older 600 question - Page 2

goof2 · 08-17-2009, 06:17 PM

Quote:

Originally Posted by derf

I'm looking for a project that I can spend time on. My current plans are to use a good majority of the frame and attach a sidecar to it. I want to use the stock steering head and keep the imprinted Vin number. This way I have the opportunity to still register and insure it for street duty if I feel like. I've been drawing designs on napkins as my preliminary sketches before i put it into a CAD program. one of my reasons for using a much older sportbike is the steel frame, I can weld steel, I can weld aluminum but I do a crappy job with aluminum.

My initial guesses are that I would be able to maintain the stock rear swingarm (slightly lengthened) and the stock tripple trees with a custom suspension and more hospitibal steering angles.

Right now is just the reaserch part, cost estimates, parts stuff like that.

I would think the parts you would be able to carry over would depend on what you want to do with it. If you are keeping stock wheels and tires you should be able to carry a lot over with less modification. If you want to use wheels and tires like those used in the picture you posted very little would carry over.

derf · 08-18-2009, 01:32 AM

I would go cheap and use the stock rear rim, and a second rear rim up front. Considering I would have to redesign the front suspension anyway to make it possible to turn at speed, I would have the ability to use a wider motorcycle rim. This photo might give you a better idea of what I am thinking, its just a crappy picture and almost too small to see.

derf · 08-18-2009, 01:34 AM

better picture

Dave · 08-18-2009, 02:09 AM

i call ballast for the test ride

derf · 08-18-2009, 02:15 AM

we shall see how I do in court in sept

derf · 08-18-2009, 02:45 AM

And if this makes any sense to anyone other than me, this is how I would do the 3rd wheel assembly.

Green is a car spindle (rwd car no driveshaft through it)
Blue are ball joints(upper and lower)
red are heim joints
black is frame tube

upper ball joint would be fixed against a load bearing hoop
lower ball joint would be on a single A arm, adjustable for caster
the front heim would be adjustable for toe

The 3rd wheel would be based off of a mcphearson strut assembly, without the actual moving suspension (3rd wheel suspension has a habit of flipping the car mid corner). The structural hoop would replace the strut and be fixed. This design gives maximum adjustability while requiring the least amount of space from the passenger platform

dReWpY · 08-18-2009, 03:45 AM

whisky foxtrot tango

marko138 · 08-19-2009, 03:37 PM

Quote:

Originally Posted by drewpy

whisky foxtrot tango

goof2 · 08-19-2009, 09:33 PM

It looks like a good design. You have the adjustability you need while still keeping it simple. The thing I would be especially cautious of is where the sidecar structure was mounted to the rest of the motorcycle. Make sure all attachment points are solid with no flex (I'm primarily thinking the subframe). It would be a bit of a pain to hit a bump and have the geometry of the sidecar wheel change.

Mrs. Colleen · 08-19-2009, 10:21 PM

My bike (92) was in good condition when I got it and it was about $1700. So I would imagine you could find a more beat up one for a grand or so

08-18-2009, 01:32 AM	#12
derf token jewboy Join Date: Nov 2008 Moto: CBR 900, KLR ugly ass duckling, Gas Man Posts: 10,799	I would go cheap and use the stock rear rim, and a second rear rim up front. Considering I would have to redesign the front suspension anyway to make it possible to turn at speed, I would have the ability to use a wider motorcycle rim. This photo might give you a better idea of what I am thinking, its just a crappy picture and almost too small to see. __________________

08-18-2009, 01:34 AM	#13
derf token jewboy Join Date: Nov 2008 Moto: CBR 900, KLR ugly ass duckling, Gas Man Posts: 10,799	better picture __________________

08-18-2009, 02:09 AM	#14
Dave Chaotic Neutral Join Date: Feb 2008 Location: Cherry Hill NJ Moto: GV1200 Madura, Hawk gt Posts: 13,992	i call ballast for the test ride __________________ TWF Post whore #6

08-18-2009, 02:15 AM	#15
derf token jewboy Join Date: Nov 2008 Moto: CBR 900, KLR ugly ass duckling, Gas Man Posts: 10,799	we shall see how I do in court in sept __________________

08-18-2009, 02:45 AM	#16
derf token jewboy Join Date: Nov 2008 Moto: CBR 900, KLR ugly ass duckling, Gas Man Posts: 10,799	And if this makes any sense to anyone other than me, this is how I would do the 3rd wheel assembly. Green is a car spindle (rwd car no driveshaft through it) Blue are ball joints(upper and lower) red are heim joints black is frame tube upper ball joint would be fixed against a load bearing hoop lower ball joint would be on a single A arm, adjustable for caster the front heim would be adjustable for toe The 3rd wheel would be based off of a mcphearson strut assembly, without the actual moving suspension (3rd wheel suspension has a habit of flipping the car mid corner). The structural hoop would replace the strut and be fixed. This design gives maximum adjustability while requiring the least amount of space from the passenger platform __________________

08-19-2009, 09:33 PM	#19
goof2 AMA Supersport Join Date: Feb 2009 Posts: 4,756	It looks like a good design. You have the adjustability you need while still keeping it simple. The thing I would be especially cautious of is where the sidecar structure was mounted to the rest of the motorcycle. Make sure all attachment points are solid with no flex (I'm primarily thinking the subframe). It would be a bit of a pain to hit a bump and have the geometry of the sidecar wheel change.