Something has gone wrong at last!!

czowner · 10-05-2007, 03:43 AM

Half way to work last night , in the middle of noware the 4 drive pins on the rear sprocket shear leaving me with no drive. Don't think I'm the first to suffer this, I'll hunt out a set of standard ones and set about looking for something beefier.

Jonathan.

cresstt · 10-05-2007, 04:37 AM

is it the stud connected to the rim and the sprocket that sheared ? Maybe the rubber bushings are shot on all 4 ?

red2003 · 10-05-2007, 07:58 AM

Fatboy250 just posted about this. He used grade 8 american 1/2 in. bolts and tapped the sprocket to accept them. I think he just screwed them through the sprocket, and cut off the head of the bolt to make 1/2 in studs. Cheap fix if you got a little knowhow. My studs keep loosening up, even with locktite on them. Winter project is to do as Fatboy did, except with grade 12 bolts.

czowner · 10-05-2007, 05:25 PM

I've found a set of stock pins to keep me going, the pin's a bit of a strange size 9.15mm. There seems enough metal in the centre of the bush to drill it 10mm, the sprocket has a set of 8mm holes I could drill and tap 10mm, I could then make some studs form high tensile steel.

Jonathan.

10-05-2007, 03:43 AM	#1
czowner Join Date: Sep 2006 Location: North East England Posts: 313	Something has gone wrong at last!! Half way to work last night , in the middle of noware the 4 drive pins on the rear sprocket shear leaving me with no drive. Don't think I'm the first to suffer this, I'll hunt out a set of standard ones and set about looking for something beefier. Jonathan.
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10-05-2007, 07:58 AM	#3
red2003 Join Date: Jan 2007 Location: Northern Vermont, USA Posts: 1,251	Fatboy250 just posted about this. He used grade 8 american 1/2 in. bolts and tapped the sprocket to accept them. I think he just screwed them through the sprocket, and cut off the head of the bolt to make 1/2 in studs. Cheap fix if you got a little knowhow. My studs keep loosening up, even with locktite on them. Winter project is to do as Fatboy did, except with grade 12 bolts. __________________ First Chinabike: 2006 Roketa RSX200E Current Chinabikes: 2023 Titan DLX & 2022 Lifan KP Mini w/ 210cc BRT kit, 22 RWHP!
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10-05-2007, 04:37 AM	#2
cresstt Join Date: Jul 2006 Location: KL, Malaysia Posts: 33	is it the stud connected to the rim and the sprocket that sheared ? Maybe the rubber bushings are shot on all 4 ?
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10-05-2007, 05:25 PM	#4
czowner Join Date: Sep 2006 Location: North East England Posts: 313	I've found a set of stock pins to keep me going, the pin's a bit of a strange size 9.15mm. There seems enough metal in the centre of the bush to drill it 10mm, the sprocket has a set of 8mm holes I could drill and tap 10mm, I could then make some studs form high tensile steel. Jonathan.
	0