Yamaha R1 forks, one piece welded Honda stem etc... More conversion questions.

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Yamaha R1 forks, one piece welded Honda stem etc... More conversion questions.

surfish95747
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1980 cb750k
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Re: Yamaha R1 forks, one piece welded Honda stem etc... More conversion questions.

TOOLS1
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You have to grind off the weld, then press the stem out.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Re: Yamaha R1 forks, one piece welded Honda stem etc... More conversion questions.

surfish95747
Ah, so does that bottom bearing come off once the stem is pressed out?
1980 cb750k
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Re: Yamaha R1 forks, one piece welded Honda stem etc... More conversion questions.

TOOLS1
Administrator
No, That bottom bearing just comes off. You just drive it off with a hammer and punch. I am really not trying to be mean, rude, or disrespectful here, but are you sure you want to be taking on such an involved project like this? This is not something for a novice to be doing, it involves special tools, and skill sets to accomplish this swap, and it be safe. It seems like you might want to educate yourself on mechanics with a less involved project first. Then once you have a better understanding of mechanics move on to more involved modifications like the fork swap.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Re: Yamaha R1 forks, one piece welded Honda stem etc... More conversion questions.

shinyribs
Administrator
I' don't know how far along you are now, so I'll just do a recap of how to deal a stem

-Grind weld off the bottom/ turn it off on the lathe
- Remove bottom steer bearing or let or it slip of when you press ( removing it now saves a great deal of pressure needle up be applied when you press
- Press against a top nut. Pressing directly against the stem will destroy your threads, no question about it
- Heat, then press. If you must reuse the bottom bearing clean it with brake cleaner to degrease it before heating or you'll have a nasty mess. Don't overheat, then let it cool naturally to protect the temper.

How do you plan to fit it to your new bottom yoke? A small difference can be made up by building up the stem with weld then machining it down. Or you can make a reducing spacer of you need a very large distance made up or you need to lenghten is reach.

Before pressing out note the amount of bottom bearing register is exposed, you'll need to duplicate that later.


Screw it, you know what? I'm gonna document this and make a video. I'll be back in a few days.

I'll do a GSXR yoke and an early CBR yoke. To demonstrate both, but also to show why some yokes are just better suited to certain bikes, regardless of style.