1972 CL175 restoration - Page 2
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  1. #11
    Supporting Member CB2NR's Avatar
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    I’ve had some luck soaking the tops of the pistons with a 50/50 mix of acetone and ATF (automatic transmission fluid) or MMO (Marvel Mystery oil). You’ll need to let it sit for days, tapping it lightly with a block of wood and hammer. Richards suggestion of splitting the cases might be prudent. Having the weight of the crankshaft might help to leverage the task. Keep in mind you want to ease the pistons out at the same rate.

    The rust tends to etch the liners and you’ll need to measure them to see if they can be machined for oversized pistons and rings.

    Good luck!
    -Ray

    "Remembering the past... Liv'n the dream"

    1971 CB175K5, restored http://www.hondatwins.net/forums/1-p...storation.html
    1972 CB350, Cafe, current project http://www.hondatwins.net/forums/1-p...-mod-cafe.html

  2. #12
    Senior Member Richard_Pitman's Avatar
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    Do I have to remove the outer clutch basket and oil pump before I can open the crankcase?
    Yes, because the oil pump is bolted to the lower case half, and cannot be safely removed without taking off the clutch basket first. Yes, you could unbolt the pump and wiggle the pump plunger out, but it's not good practice.

    The oil spinner has to come off in order to remove the crank gears which mesh with the clutch basket gear, you need a special tool to undo the crank shaft nut inside the oil spinner. Use a handle bar bolt ( or similar ) to draw off the oil spinner cover, don't try pulling it out with pliers.

    On the other side of the engine, the generator rotor / starter clutch does not need to be removed.

    When separating the cases, remember that there is hidden bolt beneath the oil drain plug. This caught me out first time I had a 175 apart.
    Last edited by Richard_Pitman; 04-20-2019 at 01:51 AM.
    1970 Honda CB175K4
    1972 Honda CL175K7
    1999 Honda CB600 Hornet

  3. #13
    Member gavinbpugh's Avatar
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    Thanks for the thorough response! I'll try giving it a go this afternoon.

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  5. #14
    Member gavinbpugh's Avatar
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    I've removed the oil pump, oil filter housing and clutch basket.

    I'm now trying to remove the shifter components. The manual says I need split the cases to disassemble the shifter, kickstarter and other parts. But all of those parts seem to be interlocked in a way that would make splitting the cases difficult without removing them first.

    Also, the impact driver couldn't even handle the phillips screws holding the shifter drum in place (top left). I would prefer to not drill out that screw and risk stripping the threads. Did I just create a problem for myself?

    1972 CL175 restoration-20190424_182119.jpg

  6. #15
    Member gavinbpugh's Avatar
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    Also, the case and cylinders are pretty grimy due to the decades-old oil. I plan on soaking most engine parts in a 50/50 mixture of simple green and water, followed by thorough scrubbing. To avoid corrosion, I'm thinking of simply blasting the parts with my heat gun while they lay out in the sun, followed rubbing all the parts down with MMO.

    Does anyone see any possible chance for this going awry? I'm mostly concerned about the cylinder jugs.

  7. #16
    Sensei 66Sprint's Avatar
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    On the engine's left side, remove the circlip/snapring and special washer from the shift shaft.....You can then pull slightly downwards on the shifter pawls and the pull the entire shaft out of the engine.....

    Having NO idea where you are located (you didn't add it to your profile or signature), All I can do is offer my phone number for further disassembly instructions....I'm NOT typing this all out for the umpteenth time.....
    540-525-5199......
    Last edited by 66Sprint; 04-26-2019 at 01:50 PM.
    "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

  8. #17
    Member gavinbpugh's Avatar
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    Finally had the time to split the cases.

    I could tell the kick starter was not engaging like it should. Turns out the kickstart gear is broken in half, which I heard is pretty common with these bikes. So I'll be ordering another one of those!

    1972 CL175 restoration-20190427_150913.jpg

    After sorting all that away, I tried several different methods of dislodging the pistons from the cylinders. They are really stuck in there, but I'm really hoping to save the sleeves and pistons.

    My current approach is letting the weight of the crankshaft pull down on the pistons while the crank case is supported by two wooden blocks. The piston heads are soaking in penetrating oil, and I'll occasionally blast the outside of the motor with the heat gun while and then tapping on the piston heads with a wood block and mallet.

    1972 CL175 restoration-20190427_184437.jpg

    I'm really hoping I don't have to source new pistons and cylinders, but we'll see.
    1972 CL175 (rebuilding)
    1981 CM400E (recently sold)

  9. #18
    Member gavinbpugh's Avatar
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    FINALLY got the pistons out. They're toast, but the cylinders looks like they only need a hone. I've got new pistons on the way.

    Next up—cleaning the engine head and lapping the valves.
    1972 CL175 (rebuilding)
    1981 CM400E (recently sold)

  10. #19
    Member gavinbpugh's Avatar
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    Also, anyone hunting for NOS standard bore 175 pistons should check this page on ebay. They were the cheapest I could find at ~$60 for the pair, and it looks like they have 5 left.
    1972 CL175 (rebuilding)
    1981 CM400E (recently sold)

  11. #20
    Member gavinbpugh's Avatar
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    Thinking of pulling the trigger on this kick starter pinion listed on ebay. I heard the CB200 uses the same part.

    Can anyone confirm this would be the correct part?

    EDIT: Looks like that's actually not the correct part at all. I'll keep hunting.
    Last edited by gavinbpugh; 05-01-2019 at 09:42 AM.
    1972 CL175 (rebuilding)
    1981 CM400E (recently sold)

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