THRASHED Posted June 20, 2017 Share Posted June 20, 2017 I have rebuilt my clutch master cylinder a couple of times now. First with a cheap kit, then with a more OEM listed one (probably the same thing with different packaging). Anyway, I am again seeing the fluid turn dark and I get leak down when the clutch is pulled in. What I mean by that is that when I am sitting at a light the engagement slowly changes until it is so far out that if I don't catch it the bike stalls. This bike set for 18 years in a garage before I got it so I'm thinking there may be some corrosion inside the bore. I have cleaned it with a green scotch brite pad using DOT4 as a lubricant and it certainly looks clean but it may be possible that there are some pores I can't see that are causing abrasion on the rubber plunger. I'm going to flush it again this weekend, but I'm now considering trying to source a new master cylinder. I've seen some info on checking for similar bore sizes but has anyone has luck with a newer Interceptor master on their older bike? Thanks, Scott Link to comment Share on other sites More sharing options...
Member Contributer Forbes Posted June 20, 2017 Member Contributer Share Posted June 20, 2017 18 years, man someone couldn't have been that busy not to ride.....oh well, great find!Fluid turning dark? Is that in the reservoir? Either rust, but casing is Ali/magnesium, so must be the rubber plunger breaking down. Does it feel tacky when you remove it? It shouldn't! Does the internal sleave feel rough enough that it will wear plunger that quickly? What about the slave cylinder on the motor? Finally, is it bled properly....clutches are not like brakes, takes a lot to get all the air out as the clutch does not offer solid resistance. Advice here is to remove slave cylinder and place a clamp over it to stop movement there. Hope you get it sorted soon.Sent from my HTC_PN071 using Tapatalk Link to comment Share on other sites More sharing options...
Member Contributer Terry Posted June 20, 2017 Member Contributer Share Posted June 20, 2017 AFAIK most Honda clutch masters use the same bore size. If you look up the part number for the VFR700 master piston kit, you wiil find the following bikes all use the same piece, so finding a used replacement should be very easy: 1982 VF750C A CLUTCH MASTER CYLINDER 1982 VF750S A CLUTCH MASTER CYLINDER 1983 CB550SC A CLUTCH MASTER CYLINDER 1983 CB650SC A CLUTCH MASTER CYLINDER 1983 VF750C A CLUTCH MASTER CYLINDER 1983 VF750F A CLUTCH MASTER CYLINDER 1983 VF750S A CLUTCH MASTER CYLINDER 1983 VT750C A CLUTCH MASTER CYLINDER 1984 CB650SC A CLUTCH MASTER CYLINDER 1984 CB650SC AC CLUTCH MASTER CYLINDER 