Miatav8,MstrASE,A&P,F wrote:
I like it. I'm suprised you didn't reuse the Yamaha fuel tank too. It looks like it may have fit behind the dash.
I guess this is gravity feed. Do you have another way to shut off the fuel flow?
Hope you don't mind me answering in detail with pics
the stock tank is actually too long to fit in the fwd cowl, and I need that room for electrics and the glove box, etc. I did mock the tank up over the rear wheel a few times (see pics) but the amount of work I've had to have done to make that installation work(and keep the rear cowl height I wanted) was excessive, and I wanted more that the 4.0 gallons of the stock XS850 Special tank capacity, so I ditched it in favor of the 6.5 gal polypropelene Speedway motors tank seen in the pics upthread, and a few below.
Though the tank is nominally higher than the carbs on the engine, the fact that the fuel line travels down to the floor, along the length of the passenger compartment and then back up to the carbs made me feel a pumped system was appropos. the fuel system goes from the Speedway tank, down to a suzuki VS 1400 fuel pump that's going to be operated by a fused dashboard switch. there will also be a standard motorcycle style fuel shutoff beneath the tank.
The fuel tank installation occured between 11/22/11 ans 12/21/11. Tank mocked up for positioning
Fabricating the tank mounts from 1.5 x .125 mild steel angle. I've gotten into this thing of boring 3/4 inch "lightening" holes into bracketry. adds a nice visual detail, doesn't really do much for weight. the mounts are cut and tapered to meet the middle top bar on the rear passenger frame, and the vertical flanges were notched for the round tube they're sitting on. there are also stiffener supports welded between the horizontal tank mount surface and the tubes.
mocked up with welding magnets
simple 2-bar welding fixture...
fuel tank and fuel pump installed
Quote:
I have a silverwing scooter and am also working on a trike, or will be once my barn is complete. Should be a couple more months now.
kewl, the silverwing is a nice machine. they're rarer even than burgman 650s
Quote:
I assume there is only one ujoint on the bike stock. Did you add another and just connect the two?
well, yeah, kinda. there are two Suzuki VS800 Ujoints, and one XS850 ujoint. the B-3 has a two piece driveshaft: a rear driveshaft under the seats that rides in race-kart axle bearings, and a fwd driveshaft (I call it the "intermediate driveshaft") that connects from the XS850 output flange to the fwd end of the rear driveshaft.
the rear driveshaft is a piece of 1.0 OD .188 wall DOM, with the spline ends from two Suzuki Intruder VS800 driveshafts cut, machined to fit, and welded into the tube. don't worrry, I didn't use my little 135 amp 120 volt welder for that. A buddy of mine owns an automotive shop with a nice miller 240 volt welder that I used. I also did significant weld prep, i.e.bevelling.
prepped, and welded, spline end.
to fit into the kart axle bearings, I had to have the rear driveshaft weldment machined on both ends to .995 OD. This pic shows the back end of the rear driveshaft which supports the free end of the vs1400 driveshaft inside the swingarm.
the intermediate driveshaft rides free between the fwd end of the rear driveshaft, and the XS850 output flange. same construction methodology, minus the finish machining. main difference is that the fwd spline end has an XS850 driveshaft spline end (cut and machined) welded in.
Quote:
I'd like to see and hear a video.
I have a bunch of video on my youtube page, the address is at the end of my opening post. of course, it usually winds up being a month+ out of date since actual building is the priority
Quote:
Another guess is the speedo is cable driven off the bike's front wheel. Maybe gut the speedo to swap the internals for an aftermarket adjustable unit and it's own sensor off the driveshaft flange.
I have a concept on mind that uses a couple pulleys and a toothed belt driven from the intermediate driveshaft (somewhere), to drive the motorcycle speedo drive, but I've been looking at the various aftermarket electronic speedos (sunpro has a nice one for about $100) and making a pulse wheel to mount to the driveshaft ( since most of the aftermarket units like 8 pulses per revolution) might be where I wind up. and then I'd get riod of that stupid early 80s 85 mph speedo...I'd have to rewire a couple indicator lites but, eh.
Quote:
Plan to can the exhaust pipe for a heater? Just a wrap around the pipe with a 1" greater od tube, open at the front, elbow at the back to the inside with a butterfly valve.
heh. I saw the "A&P" in your handle
yep I've thought about a homebuilt aircraft style heat muff. I am motivated to make this a year-round vehicle, so interior heat will likely hqppen at some point. I was an EAA member for about 10 years from 1984, got plans for an Acrosport 2, a KR1, a Greiga Aircamper, and a Hovey Deltabird ultralight. I have boxes and boxes of Sport Aviation magazine.. want some?
Quote:
Looks like you could sit a few inches lower too, bringing the cowl down with it for a very slick shape when skinned.
welll, ummm. the rear driveshaft - due to the motorcycle engine/swingarm offset towards the driver's side - is right under my right hipjoint, within 1.2 inches when the seat is in place. the seats are about as low as they can go. the engine is actually offset .75 inch to the passenger side to get a little more footwell space for the driver (and clear the steering shaft, but that's another story with pics ...
)
Robb
Login
Register
FAQ
Members
