Author Topic: Lafranconi crossover o-ring  (Read 144 times)

Offline wicks

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Lafranconi crossover o-ring
« on: July 01, 2022, 02:22:31 PM »
Any tips on how to get a very stubborn crossover through/into the o-ring on these Lafranconis without the o-ring displacing?  Want to try using a smaller o-ring but not sure how temp resistant the o-ring assortment I have is.

Trying with full body weight and plenty of grease on the oring and crossover pipe. Just got a set for the LM1 and had to grind down the mount tabs about 6mm off the leading edge to clear the (welded in place) factory rear footpegs.

Seems like they started up production on these again without testing and things are a bit off.
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'77 LM1 / '93 1000s / '73 V7 Sport / '06 Ducati Paul Smart  / '73 Porsche 911s / '94 Porsche 964 Turbo / '94 Defender 90

Offline Stevex

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Re: Lafranconi crossover o-ring
« Reply #1 on: July 01, 2022, 02:46:15 PM »
From experience those seals don't last very long, o rings and excessive heat don't mix.
I used some exhaust putty at the mating surfaces and then wrapped the joint with exhaust tape.
Wet the tape and it will make it more supple prior to application.
Secure the tape with stainless locking wire.

Steve
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Offline guzzista

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Re: Lafranconi crossover o-ring
« Reply #2 on: July 01, 2022, 03:56:34 PM »
I made some metal rings from copper rod ( thinner than O rings) , then sealed with this and let it set overnight . No leaks and it lasted for some years.

https://www.amazon.com/J-B-Weld-37901-Temperature-Resistant/dp/B01IBOBY74/ref=asc_df_B01IBOBY74/?tag=hyprod-20&linkCode=df0&h
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Re: Lafranconi crossover o-ring
« Reply #3 on: July 01, 2022, 04:03:18 PM »
I just ditched those rubber gaskets and used a pair of regular muffler clamps.
1968 Norton Fastback
1976 Lemans
1981 CX-100
1993 1000S
1997 Daytona RS
2007 Red Norge

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Re: Lafranconi crossover o-ring
« Reply #3 on: July 01, 2022, 04:03:18 PM »

Offline wicks

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Re: Lafranconi crossover o-ring
« Reply #4 on: July 02, 2022, 01:16:04 PM »
Ah I see, another issue with these, shucks. Well I ended up trimming the inside of the o-rings with just a shave off - and got them installed.

Now though, I seem to need rear-sets. Which I never really thought I would want to do on any of my Tonti bikes. Anyone have tips on how to get the levers lower? Do I need to bend the stock levers or are there some other ideas out there?
« Last Edit: July 02, 2022, 01:43:31 PM by wicks »
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'77 LM1 / '93 1000s / '73 V7 Sport / '06 Ducati Paul Smart  / '73 Porsche 911s / '94 Porsche 964 Turbo / '94 Defender 90

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Re: Lafranconi crossover o-ring
« Reply #5 on: July 02, 2022, 01:31:05 PM »
Ah I see, another issue with these, shucks. Well I ended up trimming the inside of the o-rings with just a shave off - and got them installed.

Not though, I seem to need rear-sets. Which I never really thought I would want to do on any of my Tonti bikes. Anyone have tips on how to get the levers lower? Do I need to bend the stock levers or are there some other ideas out there?

I found that once you got the rubbers in place they were OK for awhile but not a fix which is why I just went with the standard muffler clamps.  Some people have bent the levers or went with later levers that seem to work OK.  The shifter on mine works fine but the brake sits higher up than I'd like so I may just install the ones from my CX as I have Agostini rearsets on that bike.
1968 Norton Fastback
1976 Lemans
1981 CX-100
1993 1000S
1997 Daytona RS
2007 Red Norge

Offline wicks

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Re: Lafranconi crossover o-ring
« Reply #6 on: July 02, 2022, 01:44:49 PM »
If I found a pair of CX levers that would be a good fix? Don't know the difference there, never had a CX...
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'77 LM1 / '93 1000s / '73 V7 Sport / '06 Ducati Paul Smart  / '73 Porsche 911s / '94 Porsche 964 Turbo / '94 Defender 90

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Re: Lafranconi crossover o-ring
« Reply #7 on: July 02, 2022, 02:03:15 PM »
If I found a pair of CX levers that would be a good fix? Don't know the difference there, never had a CX...

I brought the same question up a couple of months back and that is what someone else mentioned and or bend the ones you have which I'm reluctant to do for obvious reasons.  I just haven't gotten around to doing the swap but when I eye it up it looks like it will clear.
1968 Norton Fastback
1976 Lemans
1981 CX-100
1993 1000S
1997 Daytona RS
2007 Red Norge

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Re: Lafranconi crossover o-ring
« Reply #8 on: July 02, 2022, 02:46:44 PM »
Looks like the CX pedal should work. I'll need to get both pedals chromed if they do work.

1968 Norton Fastback
1976 Lemans
1981 CX-100
1993 1000S
1997 Daytona RS
2007 Red Norge

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