Before I order some (I want spares on hand for an oddball thread fastener) can someone confirm that these are the M9 nuts/washers/gaskets?

M9x1.25 nut

https://www.suzukipartshouse.com/oemparts/a/suz/5e20716b87a866135c5d0bc8/cyli...

23 NUT 09159-09003 $5.09 quantity 3
24 NUT 09159-09004 $2.95 quantity 1
25 GASKET (10.2X20X2.3) 09168-10031 $2.95 quantity 3
26 GASKET (10.2X20X2.3) 09168-10031 $2.95 quantity 1

In the early 1970s Suzuki often had fastener sizes in the part number, so I'm thinking the "-09" starting the second part of the nut part indicates M9.  But since I will need to order the parts and pay shipping as well as a high price, I'd like to make sure I've got the correct parts.

I found reference to an M9 nut that is used on a variety of Italian scooters,

Vespa Input/Aux Shaft Nut Piaggio M9x1.25 (V6K-4940001)

but that is a plain nut and at least some of the Suzuki parts appear to be acorn nuts.

McMaster has some 12 point M9 flange nuts at $5.32 each

https://www.mcmaster.com/products/nuts/thread-pitch~1-25-mm/thread-size~m9/

but that doesn't seem to be a more economical choice.

There are plenty of bikes that manage to get by with either M8 or M10 threads on the cylinder studs, so I'm at a loss for why Suzuki had to go with an oddball size.  OEM prices seem to range up to $7-8/nut.

Are there any other non-standard fasteners on the engine that I need to be aware of?

When I needed m9x1.25 nuts to use as jam nuts to get the cylender studs out I ordered them from a Vespa dealer in Daytona Beach. They had to come from Italy, took 2 weeks. If I had to do it again Iwould just get a couple acorn nuts from Ron Aryes and cut the acorn off the worst looking one.

badwolf wrote on 06/05/24 at 05:11:15:



Yes, my plan is to try and ID all the weird stuff that has to come from Suzuki and make one order before I get stuck waiting for weeks for something to arrive that I need "right now".  So far the online Suzuki dealers seem to take at least 2 weeks before an ordered part shows up.

Those M9 nuts are only used on the Savage.  If all other Suzukis for the last 50 years can use M8/M10 cylinder nuts, why make them a special part for the 650?

Michael Moore wrote on 06/05/24 at 08:38:21:


That is because the online retailers don't really have the parts in stock at their location.  When you place an order for parts, they order them from their supplier.....and they ship them to you "after" they receive them.

The only online parts company I know of that actually has an inventory of parts is Rocky Mountain ATV.  When you place an order for multiple parts it is not unusual that you will get a shipment within a couple of days.  If the first shipment does not have everything - you will get another delivery with the rest that comes from their other store.  Sometimes you will get multiple shipments as the parts become available to them.  If they don't have all the parts in stock when you place your order - then they will order the rest and ship them like all the other online retailers do.  The cool thing is that if there is any problem with your order they will give you a telephone call.  Their prices may be a bit higher than some of the others - but their service is excellent!
https://www.rockymountainatvmc.com/oem-parts/Suzuki

Michael Moore wrote on 06/06/24 at 08:23:59:


Rocky Mountain is likely not to be the lowest prices - however you will get your parts the soonest for those parts they do have in stock.

Obscure pieces like the M9 cylinder head nuts are not something they keep in stock...and they show that shipping will occur in 7-10 days.  The parts list on their site shows what they have in stock, what parts will ship later, and what parts are no longer available.

If you need/want something quickly - then check Rocky Mountain to see if they have it in stock.  If they do it will likely arrive in just a few days.