Guzzi stornello 125 sport america 1965

[robert mcwilliams]

Am in great need of a set of steering head bearings or info on where to locate same or specs for the cones if possible, Thanks Robert

[Don West]

Hi Rob  

They are extremely hard to find.  I managed to get some from an old Zigolo that was beyond repair for one of my bikes that has been running some really badly pitted ones for a few years.  You could try Guzzi Retro to see if they can help.  The balls are easily available from any bicycle shop.  

Don  

On Saturday, 15 November 2025 at 20:05:16 GMT, robert mcwilliams <bobm...@gmail.com> wrote:

Am in great need of a set of steering head bearings or info on where to locate same or specs for the cones if possible, Thanks Robert

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[robert mcwilliams]

Thanks, anymore Zigs lying about, have tried Retro but no luck. Any old cups that can  be measured? Robert.

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[robert mcwilliams]

Hello, the bearing cups are the final items to finish the project, very frustrating. Robert.

[Don West]

Hi Robert  

Where abouts in the world are you?  

Harpers have the top and bottom cups in stock in America, but don't seem to have the cones (2 required)  part number 36515200.  The ball bearings are just standard 3/16th size and are available from any half decent bicycle shop. 

https://harpermoto.com/products/cup-24515000 

https://harpermoto.com/products/cup-24515100?_pos=1&_sid=153c54248&_ss=r  

Do you have an old set of bearings?  I have run my Stornello on quite badly pitted cups for a few years and it is not really noticeable when out on the road.  If you are in the UK, there is a place that claim to be able to make bearings, The Vintage Bearing Co in Burton on Trent.  http://www.vintagebearings.co.uk  

Regards 

Don West  

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[andrew schmid]

Hello. I’m relatively new to the group. I’ve owned and worked on a couple 1967 V7’sfor many years and recently acquired a 1950 Astore. As simple as it may sound changing of the oil is nothing like the V7’s and not much in the literature. Could someone give me a brief description of a simple oil change. Thank you. Al also, my oil dipstick reads different from the recommended volume of oil to use. I wonder which I should rely on? Thanks much, Andy Schmid.

Sent from my iPhone

On Nov 17, 2025, at 5:37 AM, 'Don West' via Guzzi Singles <guzzi-...@googlegroups.com> wrote:



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[jerry atric]

What size are the races, Robert? I have a set but not sure which model they are off. I'm in UK.

[robert mcwilliams]

Hello, have ordered a cup (as they only had one but better than none) so should be able to machine up another ( or get a more skilled person to do it for me) Thanks again. Robert. PS you really do not want to know of the bodge I resorted to so that She would pass rego !!!!!!!!!!

On Tue, Nov 18, 2025 at 5:49 AM robert mcwilliams <bobm...@gmail.com> wrote:

Hello, looks like great news as only need the cups so will get on the case. Am in Australia and Stornello 125 are very rare beasts out here in fact when I registered mine it was the first so everything had to be created from scratch ( from info I gave them!). Thanks again, Robert.

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[robert mcwilliams]

Hello, looks like great news as only need the cups so will get on the case. Am in Australia and Stornello 125 are very rare beasts out here in fact when I registered mine it was the first so everything had to be created from scratch ( from info I gave them!). Thanks again, Robert.

On Tue, Nov 18, 2025 at 4:59 AM jerry atric <baconsl...@gmail.com> wrote:

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[Rick Yamane]

Robert, Once you get the new one I would try matching it up at bicycle or motorcycle shops. You can probably get them from a bearing supply house too. I’ll bet real money they are a standard size.
I’d recommend getting real and new bearing parts too, if you plan on riding the bike. Steering heads are simple to service but to me, they are kind of a PIA and tend to get overlooked in the grand scheme of things. Better to do them once correctly and probably never need to worry about them again.
That said as others have offered, I probably have used ones. I have an old frame sitting in the yard……

Rick

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[robert mcwilliams]

Hello, things are looking up, still need one more cup but should be able to use the one from Harper as a template. Robert.

