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| 4 Stroke Bicycle Engines & Kits 4 stroke motorized bicycle engine kits are great if you want reliability or do not want to mix your oil and gas. Learn from each other how to get the most out of your 4 stroke bicycle engine |
3 speed jack shaft
Discussion at Motorized Bicycle Engine Kit Forum in the 4 Stroke Bicycle Engines & Kits forum. Jeebus, I've never seen the guts of a 3 speed hub before and now I know why!
That thing ...  | | 
09-27-2009, 06:17 PM
|  | Moderator | | Join Date: Jul 2009 Location: Maine
Posts: 1,197
| |  Re: 3 speed jack shaft
Jeebus, I've never seen the guts of a 3 speed hub before and now I know why!
That thing has more bits in it than the chinagirls do lol |
09-27-2009, 06:53 PM
|  | Motorized Bicycle Elite Member | | Join Date: May 2009 Location: acme labs
Posts: 176
| | Re: 3 speed jack shaft
don't know the exact ratios of the hub but 1st is an under drive, 2nd is a 1-1 ratio and 3rd is an over drive, i fired it up on the stand today and ran it through the gears, it's pretty freakin cool to watch it change speeds. going to do a road test soon, went to put my new tires on and they wouldn't fit my rims, using 26x2.125 tires but these old columbia rims take a tire for a V-7 rim what ever that is, going to the bike shop on monday to find out and get a set.
the whole point of the hub was that the 3-1 reduction on the gear box's isn't enough for a nice riding bike, i'm using the honda GX35 motor, it's a kick as* motor, fires up on first pull and hardley makes a sound. the chains turning make more noise than the engine, no vibration either. i think everyone is going to like this bike, it's getting a streached tank and full skirted indian style finders, gun blued frame and silver paint, with springer front end and drum brake dyno hub. |
09-27-2009, 07:00 PM
|  | Motorized Bicycle Newbie | | Join Date: Sep 2009 Location: Martha's Vineyard
Posts: 1
| | Re: 3 speed jack shaft
Looks great man. Will be watching to see what kind of results you get. |
09-27-2009, 08:15 PM
|  | Motorized Bicycle Elite Member | | Join Date: May 2008 Location: CT, U.S.
Posts: 2,615
| | Re: 3 speed jack shaft
Big time, me 2
__________________ Quote:
Originally Posted by NEAT TIMES  looking In The Sky, May See Dan Flying By!! Ha Ha Ron | I want 2 ride my bicycle |
09-27-2009, 08:36 PM
| | Motorized Bicycle Elite Member | | Join Date: May 2009 Location: colorado
Posts: 488
| | Re: 3 speed jack shaft
Finally........I was wondering what that object was at the end of the hub shaft. I understand completely now. Is that the same 3 speed type hub from 3 speed bikes in the 70s or a completely different design being more heavy duty? .......TY ALL FOR YOUR INPUT. |
09-28-2009, 07:47 AM
| | Motorized Bicycle Elite Member | | Join Date: May 2009 Location: acme labs
Posts: 176
| | Re: 3 speed jack shaft
it's a non coaster brake hub from a 70's bike. has the push rod shift instead of the little chain. i took the casette hub off of a 10 speed wheel, milled it to fit over the left end of the 3 speed hub and welded it on. now i can swap the left side sprocket on the hub with any of the gears from the 10 speed to change ratios if i want to get more or less reduction. |
09-28-2009, 11:25 AM
| | Motorized Bicycle Senior Member | | Join Date: May 2009 Location: ohio
Posts: 74
| | Re: 3 speed jack shaft
found the specs. -25% 1st 1-1 2nd +33% 3rd |
09-28-2009, 02:09 PM
|  | Motorized Bicycle Elite Member | | Join Date: Apr 2008 Location: Valparaiso, IN
Posts: 554
| | Re: 3 speed jack shaft
...and my earlier tooth numbers as a comparison was an estimate. I may run the exact numbers for reduction at some point as I have some 3 speed hubs and I am thinking of using one. |
09-28-2009, 06:02 PM
| | Motorized Bicycle Newbie | | Join Date: Apr 2009 Location: denmark
Posts: 13
| | Re: 3 speed jack shaft
hmm i wonder i it is possible to remove or lock the freewheel and brake arrangement on those old 3 speed. if possible then we could use them with the left side chaindrive of the ht engines, just by turning the wheel arround.
could this be possible or are this just a pipe dream?? |
09-28-2009, 06:32 PM
|  | Motorized Bicycle Elite Member | | Join Date: Jul 2009 Location: Mi
Posts: 650
| | Re: 3 speed jack shaft
Quote:
Originally Posted by BarelyAWake Jeebus, I've never seen the guts of a 3 speed hub before and now I know why!
That thing has more bits in it than the chinagirls do lol | Taking apart a 3 speed hub is like taking the mainspring out of a clock, more stuff comes out then could ever possibly go back in.  | | Thread Tools | | | | Display Modes |  Linear Mode | 
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