S4R rear sprocket removal

DaveR · 26-09-2020, 04:37 PM

I am struggling to remove the pentagram shaped flange that holds the crush drives to the rear sprocket. it appears to be seized to the axle. Am I missing a circlip or key that holds this on?
I have a feeling that this may well be the first time that this will have been removed in 13 years, so there is a good chance that it might be very corroded. so far I've tried WD40, gentle heat & not so gentle big hammer.
I don't want to damage the flange, the sprocket itself moves on the axle ok, its just the flange that's the problem.
Also can anyone tell me what length chain I should have, the manual I have is for an S4R with the tetastressa engine, with says 103 + 1, but I've also seen 105 but I can't remember where.

Dave

Darren69 · 26-09-2020, 05:01 PM

Is this any help?

stopintime · 26-09-2020, 09:07 PM

The steel sleeve of the cush drives often get stuck in the sprocket. Lubrication and force.

It's 104 links.

DaveR · 27-09-2020, 12:40 PM

Thanks guys.
The exploded view is the same as the ones that I have Darren, so no hidden clips.
The flange is seized on the axle, must be very corroded, I need to try & remove it without damaging it.
104 links including the joint?
Dave

slob · 27-09-2020, 01:11 PM

It should include the master link. Put a blob of tipex or paint on a link to mark it, count the side plates and multiply by two.(when they say ‘links’, they actually mean ‘pins’)

26-09-2020, 04:37 PM	#1
DaveR Registered User Join Date: Jan 2017 Location: Colchester Bike: S4r Posts: 94	S4R rear sprocket removal I am struggling to remove the pentagram shaped flange that holds the crush drives to the rear sprocket. it appears to be seized to the axle. Am I missing a circlip or key that holds this on? I have a feeling that this may well be the first time that this will have been removed in 13 years, so there is a good chance that it might be very corroded. so far I've tried WD40, gentle heat & not so gentle big hammer. I don't want to damage the flange, the sprocket itself moves on the axle ok, its just the flange that's the problem. Also can anyone tell me what length chain I should have, the manual I have is for an S4R with the tetastressa engine, with says 103 + 1, but I've also seen 105 but I can't remember where. Dave

26-09-2020, 05:01 PM	#2
Darren69 Transmaniacon MOC Join Date: Sep 2013 Location: Sutton In Ashfield Bike: Multiple Monsters Posts: 6,022	Is this any help? __________________ Roast Beef Monster! Termignoni and Bucci - Italian for pipe and slippers! S4 Fogarty, S4R 07T, 748, Series 1 Mirage

26-09-2020, 09:07 PM	#3
stopintime Registered User Join Date: Dec 2010 Location: Oslo Bike: S2r Posts: 426	The steel sleeve of the cush drives often get stuck in the sprocket. Lubrication and force. It's 104 links.

27-09-2020, 12:40 PM	#4
DaveR Registered User Join Date: Jan 2017 Location: Colchester Bike: S4r Posts: 94	Thanks guys. The exploded view is the same as the ones that I have Darren, so no hidden clips. The flange is seized on the axle, must be very corroded, I need to try & remove it without damaging it. 104 links including the joint? Dave

27-09-2020, 01:11 PM	#5
slob . Join Date: Jul 2003 Location: East London Bike: Multiple Monsters Posts: 9,710	It should include the master link. Put a blob of tipex or paint on a link to mark it, count the side plates and multiply by two.(when they say ‘links’, they actually mean ‘pins’)