pk-D…
Don't forget the lightest tubes you can get away with (IRC cheapies for me) and tire combos: Pirelli MXMS and the new Michelin's are supposedly some of the best at the moment in this regard?
Ps: The PHDS mounts are nice in action, but heavy on the scale! Better off with OE 1.125" mounts and Pro Taper EVO bars (no crossbar) if weight is priority numero uno
Ti on the engine hangers may shave off a few gram's, and more importantly get rid of the Torx heads...
thats going to be trick!
i've just sold my lightened kdx220, every possible bracket/lug off, 200 bottom end(much smaller ignition set up), kx 125 bits and peices, light tyres tubes, au bolts everywhere, etc (moving home) and boy do i miss that bike, i could litereally shove it into any line at any time.
The RK MKU is a nice chain but it is an o ring if I remember correctly. I’ve never tried the Sunstar MXR1. For about the same price you can get, (my personal opinion) the lightest nicest chain I have seen the EK 520MXR 3D.... it looks like jewelry ?
https://goo.gl/images/KTzwRU
Ti axles & linkage bolts best bang for your buck along with Aluminum bolts on the non critical parts. Then with whatever $$$ left over sprinkle in your Ti hex bolts & nuts where you like :-)
Do they make a Ti rear spring for that shock? I’m sure someone must.
PC carbon / Ti shorty is the way to go for silencer.
Lightweight tube for rear & fat tire mtb tube for front.
Pirelli for tires.
Light weight seat foam if you don’t spend a lot of time in the saddle... LoL
Pit Row
I just weighed my modded Cr and it was 90kg. But my tyres are heavy so will be 89kg soon. It's just so much lighter than my 450 I actually laughed when I first rode it.
"Most aluminum alloys lack such a fatigue limit, so they accumulate fatigue damage steadily under stress cycling. This is why airframes, wings, etc. have a "lifetime" or service limit."
Yes, aluminum has a fatigue limit, however, you will likely be dead and buried long before an aluminum axle reaches that limit in this type of application. Kaiser aluminum does fatigue tests on their aluminum and the test on the 7075 is ten million cycles. Also lot of force must also be applied to aluminum before it appreciably contributes to the fatigue of the metal, and this force is fairly high. For example, if you bolt the end of a 1" round bar of aluminum to a vice, leaving 12" of the bar exposed, then apply 1 lb of force to the exposed end of the bar and do it a bazillion times, the axle will still not have fatigued enough to fail. The greater the force applied, the sooner a failure will occur.
You also state that airplanes are made of aluminum, and my guess is that you have flown in one before, and that if you did, I'm also guessing that you didn't worry about how many fatigue cycles it had been through, but I could be wrong. Irregardless, I for one would much rather have a part break from fatigue when I drop from 10 feet in the air instead of when I drop from 35,000 feet in the air.
7068 aluminum is also much stronger than what aviation typically uses, although all aluminum still has a fatigue limit.
There are also cars that have aluminum frames. The 2013 and earlier BMW M6 is one of them, plus, many motorcycles, including many motocross bikes have aluminum frames and aluminum swing arms and aluminum handlebars, and aluminum engines, aluminum wheels and aluminum sprockets etc, yet people don't seem to be concerned about these parts breaking in half from fatigue.
They have also been making connecting rods and rocker arms out of aluminum for racing engines for around 40 years, and many street racers have over 100,000 miles on their rods and rocker arms.
Steel can and does also occasionally fail. I had many steel motocross bike frames develop cracks and also cracked many when I worked in the R & D department of Kawasaki Motors.
If one is concerned about an aluminum axle reaching its fatigue limit and failing, they can simply replace it periodically, like after every 5,000 hours of riding etc.
Axles can also be made out of "Giga steel" (alumasteel) but that is not easy to obtain at this time.
Thanks in advance for any help.
That question is actually irrelevant. There are very few companies making axles from titanium even though it is extremely strong and readily available and there is a reason for that also, however, below is a link to one company that currently makes aluminum axles and there are one or two others. The axles below are for drag race and road race bikes that go in excess of 130 mph with some bikes weighing maybe 40% more than many late model motocross bikes.
https://www.saeoutlawperformance.com/CBR-conversion-axle-for-GSXR-1000-…
"In addition aluminum is 1/3 the stiffness of steel based alloys no matter what alloy or heat-treat it may be. A very simple example could be If we put an equal size steel bar & an alum bar in a wall & start to hang equal weights on the ends of these bars the bars deflect elastically under the load. As we add load equally, that the aluminum bar is deflected three times as much as the steel."
This is also irrelevant since all metals will in fact "bend" under a certain load. The thing that is relevant is simply designing the part in question so it will perform sufficiently for its intended use.
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