1984 CB700SC A CLUTCH MASTER CYLINDER + LEFT CONTROL LEVER 1984 CB700SC AC CLUTCH MASTER CYLINDER + LEFT CONTROL LEVER 1984 VF1000F A CLUTCH MASTER CYLINDER 1984 VF1000F AC CLUTCH MASTER CYLINDER 1984 VF500C A CLUTCH MASTER CYLINDER 1984 VF500C AC CLUTCH MASTER CYLINDER 1984 VF500F A CLUTCH MASTER CYLINDER 1984 VF500F AC CLUTCH MASTER CYLINDER 1984 VF700C A CLUTCH MASTER CYLINDER 1984 VF700C AC CLUTCH MASTER CYLINDER 1984 VF700F A CLUTCH MASTER CYLINDER 1984 VF700F AC CLUTCH MASTER CYLINDER 1984 VF700S A CLUTCH MASTER CYLINDER 1984 VF700S AC CLUTCH MASTER CYLINDER 1984 VF750F A CLUTCH MASTER CYLINDER 1984 VF750F AC CLUTCH MASTER CYLINDER 1984 VT700C A CLUTCH MASTER CYLINDER 1984 VT700C AC CLUTCH MASTER CYLINDER 1985 CB650SC A CLUTCH MASTER CYLINDER 1985 CB650SC AC CLUTCH MASTER CYLINDER 1985 CB700SC A CLUTCH MASTER CYLINDER + LEFT CONTROL LEVER 1985 CB700SC AC CLUTCH MASTER CYLINDER + LEFT CONTROL LEVER 1985 VF1000R A CLUTCH MASTER CYLINDER 1985 VF1000R AC CLUTCH MASTER CYLINDER 1985 VF500C A CLUTCH MASTER CYLINDER 1985 VF500C AC CLUTCH MASTER CYLINDER 1985 VF500F A CLUTCH MASTER CYLINDER 1985 VF500F AC CLUTCH MASTER CYLINDER 1985 VF700C A CLUTCH MASTER CYLINDER 1985 VF700C AC CLUTCH MASTER CYLINDER 1985 VF700F A CLUTCH MASTER CYLINDER 1985 VF700F AC CLUTCH MASTER CYLINDER 1985 VF700S A CLUTCH MASTER CYLINDER 1985 VF700S AC CLUTCH MASTER CYLINDER 1985 VT700C A CLUTCH MASTER CYLINDER 1985 VT700C AC CLUTCH MASTER CYLINDER 1986 CB700SC A CLUTCH MASTER CYLINDER + LEFT CONTROL LEVER 1986 CB700SC AC CLUTCH MASTER CYLINDER + LEFT CONTROL LEVER 1986 VF1000R A CLUTCH MASTER CYLINDER 1986 VF1000R AC CLUTCH MASTER CYLINDER 1986 VF500F A CLUTCH MASTER CYLINDER 1986 VF500F AC CLUTCH MASTER CYLINDER 1986 VF700C A CLUTCH MASTER CYLINDER 1986 VF700C AC CLUTCH MASTER CYLINDER 1986 VFR700F A CLUTCH MASTER CYLINDER 86 1986 VFR700F AC CLUTCH MASTER CYLINDER 86 1986 VFR700F2 A CLUTCH MASTER CYLINDER 86 1986 VFR700F2 AC CLUTCH MASTER CYLINDER 86 1986 VFR750F A CLUTCH MASTER CYLINDER 1986 VFR750F AC CLUTCH MASTER CYLINDER 1986 VT700C A CLUTCH MASTER CYLINDER 1986 VT700C AC CLUTCH MASTER CYLINDER 1987 CBR1000F A CLUTCH MASTER CYLINDER 1987 CBR1000F AC CLUTCH MASTER CYLINDER 1987 VF700C A CLUTCH MASTER CYLINDER 1987 VF700C AC CLUTCH MASTER CYLINDER 1987 VFR700F2 A CLUTCH MASTER CYLINDER 87 1987 VFR700F2 AC CLUTCH MASTER CYLINDER 87 1987 VT700C A CLUTCH MASTER CYLINDER 1987 VT700C AC CLUTCH MASTER CYLINDER 1988 CBR1000F A CLUTCH MASTER CYLINDER 1988 CBR1000F AC CLUTCH MASTER CYLINDER 1988 VF750C A CLUTCH MASTER CYLINDER 1988 VF750C AC CLUTCH MASTER CYLINDER 1988 VT800C A CLUTCH MASTER CYLINDER 1988 VT800C AC CLUTCH MASTER CYLINDER 1989 PC800 A CLUTCH