Author Topic: EMGO fork tubes, early style problems?  (Read 1673 times)

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Offline mcswny

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EMGO fork tubes, early style problems?
« on: April 09, 2014, 04:59:36 PM »
Has anyone had a hard time getting the fork pistons on the bottom if EMGO fork tubes (early year models)? It feels like the tube is a fraction of a mm wide or something...
1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline mcswny

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Re: EMGO fork tubes, early style problems?
« Reply #1 on: April 09, 2014, 05:50:54 PM »
It seems to be about .14mm too wide and now I have my f'in piston stuck and it won't budge
1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline 754

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Re: EMGO fork tubes, early style problems?
« Reply #2 on: April 09, 2014, 08:40:20 PM »
Emgo makes fork tubes?  How much..
 Tap it off carefully with a wooden or aluminum drift, then polish off some plating.
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline mcswny

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Re: EMGO fork tubes, early style problems?
« Reply #3 on: April 09, 2014, 09:15:23 PM »
Yeah, they were like $120.

But so far wouldn't recommend. F in night mare trying to get the piston on. Any recommended way to polish off some plating?
1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline 754

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Re: EMGO fork tubes, early style problems?
« Reply #4 on: April 09, 2014, 09:24:16 PM »
Hold tube in a vise with padding, then use emery with shoe shining motion..work around it.
 ( unless you have a lathe to use)
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline mcswny

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Re: EMGO fork tubes, early style problems?
« Reply #5 on: April 09, 2014, 09:59:20 PM »
Awesome thanks frank. I got one done, will have to finish the other tomorrow


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1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline mcswny

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Re: EMGO fork tubes, early style problems?
« Reply #6 on: April 10, 2014, 11:18:09 AM »
So now that I have access to a computer I was able to do a more comprehensive search and found this post if anyone is interested. It can be hard to do full searches on a phone with greasy hands.

Looks like its a thing and all you have to do is hone the piston or as Frank suggested sand down the tube a little.

http://forums.sohc4.net/index.php?topic=112791.0
1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline 754

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Re: EMGO fork tubes, early style problems?
« Reply #7 on: April 10, 2014, 03:40:17 PM »
They are chrome all the way up and stock length, is that correct?
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline mcswny

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Re: EMGO fork tubes, early style problems?
« Reply #8 on: April 10, 2014, 05:39:18 PM »

They are chrome all the way up and stock length, is that correct?

Yeah.


Still struggling with this second one. Using a brake cylinder hone on the piston and for the life of me can't get it on. Can't figure out if it's just a bad repop fork tube or my fork tube piston is bad.

Maybe just take the piston to a machine shop and have them bore like .15mm out of it?
1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline mcswny

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Re: EMGO fork tubes, early style problems?
« Reply #9 on: April 10, 2014, 08:55:41 PM »
Yup, still won't fit. Going to have to find a machine shop to grind down the tube or bore out the piston
1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80

Offline mcswny

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Re: EMGO fork tubes, early style problems?
« Reply #10 on: April 11, 2014, 06:27:32 AM »
So I've tried using emery paper on the new tubes, emery on the inside of the piston as well as a cylinder hone on the inside of the piston (for a long time).

Should I get the piston bored out like .15mm? And I that's the case does anyone know a machine shop that would do that in the NYC area? Or someone here have access to the tools!

Thanks.
1972 CB750 K2
1997 XR600r (street legal)
1975 XL250
198 XR80