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Old 09-23-2012, 10:29 PM   #1
Destructo
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Bumpin rubber uglies

So It begins another project as I wait for my carbs. I don't know if I should post this in here or if anyone cares but I thought I would document it for CCM or anyone else interested in making a bump starter for those serious race bikes with a total loss electrical system. Any way here is the beginning of it as I have all of the major parts and got the iron to make the frame, all I will need is the wheels.

212cc gas motor, 2 @ 1" bore pillow blocks, kart race slick and rim, 1" live keyed cart axel. 1" cart hub, 41 pitch chain, 5/8" drive sprockets, 1" final drive sprockets, collars, bicycle cable and brake lever for throttle.



The hub didnt fit the rim so I had a machinist buddy turn down the hub boss to fit the inside and drilled new holes for the hubs.





Here is what I'm going for.
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Carbs Officially 1.7RK CCMerated
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Old 09-23-2012, 10:57 PM   #2
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Re: Bumpin rubber uglies

This will be cool to see, post away!
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Old 09-23-2012, 11:33 PM   #3
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Re: Bumpin rubber uglies

Yay, something for ME!
I never get anything, just for others.
Will follow this eagerly, although it may be awhile before I get to try it on the srad race bike, as i first have to drop the motor on the new bike and go through it.
Will test on the CBR1KRR.
Awaiting your carbs in trade sir...
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Old 09-23-2012, 11:41 PM   #4
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Re: Bumpin rubber uglies

Yes sir was hoping I wasn't going to have any major carb problems so I could test it out on my bike. Might be able to get a friend to bring his bike over to test it before I ship out to make sure there are no problems. This is gonna be pretty cool, I like figuring out how to make stuff.
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Old 09-24-2012, 12:29 AM   #5
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Re: Bumpin rubber uglies

So I laid out the final drive, hub and block locations, got a baseline in and out for the final drive shaft from the motor and most importantly got the center to center for the frame. Tomorrow I can start on the frame and motor plate and figure out a way to have the pillow blocks adjustable like a swingarm to adjust the chain tension and make a chain guard. This is gonna be a lot more work than I originally thought but I think its gonna turn out tits.







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Carbs Officially 1.7RK CCMerated
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Old 09-24-2012, 12:53 AM   #6
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Re: Bumpin rubber uglies

Why not go with a centrifugal clutch on the motor for safety's sake or is there an internal clutch on that motor?
You could also use a swing arm for the drive wheel that may allow for the adjustments you seek while also prefabbing a major part of this whole project?
To take it a step further...you could use the original swing arm pivot as a jack shaft if need be?
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Old 09-24-2012, 01:03 AM   #7
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Re: Bumpin rubber uglies

Because I'm $400 deep into this not counting any of my time and we are trading, I probably would have been better off just paying for the carb job. A centrifugal clutch is another $100, which can be added at a later time if he would like. Thats why I'm going to make a chain guard and test it before I send it out and the thing is only going to operate for maybe 20 sec a pop ?
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Old 09-24-2012, 01:15 AM   #8
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Re: Bumpin rubber uglies

One of several under $40.00: http://www.ebay.com/itm/Comet-centri...item257364765e
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Old 09-24-2012, 01:26 AM   #9
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Re: Bumpin rubber uglies

1" shaft 41 chain 10 teeth http://www.gokartsupply.com/clutches.htm
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Old 09-24-2012, 01:33 AM   #10
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Re: Bumpin rubber uglies

The motors shaft is 1 inch?
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Old 09-24-2012, 01:48 AM   #11
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Re: Bumpin rubber uglies

Send Chris this:
Attached Images
File Type: jpg ham.jpg (5.4 KB, 253 views)
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Old 09-24-2012, 01:55 AM   #12
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Re: Bumpin rubber uglies

motor shaft is 5/8" you are correct sir but I can't find the diameter of a a 5/8" clutch to drive off of the motor like it should be so the clutch would hit the motor mount plate the way I have it drawn up. Plus the motor maxes out at 3500 rpm and the clutch only engages at 2300 rpm. I guess I should ask Chris how far he wants to go with this. A clutch would be preferred though as you are saying.
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Old 09-24-2012, 01:55 AM   #13
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Re: Bumpin rubber uglies

Quote:
Originally Posted by THE SRADIATOR View Post
Send Chris this:
Now that shit is funny
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Old 09-24-2012, 01:58 AM   #14
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Re: Bumpin rubber uglies

Aw screw it whats another $40 on a one off bump starter, I just wait to cut the motor mount until I get a clutch.
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Old 09-24-2012, 02:05 AM   #15
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Re: Bumpin rubber uglies

I was thinking...
Take an unbraced swing arm, weld a plate on top for the motor, mount it on pillow blocks via the pivot shaft, use the stock adjusters to keep the chain tight, make a screw type adjuster to raise/lower the rear and affix it all to a platform for a low cost, fairly simple bump starter.
You can work out the details but that basic configuration just came to mind.
I'm also wondering if a chain saw motor, with it's internal clutch & compact design, would be the ideal power plant?
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Old 09-24-2012, 02:11 AM   #16
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Re: Bumpin rubber uglies

I'm also wondering why you don't use that welding picture as your avatar as its ultra cool and ultra you!
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Old 09-24-2012, 02:15 AM   #17
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Re: Bumpin rubber uglies

Ya that ship has already sailed, haha. The motor and all the pillow blocks and sprockets and stuff ain't cheap though. I was gonna try to go cheapo and just get a shaft coupling and 1 pillow block and just mount the tire right off the shaft with a pillow block right next to the shaft to take the wobble and load out of it but decided not to.
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Old 09-24-2012, 02:16 AM   #18
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Re: Bumpin rubber uglies

Cause its bigger as a sig. Im a Union Ironworker so the avatar is me too.
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Old 09-24-2012, 02:17 AM   #19
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Re: Bumpin rubber uglies

Go drag bike and cut a hole in the sprocket cover and use a remote starter!
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Old 09-24-2012, 02:22 AM   #20
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Re: Bumpin rubber uglies

Well...No matter how I look at it, you got mad skills!
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