MASTER CYLINDER 1989 PC800 AC CLUTCH MASTER CYLINDER 1990 CBR1000F A CLUTCH MASTER CYLINDER 1990 CBR1000F AC CLUTCH MASTER CYLINDER 1990 PC800 A CLUTCH MASTER CYLINDER 1990 PC800 AC CLUTCH MASTER CYLINDER 1990 VFR750F A CLUTCH MASTER CYLINDER 1990 VFR750F AC CLUTCH MASTER CYLINDER 1990 VFR750R A CLUTCH MASTER CYLINDER 1990 VFR750R AC CLUTCH MASTER CYLINDER 1991 CBR1000F A CLUTCH MASTER CYLINDER 1991 CBR1000F AC CLUTCH MASTER CYLINDER 1991 ST1100 A CLUTCH MASTER CYLINDER 1991 ST1100 AC CLUTCH MASTER CYLINDER 1991 VFR750F A CLUTCH MASTER CYLINDER 1991 VFR750F AC CLUTCH MASTER CYLINDER 1992 ST1100 A CLUTCH MASTER CYLINDER 1992 ST1100 AC CLUTCH MASTER CYLINDER 1992 ST1100A AC CLUTCH MASTER CYLINDER 1992 VFR750F A CLUTCH MASTER CYLINDER 1992 VFR750F AC CLUTCH MASTER CYLINDER 1993 CBR1000F A CLUTCH MASTER CYLINDER 1993 CBR1000F AC CLUTCH MASTER CYLINDER 1993 ST1100 A CLUTCH MASTER CYLINDER 1993 ST1100 AC CLUTCH MASTER CYLINDER 1993 ST1100A AC CLUTCH MASTER CYLINDER 1993 VFR750F A CLUTCH MASTER CYLINDER 1993 VFR750F AC CLUTCH MASTER CYLINDER 1994 CB1000 A CLUTCH MASTER CYLINDER 1994 CB1000 AC CLUTCH MASTER CYLINDER 1994 CBR1000F A CLUTCH MASTER CYLINDER 1994 CBR1000F AC CLUTCH MASTER CYLINDER 1994 PC800 A CLUTCH MASTER CYLINDER 1994 PC800 AC CLUTCH MASTER CYLINDER 1994 RVF750R A CLUTCH MASTER CYLINDER 1994 ST1100 A CLUTCH MASTER CYLINDER 1994 ST1100 AC CLUTCH MASTER CYLINDER 1994 ST1100A A CLUTCH MASTER CYLINDER 1994 ST1100A AC CLUTCH MASTER CYLINDER 1994 VFR750F A CLUTCH MASTER CYLINDER 1994 VFR750F AC CLUTCH MASTER CYLINDER 1995 CB1000 A CLUTCH MASTER CYLINDER 1995 CB1000 AC CLUTCH MASTER CYLINDER 1995 CBR1000F A CLUTCH MASTER CYLINDER 1995 CBR1000F AC CLUTCH MASTER CYLINDER 1995 PC800 A CLUTCH MASTER CYLINDER 1995 PC800 AC CLUTCH MASTER CYLINDER 1995 ST1100 A CLUTCH MASTER CYLINDER 1995 ST1100 AC CLUTCH MASTER CYLINDER 1995 ST1100A A CLUTCH MASTER CYLINDER 1995 ST1100A AC CLUTCH MASTER CYLINDER 1995 VFR750F A CLUTCH MASTER CYLINDER 1995 VFR750F AC CLUTCH MASTER CYLINDER 1996 CBR1000F A CLUTCH MASTER CYLINDER 1996 CBR1000F AC CLUTCH MASTER CYLINDER 1996 PC800 A CLUTCH MASTER CYLINDER 1996 PC800 AC CLUTCH MASTER CYLINDER 1996 ST1100 A CLUTCH MASTER CYLINDER 1996 ST1100 AC CLUTCH MASTER CYLINDER 1996 ST1100A A CLUTCH MASTER CYLINDER 1996 ST1100A AC CLUTCH MASTER CYLINDER 1996 VFR750F A CLUTCH MASTER CYLINDER 1996 VFR750F AC CLUTCH MASTER CYLINDER 1997 CBR1100XX A CLUTCH MASTER CYLINDER 1997 CBR1100XX AC CLUTCH MASTER CYLINDER 1997 PC800 A CLUTCH MASTER CYLINDER 1997 PC800 AC CLUTCH MASTER CYLINDER 1997 ST1100 A CLUTCH MASTER CYLINDER 1997 ST1100 AC CLUTCH MASTER CYLINDER 1997 ST1100A A CLUTCH MASTER CYLINDER 1997 ST1100A AC CLUTCH