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[Don West]

Hi Robert  

The top and bottom cups are different depths, but that is not really critical.  You should be able to measure the depth of the recess in the top and bottom of the frame  

As you are probably aware, the steering stem is quite small compared to most bikes.  From memory it is approximately 3/4 of an inch or 18mm, you will be able to get that dimension off your stem.  You should see the machined section where the cones sit on the stem.  

Don  

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[Patrick Hayes]

On 11/17/25 05:46, andrew schmid wrote:
> Could someone give me a brief description of a simple oil change. Thank
> you. Al also, my oil dipstick reads different from the recommended
> volume of oil to use.

Andrew, I'm confused. Your Astore is nothing like a V7.
The Astore has a dry sump motor. While running, oil from the supply
tank is injected into and flung all around inside the crankcase. It
puddles at the bottom and is quickly pumped back up into the supply
tank. The oil pump has two parallel functions. One side pumps in oil
and the other side pumps out oil. Thus, there isn't ever any
significant sump puddle.

Dipstick???? The singles don't have a dipstick unless some previous
owner bodged up something. How about a picture for us?

Changing the oil is quit simple. I just use a small, clear hose to
siphon oil out of the tank via the filler neck. Helps to tip the bike
slightly to that side. If you really want to clean out the tank and the
oil filter, then you can pull the fittings from the other side of the
tank (but be careful with pressure on the banjo fittings).

2.5 quarts is probably fine. The level should appear overlapping the
bottom edge of the filler neck as you look in with a light.


--
Patrick Hayes
Fremont CA
Falcone-NT and SuperAlce
www.motohayes.com

[robert mcwilliams]

Hello, have two cones (upper and lower) and all the balls but cups or specs of same I do not. The part number for both cups is the same. Have ordered a cup from Harpermoto so hope it is correct. Am being somewhat selfish as trying to get all the bits before doing this final job as she is my only transport. Robert

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[robert mcwilliams]

Have upper and lower cones and all the balls but no cups or specs for same.  Harper could only supply one cup which I hope is the correct one. If you have an ojd one could you send measurements of same? ID, OD , height  etec thanks Robert.

[andrew schmid]

Thank you so much for the description. Much appreciated.
Sent from my iPhone

> On Nov 18, 2025, at 12:54 PM, 'Patrick Hayes' via Guzzi Singles <guzzi-...@googlegroups.com> wrote:

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[Don West]

Hi Robert  

The cups fit into the frame and the top and bottom cups do have different part numbers.  One is deeper than the other.  You should see that the recess in the top and bottom of the frame are of different depths.  The part numbers are 24515000 and 24515100.  Harpers website did say that they had both in stock, it is now saying that they have 2 of part number 2415000 left and no stock of 24515100.  Have another word with them about this item.  It might be just what you are needing.  

https://harpermoto.com/products/cup-24515000

The cones fit on the steering stem and are the same top and bottom.  

I will dig my set out later and do some measurements for you.  

Don  

https://groups.google.com/d/msgid/guzzi-singles/CAPGk2au5psqtHitjNkF_5fig6Qq2uQ-U6dRyVbcxVmGGpvsfig%40mail.gmail.com

.

[RICHARD YAMANE]

Robert,

I don’t know if you’ve seen this site but it’s a good collection of info on various makes and models. There is Stornello stuff here.

http://www.rpw.it/documentazione.htm

Rick Yamane
Importer of Vape/Powerdynamo ignition systems and Polisher of bikes at Motion Pro

To view this discussion visit https://groups.google.com/d/msgid/guzzi-singles/1042450662.13622120.1763544309456%40mail.yahoo.com.

[robert mcwilliams]

Don , thanks again for info and have ordered the cup. My parts book lists the cups as the same but the cones different so becoming a bit of a mystery, I bow to your greater knowledge as my bike came without any cups at all so as I may have mentioned the bodge to make her at least rideable is not worth thinking about. Robert.

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[robert mcwilliams]

Hello, thanks for the link, will check it out fully in a while. Robert.

[Don West]

Hi Rob  

Here are the pages from the parts list, see attached.  The 2 cones are both part 40 The cups are 42 and 43.  

