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Author Topic: Ian's TX/CBR500A Yamahonda whatever  (Read 12311 times)

Offline Jewbacca

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  • Therapy is expensive. Riding is cheap. You decide.
Ian's TX/CBR500A Yamahonda whatever
« on: Jul 08, 2015, 02:03:54 »
So, long story short. I've been waiting 2 years now to get another bike. This past weekend, the wife asked me if I'd seen anything on CL that piqued my interest. After looking at a few projects here and there, I zeroed in on this little TX500 that a guy wanted to get rid of for a very nice price, and the most important thing, it had a title. So we made the trek down to Auburn, WA. It should have taken about 2 1/2 hours, turned into 6 because people forget how to drive on July 4th weekend and back traffic up for 8 miles for absolutely no reason. But I digress... Brought it home on Sunday night and immediately tore into it. By that night, I was 3 engine bolts from pulling the motor.

Fast forward to Monday night. Engine came out without too much fuss. Definitely a lot lighter than my Cb750. I set it aside for a few and took a crack at the framework. Harness, headlight, controls, battery box, signals, fenders... All came off. Harness is shot :/ along with all the regulators, coils, rectifier, condenser, etc. Both forks need to be rebuilt. Shocks aren't bad, just need a good sandblasting and cleaning. Tank is pretty bad inside, haven't decided yet what I'm gonna do about that. Seat is trash, so is the pan. No big loss there. Brakes are in need of complete replacing on the front, rear is yet to be determined.

Tore into it today. Little farther in. Met with some bad news. One of the intake lobes has some fairly noticeable scoring on it. Not what I wanted to see. New (used) cams are 25$ on Epay. Not to mention the starter chain and balancer chain are a bit loose for my tastes.

So here's where were at right now. Externals of the engine are torn apart. Frame is basically just a roller. Harness, and most every electrical component, needs complete replacing. Forks need rebuilding. Engine is gonna need some love. Right now I'm just starting to make a list of the parts, and prices, for everything and contemplating what direction I want to go.
« Last Edit: Oct 05, 2015, 00:18:18 by Jewbacca »
1979 Honda CB750K- Soon to be CB750K-SC Night-Ninja (SOLD)
http://www.dotheton.com/forum/index.php?topic=18771.0
1974 TX500A "Yamahonda" http://www.dotheton.com/forum/index.php?topic=66736.0"
1983 Honda CB650SC
http://www.dotheton.com/forum/index.php?topic=70532.new#new
Gives me a major cramp in my wedding tackle..." Fellow PNW Rocker Dave Simmons

Offline Jewbacca

  • Posts: 1153
  • Therapy is expensive. Riding is cheap. You decide.
Re: Ian's Bastard child TX500 build
« Reply #1 on: Jul 13, 2015, 00:27:06 »
So got some more time in the garage today. Down to the frame now. Wheels, brakes, forks, triples... all off the frame. Basically ran into more of the same crap. Everything on this bike is just corroded and thrashed. However, it's gonna be a long process. I've already relegated that this isn't gonna be done this year. At least I have something to keep me occupied for the winter. On to the pics:

1979 Honda CB750K- Soon to be CB750K-SC Night-Ninja (SOLD)
http://www.dotheton.com/forum/index.php?topic=18771.0
1974 TX500A "Yamahonda" http://www.dotheton.com/forum/index.php?topic=66736.0"
1983 Honda CB650SC
http://www.dotheton.com/forum/index.php?topic=70532.new#new
Gives me a major cramp in my wedding tackle..." Fellow PNW Rocker Dave Simmons

Offline irk miller

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Re: Ian's Bastard child TX500 build
« Reply #2 on: Jul 13, 2015, 02:20:46 »
Pretty.  I know you'll keep those handlebars.  They're pure sex.

