Cranbrook rear sprocket problems!

lickerbox · #1 03-14-2010, 12:30 AM

I began building my first MB and I am using a Huffy Cranbrook. I have a 66cc Flying Horse from Bikeberry and I am finding it extremely difficult with the rear sprocket. The center hole for the sprocket is about 1/4'' smaller than the hub. I have read on here to remove coaster arm, and do away with the dust cover, done that and still wont fit. I did try to fit it to give me an idea of clearence for chain and with it centered on the wheel, it still wants to rub on the lower frame legs where the coaster brake would attach. I am assuming im going to have to mill the sprocket to fit over the hub, but still not alot of clearence especially with the outer rubber spacer in place. T heres really not much of the hub sticking out past the outer spokes for the sprocket to rest on. Ive worked on motorcycles and have had less frustrating times!! My calipers are showing 1'' 5/8 on the hub, and sprocket center is 1'' 7/16.

Any other suggestions would be appreciated.

**Bikeguy Joe** · #2 03-14-2010, 08:10 AM

Use a file to enlarge the sprocket hole enough to get it all back together WITH THE DUST CAP IN PLACE.

worksmanFL · #3 06-19-2010, 09:31 AM

Bike Guy,

I'm doing the same bike, rubber/rag joint sprocket installation on the rear tire

How much bigger than the dust cap?
(from end of dust cap to center hole in sprocket?
- 1/8" all around?
- 1/4" all around?
- 3/8" all around?

What is the easiest way to do this? (i was going to buy pirates hub and sprocket, but they no longer make the adapter, and I don't want to shim with what they have, as ive heard its not recommended.)

What tool(s) do you recommend for this? I'd like it to look good when finished, not butchered.

Thank you.

What if you remove the bolt at the brake arm side, and place the sprocket in that 1/8" gap between at the dust cover/ brake arm?

would that space be too tight?

masterlink · #4 06-19-2010, 06:44 PM

Im doing a build on the same bike, and ran into the same problems. My solution was to grind down the outside lip of the dust cover until it fit inside of the sprocket hole. As far as the brake arm, it will hit the sprocket mounting bolt heads, so I bent it out to clear the bolts, then bent it back in to attach it to the frame. I did grind on the brake arm a bit to get it to fit properly

worksmanFL · #5 06-19-2010, 09:03 PM

Thanks for the reply Masterlink!

Ive just gotten a contact who is a metal fabricator/machinist. Ill price out enlarging the center hole sprocket, im guessing an additional 3/4". 1/2 inch for "normal movement", leaving 3/8th" space if it sits just right all the way around. (between sprocket and dust cover.)

how far along is your build?

masterlink · #6 06-20-2010, 11:22 PM

Im done!

Kevlarr · #7 06-20-2010, 11:57 PM

Hey masterlink, why did you put the banana washers on the outside of the sprocket? Did your kit come with an extra set? They're not needed there and without them you probably wouldn't have needed to grind your brake arm.

asianflava · #8 06-21-2010, 02:30 AM

Quote:

Originally Posted by Kevlarr

Hey masterlink, why did you put the banana washers on the outside of the sprocket? Did your kit come with an extra set? They're not needed there and without them you probably wouldn't have needed to grind your brake arm.

Yep, I put all the banana washers inside the wheel. The unequal pair next to the rubber and the equal 3 on top of those with the joints staggered. The coaster brake arm cleared without any modifications.

My stack up was like this:

Bolts - sprocket - rubber rag joint - spokes - cut rubber rag joint - unequal pair of banana plates - equal 3 plates - flat washer -lock washer - nut

Creative Engineering · #9 06-23-2010, 09:16 AM

I see that you have the Falcon hub.

You may want to upgrade to the Shimano CB-110 hub

This is what happened to my Falcon hub after about 10 miles of easy riding.

http://motorbicycling.com/f3/falcon-...hub-13163.html

Jim

worksmanFL · #10 06-23-2010, 01:55 PM

Hi All, I posted this but I elsewhere, but I thought it belongs here too, same topic:

Cranbrook Sprocket Install.

??? Help ........ PLEASE ASSIST ???

Im having problems mounting the ragmount sprocket:

a. rubber discs seem too thick
b. rubber discs and metal banana attachers dont all align up,
(hitting part of hub/ sprocket too)
c. sprocket brake bar seems like it will hit the bolt heads when installed.
(some posted no mod./bending of cb arm required)

1. (went to a machine shop, and he wanted $45.00 to $70.00 to increase the sprocket hole size on 2 sprockets. ---> At this point, that option is cost prohibitive, knowing you can get a adapter, sprocket for $50.00 from PIRATE)

2.PIRATE is out of stock...it really does sound too painfully familiar.
--->JIIIIIIM! get your product out to Justin!

I've decided to either not reinstall dust cap,OR install it if it fits. (i dont want to grind down the dust cap.)

Im getting a little bit frazzled.

Sprocket concave or convex side out, whatever works.

Can anyone share several detailed PICS please of installed sprocket? and go over it with me?

I feel so inept, so stupid right now.

The instructions say 2 hours total build time - UNREAL...
I spent 4 "dry fitting"sprocket and I didn't even install a single thing!!! (not to mention the dozens of hours online trying to research the build.)

Sorry if i'm ranting.

Thanks for all your help in advance Guys/Gals.