You can get a copy of the parts book from my dropbox file here.  

https://www.dropbox.com/scl/fi/2thm0g89px2lwu47ew6f6/MGuzzi_Stornello_Sport-Scrambler_Parts_list.pdf?rlkey=2bwxhot6tmens80jd695rwa3b&st=gy7bp8sl&dl=0  

I will dig out some bearings to check the sizes for you tomorrow,  

Don  

https://groups.google.com/d/msgid/guzzi-singles/CAPGk2avsjGxjJQ13WRLY7v%2B8za9cXTU2zW0LOZSbVbA91fNp%3Dg%40mail.gmail.com

.

[robert mcwilliams]

Hello thanks and all that , my mistake, cups are different cones the same, will send back to Harpers the cup I don't need, Still need the other though. will sort out what I got and number for the other when the cup arrives. I have a parts book 2nd Edition and still managed to muck it up, old age etc etc. Robert.

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[Don West]

Hi Rob

I had a look at my set today and have attached some photos for you.  The lower bearing is the deeper one, you will see that the recess in the frame is deeper.  

I am getting slightly confused as to just which parts you are needing now and what you have got.  Please explain.  

Don  

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[robert mcwilliams]

Hello, have ordered a cup and when it arrives will know what the other one I need is. Confused? So am I most of the time. Robert.

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[robert mcwilliams]

Hello have been told that 24515000 cup upper is on its way so still need 24515100 cup lower or specs for same if possible, thanks Robert.

[robert mcwilliams]

Just checked out the pics and it looks as though the bottom is the same only deeper to the figure in the photo so should be able to have one made , I hope. Robert.

[Don West]

Hi Rob  

Yes the lower cup is pretty much identical the the upper one but has a 4mm longer section extending away from the bearing cup, so it would be a case of copying the one you get from Harpers, but making it a bit taller.   

It looks like you are close to getting it sorted.  

Don  

https://groups.google.com/d/msgid/guzzi-singles/CAPGk2avhXx_4w5UhyWGcw%3Di7iX-112_6JQHQ%2BZnjvPPnPeSKmQ%40mail.gmail.com

.

[RICHARD YAMANE]

It would make sense that the bottom cup is the deeper on since it bears the brunt of any deflection loads. That in mind it's probably better to run two bottom cups than two top cups.
Robert is talking about having one made but keep in mind it probably would need to be hardened and hard chromed.

Rick Yamane
Importer of Vape/Powerdynamo ignition systems and Polisher of bikes at Motion Pro

To view this discussion visit https://groups.google.com/d/msgid/guzzi-singles/1070201304.53189.1763756405889%40mail.yahoo.com.

[robert mcwilliams]

Don, am feeling quite smart as managed to photocopy the bearing pics that you sent which will be of assistance to getting them made, thanks again. PS am not real good at this computer stuff at all. Robert.

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[robert mcwilliams]

Don, have found a place that can do the work including hardening but very expensive but have no choice so just waiting for the upper cup to arrive to use as a partial template. Xmas could also hold things up but light at the end etc etc. Robert.

[robert mcwilliams]

Don, have you or anybody you know explored the possibility  of using taper roller bearings for the steering stem of Stornello 125's. Robert.

[leo volmer]

Hi all,

A couple of years ago I visited this group on a regular base, but I'm back now, and maybe of some help in this case. I have 2 cups an 1 cone from a Stornello 1972. I think they are the same size as the Sport. I switched to taper rolling bearings, so I don't need them anymore. You can have them at shipping costs. Can you show a picture or drawing with some sizes, in mm. BTW , they are in pretty good condition. I'll try to upload a pic here.

    regards,

    Leo Volmer

Op woensdag 3 december 2025 om 19:52:22 UTC+1 schreef robert mcwilliams:

[robert mcwilliams]

Hello, Leo am waiting on a cup (upper) to arrive from America and will then be able to send all the specs. Did not get your pics yet. Robert.

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[leo volmer]

I have my pics on a SD card, and my new PC needs an adaptor to connect with the SD card. Adaptor is ordered, but takes a while.

Op donderdag 4 december 2025 om 19:58:43 UTC+1 schreef robert mcwilliams:

[Don West]

Hi Leo  

I would be most interested in how you managed to convert a Stornello to taper rollers.  I have looked into it myself and couldn't see any simple way of doing it.  

