Uphill Racers

Go Back   Uphill Racers > Technical > Engine & Chassis
Register FAQ Members List Calendar Downloads Mark Forums Read

Reply
 
Thread Tools Display Modes
  #11  
Old 03-10-13, 10:34
Nick Skidmore's Avatar
Nick Skidmore Nick Skidmore is offline
Senior Member
 
Join Date: Mar 2007
Location: Shropshire
Posts: 685
Nick Skidmore will become famous soon enough
The smallest master cylinder I have used was .625 which is a Gnat's wotsit under 16mm which is still a good bit down on your larger 14mm cylinder.

You may find that you are not getting the required 9mm travel at the mastercylinder as typical pedal ratios are around the 6:1 so that might make your pedal very 'long' before it separates the plates sufficiently.
Reply With Quote
  #12  
Old 03-10-13, 10:38
AllanMcD's Avatar
AllanMcD AllanMcD is offline
Senior Member
 
Join Date: Jan 2009
Location: Dalbeattie SW Scotland
Posts: 931
AllanMcD will become famous soon enough
Are you sure the steel plates are ok.
If they have been overheated they warp and then neutral is very difficult to find.
Allan
__________________
aandgmotorcycles co uk
Reply With Quote
  #13  
Old 03-10-13, 11:08
Clive Austin's Avatar
Clive Austin Clive Austin is offline
The Empire Strikes Back..
 
Join Date: Jul 2009
Location: Worcestershire
Posts: 916
Clive Austin will become famous soon enough
I'm getting the 9mm Nick. Measured it this morning. If anything a little more but difficult to measure accurately. None of the plates were blued Allan but I'll put them on a flat plate once I strip it and check for warpage. When I did the general clean up I did notice some slight roughness on a couple of the friction pads but nothing particularly major so I'd be surprised if this was the cause - but then this is the first time I've been up close and personal with a clutch so have no experience to base it on.

Any views on the oil type / level out there?

New clutch has just arrived but missing a steel and gasket so can't assemble until tomorrow :-(.
__________________
Latent Magnificence!
Reply With Quote
  #14  
Old 03-10-13, 11:12
andylaurence's Avatar
andylaurence andylaurence is offline
Senior Member
 
Join Date: May 2010
Location: Bristol
Posts: 1,536
andylaurence will become famous soon enough
I'm using a .625 master on my K8. No slip at the top of the travel and I don't have to push it all the way down to fully disengage. Not sure what the pedal travel or clutch travel is off the top of my head. Would viscous coupling of the clutch from over-filling with oil really push the car forwards uphill? It sounds a little strange.
Reply With Quote
  #15  
Old 03-10-13, 11:38
James Williams's Avatar
James Williams James Williams is offline
Senior Member
 
Join Date: Feb 2007
Location: Stockton, Warks
Posts: 273
James Williams is on a distinguished road
It does seem odd. You haven’t got ludicrously stiff clutch springs in there which are buckling the rod or the slave housing have you?
Reply With Quote
  #16  
Old 03-10-13, 11:44
Clive Austin's Avatar
Clive Austin Clive Austin is offline
The Empire Strikes Back..
 
Join Date: Jul 2009
Location: Worcestershire
Posts: 916
Clive Austin will become famous soon enough
Quote:
Originally Posted by James Williams View Post
It does seem odd. You haven’t got ludicrously stiff clutch springs in there which are buckling the rod or the slave housing have you?
Standard springs as far as I can tell James and the pedal doesn't feel overly stiff. I have some new ones with the replacement clutch though so these should be bog standard. I'd be amazed if they could buckle the rod though - its about 4mm of hardened steel. There are no visible signs of flexing in the slave cover but its difficult to be certain if the tolerances are so small.
__________________
Latent Magnificence!
Reply With Quote
  #17  
Old 03-10-13, 11:46
team knifedge's Avatar
team knifedge team knifedge is offline
Return of The Sith
 
Join Date: Jan 2007
Location: I can hear The World Famous
Posts: 1,096
team knifedge will become famous soon enough team knifedge will become famous soon enough
odd and very tedious - it's the only niggle in an otherwise impressive debut....Clive has the patience of Job at the moment...
Reply With Quote
  #18  
Old 03-10-13, 12:29
AllanMcD's Avatar
AllanMcD AllanMcD is offline
Senior Member
 
Join Date: Jan 2009
Location: Dalbeattie SW Scotland
Posts: 931
AllanMcD will become famous soon enough
Fully synthetic oil wont make your clutch drag.
I used to get through a clutch every day I raced at Scarborough on my bikes and I tried semi synthetic and fully synthetic oil but it was just the same and I never had drag until I cooked the steel plates.
Allan
__________________
aandgmotorcycles co uk
Reply With Quote
  #19  
Old 03-10-13, 12:40
team knifedge's Avatar
team knifedge team knifedge is offline
Return of The Sith
 
Join Date: Jan 2007
Location: I can hear The World Famous
Posts: 1,096
team knifedge will become famous soon enough team knifedge will become famous soon enough
sounds to me like the steels then Allan...I hope it's something that simple as Clive has been pulling his hair out..............
Reply With Quote
  #20  
Old 03-10-13, 12:54
Joshua's Avatar
Joshua Joshua is offline
Senior Member
 
Join Date: Jan 2010
Location: Malta
Posts: 229
Joshua is on a distinguished road
My bet is that if you put in a new set of plates you will be fine. Dragging clutch and not being able to find neutral is always a sign of a tired bike clutch. The fully synthetic oil has nothing to do with it.

Let us know how it goes once you replace the steel plates.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +1. The time now is 12:10.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Copyright© 2007-2018 Uphill Racers www.uphillracers.com