Surflex S1425 Clutch Kit...
Posted: Mon Jun 15, 2015 2:44 pm
Hi Folks;
I spent a few moments wondering exactly where to post this enquiry as the Surflex clutch noted in the title appears to fit so many Ducati models... 750GT/S/SS/GTS 860 GT/SS 900 SS/HRI/SD (and perhaps more).
It also fits the Hesketh V1000... Especially mine, which has a pre-producton engine... Parts of this may appear familiar to some:
So, apologies if this thread appears in the wrong board (I'm sure admin will help me out if it is) as it's clearly not a Squarecase engine...
My problem is that the clutch is slipping... Not horribly, but bad enough...
I've spent AGES getting this auld beast to run well and now that she is, the clutch starts to let go at around 4K rpm...
It was happening last year whilst we were in Holland for the Hesketh Owner's Club annual rally... This year she's had a chassis rebuild, new tyres, new chain and sprockets (rear changed from 48T to 46T, which is 'standard') an oil change (Millers ZSS 10W40, same as last year) and a new exhaust system (VERY fruity..!).
The new pipes really let the engine breathe properly and, combined with the new gearing, the bike is running really well... Apart from the clutch slip...
I pulled off the cover to check the various bits and pieces last year... But, the measurements of the Surflex parts doesn't match the spec I have in the original Hesketh manual (that is, if they are ALL Surflex parts..?) The Surflex site doesn't give min/max spring lengths and plate thicknesses, and I'm using old catalogue info to determine how many plates there should be in there...
I have a set of NOS Hesketh plates too - less of them in the stack, thicker friction plates...
So... Could anyone kindly advise what the min thickness should be for Surflex plates (steel and friction) and what, if anything, are the recognoseable differences between the various weights of springs available> Or even how to test the weight of these springs..?
I did search through the forum for "Clutch Slip" prior to posting... Found one thread referencing synthetic oil (the ZSS is semi-synth) which really help (I have seen probs with other bikes and modern oils with an abundance of friction modifiers).
Any help/advice gratefully accepted.
Miti
I spent a few moments wondering exactly where to post this enquiry as the Surflex clutch noted in the title appears to fit so many Ducati models... 750GT/S/SS/GTS 860 GT/SS 900 SS/HRI/SD (and perhaps more).
It also fits the Hesketh V1000... Especially mine, which has a pre-producton engine... Parts of this may appear familiar to some:
So, apologies if this thread appears in the wrong board (I'm sure admin will help me out if it is) as it's clearly not a Squarecase engine...
My problem is that the clutch is slipping... Not horribly, but bad enough...
I've spent AGES getting this auld beast to run well and now that she is, the clutch starts to let go at around 4K rpm...
It was happening last year whilst we were in Holland for the Hesketh Owner's Club annual rally... This year she's had a chassis rebuild, new tyres, new chain and sprockets (rear changed from 48T to 46T, which is 'standard') an oil change (Millers ZSS 10W40, same as last year) and a new exhaust system (VERY fruity..!).
The new pipes really let the engine breathe properly and, combined with the new gearing, the bike is running really well... Apart from the clutch slip...
I pulled off the cover to check the various bits and pieces last year... But, the measurements of the Surflex parts doesn't match the spec I have in the original Hesketh manual (that is, if they are ALL Surflex parts..?) The Surflex site doesn't give min/max spring lengths and plate thicknesses, and I'm using old catalogue info to determine how many plates there should be in there...
I have a set of NOS Hesketh plates too - less of them in the stack, thicker friction plates...
So... Could anyone kindly advise what the min thickness should be for Surflex plates (steel and friction) and what, if anything, are the recognoseable differences between the various weights of springs available> Or even how to test the weight of these springs..?
I did search through the forum for "Clutch Slip" prior to posting... Found one thread referencing synthetic oil (the ZSS is semi-synth) which really help (I have seen probs with other bikes and modern oils with an abundance of friction modifiers).
Any help/advice gratefully accepted.
Miti