Offline Jewbacca

  • Posts: 1153
  • Therapy is expensive. Riding is cheap. You decide.
Re: Ian's Bastard child TX500 build
« Reply #3 on: Jul 13, 2015, 02:35:12 »
They were secretly the main reason I bought it :/

Newest development:


The scoring isn't very deep, but it's there and can be felt with a fingernail. Used cams on ePay go for 12$-25$ each, NOS cams run $150+. I'm just a bit upset. We'll have to see how the budget goes the rest of the month to figure out if I'm getting used cams reground or just getting used cams. :/
1979 Honda CB750K- Soon to be CB750K-SC Night-Ninja (SOLD)
http://www.dotheton.com/forum/index.php?topic=18771.0
1974 TX500A "Yamahonda" http://www.dotheton.com/forum/index.php?topic=66736.0"
1983 Honda CB650SC
http://www.dotheton.com/forum/index.php?topic=70532.new#new
Gives me a major cramp in my wedding tackle..." Fellow PNW Rocker Dave Simmons

Offline irk miller

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Re: Ian's Bastard child TX500 build
« Reply #4 on: Jul 13, 2015, 02:45:50 »
That blows.  IIRC, you're looking at $80 for so for a regrind anyway.  New isn't much bigger of an investment if you have to buy used ones and have them ground.  Do they make a high performance cam for that motor?  Maybe there can be an opportunity here.

Offline Jewbacca

  • Posts: 1153
  • Therapy is expensive. Riding is cheap. You decide.
Re: Ian's Bastard child TX500 build
« Reply #5 on: Jul 13, 2015, 02:51:52 »
You know, I already emailed a company up here about regrinding the cams hotter but have yet to get a reply. I haven't found any aftermarket cams, or even grind specs, but I do know they make high comp pistons that raise it to 9.5:1. Stock is only 8.6:1. Doesn't exactly scream high performance.
1979 Honda CB750K- Soon to be CB750K-SC Night-Ninja (SOLD)
http://www.dotheton.com/forum/index.php?topic=18771.0
1974 TX500A "Yamahonda" http://www.dotheton.com/forum/index.php?topic=66736.0"
1983 Honda CB650SC
http://www.dotheton.com/forum/index.php?topic=70532.new#new
Gives me a major cramp in my wedding tackle..." Fellow PNW Rocker Dave Simmons

Offline jimmer

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Re: Ian's Bastard child TX500 build
« Reply #6 on: Jul 14, 2015, 01:03:52 »
Late model stock'78 pistons are 9.6/1 comp. and Webcam will grind you some cams for about $300 a set. But don't bother unless you have carbs,exhaust,ignition to go with it.
Yamaha Blaster Bike                                                                  Suzuki T500 Titan Twingle

Offline Jewbacca

  • Posts: 1153
  • Therapy is expensive. Riding is cheap. You decide.
Re: Ian's Bastard child TX500 build
« Reply #7 on: Jul 14, 2015, 20:59:57 »
Yeah. I just got quoted 400 for a mild performance cam job. I think it's gonna stay stock for now until I get it running and get some miles on it. I just wanna ride.
1979 Honda CB750K- Soon to be CB750K-SC Night-Ninja (SOLD)
http://www.dotheton.com/forum/index.php?topic=18771.0
1974 TX500A "Yamahonda" http://www.dotheton.com/forum/index.php?topic=66736.0"
1983 Honda CB650SC
http://www.dotheton.com/forum/index.php?topic=70532.new#new
Gives me a major cramp in my wedding tackle..." Fellow PNW Rocker Dave Simmons

Offline jimmer

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Re: Ian's Bastard child TX500 build
« Reply #8 on: Jul 15, 2015, 00:48:52 »
Good choice,just ride.
Yamaha Blaster Bike                                                                  Suzuki T500 Titan Twingle

Offline Jewbacca

  • Posts: 1153
  • Therapy is expensive. Riding is cheap. You decide.
Re: Ian's Bastard child TX500 build
« Reply #9 on: Jul 15, 2015, 01:14:57 »
Granted it's gonna take a lot of work to get it back to riding status, but 3-400 on a set of cams, and the subsequent $$ for upgrading the carbs, exhaust, ignition, suspension, etc is just beyond the budget for this bike. Body wise I'm not limited by anything as I have a full machine shop of metal and tools at my disposal (along with making my own other pieces that are impossible to find). I'm trying to keep this one on track and on budget. If I wanted something with 100hp, I'd have bought an R6 haha!
1979 Honda CB750K- Soon to be CB750K-SC Night-Ninja (SOLD)
http://www.dotheton.com/forum/index.php?topic=18771.0
1974 TX500A "Yamahonda" http://www.dotheton.com/forum/index.php?topic=66736.0"
1983 Honda CB650SC
http://www.dotheton.com/forum/index.php?topic=70532.new#new
Gives me a major cramp in my wedding tackle..." Fellow PNW Rocker Dave Simmons