Old Brown 2019

1974 TXA650

Old Brown

Old old brown page

Old Brown Rebuild

Old Brown Build History

 

I bought Old Brown in 1975. The previous owner had added a Hooker Header 2 into one exhaust and laced up a 5.10 x 16 bobber back tire. From what I remember he traded her in for a XS750.

 

The Hooker Header loved to launch it’s baffle when the screw to hold it in rattled off. Rode it on Houston Freeways and it had plenty of power.

I added a 32 tooth rear sprocket to ease the revs on 70’s Houston Freeways at speed.  A  Dunlop TT100 tire on the front and a fresh 5:10 x16 on the rear did a lot for the handling along with more preload on the front fork springs with a longer pipe under the fork caps. Stock, the bike ran well with the aftermarket pipe and stock 38 vacuum carbs and would blast from 45-90 mph.

Rode it through Jimmy Carter’s fake gas shortage. My allowed 8 Gallons in my car pumped into the bike went a lot further down the road.

After a lot of hot Houston miles she started to smoke. Some time in 1977 I had killed enough Houston mosquitoes fogging the roads.

Rode it to The House of Wheels and had the top end rebuilt.  like all my buddies.

 

Wiesco 750 Kit

Stock Cam, BS38mm stock carbs , foam pod air filters , Hooker Header.

Added second disk in front,

15 % displacement + higher Compression ratio

Bike was much quicker. Good mid range torque and a great charge to red line.

Rides with my buddies on other 650’s found me getting better mileage on $.69 gas. Passing on two lane roads was effortless. Just twist and hold on.

 

Ran great on pump premium.

One of my 650 bud’s had caught the road racing bug and somehow  talked me into taking OLD Brown to Texas World Speedway.

I ran around Texas World with stock fenders ,seat battery box, headlight and taillight . Even more interesting at Oak Hill. Discovered in riders school that my XS650 would pull away from a Triumph 650 on the straights

 

 

 


 

 

 

Then IS Now

 

 








TX-A 650

38mm Forks from mid 80’s XJ700

XJ Triple Tree

XS Lower Bearing

XJ Upper Bearing

XJ Front Wheel

XJ Dual Disk Twin Piston Alloy Brakes

XJ Front Fender

XS-E Rear Swing Arm

Disk Brake

Wheel

Fuel Tank

 

Exhaust

The guys making Kenny Roberts fast said to use 1.5 pipes 32 inches long. My buddy Ted had a bike with open pipes built to that spec. That bike sounded awesome around TWS. I noticed that Yamaha shortened the stock headers to 32 inches in 1974.

The Hooker Header and its descendants work very well with out being earsplitting

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Engine

700 CC Piston Kit bored out stock barrels Auto Machine Shop Job

38MM VM Carbs

Stock Cam

Buba HEI System Dodge hall effect GM Module

Cleaned Up Ports

Barnet Clutch and Springs

ront rear @8000
sprocket sprocket mph RPM @ 60 RPM @ 80 RPM @ 100 RPM @ 120
17 34 2.00 120 4000 5333 6667 8000 1.00
17 36 2.12 113 4235 5647 7059 8471 1.06
17 38 2.24 107 4471 5961 7451 8941 1.12
17 40 2.35 102 4706 6275 7843 9412 1.18
17 32 1.88 128 3765 5020 6275 7529 .94
17 30 1.76 136 3529 4706 5882 7059 .88
17 28 1.65 146 3294 4392 5490 6588 .82
17 26 1.53 157 3059 4078 5098 6118 .76
18 34 1.89 127 3778 5037 6296 7556 .94
18 32 1.78 135 3556 4741 5926 7111 .89
18 30 1.67 144 3333 4444 5556 6667 .83

 

 

 

 

Chopper wiring harness TC Bros Choppers (#19-0411)