battery?/starter? issue

[Chris Krok]

> What you want in a replacement fastener is a cap screw or bolt with a > metric grade of 10.9.

I thought the ones on the bike were already 10.9? I seem to remember that stamped into the head of the SHCS upper screws, and being surprised. (I upgraded mine after Russell'r's went kaput.) I'll have to check when I get home to be sure. I managed to find some 12.9's to replace them with. C -- Dr. J. Christopher Krok Project Engineer, Adaptive Wall Wind Tunnel Graduate Aeronautical Laboratories, California Institute of Technology MS 205-45 Phone: 626.395.4794 Pasadena, CA 91125 Fax: 626.449.2677

[jake_sagebrush]

If you will allow a little time, I'll look at the hardness/tensile strength of the stock bolts, and see if a tougher replacement is available from one of my suppliers. Jake www.sagebrushmachine.com

[bradcdavis]

--- In DSN_klr650@y..., "jake_sagebrush" wrote:

> If you will allow a little time, I'll look at the hardness/tensile > strength of the stock bolts, and see if a tougher replacement is > available from one of my suppliers. > Jake www.sagebrushmachine.com

That sounds like a good plan to me. Let us know when you have found something and if it is available in SS. I don't really think it has to be SS but if it is available, why not? Brad

[TLrydr@aol.com]

In a message dated 2/4/02 10:26:13 AM EST, bradcdavis@... writes: > strength of the stock bolts, and see if a tougher replacement is > available from one of my suppliers >>

[RM]

On Mon, 4 Feb 2002, bradcdavis wrote:

>That sounds like a good plan to me. Let us know when you have found >something and if it is available in SS. I don't really think it has to >be SS but if it is available, why not? Brad

The strongest SS fastener I can find is a metric class A4-80, which is made from 316 stainless. It has a tensile strength of 116,000psi which makes it equivalent to an ordinary everyday class 8.8 steel fastener and its yield strength is actually slighty lower. A 12.9 fastener, by comparison, has a tensile strength of 177,000psi. Your typical off-the-shelf SS fastener is even weaker. I suggest saving the SS for body panels. RM

[Chris Krok]

> From: "Eduardo " > Subject: Subframe failure mode? > > What part of the subframe attachment fails? > > The upper bolts, lower bolts, welds? > Do they shear, bend?

Like Stu said, the upper bolts break. I think the stock ones are grade 10.9, and you can upgrade them to 12.9. If you want to go all the way, you can drill through and install a through-bolt, either on your own or with a kit. Under very heavy loads, however, you can also crack the main frame spine at the connection point. A friend of mine rides two-up offroad a bit, and this happened to his bike. I've also heard of it in one other case. However, you really have to push it to do that. Riding two-up is the real killer because it puts the weight so far back. If you're riding solo, you probably won't have a problem. I'm 235 lbs and have ridden offroad with full camping gear, and haven't cracked the frame. Krokko -- Dr. J. Christopher Krok John Lucas Adaptive Wind Tunnel Caltech MS 205-45, Pasadena, CA 91125

[RM]

On Fri, 17 Jan 2003, Chris Krok wrote:

>A friend of mine rides two-up offroad a bit, and this happened to his >bike. I've also heard of it in one other case. However, you really have >to push it to do that. Riding two-up is the real killer because it puts >the weight so far back.

Having the rear suspension smack bottom over and over again doesn't help much either. An aftermarket rear spring is pretty much mandatory if two average-sized adults are going to off-road two up. RM

[Bogdan Swider]

> I think the stock ones are grade > 10.9, and you can upgrade them to 12.9.

Krokko

> --Dr. J. Christopher Krok > John Lucas Adaptive Wind Tunnel > Caltech MS 205-45, Pasadena, CA 91125 >

I hope you don't mind if I play ask the rocket scientist - and anyone else. The bolt that holds my Slipstreamer windshield to the handlebars breaks eventually. If this happens at speed I lose bracket hardware. I just bought some extras at Ace. The man said his strongest bolts were the stainless steel ones. He didn't mention or did I see written any numerical classification. How and where can I get the strongest bolts. They're SAE, 5/16 x 18 pitch x 1 1/4. Jake knows this kinda stuff too but he's been kinda quiet lately. Bogdan

[Bogdan Swider]

Oh yeah, they're Allen heads. Bogdan

> How and where can I get the > strongest bolts. They're SAE, 5/16 x 18 pitch x 1 1/4. Jake knows this > kinda stuff too but he's been kinda quiet lately. > > Bogdan > > List sponsored by Dual Sport News at www.dualsportnews.com. List FAQ > courtesy of Chris Krok at: www.bigcee.com/klr650faq.html > Unsubscribe by sending a blank message to: > DSN_klr650-unsubscribe@yahoogroups.com . > > > > Your use of Yahoo! Groups is subject to > http://docs.yahoo.com/info/terms/ > > > >

[Zachariah Mully]

> I hope you don't mind if I play ask the rocket scientist - and > anyone else. The bolt that holds my Slipstreamer windshield to the > handlebars breaks eventually. If this happens at speed I lose bracket > hardware. I just bought some extras at Ace. The man said his strongest > bolts were the stainless steel ones. He didn't mention or did I see > written any numerical classification. How and where can I get the > strongest bolts. They're SAE, 5/16 x 18 pitch x 1 1/4. Jake knows this > kinda stuff too but he's been kinda quiet lately. > > Bogdan

AFAIK, stainless steel is usually less strong, especially considering that your hardware store probably isn't carrying high grade ss fasteners. I would look for bolts that 10.9 or 12.9, the boxes should be labled with this if they've been rated. I'm lucky, my local hardware store has a great assortment of 10.9 and 12.9 bolts. Z DC