Eight Pounds and 40 Stone Build

[bonneblktrk]

Got the forks and swingarm tonight. Just got home from work, had a look at them, like it. Will post pic. tomorrow.
Good info about the blower. Thanks.

[bonneblktrk]

What have I done now! The fork swap doesn't look too complicated. The frame I have has roller bearing in the neck and the Busa tree uses ball bearings but I have another frame that used ball berings, otherwise the heights of the stems look close.

The more complicated swap will be the swingarm. Just started some mock-up and measurements. Initially will need pivots and pivot mounts made, drive shaft spline adapted, shock mount. Who knows what else will crop up. Got a really good price on it complete $150. Love the look!

Couple of questions:

The forks are about 3 inchs shorter, which will change the rake and trail, how much not known.

Swing arm is over 6 inches longer! Talking drag bike or what! Fitting pivot mounts and adapting driveshaft may even require locating pivots even further aft.

Anything can be made to fit, BUT!

[CYBORG]

that looks like a fun project

[Ridge Runner]

Watching this one.

[bonneblktrk]

Thanks, the pressure is on lol.

My son entered it in the Custom Fighters forum 2013 build off. You can see last year's build behind the swingarm in above pic. I'm not good with timetables.

[shupnfish]

I'm really digging that swingarm look! Very interested to see how it comes out. I've always liked the single sided swingarm. Keep the pics coming.

[bonneblktrk]

Received the swingarm shock today. It's a Hayabusa shock also. Looking at parts drawings it appears the GL and Busa have same type of linkages. The busa dogbones go to the rear attaching to singarm. while GL goes to the front and ties to the frame. I think it will work.

Also drove out the upper and lower neck bearing races. Going to go to bearing supplier Monday to try to find something that will work, want to retain the busa stem if possible.

[Red2trike]

Man, that's a lot of swingarm! I might suggest cutting a piece out of that arm...somewhere on the flat. Maybe take 2 3/4" to 3" out and this just might be a lot better to deal with for overall length and swing length and handling. Might make it "l@@k" near stock length. Just gonna be difficult to widen the lower part of the frame and still keep it "stiff/rigrid". The removable lower frame member might have to be modified or taken out all together. Not sure if running the new swingarm outside the old frame is a better way or not to attach swingarm. Mmm, hope your not running a 300 series tire!!! Just tossin' out some thoughts.

Mmm, the ground clerance of 5.9" is a pretty standard measurement on the Wings. I think it's from the bottom of the motor as it sits in the frame. But I could be wrong.

Blower stuff: 5-6 pounds of pressure (roots or centrifical) is about the normal for street apps. Ya can go a bit more like 6-10 BUT ya gotta be a lot more careful. Unless you can get the head or block o-ringed or add a few more cylinder head bolts going with higher pressure it's just wasting money/time. Adding a little alcohol/water squirt (injection) somewhere in the rpm band helps with cooling and power...just to mess with your head.

Have to get my popcornm ready now to watch this build.

RT2

[bonneblktrk]

RT2 Thanks for the insiteful comments. You've spent some time considering it.

Had considered narrowing it to fit inside the frame. Rather dangerous to get pivot to be lined up during tacking and welding it back. I wonder if the casting is hollow. Shortening it is a good idea but I think it would have to be forward of the notch for the tire. Not fitting a 300 probably same size as orginal to keep final drive ratios close. Would also require shortening the driveshaft which might be good anyhow because spline end at universal protrudes further than organial shaft so will have to be shortened anyhow to adapt the splines between old and new.

IF I am not concerned with length, which I am, could make some steel blocks with the pivot welded on rear of frame where the battery box and rear brake reservior are, then frame would not be disturbed as much.

How will the longer wheel base effect handling? I'm not certain.

Should have done more research on the swingarm, like measure one first! But the concept is so cool for the SSSA on the old Goldwing.

[wingrider]

Just an FYI for ya...if you wanted to put new bearings in, All Balls has a conversion on their site for running different forks on different bikes.

I am also putting a Busa front end on my supercharger project, and just received the bearings for the conversion. Kind of funny, I also considered putting an 1800 rear end on my 77, but certainly seemed to be a fair bit of work to add to the rest of the work I have ahead of me.

Best of luck on your project!

[Kriss]

Although after removing cs bracket may want to reinforce the that cross tube.

If you do replace the cross tube do not cut through it on the sub frame side cut around it,the foot rest hanger is a bolt
and the head is welded in side the tube, cut through it and you cut the head and weld off. Good luke with the biuld.

[bonneblktrk]

kriss, I was going to leave the cross tube intact just remove the cs bracket from it, should I still reinforce the cross tube?

wingrider, I was looking online for bearings and really couldn't find the top one with it's OD 47mm. Was going to local bearing supplier, but my son also knew of All Balls on a swap he did last year, and sure nuff he straightened out the old man. Is your Busa stem long enough, mine is close but won't know till get bearings, heard you can cut/splice/weld stem to get length. Ya the swingarm is still in beginning planning stage, thought I would get the fork conversion out of the way to see some progress.

[wingrider]

From what I can see, it isn't quite long enough...going to have to chop the steering head slightly to get the nut to catch. KMR had a detailed write up, with links to a total of three Busa fork installs. You can find it here: http://www.ngwclub.com/forum/viewtopic.php?f=16&t=30973

[bonneblktrk]

Ya I thought could trim off about 1/8" off of bottom of neck tube where bearing race could seat up a little higher.

Cyborg told me about KMR write up, been wading through 56 pages of it, I'll look at your directions. Thanks guys.

[BusaRider]

You question about wheelbase affecting handling. My busa has a stock length swing arm. A friend had a turboed out busa with a longer swing arm, it's been a few years but I think it was 8" of stretch. Knowing this was done for drag racing, I expected the bike to handle poorly. It handled pretty close to my basically stock bike. In the twisties is took quite a bit more input. I also noticed it needed more turn in slow speed (steering instead of countersteering )turns if that makes any sense...