I picked up a 1972 CL175 without a title for $325. It has 6,500 miles on the odometer. The previous owner said he had stored the bike in a garage for several years before moving it outside.
I'm not sure how long the bike was outside, but it has seen the elements. Unfortunately, the muffler (which is my favorite part of the bike) is rusted straight through, so I have parts on the way to build a new one. Save for the muffler and a pair of corroded forks, the overall aesthetics of the bike are okay.
Carburetors are clean.
The motor is locked up. The right-hand spark plug seemed mostly clean, while the left plug revealed some gunk buildup. I've since pulled the motor out and have ordered a new gasket kit and piston rings.
I'm having some troubles in removing the valve head cover due to a tricky bolt placement, but I'll post about that below.
I wish I had taken some more photos of the assembled bike, but that ship has already sailed. Apologies for the sideways ones—not sure how to correct that.
Any input about this bike would be much appreciated!
Last edited by gavinbpugh; 04-17-2019 at 07:13 PM.
That "hidden" 6 mm bolt just requires a "skinny" 10 mm hex socket....I use a six-point, 1/4" drive, short socket on an extension.....
"I have a mind like a steel trap.....Old and rusty, of antiquated design, and hard to get stuff back out of...."
Contact info: E-mail; [email protected] Phone; 540-525-5199
Here's some information about the picture orientation
Found a smaller 10mm socket and the valve cover came right off.
I have both the points and the tach housings off, but the chain is proving to be difficult to work with. Anyone with experience removing the cam?
Also, does anyone have the shop manual for this bike they could PM me?
Not great news about the cylinders.
There is some pretty bad corrosion/buildup in both chambers. The pistons are about 1-2 cm down from TDC.
The cylinders are REALLY stuck on there. I've tried combinations of using a heat gun, tapping the sides with a rubber mallet, pressing the kickstart lever... no use. I seem to recall my CM400's cylinders had a lip on the bottom for prying off, but do the earlier twins not have that? Any tips on getting this darn thing off?
I would suggest totally stripping the unit down, ie remove the side covers, clutch etc, then split the cases and remove the gear clusters etc, so that you are just left with the upper crankcase and crankshaft. With the case suitably supported, so that there is no load on the crankshaft, it may then be possible to tap the pistons down their bores.
If that fails, try some penetrating fluid, diesel fuel, etc, leave it to soak, see if that frees it off.
If all else fails, a hole saw in an electric drill will remove (destroy) the stuck piston.
Last edited by Richard_Pitman; 04-19-2019 at 01:56 PM.
1970 Honda CB175K4
1972 Honda CL175K7
1999 Honda CB600 Hornet
pneumatic hammer usually makes quick work of it if you have one.