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To me, it sounds like the 70 lbs would be on full oh-shit braking.
The question about the other mounts is intriguing and, still, unanswered!
My bigger point is that I like the discussion of ideas here. Especial when people who are open to possibilities feel comfortable to say "What if" or "Maybe" with out being ridiculed. The implication by some that they know better and if you disagree, you know nothing, really shows how small some minds can be...
70Lbs, 7lbs, 70 foot pounds of pressure, transferred weight, acceleration, de-eceleration, rotating mass, center of gravity, forward momentum - all really interesting stuff, but really? A bunch of motocrossers pretending like they fully comprehend how it all works?
I like Bad10's real world application of physics.
I tried it.
It worked.
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Luxon 4-Post Bar Mounts
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IMO, I dont believe the 70lb claim as it seems physically impossible but I DO believe the OPs conclusion that the part does indeed work and that is the most important thing here. If it actually works, is it really that important what the manufactures claims are??
Zookie... Read about this bike and the invitations these "idiots" engineered into the chassis.. If you don't think relocating the engine 2mm will effect the CG, which in turns effects the handling, your not qualified to speak on this subject.
http://www.apriliausa.com/en-US/Model/20388/RSV4+Factory/Overview.aspx
I am not saying that this item does not help at all.
What I am saying is that 2mm in a motocross bike does not cause a bike to go from crap to awesome.
All I request is someone here does a proper blind test. The mind is a bitch and if you buy something that the mfg says it supposed to make your bike handle better, you may convince yourself of this fact.
Linking me to an Aprilia website doesn't really teach me a darn thing. Remember how aluminum frames are the best (thanks Honda!), and how a four stroke would make motocross the greatest thing since sliced bread (thanks Yamaha!)....once again, there is a reason people are marketing specialists.
I don't have a YZF, but if some folks with them and these parts would like to do a real test on them and are in the Michigan area I would love to coordinate a test with blind testing of the parts and the bikes to figure out if there actually is an appreciable difference from 2mm of movement in the engine. I bet the composite CG moves less than 1mm forward. If the bike is this sensitive to changes in CG (I am being very sarcastic) then you would surely feel a difference in handling when you add a full (VERY heavy) graphics kit to your bike, or heavier bars, or half the other heavy accessories people put on their bikes.
Have a lighter aftermarket exhaust? Lighter item at the back of the bike moves the composite CG of the sprung elements forward, so it should have the same effect as moving the engine forward. Do you run a full skidplate? That would make the composite CG go downward, should change handling right?
What if I sold you a really, really, really light exhaust saying it also helps handling by moving the CG forward. I bet my customers would say the bike handles way better with it.
I'm done here, I have experience in testing vehicles. I have firsthand experience with testing parts and telling people what they should do and they think they do that, when in fact we changed nothing, or did something negative to the vehicle.
Fin.
Aprilla uses tunable engine mounts on there high end race bike to allow for CG adjustments.
I also agree it would be fun to test this product. First by carefully making before and after weight measurements.. While i was at it, I'd like to measure the effects of changing your fork height and messing with the static sag.
If lightspeeds product transferred 7 lbs to my front tire, I'd be all over it..
What I disagree with for much that is sold in the motocross world is sold based on marketing bs. Much of what is sold in the automotive world that I work in right now is based on marketing. That's how business works, so good for them.
Tomorrow after work I may just call them and ask what kind of testing they have done.
As has been said, this needs a blind test to be confirmed.
This sport is all about confidence so if these spacers gives you confidence then please buy them and support lightspeed.
Careful with fork height and static sag...you are also changing chassis geometry tremendously in these cases and this is where these have the effect on the bike.
You can transfer 7lbs to your front tire if you ride a bit more forward on the bike....
Pit Row
We ran this kit. It works. It works REALLY WELL.
Combine it w/ some Enzo suspension and you've got a Yamaha that thinks it's a Works Bike.
I have been pondering how the mounts can all line for some time now, even to the point of exhausting an internet search for the answer. Which left me still pondering. Even the Light Speed site itself, has no install info.
Sounds like a great idea, just don't care for the sloppy motor mount holes. That may cause vibration problems, like frame fractures and the such.
Look who's talking.
Post a reply to: How to make your 2010-12 Yamaha YZ450 turn like its on velcro.