Honda Twins banner

1 - 5 of 5 Posts

·
Registered
Joined
·
5 Posts
Discussion Starter · #1 ·
I’m looking for a new exhaust for my Cm185t and while I looked into the overpriced option of buying a used one seems they fetch crazy money. I did find some reasonably priced cl72 exhausts that look to be a similar fit does anyone know if they’ll mount up straight? I’m fine with making brackets.
 

·
Registered
Joined
·
3,250 Posts
Off to ebay we go to compare dimensions of exhaust gaskets, an easy disqualifying step.

Ok, here's an auction from the good folks at 4into1:
Ebay CL72 exhaust gaskets
Equivalent to Honda part numbers: 18291-MM5-860, 18291-254-000
Outer Diameter = 45mm
Inner Diameter = 37mm
Thickness = 4mm
Fits Honda:
CA71 Dream Touring 250 - 1959-1969
CE71 Dream Sport 250 - 1959-1960
C72 Dream Touring 250 - 1961
CA72 Dream Touring 250 - 1960-1966
CB72 Hawk 250 - 1961-1966
CL72 Scrambler 250 - 1962-1965
CRF250R - 2004-2015
CRF250X - 2004-2013
NX250 - 1988-1990
C76 Dream Touring 300 - 1959-1960
CA76 Dream Touring 300 - 1959-1960
CS76 Dream Sport 300 - 1960
CSA76 Dream Sport 300 - 1960
C77 Dream Touring 305 - 1961-1964
CA77 Dream Touring 305 - 1960-1969
CB77 Superhawk 305 - 1961-1968
CL77 Scrambler 305 - 1965-1968
CSA77 Dream Sport 305 (CS77) - 1960-1963
FT500 Ascot - 1982-1983
VT600C Shadow VLX - 1988-2007
VT600CD Shadow VLX Deluxe - 1993-2007
NT650 Hawk GT - 1988-1991
TRX650F - 2003-2005
TRX680F - 2006-2016
CB700SC Nighthawk S - 1984-1986
MUV700 - 2009-2013
CB750A Hondamatic - 1976-1978
CB750C Custom - 1980-1982
CB750F Super Sport - 1975-1982
CB750K - 1969-1982
CB750 Nighthawk - 1991-2003
CB750SC Nighthawk - 1982-1983
VT750C Shadow Aero - 2004-2007
VT750C/CD Shadow ACE - 1998-2003
VT750DC Shadow Spirit - 2001-2007
CB900C Custom - 1980-1982
CB900F Super Sport - 1981-1982
CBR900RR - 2000-2003
CBR900RE - 2001
CB1000 - 1994-1995
CB1000C Custom - 1983
CBR1000F - 1993-1996
CBR1000F Hurricane - 1987-1991
CBR1000R - 2008-2015
CB1100 - 2014
CB1100F - 1983
VFR1200F - 2014

But no CL72, at least not in that list.
So, back to ebay to search for an auction for CM185 exhaust gaskets that lists honda part numbers and dimensions....

Ok, here's one, fits CM185:
Fits CM185 4into1
Equivalent to Honda part numbers: 18291-MN5-650, 18291-216-000, 18291-390-306, 18291-390-000

Outer Diameter = 40mm
Inner Diameter = 32mm
Thickness = 4.2mm

Fits Honda:
CA160 Touring - 1966-1969
CB160 Sport - 1965-1969
CL160 Scrambler - 1966-1968
CA175K3 Touring - 1969-1970
CB175K Super Sport - 1969-1973
CL175K Scrambler - 1970-1973
SL175K Motosport - 1970-1972
CM185T Twinstar - 1978-1979
CB200 - 1974
CB200T - 1975-1976
CL200 Scrambler - 1974
CM200T Twinstar - 1980-1982
CB250 Nighthawk - 1991-2008
CM250C Custom - 1982-1983
CMX250C Rebel - 1985-2015
XL250R - 1982-1983
XR250R - 1981-1982
ATC350 - 1985-1986
TRX350 - 1986-1989
XL350R - 1984-1985
XR350R - 1983-1985
TRX400 - 1999-2014
XR400R - 1996-2004
GB500 Tourist Trophy - 1989-1990
XL500S - 1979-1981
XL500R - 1982
XR500 - 1979-1980
XR500R - 1981-1984
XL600R - 1983-1987
XR600R - 1985-2000
NX650 - 1988-1989
XR650L - 1993-2015
XR650R - 2000-2007


So, when we think about the inner diameter of the exhaust gasket being the important factor, the CL72 gaskets have an inner diameter of 37mm while the CM185 gaskets have an inner diameter of 32mm. That's 5mm or .196" difference, that's too big to ignore, and you really want to save CL72 exhaust systems for people who love CL72s since the number of available exhaust systems for CL72s is lower each year.

Odds are that an exhaust made for one bike will only fit bikes of very similar design, for instance CM185/CM200/CM250/CB250 Nighthawk/CMX250 Rebel, there may be some Fitment issues but the engines are relatively the same.
If you're interested in a scrambler exhaust and have some fabrication skills, I'd recommend starting with a full system from the list above that use the same gaskets, like XR/XL 400/500/600/650 and weld up your own. Remember that most Honda Streetbike exhausts are double-wall pipes to prevent the chrome from bluing when running lean, a problem plaguing many bikes, so the pipes from the XR/XL bikes are single wall and will appear visibly narrower to the eye. Correct inner diameter for exhaust tubing is essential, go too big and you sacrifice efficiency and horsepower.
 

·
Sensei
Joined
·
27,164 Posts
It isn't just pipe diameter.....The sloper engined bikes have a different exiting angle from the head.....
For instance, the CL175 KO (sloper) exhaust won't even fit the CL175 K3 (vertical) engine....Diameter is the same, but curvature and angle are different...... You can see the differences if you go here: Photo by Stephen Lohmeyer .... Painted head is vertical, silver one a sloper.....Both CL175's
 

·
Registered
Joined
·
51 Posts
The CD185 ones might work. They are a available from David Silver in the UK for USD 50 each

 
1 - 5 of 5 Posts
Top