Robert, I thought the cups and cones from a 1972 model were the same as your earlier model but the part numbers are different.  I'm not sure what the differences are?   If they will fit, then it would save you the expence of getting a lower bearing made.  

Don  

https://groups.google.com/d/msgid/guzzi-singles/243ab57d-ae20-420d-a8e5-5ead0f87e0c9n%40googlegroups.com

.

[RICHARD YAMANE]

I can't remember exactly what I did on my bike when I did my trials conversion. I did put a 32mm Ceriani from a Penton on itbut they used ball bearings anyway. I remember having to stack up some spacers though. 
I have an A series BSA and when I did a roller bearing conversion on that I bought a bearing kit that was ground down to fit. It's a common conversion though. The thing to do is to measure the steering head diameter and stem diameter and try to find bearings to fit. The SKF and FAG catalogues will become your best friends. Bearing cups and cones can be ground by a good machinist with a grinding attachment on his lathe, stems can be turned down, lengthened or shortened. You want to try to keep the distance between the upper and lower yokes the same otherwise it will affect the way any sheet metal like headlamp ears or shrouds fit.

Rick Yamane
Importer of Vape/Powerdynamo ignition systems and Polisher of bikes at Motion Pro

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[leo volmer]

I can't show an y pics yet, as I explained before . But in short : I took off the original cups and cones, and replaced them by home made adaptors , i, n which the tapered roller bearings fit. The problem is, that it will make the headstock longer, and the original front forks won't fit anymore. Instead I used the forks of a V 50.

Op donderdag 4 december 2025 om 20:45:29 UTC+1 schreef Don-Spada:

[RICHARD YAMANE]

Leo, Is your bike a 160?
I think that might be a breaking point for a lot of changes. The 160 I don't think made it to the US. I was hoping to find one when I was riding trials for a donor engine but never did.

Rick Yamane
Importer of Vape/Powerdynamo ignition systems and Polisher of bikes at Motion Pro

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[leo volmer]

It used to be a 1972 , 160 cc, 5 gear Stornello. I upgraded it to 175 cc, and put a compressor to it, with fuel injection. I'll try to post some pics.

Op donderdag 4 december 2025 om 23:22:31 UTC+1 schreef richa...@comcast.net:

[leo volmer]

These pics were taken before starting up : K&N airfilter is still wrapped up in plastic.

Op vrijdag 5 december 2025 om 10:08:48 UTC+1 schreef leo volmer:

[RICHARD YAMANE]

Wow!

Rick Yamane
Importer of Vape/Powerdynamo ignition systems and Polisher of bikes at Motion Pro

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[RICHARD YAMANE]

Not that I would build one but I'd like to hear a bit more about that. Looks like the blower is pushing through the injector throtle body. Where did you source the blower from? Must be pretty small for a 175cc without blowing the crank out the bottom! 

I was part of the Budfab Streamliner team and we still (I think) hold the 50, 100 and 125cc LSR world records. For the 50cc we ran an Aprillia with Metrakit top end and for the record had a turbocharger from a Smart Car.

Rick Yamane
Importer of Vape/Powerdynamo ignition systems and Polisher of bikes at Motion Pro

To view this discussion visit https://groups.google.com/d/msgid/guzzi-singles/57cfe3a4-5d9c-4e15-9796-b95bd95ec877n%40googlegroups.com.

[leo volmer]

The blower pushes air into the Plenum ( = Polmone or Tank), with a safety valve, then to the throttle body ( with the ECU included), into the inlet manifold, where the injector is situated. The compressor is a Swiss made vacuum pump, but turnt around. It's a pretty, little blower, small enough to fit in the Stornello frame, but big enough to bring the engine to life. It's a Busch pump. Fuel pump, filter and pressure regulator are in the gastank.

On you-tube you can find some videos with the Stornello. Have a look at : pauldaytona  , and enjoy.

Paul is a friend of mine, he did the digital part, I did the mechanical work. We made a couple of runs on a power tester, he brings 15,5 hp at the wheel, and we're not yet finished.

Op vrijdag 5 december 2025 om 18:15:59 UTC+1 schreef richa...@comcast.net: