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Author Topic: Nostaligic build, 71ish Rupp Black Widow, now race build  (Read 5777 times)

Offline JSJamboree

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Well, I only had 3 bikes in my garage, and while painting my 100 this weekend I got a little nostalgic with an old 71 Rupp Blackwidow mini-bike I use to tear around on.  Its been sitting for about 10 years when I blew out a bearing and wouldn't start.  Decided to nab it from the parents house and bring it home for some tender love.  Going to see about getting this bad ass mini-bike back in the dirt.  Sorry if I offend anyone by having a build thread for this bike, but i figured since it had more CCs than my CB100 cafe bike that someone might get a kick out of it.  Hopefully I wont have as much into it as the CB100, but if thats what it takes.. so be it.




Offline Big Rich

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Re: Nostaligic build, 71ish Ruff Black Widow resto
« Reply #1 on: Oct 01, 2012, 00:59:31 »
Cool scoot Jordan! What size are those tires?

Offline joeyputt

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Re: Nostaligic build, 71ish Ruff Black Widow resto
« Reply #2 on: Oct 01, 2012, 12:19:26 »
Brother I think it is awesome that you are restoring your old mini bike and that you started a build thread for it, man I wish I had the old mini bike that me and my Brother used to have when we were children as I would love to restore it as well!
Joe - Owner/Operator of DWMS Racing World Class Engine & Motorcycle Building www.dwmsracing.com

Cylinder Head Porting Sale! http://www.dotheton.com/forum/index.php?topic=56203.msg637024#new

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Offline JustinLonghorn

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Re: Nostaligic build, 71ish Ruff Black Widow resto
« Reply #3 on: Oct 01, 2012, 15:19:12 »
Righteous.
I'm going to eat your brains and gain your knowledge.

Into The Sunset, CB750 build

TT500 the Animal

Offline JSJamboree

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Re: Nostaligic build, 71ish Rupp Black Widow resto
« Reply #4 on: Feb 14, 2013, 17:29:44 »
Well, been working on this guy for while.. Should have taken pics of the process but I didn't...

Anyways, after a bunch of research I found out the motor isn't what normally came on them, and I cant find any information about the B&S motor thats on it.  Cleaned out the carbs but wasn't able to find a rebuild kit so hopefully the seals etc hold up.  Got it all stripped down, cleaned it up and painted it, putt back together now.  Decided to replace as little as possible and not do a full resto but instead just get it running and 'nice'.

Here you can see the reason of its final death.  Was eating high speed bearings beacuse the shaft was so screwed up it was just bouncing around in them.



Here you can see the new one that was made for me to replace it



Here it is in its current state.. Dont plan to paint the wheels just going to leave them as I plan to get them dirty anyways in the mud.  Trying to bid on some shocks for it as I found out one of mine had about a 10dev bend where we had just stressed it to much and the other fell apart when I took it off.. so they were shot.  Table was a little messy








Offline Big Rich

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Re: Nostaligic build, 71ish Rupp Black Widow resto
« Reply #5 on: Feb 14, 2013, 21:53:43 »
Jordan, you said carbs (plural). Is there 2?

I have a couple smaller carbs around, any idea if you can retro-fit something?

Offline JSJamboree

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Nostaligic build, 71ish Rupp Black Widow resto
« Reply #6 on: Feb 14, 2013, 22:41:35 »
I think making things plural is a force of habit. There is a singular carb on this guy. I'm going to see how it works when I get it together, not sure about retrofitting with how it's setup (ill take a pic of this weird feat of engineering tomorrow and show you. I'm sure I could take a pic and call jackssmallengines and they could figure it out. Well see how it goes and cross that path if necessary.

Offline JSJamboree

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Re: Nostaligic build, 71ish Rupp Black Widow resto
« Reply #7 on: Feb 15, 2013, 15:16:12 »
Here is the carb thats on it.  there arnt any markings anywhere on it and I havent seen another like it on ebay or anything to find information.  Only know its on a B&S..  I found some kits that 'looked' like the seals on mine, but were always for 11hp motors.. this is 3.5hp.

Offline jeff4uk

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Re: Nostaligic build, 71ish Rupp Black Widow resto
« Reply #8 on: Feb 21, 2013, 08:57:09 »
The carb may also be fitted to lawn mowers (3.5 bhp) !!!!

Offline JSJamboree

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Re: Nostaligic build, 71ish Rupp Black Widow resto
« Reply #9 on: Sep 17, 2015, 10:20:59 »
So it's been awhile since I posted on this. Last I was working on it I got the frame all pretty and put it all together but couldn't get it running. I quickly lost interest and it went back in the barn.  The hoodcats have started getting into minibikes with Tifuns CT70 spurring us on so I decided to start back on this.

First I changed out the coil on the Briggs, cleaned out the carbs again, and made sure everything was straightened out with the motor and still nothing. Got tired of fucking with it and went to HF and bought a 6.5 hp predator motor.

First things first, gas tank, intake, and exhaust had to be removed to get it into the frame. No biggie. However that means I needed aftermarket exhaust, intake.  Ended up getting a intake, diy exhaust kit from NRRacing. Came with bigger jets. Also removed the governor, but everyone says the stock flywheel will Grenade, so a new billet flywheel was purchased.  Luckily, with a 1/4" spacer, the stock clutch setup works so I didn't have to worry about that.



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