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Thread: Removing material with a flex hone?

  1. #16
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    Quote Originally Posted by El Camexican View Post
    So what tools at you using to measure your piston and bore to 4th decimal place?
    Mitutoyo dial bore gauge.
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  2. #17
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    Are you sure that opening that bore .002” would be enough for a forged piston? I’m about the farthest thing from a piston fitting expert you’ll find on here, but I do know that a forged piston required a slightly larger bore and the numbers you posted look pretty tight.

    I’d contact Wiesco and ask them what size the bore should be for that piston.
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  3. #18
    barnett468 is offline FACT ! I have no edit button Arm chair racerThe day begins with 3WW
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    60 to 73 mm .0025"

  4. #19
    barnett468 is offline FACT ! I have no edit button Arm chair racerThe day begins with 3WW
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    Oops thats for a 2 stroke, back in a few minutes but they somerimes include that info with the piston.

  5. #20
    barnett468 is offline FACT ! I have no edit button Arm chair racerThe day begins with 3WW
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    Ok wiseco no longer gives piston clearances. They told me lsst week thst the piston will have the correct clearance when the cylinder bore is the correct size, meaning if the piston is for a 65 mm bore, then it will have the correct clearance when the bore is exactly 65 mm. My 465 bores were slightly under size plus they had some light scratches so i honed them out to the correct size and ended up with around .00025 clearance on an 85 mm bore but this is on an air cooled 2 stroke.

  6. #21
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    This:

    Quote Originally Posted by Gabriel View Post
    I just ordered a new a flex hone of appropriate size. I'm hoping to be able to get .002 or so worth of material out of there for proper clearance. Is this possible without screwing it up?
    Contradicts this:

    Quote Originally Posted by Gabriel View Post
    THIS is what you get when you DON'T have a shop fit the piston to the bore at the same time. *sigh*
    Why cut corners? To save money? Individuals spent lots of money and time restoring/rebuilding trikes, and they want to cut corners to save $25-$30? The local engine machine shop here charges 25.00 to hone .001-.003.

    Do it once and do it right the first time. That saves time AND money!
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  7. #22
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    Quote Originally Posted by barnett468 View Post
    Ok wiseco no longer gives piston clearances. They told me lsst week thst the piston will have the correct clearance when the cylinder bore is the correct size, meaning if the piston is for a 65 mm bore, then it will have the correct clearance when the bore is exactly 65 mm. My 465 bores were slightly under size plus they had some light scratches so i honed them out to the correct size and ended up with around .00025 clearance on an 85 mm bore but this is on an air cooled 2 stroke.
    I was told this by my machinist quite some time ago, he's been in business since '75, but he still requires the piston goes with the cylinder for boring and honing. I also verify clearances when I get the piston and cylinder back before I reassemble.
    Quote Originally Posted by fabiodriven View Post
    Trick the people into thinking they're enacting their own will and you have willing slaves.

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  8. #23
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    Quote Originally Posted by Scootertrash View Post
    I was told this by my machinist quite some time ago, he's been in business since '75, but he still requires the piston goes with the cylinder for boring and honing. I also verify clearances when I get the piston and cylinder back before I reassemble.
    Same here Scooter. Our guy wintt bore anything without piston and rings.
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  9. #24
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    Yup same with my guy. He won't bore sans slug.
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  10. #25
    barnett468 is offline FACT ! I have no edit button Arm chair racerThe day begins with 3WW
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    Quote Originally Posted by Scootertrash View Post
    I was told this by my machinist quite some time ago, he's been in business since '75, but he still requires the piston goes with the cylinder for boring and honing. I also verify clearances when I get the piston and cylinder back before I reassemble.
    Yup, I have done the same thing since 1975 but, I tell the machinist what clearance I want based on the bike or car engine and the app etc. I used to race 2 strokes (like my 74 Bultaco's) that had studs going thru the cylinder to the head, and these would be prone to seize in the 4 corners where the studs were in the blazing California heat if the factory clearances were used, so I had them bored with additional clearance and they stopped seizing. I also have some cylinders "plateau honed", depending on various factors.

  11. #26
    barnett468 is offline FACT ! I have no edit button Arm chair racerThe day begins with 3WW
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    Quote Originally Posted by Gabriel View Post
    bore 65.5mm

    Measured 2.5762-2.5765

    new Wiseco 2.576-2.5761 at it largest point.

    I just ordered a new a flex hone of appropriate size. I'm hoping to be able to get .002 or so worth of material out of there for proper clearance.
    Well, if it was mine, I would make the clearance at least .002". This obviously means that you need to remove .0018" which is around how much you planned to remove.

    I would then use a dedicated break in oil or non synthetic high ZDDP content oil (preferably with low detergents) for break in, then a good Group IV oil after that.

    .

  12. #27
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    Well ladies.....It WORKED. It took the better part of 45 minutes with a 180 grit flex hone. 900 RPM, 20 strokes at a time. Clean it, measure, liberal amounts of 30 weight oil and go again. What a frackin' mess I made!!!!!!!!! There's oil all over the place.
    Ohh well. I ended up with a total clearance of .0019 That's taking the largest part of the piston and the smallest reading I could get in the bore. The bore has a VERY slight taper. It's about .0006 larger at the bottom. Nope, don't care. She'll run.

    Conclusion:
    Is it the right way to do things? Emphatically NO!
    Can it be done. Yes.
    Why did I do it as opposed to getting it done professionally? I wanted a new hone anyway. These Flex-hones are the shizzz!!! I took my three stone traditional spring loaded contraption and tossed it under the lathe for down and dirty work. I'll never do another engine with one.

    *sigh*

    What's the next thing that'll bite me in the arse? Time will tell. Till next time, this is your friendly neighborhood halfassin' redneck, signing off.


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  13. #28
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    Removing material with a flex hone?

    I just like doing whatever I can on my own when I can, which is probably what you're doing. When you're ready to run Indy, then you can have it double-flare-square-bored-with taper swirl-plateu-hone-nika-poish or whatever the frig Barnett was talking about.
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  14. #29
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    Hones are just for making a crosshatch. If you use a drill on low speed and a quick in and out movement, you can get the desired degree of hatching.

    Just don't plan on taking off a bunch of material. If your hone does take off a bunch of material, it is too coarse and you'll need another hone to deglaze the surface.

    I like the ball hones myself with plenty of oil and a real good eye as well as repeatable motions.

    I watched a buddy have his "engine guy" hone his 1986 RM250 cylinder in a drill press!! He turned it on and went up and down slowly, All it did was it made circles in there parallel to each other, no degrees of separation between them (if that makes sense, I'm trying here).

    Definitely the wrong speeds, it's really easy when you get the speeds and motions down, maybe check YouTube??

    But, none of it is done "fast"...
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  15. #30
    barnett468 is offline FACT ! I have no edit button Arm chair racerThe day begins with 3WW
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    Quote Originally Posted by Gabriel View Post
    It took the better part of 45 minutes with a 180 grit flex hone. 900 RPM, 20 strokes at a time.
    Does this mean you will now have to use your opposite hand to do the stroking until the other one can recover?

    .

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