1972 Yamaha R5 Rat Bike The Yamabomination

theholybull

Active Member
Here is my 72 yammy R5 I found in an old ladys garage, I got it for all of nothing. Its a rat project with a budget of $250. As she sits now there is $55 spent so far. $45 for new coils and 10 for steel to make it rigid. I havnt had it running yet but she should be all right. I cleaned and rebuilt the carbs and have spark on 1 side. I hope i just have a dirty set of points or a bad condenser. It will look pretty much like it does in the final picture when its done. I may rattle can the the frame black or I may just let it rust. Im keeping the tank the way it is and i just love the denim seat. The wheel base is stretched 6" and the bike is lowered 2. This bike is for fun my cafe is gonna be pretty.
I hope you like her.

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theholybull

Active Member
Re: 72 R5 bobber work in progress

got my rear fender today, its another freebie. Its off an ol harley. I will get her mounted tomorrow. Sorry for the shitty ipod pics. Ill get some good ones tomorrow once I get the fender mounted.
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diesel450

"Fast with a past"
DTT BOTM WINNER
Re: 72 R5 bobber work in progress

Two stroke bobber, I fucking love it!!! You sir, have balls of titanium. You will probably kill yourself on this machine so I think it proper that we start a memorial thread to you now.

I will be following this closely!

I have nothing against you choppin' that but you realize that bike was worth $1K when you started??

I still love this, I fuckin' love it!!
 

diesel450

"Fast with a past"
DTT BOTM WINNER
Re: 72 R5 bobber work in progress

The best way I can describe this is that as a songwriter once in a while you come across a song that makes you think, "thats fucking brilliant, why didn't I think of that?"
 

theholybull

Active Member
Re: 72 R5 bobber work in progress

thanks for the positive feed back guys. I got the fender mounted, Im really suprised at how well this bike is coming together. Its got me wanting to make it nice instead of leaving her a multicolored rat. Tomorrow im going to tackle the air cleaner and air inlet tube. Ive got some good ideas that i think you will like. Anyway on to the pics.

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I need to get a wider rear tire but aside from that I dig it. Wadda ya think?
 

JRK5892

Over 1,000 Posts
Re: 72 R5 bobber work in progress (all hail the 2 stroke bobber!!)

what are you going to do with the front fender? that looks trick so far
 

diesel450

"Fast with a past"
DTT BOTM WINNER
Re: 72 R5 bobber work in progress (all hail the 2 stroke bobber!!)

If you're going to change the color, find a ratty R5 tank, that tank you have in that shape is pretty sought after.
 

theholybull

Active Member
Re: 72 R5 bobber work in progress (all hail the 2 stroke bobber!!)

diesel450 said:
If you're going to change the color, find a ratty R5 tank, that tank you have in that shape is pretty sought after.

The top of the tank has 4 dents on that top that dont show up in the pictures. it looks like someone stood on it in the past. If i do re paint it i will repaint it just as it is and make the rear fender match. I like the look of the tank so much in fact im going to duplicate it on my 74 rd350 cafe. It may sadden you to know that i stretched an rd tank nicer than this one.

As for the bike being worth 1k before i cut it up, the way I figure it is its still cheaper and a hell of more bad ass than my Sportster. If I really wanted to I could pick up an RD frame for next to nothing and put her back together. Im looking for 2 more R5s or 350s I want a tracker and a stocker. That way all of my bases are covered.
 

theholybull

Active Member
Re: 72 R5 bobber work in progress (all hail the 2 stroke bobber!!)

I actually read through your build a couple weeks ago. Im thinking something like this for my street tracker
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diesel450

"Fast with a past"
DTT BOTM WINNER
Re: 72 R5 bobber work in progress (all hail the 2 stroke bobber!!)

Classic and beautiful. I'm rethinking my rear hoop. maybe shortening it a bit.
 

theholybull

Active Member
Re: 72 R5 bobber work in progress (all hail the 2 stroke bobber!!)

I thought about going the way you did on your bike for the rear of the seat, but the way I ride my cafe I need the rear of the seat to support my ass on that full throttle 1-2 and 2-3 shift. These guys with their 4 strokes will never understand the thrill of a super lightweight 2 stroke. I think if your bike were mine I would bend up a small rear hoop and put a 2" or so back rest, sorry but stopper to keep you on there when the wheelies happen.
 

theholybull

Active Member
Re: 72 R5 bobber Mockup Is Finished

Mock up is FINISHED This is pretty muck how it will look when its done. The frame is going to get welded and a coat of paint and the inlet tube also needs welded up but aside from that my rat is done, I think I may actually decide to give her a flat black paint job and some header wrap for a finishing touch. I'm kinda torn on that right now. It may be best to get her running first.
ant way heres my new intake

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The battery box and electronics boxes, These are project boxes from Radio Shack. $10 for the pair.
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All mocked up and ready for tear down and welding
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Sorry about the ipod pics, I cant find my camera. Ill try to get better ones up later tonight.
 

Swapmeet Louie

Put some metal in yer eye....
Re: 72 R5 bobber Mockup Is Finished

Are you going to build a proper rear triangle? Everything else is cool. But I think that half-stepped hard tail will keep your bike from ever getting any real respect, and may bury all your other neat mods.

Check out the Dirt Nap...
 

JRK5892

Over 1,000 Posts
Re: 72 R5 bobber Mockup Is Finished

uh man tuning that bike is going to be a nightmare i would imagine... i hope not cause that snorkle looks insane!!!
 

theholybull

Active Member
Re: 72 R5 bobber Mockup Is Finished

JRK5892 said:
uh man tuning that bike is going to be a nightmare i would imagine... i hope not cause that snorkle looks insane!!!

I have a feeling its going to be a bitch to get the jetting right, I think that I may be able to get it. The mainfold that runs to the carbs is pretty symmetrical and smooth. We'll see.
Swapmeet Louie said:
Are you going to built a proper rear triangle? Everything else is cool. But I think that half-stepped hard tail will keep your bike from ever getting any real respect, and may bury all your other neat mods.

Check out the Dirt Nap...

The plan was to do a full rear triangle but the way the frame is under the engine it would be a real pain in the ass and its just not worth the effort. If i decide to do a full triangle I just have to cut off the swing arm, and weld the bottom tubes to the wheel plates on the swing arm and remove the swing arm bolt, after of course i completely rebuild the frame. I agree it looks much better but you know what?

Fuck it, Its a rat.
 

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