MASTER CYLINDER 1997 VFR750F A CLUTCH MASTER CYLINDER 1997 VFR750F AC CLUTCH MASTER CYLINDER 1998 CBR1100XX A CLUTCH MASTER CYLINDER 1998 CBR1100XX AC CLUTCH MASTER CYLINDER 1998 PC800 A CLUTCH MASTER CYLINDER 1998 PC800 AC CLUTCH MASTER CYLINDER 1998 ST1100 A CLUTCH MASTER CYLINDER 1998 ST1100 AC CLUTCH MASTER CYLINDER 1998 ST1100A A CLUTCH MASTER CYLINDER 1998 ST1100A AC CLUTCH MASTER CYLINDER 1998 VFR800FI A CLUTCH MASTER CYLINDER 1998 VFR800FI AC CLUTCH MASTER CYLINDER 1998 VTR1000F A CLUTCH MASTER CYLINDER 98-04 1998 VTR1000F AC CLUTCH MASTER CYLINDER 98-04 1999 ST1100 A CLUTCH MASTER CYLINDER 1999 ST1100 AC CLUTCH MASTER CYLINDER 1999 ST1100A A CLUTCH MASTER CYLINDER 1999 ST1100A AC CLUTCH MASTER CYLINDER 1999 VFR800FI A CLUTCH MASTER CYLINDER 1999 VFR800FI AC CLUTCH MASTER CYLINDER 1999 VTR1000F A CLUTCH MASTER CYLINDER 98-04 1999 VTR1000F AC CLUTCH MASTER CYLINDER 98-04 2000 ST1100 A CLUTCH MASTER CYLINDER 2000 ST1100 AC CLUTCH MASTER CYLINDER 2000 ST1100A A CLUTCH MASTER CYLINDER 2000 ST1100A AC CLUTCH MASTER CYLINDER 2000 VTR1000F A CLUTCH MASTER CYLINDER 98-04 2000 VTR1000F AC CLUTCH MASTER CYLINDER 98-04 2001 ST1100 A CLUTCH MASTER CYLINDER 2001 ST1100 AC CLUTCH MASTER CYLINDER 2001 ST1100A A CLUTCH MASTER CYLINDER 2001 ST1100A AC CLUTCH MASTER CYLINDER 2001 VFR800FI A CLUTCH MASTER CYLINDER 2001 VTR1000F A CLUTCH MASTER CYLINDER 98-04 2001 VTR1000F AC CLUTCH MASTER CYLINDER 98-04 2002 ST1100 A CLUTCH MASTER CYLINDER 2002 ST1100 AC CLUTCH MASTER CYLINDER 2003 ST1100P A CLUTCH MASTER CYLINDER 2003 VTR1000F A CLUTCH MASTER CYLINDER 98-04 2003 VTR1000F AC CLUTCH MASTER CYLINDER 98-04 2004 VTR1000F A CLUTCH MASTER CYLINDER 98-04 2004 VTR1000F AC CLUTCH MASTER CYLINDER 98-04 2005 VTR1000F A CLUTCH MASTER CYLINDER 05 2005 VTR1000F AC CLUTCH MASTER CYLINDER 05 Link to comment Share on other sites More sharing options...
THRASHED Posted June 21, 2017 Author Share Posted June 21, 2017 Thanks to you both. I have a vacuum bleeder and have bled it with the slave off of the bike while rotating it. I flushed it again today but thanks a lot Terry for that list. I saw threads mentioning how to look that up but haven't had time to do it. Looks like I have a few options. Link to comment Share on other sites More sharing options...
tedric77 Posted June 24, 2017 Share Posted June 24, 2017 Has Forbes said check your slave cylinder. Dismantle and clean it thoroughly. Get a new rubber seal and piston if its badly worn while your at it. you ill be surprised ho much crap gets in there and the seal does deteriorate over time. Link to comment Share on other sites More sharing options...
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