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Thread: New Forks Setup for Moto Guzzi 1000 SP

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    Default New Forks Setup for Moto Guzzi 1000 SP


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    Hi all,

    I have in the garage a Moto Guzzi 1000 SP that I very much like, and that I am pampering a bit at a time (electronic ignition, respray). Next project will be the suspensions. I aim at getting pretty much the best in road holding and comfort that 2019 can give me, whilst keeping the wonderful sound and character of the 1984 carburetor engine.

    I would love to know what possibilities would be available, from simply changing springs and oil to, in case, having a new set of forks of bigger diameter as the 35mm now present are certainly obsolete if compared to what is available today.

    If I decide to go full hog and install new forks, will a new homologation be necessary, and would that be reasonably feasible or a costly nightmare?

    To give you an idea: I also rode a Moto Guzzi V11 LM with a 43mm Marzocchi fork. That is by far the best fork I have ever had, so I would try to match that as far as practicable. It does not have to be Marzocchi of course.

    Again, I am thankful for indications about possibilities and costs. I would like not to spend in excess of 2000 but I am open to spending more if this is necessary for the result I want.

    Thanks

    O

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  3. #2
    Should Get Out More Julian_Boolean's Avatar
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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    Set of RWU Ohlins and get a set of Yokes made, that should take care of your 2K quite nicely.

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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    Thanks Julian, that is certainly an alternative as they seem made extra for the "classic" bikes.
    Do you (or anybody else) know whether this would require a new homologation as one would be changing the 35mm forks with 43mm ones?
    Thanks
    O

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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    Not in the UK.

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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    Your usual problem on older bikes is finding forks which are long enough. If you already have a fork in mind which works well and is from a new but somewhat similar bike, maybe you can test fit it then get one and make it fit your older model?

    This is a good place to start although it will only compare bearings diameters, not steering stem length or fork leg length.
    https://www.allballsracing.com/forkconversion

    A common trick is removing the steering stem off your old yoke, and pressing or welding it into the new lower yoke.

    What have other 1000sp owners done? You can't be the first who wanted to update that model. Or one with the same or similar frame

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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    Thanks a_morti, that link is beautiful and it actually has my motorbike, listing a lot of potential alternatives, some from Moto Guzzi themselves! So I have alternatives to Ohlins RWU if I want to.

    I have been looking around a lot for 1000 SP conversion, but the issue is that many 1000 SPs are/have been converted to "specials" and there is seldom information as to what was done, beside the fact that some of these bikes do not seem built with a view to ride quality but more for the show effect.

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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    Don't get too carried away with the link- lot of people choose a front end using it, then it turns up and the forks are 4" shorter because the modern bike has a diamond frame with a lower steering neck. Or the steering stem is too short as they just were longer on older bikes. Post here makes the point:
    http://www.cbxclub.com/forum/viewtopic.php?f=102&t=8510

    But it's a start.

    Mille rsv1000 seem to have quite long fork legs for upside down, if that helps. Don't have measurements I'm afraid. Also off-road style bikes like multistradas will have longer forks. Everything can be revalved and resprung by a suspension specialist if required.

    Also look at any bike with clip on bars above the yoke as having potentially long enough forks. Cbr600f4 being one of the best forks I can think of with this configuration.

    You should also consider yoke offset. This can apparently have quite a pronounced effect on handling of a bike.

    Another resource:
    https://litetek.co/Guide_USD_ForkDatabase.html

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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    The longest 43mm forks I know of are VMax forks, but these are a bit long, R6 forks might be long enough if you fit them flush with the top yoke.
    My 1982 Z1170 has 1989 FZR1000 EXUP 43mm forks, they're about 50mm shorter than the original 38mm forks, it handles a bit tippy and lacks ground clearance, a 17" front wheel doesn't help, but because of the lack of fork offset it is very stable.

    TBH if I started again I'd stick with the standard forks and get the internals rebuilt, and I may go to this set up in the future.

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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    As JB says above, keep the standard external bits and just put new intenals in. I have a Le Mans, the oil in the forks is only for lubrication. The damping is done by cartridge dampers. New standard ones a about 50 a pair up to about 220 for FAC ones plus some progressive fork springs for 115 (Gutsibits) and another 200 on top of the range Hagon rear shocks (like I have) and your sorted for less than 500. Throw all that on and I doubt you'll need all the other bollocks and no need to change yokes, stems and wheels. Spend the rest on tyres and petrol.
    Its an SP, your not going to be trying to outbrake a BMW S1000RR into a corner

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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    Thanks all, food for thoughts!
    O

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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    If you're going to fit new rear shocks, have a look at YSS, the higher spec ones are very good value and quality

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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    Quote Originally Posted by Julian_Boolean View Post
    If you're going to fit new rear shocks, have a look at YSS, the higher spec ones are very good value and quality
    Thanks Julian.

    Would you say that YSS, as a company, lives in a higher quality sphere than Hagon? How distant they are from the Nitron and Ohlins of the world? I know YSS are excellent value for money, but just to gauge against what I know...

    Thanks

    O

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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    I've used one on an msx125. The bushings were toss (really bad design and materials) and failed in a few weeks. The shock itself seemed decent until it pissed the bed due to the failed bushings overworking the seals.

    Higher end shocks from them may have better bushings, they may have changed the design, etc. But be wary of the bushings if it has two top hat spacers one from either side as on mine they didn't meet in the middle so the cheap rubber bushing failed very quickly.

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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    My YSS monoshock cost 300, it's been on the bike for about 2000 miles, but it only gets used in dry weather, it's absolutely fine, construction is good, better than Hagons that I've had, damping is good, andvthe spring feels right.

    Riding wise it feels like a good quality OEM shock, but it doesn't have the feel of a high end shock (or the price)

    My experience of Hagons wasn't good, they felt under sprung and underdamped, this was after I told them my weight when I ordered. When I ordered the YSS I again gave my weight and it is spot on for me.

    Short answer YSS better than Hagon but not as good as high end shocks like Nitron, White Power or Ohlins

    With shocks I do think you get what you pay for.
    I also know of people who've bought the very cheap RFY shocks, had them rebuilt to suit them and been very pleased with the result.




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    Default Re: New Forks Setup for Moto Guzzi 1000 SP

    Fazer 1000 are 43mm forks. Loads around as most people junk them for usds
    Important to get the geometry right if you are messing about.
    Changed a z1000 about years ago. Handled like a truck for a while.

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