Author Topic: M1R parts & modification/Service  (Read 2120 times)

Offline Laverdalothar

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M1R parts & modification/Service
« on: February 22, 2018, 20:09 »
For those 1000 SFC owners that are not 100% satisfied with the M1R, I have a good hint...

Many - just as mine - of the Laverda M1R had only one slider bush at the top of the Fork slider. Some had one more at the lower part of the stanchion.

I always wondered why my fork was so bad - until I dismounted it... mud everywhere, especially in the compression damping unit. BTW: if you take the M1R appart, there is a big alloy part sitting at the lower end of the right side fork slider (the one where the adjustable compression valve sits on). You can push that out to clean it and everything below by using a piece of round material which you use to push this round thing up from the bottom side of the fork slider.

Anyway: what I wanted to report about: there is hope regarding the slider bushes. BMW offers fitting ones from the K1100LT from early 90's ( 1991 - 1994 I think). Examples are here:

https://www.bmwbayer.de/de/Fuehrungsbuchse-Standrohr-BMW-K4V-Modelle
 
https://www.bmwbayer.de/de/Fuehrungsbuchse-Tauchrohr-BMW-K4V-Modelle-31422310347-


you can buy them from your local BMW shop. Sure they cost a bit but be sure, you will recognize the difference...

If you need the manual for the M1R, I can send you a link to it, no problem.  ;)

However, the most critical part of the M1R Fork service is to get the Oil-seals out.

DON'T USE THE UPPER SIDE OF THE FORK SLIDER TO LEAN YOUR SCREWDRIVER AGAINST AND TRY TO BREAK THE SEAL OUT!!!

All you will break out is a part of the upper fork slider! Excactly what the DPO of my bike did...  >:D Cost me 250 to fix it... So - please dont! Use an according puller or any other method, but not the screwdriver against the sidewall of the fork slider method, please!
« Last Edit: February 22, 2018, 20:15 by Laverdalothar »
750 SF(0) 1971 #9934 *sold*
1000 SFC Classic 1989 #3367 *sold*
1000 SFC 1985 #2934 currently under restoration
1000 SFC Preproduction bike 1985 #0001 *sold*
1200 Jota 1981 #7474
750 S-Formula 2000 #1602
1000 Motoplast - currently under construction

Offline helicopterjim

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Re: M1R parts & modification/Service
« Reply #1 on: February 22, 2018, 20:48 »
74 SFC
72 SF
74 3C
75 3C
79 (81) Formula Mirage 1200
Various Ducati's, Guzzi's, Puch's ... a BSA Sloper and maybe even an R90
I don't have a 1977 Honda XL 175 but I do have a Chang Jiang CJ750 with a sidecar.

Lone Butte, British Columbia

Offline Laverdalothar

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Re: M1R parts & modification/Service
« Reply #2 on: February 23, 2018, 08:37 »
hi jim,

interesting kit, but considering all the other parts and the work involved, I can get the whole fork reworked and turned internally to compression, rebound and preload adjustment locally here for roughly 950 (850 for turning it into a cartridge system, another roughly 100 for the above mentioned slider bushes). See:

https://translate.google.de/translate?sl=auto&tl=en&js=y&prev=_t&hl=de&ie=UTF-8&u=http%3A%2F%2Fwww.hh-racetech.de%2FHH-Race-Tech-Gabelkit-4%2F&edit-text=&act=url

you could also try to source these: http://www.andreanigroup.com/products/motorcycle/105%7CG05/?Andreani+Adjustable+Cartridge+Kit+for+Moto+Guzzi+Daytona+1000+%28Marzocchi+41%2C7+mm%29+

you might need to adjust the length a bit to fit to the 1000 SFC though...
750 SF(0) 1971 #9934 *sold*
1000 SFC Classic 1989 #3367 *sold*
1000 SFC 1985 #2934 currently under restoration
1000 SFC Preproduction bike 1985 #0001 *sold*
1200 Jota 1981 #7474
750 S-Formula 2000 #1602
1000 Motoplast - currently under construction

Offline helicopterjim

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Re: M1R parts & modification/Service
« Reply #3 on: February 25, 2018, 07:35 »
I think the full cartridge conversion is best ........ thank you for the information!

Jim
74 SFC
72 SF
74 3C
75 3C
79 (81) Formula Mirage 1200
Various Ducati's, Guzzi's, Puch's ... a BSA Sloper and maybe even an R90
I don't have a 1977 Honda XL 175 but I do have a Chang Jiang CJ750 with a sidecar.

Lone Butte, British Columbia

Offline Laverdalothar

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Re: M1R parts & modification/Service
« Reply #4 on: February 25, 2018, 11:38 »
sure. But while you are at it, make sure you also use the slider bushes from BMW. They are much better than the plastic ones from Laverda/Marzocchi...

I haven't found them yet, but if there are these low friction SKF green fork seals available in the size fitting to the M1R, I would try them.
750 SF(0) 1971 #9934 *sold*
1000 SFC Classic 1989 #3367 *sold*
1000 SFC 1985 #2934 currently under restoration
1000 SFC Preproduction bike 1985 #0001 *sold*
1200 Jota 1981 #7474
750 S-Formula 2000 #1602
1000 Motoplast - currently under construction

Offline helicopterjim

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  • Posts: 2253
  • No shit, there I was - and the crack was 90!
Re: M1R parts & modification/Service
« Reply #5 on: February 25, 2018, 16:28 »
sure. But while you are at it, make sure you also use the slider bushes from BMW. They are much better than the plastic ones from Laverda/Marzocchi...

I haven't found them yet, but if there are these low friction SKF green fork seals available in the size fitting to the M1R, I would try them.

I have some green fork seals ......... I'll have to look and see who makes them.
74 SFC
72 SF
74 3C
75 3C
79 (81) Formula Mirage 1200
Various Ducati's, Guzzi's, Puch's ... a BSA Sloper and maybe even an R90
I don't have a 1977 Honda XL 175 but I do have a Chang Jiang CJ750 with a sidecar.

Lone Butte, British Columbia

Online Vince

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Re: M1R parts & modification/Service
« Reply #6 on: February 25, 2018, 20:31 »
There, as usual, doesn't appear to be any for 41mm M1R but other kits might fit.
http://www.jwtimports.com.au/downloads/SKF-Fork-Seal-Measuring-Guide.pdf

Offline Laverdalothar

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Re: M1R parts & modification/Service
« Reply #7 on: February 26, 2018, 08:15 »
unfortunately it is not in there...

the size is  41,7 X 55 X 7,5

41mm inner diameter wouldn't be that bad, but almost 1mm less outer diameter means the seal might move and not be oil-tight...
750 SF(0) 1971 #9934 *sold*
1000 SFC Classic 1989 #3367 *sold*
1000 SFC 1985 #2934 currently under restoration
1000 SFC Preproduction bike 1985 #0001 *sold*
1200 Jota 1981 #7474
750 S-Formula 2000 #1602
1000 Motoplast - currently under construction