CL350 engine top-end deconstruct, reconstruct
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Thread: CL350 engine top-end deconstruct, reconstruct

  1. #1
    Senior Member f100owner's Avatar
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    CL350 engine top-end deconstruct, reconstruct

    I am tearing down the top end as part of an effort to get the thing running - we found a couple of things that did not make sense and so at the behest of my HondaTwins mentor Steve, tore down the top end to get a look at the camshaft. Well it is now being sent out to vacation on the west coast with Delta Cams as it had some pitting.
    At this point, I have not removed the jugs. I am going to be replacing the eight studs (one was poorly repaired) and yes I can do that without removing the jugs. My question is when I pull the jugs are there any gotcha's removing or re-installing? A coworker with a lot of experience on these bikes indicated there was not much to it and said I would not need a ring compressor or the like to get the pistons back into to the cylinders.
    It has been a long time since I have done this and then it was on a Harley shovelhead and I think the cylinders are at opposite strokes, whereas I think the Honda twin stroke is the same (both at the top or bottom at the same time). I am probably way wrong. Also I had two separate jugs to work with, meaning I could work on one piston at a time.
    The last motorcycle engine I worked on is pictured in case anyone has an interest.
    CL350 engine top-end deconstruct, reconstruct-engine.lookingdown.jpg
    CL350K0
    2016 Harley Ultra Limited
    1971 Ford F100 Flareside (project)
    2016 Ford Expedition
    2018 Ford F150

  2. #2
    Sensei 66Sprint's Avatar
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    Nope....Should be a 180 degree crank....one piston up, one down
    Last edited by 66Sprint; 05-14-2019 at 11:57 AM.
    "I have a mind like a steel trap.....Old and rusty, of antiquated design, and hard to get stuff back out of...."
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  3. #3
    Senior Member 83XLX's Avatar
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    Yes, a 180 degree (TYPE 1) engine. The cylinders are pretty easy to slide over the pistons without a ring compressor, though. If you've ever done a twin with a 360 crank, the 180 degree ones are easy compared to that.
    1969 Honda CL350
    1983 H-D XLX-61 Sportster

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  5. #4
    Senior Member Pops's Avatar
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    One "gotcha" to watch out for...there are two small rubber retainers on top of the shaft for the lower camchain roller. It's very easy to drop those into the crankcase if you're not careful disassembling things. When you're pulling the jugs upward, make sure the base gasket between them and the engine case doesn't peel up, exposing the retainers. Number 11 in the illustration.
    CL350 engine top-end deconstruct, reconstruct-honda-cl350-scrambler-1968-k0-usa-cam-chain-tensioner_bighu0018e6006_a9be.jpg
    Last edited by Pops; 05-14-2019 at 12:58 PM.
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    Butch
    72 SL350 Basket Case

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  6. #5
    Senior Member f100owner's Avatar
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    Well, displayed my lack of knowledge of general engine function. As to the gotcha, definitely will make sure the gasket stays low. Hope it was not sealed somehow. I noticed one of the gaskets I removed was attached to the upper, not lower assembly. Seemed odd at the time.
    CL350 engine top-end deconstruct, reconstruct-head.jpg
    CL350K0
    2016 Harley Ultra Limited
    1971 Ford F100 Flareside (project)
    2016 Ford Expedition
    2018 Ford F150

  7. #6
    Senior Member f100owner's Avatar
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    Pulled the jugs today. Think I avoided the i gotchas. One of the cylinders doesn't look as clean as the other. Kind of expected markings on the pistons indicating 10 over or something. Could these be the factory pistons?
    Buying a set of studs from a forum member. May go ahead and swap out all. I did drop a couple drops of penetrating oil around each stud.

    Sent from my SAMSUNG-SM-G930A using Tapatalk
    CL350K0
    2016 Harley Ultra Limited
    1971 Ford F100 Flareside (project)
    2016 Ford Expedition
    2018 Ford F150

  8. #7
    Senior Member middletons's Avatar
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    The lower skirt on those pistons looks odd...
    1972 CL450
    1972 CL350
    1975 CB360

  9. #8
    Senior Member TOOLS1's Avatar
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    If they are not marked they are STD. Looks like you need an overbore and new pistons.
    TOOLS

  10. #9
    Senior Member f100owner's Avatar
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    Quote Originally Posted by TOOLS1 View Post
    If they are not marked they are STD. Looks like you need an overbore and new pistons.
    TOOLS
    Kind of expected that when I saw the right cylinder. Hopefully, the only machine shop I know (Clay's Machine Shop in San Antonio) can handle this. Guessing they will do these small cylinders.
    Would I expect that the first oversize (.25 over) would suffice.
    So the next ka-ching will be two pistons, two sets of rings and wrist pins and the machine shop work. I did notice that Common has the kits at about $155 each.
    Piston - 13102-312-010;
    Ring set - 13021-391-004.
    Are there good aftermarket options?
    Last edited by f100owner; 05-15-2019 at 06:06 AM.
    CL350K0
    2016 Harley Ultra Limited
    1971 Ford F100 Flareside (project)
    2016 Ford Expedition
    2018 Ford F150

  11. #10
    Senior Member TOOLS1's Avatar
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    From the pictures, I really doubt that they will clean up with only 0.25 MM. I do not even think a 0.50 mm will clean them up. Without actually holding them in my hands to look at them I would say you need a 1.00 mm overbore.
    Here is a link to the pistons I recommend to all my customers. https://www.ebay.com/itm/68-73-HONDA...8AAOSwAuZX5gbw
    TOOLS

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