Did I screw up these Honda C70 fork bushings?

nick2ny · 11-19-2012, 05:40 PM

Howdy--I'm nearly done refreshing the fork on my C70. I got a kit from DRATV kit, removed all the old parts, and put in the new parts. I pressed in the outer bushings and now the inner ones don't fit (I used a press, and they went straight in with a little force. It felt fine).

They would probably go in with pressure, but then the suspension wouldn't work very well.

Was I supposed to use heat on the suspension arms and get the interference fit to work with heat? I can't imagine I damaged them with the press, they went in really easily. The inner pieces also fit easily before I pressed the outer pieces in. Ugh.

The bike!

The suspension arms, still on the bike

That stupid press that I thought I was so lucky to find.

The old, worn bushings.

Success! (or so I thought)

It looks so easy. Look how loose the tolerances are.

The mess I'm in now.

CycleDoc59 · 11-20-2012, 05:37 AM

I expect the fit of the inner bushing within the outer is very close, so
as to not have play or looseness. You say the two fit together ok before
installation of the outer bushing..? Then perhaps the pressing procedure
upset the edge of the outer bushing a bit. It would take very little to do so.
So, look carefully at the outer bushing edges(s), and remove any imperfections....

nick2ny · 11-20-2012, 06:15 AM

Quote:

Originally Posted by CycleDoc59

I expect the fit of the inner bushing within the outer is very close, so
as to not have play or looseness. You say the two fit together ok before
installation of the outer bushing..? Then perhaps the pressing procedure
upset the edge of the outer bushing a bit. It would take very little to do so.
So, look carefully at the outer bushing edges(s), and remove any imperfections....

Thanks for the reply. Pressing didn't mess up the edges though. The rims of the outer bushings have a ~0.5mm chamfer, and it isn't deformed or damaged or nicked all the way around, either on the inside or outside edge of the chamfer.

It's like the outer bushings are either squished in 0.001", or are slightly ovalized.

Woe!

GreaseMonkey · 11-21-2012, 07:40 PM

If you are looking for a simple and cheap fix, just use a round file and lightly remove enough of the inside that you get your clearance. As long as you use your brain and your eyes you'll do fine.

Or else you can buy an adjustable reamer to get your clearance:

http://www1.mscdirect.com/eCommerce/...mers/_/N-77ha8

ttpete · 11-22-2012, 04:28 PM

Better yet, go to an automotive machine shop and have them hone the bushings on their Sunnen honing machine. Bring a pin so they can check the fit. It should only take a few minutes.

ragtoplvr · 11-22-2012, 04:38 PM

brake hone. They only cost a few dollars.

Rod

11-19-2012, 05:40 PM	#1
nick2ny ^OP Gnarly Adventurer Joined: Mar 2009 Oddometer: 489	Did I screw up these Honda C70 fork bushings? Howdy--I'm nearly done refreshing the fork on my C70. I got a kit from DRATV kit, removed all the old parts, and put in the new parts. I pressed in the outer bushings and now the inner ones don't fit (I used a press, and they went straight in with a little force. It felt fine). They would probably go in with pressure, but then the suspension wouldn't work very well. Was I supposed to use heat on the suspension arms and get the interference fit to work with heat? I can't imagine I damaged them with the press, they went in really easily. The inner pieces also fit easily before I pressed the outer pieces in. Ugh. The bike! The suspension arms, still on the bike That stupid press that I thought I was so lucky to find. The old, worn bushings. Success! (or so I thought) It looks so easy. Look how loose the tolerances are. The mess I'm in now. __________________ speed limit zero

11-22-2012, 04:28 PM	#5
ttpete Rectum Non Bustibus Joined: May 2009 Location: Dearborn, MI Oddometer: 3,649	Better yet, go to an automotive machine shop and have them hone the bushings on their Sunnen honing machine. Bring a pin so they can check the fit. It should only take a few minutes. __________________ 10 Ducati 1098 Streetfighter S - "Sleipnir" 09 Kaw Versys "The problem with Socialism is that you eventually run out of other people's money" _____ Margaret Thatcher

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11-20-2012, 05:37 AM	#2
CycleDoc59 Wrench Rider Joined: May 2006 Location: East Virginia Oddometer: 713	I expect the fit of the inner bushing within the outer is very close, so as to not have play or looseness. You say the two fit together ok before installation of the outer bushing..? Then perhaps the pressing procedure upset the edge of the outer bushing a bit. It would take very little to do so. So, look carefully at the outer bushing edges(s), and remove any imperfections....

11-21-2012, 07:40 PM	#4
GreaseMonkey Rhymes w/piecejunkie Joined: Jun 2006 Location: The only county in Illinois with no train tracks Oddometer: 4,842	If you are looking for a simple and cheap fix, just use a round file and lightly remove enough of the inside that you get your clearance. As long as you use your brain and your eyes you'll do fine. Or else you can buy an adjustable reamer to get your clearance: http://www1.mscdirect.com/eCommerce/...mers/_/N-77ha8

11-22-2012, 04:38 PM	#6
ragtoplvr Beastly Adventurer Joined: Oct 2007 Location: S. W. Mssouri Oddometer: 4,604	brake hone. They only cost a few dollars. Rod