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| Motorized Bicycle General Discussion Topics on bicycle engine kits, help articles, repair and modifications for your motorized bicycles |
3 Piece Wide Crank??
Discussion at Motorized Bicycle Engine Kit Forum in the Motorized Bicycle General Discussion forum. Just bent mine ,works great,clears rope start 1/2 inch.watch your flame,take tank off and drain carb,...  | | 
09-12-2008, 01:58 AM
| | Motorized Bicycle Builder | | Join Date: Aug 2008
Posts: 44
| |  Re: 3 Piece Wide Crank??
Just bent mine ,works great,clears rope start 1/2 inch.watch your flame,take tank off and drain carb,dont want to call 911. HARLEYS DAD |
09-12-2008, 04:07 AM
| | Motorized Bicycle Builder | | Join Date: Jul 2008 Location: Ocean Shores, NSW
Posts: 27
| | Re: 3 Piece Wide Crank??
Quote:
Originally Posted by jimraysr  I am building a Honda / GruBee on a new Schwinn Searcher. It has enough frame space for the engine and mount, BUT the crank bearings are around 1 1/2" and I don't think the one piece crank in the kit will go in the bearing case.
I have seen wide 3 piece cranks pictured in other kits, but have not found them available as a separate item.
Has anyone had any luck in finding a wide 3 piece crank?
Thanks, Jim
| Jim, I think the 1 piece will work but you may need different bearings for it. The 1 piece fits the other Schwinn Cruisers without changing the bearings.
The 3 piece is a mongrel of a crank and it's only practical use is as a weight for deep sea fishing. I have 2 lying around here. |
09-12-2008, 07:34 AM
|  | Master Motorized Bicycle Builder | | Join Date: Mar 2008 Location: Cropwell Alabama
Posts: 144
| | Re: 3 Piece Wide Crank??
Quote:
Originally Posted by DOC BOLM Just bent mine ,works great,clears rope start 1/2 inch.watch your flame,take tank off and drain carb,dont want to call 911. HARLEYS DAD | Hey DOC, some pics of this mod would be a great help if you can. I'm considering doing the same thing.  |
09-12-2008, 09:41 AM
|  | Master Motorized Bicycle Builder | | Join Date: Apr 2008 Location: Valparaiso, IN
Posts: 198
| | Re: 3 Piece Wide Crank??
I used short crank arms, but likely that will only work well if you do not plan on pedaling much. I built my bike to mimic an early motorcycle and to cruise on motor power- exercise is found elsewhere.
With the short crank, the arms do not reach the engine and are below it. The arms clear the rear bolts on the Grubee mounting plate by 1/4" on each side even using a standard bolt (though 7mm, not the stock 6mm), a washer and an 18 ga metal plate to pretty up the plate. |
09-12-2008, 12:40 PM
| | Motorized Bicycle Builder | | Join Date: Apr 2008 Location: Glendale, AZ
Posts: 33
| | Re: 3 Piece Wide Crank??
The offset cranks I got from Spooky Tooth were the same length as the original Schwinn crank arms (6" +). They fit the spindle just fine.
The problem with the one piece and a 1 1/2" bottom bracket looks to be the elbow won't fit through the small space?
Jim Quote:
Originally Posted by HoughMade I used short crank arms, but likely that will only work well if you do not plan on pedaling much. I built my bike to mimic an early motorcycle and to cruise on motor power- exercise is found elsewhere.
With the short crank, the arms do not reach the engine and are below it. The arms clear the rear bolts on the Grubee mounting plate by 1/4" on each side even using a standard bolt (though 7mm, not the stock 6mm), a washer and an 18 ga metal plate to pretty up the plate. |
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Easy does it, but do it! |
09-13-2008, 06:12 PM
| | Master Motorized Bicycle Builder | | Join Date: Mar 2008 Location: Cropwell Alabama
Posts: 144
| | Re: 3 Piece Wide Crank??
Quote:
Originally Posted by DOC BOLM Just bent mine ,works great,clears rope start 1/2 inch.watch your flame,take tank off and drain carb,dont want to call 911. HARLEYS DAD | Hey Doc, Here are the pic's you wanted me to post. Thanks again for your help.  |
09-13-2008, 10:15 PM
| | Motorized Bicycle Builder | | Join Date: Aug 2008
Posts: 44
| | Re: 3 Piece Wide Crank??
The left pedal is now 3/4 inch shorter than the right. If you think it will be a problem go to ebay #110288044785 pedal risers, and use only if needed.HARLEYS DAD p.s the brown lab in photos is harley |
09-14-2008, 07:57 AM
| | Master Motorized Bicycle Builder | | Join Date: Mar 2008 Location: Cropwell Alabama
Posts: 144
| | Re: 3 Piece Wide Crank??
Quote:
Originally Posted by DOC BOLM The left pedal is now 3/4 inch shorter than the right. If you think it will be a problem go to ebay #110288044785 pedal risers, and use only if needed.HARLEYS DAD p.s the brown lab in photos is harley | How about bending the other side to match??? Just an idea....  |
09-14-2008, 11:54 AM
| | Motorized Bicycle Builder | | Join Date: Apr 2008 Location: Glendale, AZ
Posts: 33
| | Re: 3 Piece Wide Crank??
Both my straight (Schwinn OEM) and offset China 3 piece cranks are 6" plus center to center. (center of spindle to center of peddle)
Is this the length of your cranks before you offset the one?
Jim
Quote:
Originally Posted by DOC BOLM The left pedal is now 3/4 inch shorter than the right. If you think it will be a problem go to ebay #110288044785 pedal risers, and use only if needed.HARLEYS DAD p.s the brown lab in photos is harley |
__________________
Easy does it, but do it! |
09-14-2008, 12:02 PM
| | Motorized Bicycle Builder | | Join Date: Aug 2008
Posts: 44
| | Re: 3 Piece Wide Crank??
Just put tape on it ,6 1/2 "give or take 1/16". if i ever have to remove it i will have to cut and replace crank. | | Thread Tools | | | | Display Modes |  Linear Mode | 
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