1972 CL175 restoration
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  1. #1
    Member gavinbpugh's Avatar
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    1972 CL175 restoration

    Hi there,

    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!

    1972 CL175 restoration-20190417_173616.jpg

    1972 CL175 restoration-20190410_190529.jpg

    1972 CL175 restoration-20190410_190541.jpg

    1972 CL175 restoration-20190406_135439.jpg
    Last edited by gavinbpugh; 04-17-2019 at 07:13 PM.

  2. #2
    Member gavinbpugh's Avatar
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    As for the bolt—I removed all acorn nuts, but there seems to be a 10mm bolt tucked away in the mounting bracket. My extended 10mm socket just won't fit. Is there a special Honda tool I'm missing?

    1972 CL175 restoration-20190417_180601.jpg

  3. #3
    Sensei 66Sprint's Avatar
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    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

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  5. #4
    Senior Member ancientdad's Avatar
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    Here's some information about the picture orientation

    https://www.hondatwins.net/forums/25...ml#post1008568
    Tom

    Ride along at the drag strip - https://www.youtube.com/watch?v=20jFPazXlvU



    running points... because I'm too old for mysteries that begin with pushing

  6. #5
    Member gavinbpugh's Avatar
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    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?

  7. #6
    Senior Member ancientdad's Avatar
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    PM longdistancerider, I believe he has one
    Tom

    Ride along at the drag strip - https://www.youtube.com/watch?v=20jFPazXlvU



    running points... because I'm too old for mysteries that begin with pushing

  8. #7
    Member gavinbpugh's Avatar
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    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?

    1972 CL175 restoration-20190419_120048.jpg

  9. #8
    Senior Member Richard_Pitman's Avatar
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    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.

    1972 CL175 restoration-dscf2565.jpg 1972 CL175 restoration-ngin21.jpg
    Last edited by Richard_Pitman; 04-19-2019 at 01:56 PM.
    1970 Honda CB175K4
    1972 Honda CL175K7
    1999 Honda CB600 Hornet

  10. #9
    Senior Member middletons's Avatar
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    pneumatic hammer usually makes quick work of it if you have one.
    1972 CL450
    1972 CL350
    1975 CB360

  11. #10
    Member gavinbpugh's Avatar
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    No pneumatic hammer, unfortunately.

    This is the current stage of disassembly of the motor. I can't tell based on the language of the shop manual, but at what point can I crack the case open? Do I have to remove the outer clutch basket and oil pump before I can open the crankcase?

    1972 CL175 restoration-20190419_175216.jpg

    1972 CL175 restoration-20190419_181919.jpg

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