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General Category => General Discussion => Topic started by: Dirk_S on June 24, 2025, 07:03:56 AM

Title: Source for new NTX fork internals?
Post by: Dirk_S on June 24, 2025, 07:03:56 AM: TL;DR—Where can I find replacement parts for NTX forks (not the Stelvio—the 350/650/750 small block from the late 80s-2001)?

I just came back from a 2,800 mile trip on my V7 III with the NTX forks and 21” wheel installed. The setup was great and reminded me of the KLR I rode in South America earlier this year. However, on the way home while passing through Connecticut and only 200 miles left to go, I began experiencing some bumpy turbulence. Then I began pogo’ing slightly at slower speeds. It wasn’t the road, as I was on a super slab in Interstate 84 that I know fairly well. Wasn’t tire pressure—tires were 35 psi when I left, and still in the 30s today. Front wheel looks as true as when I built it (not perfect, but appears to be within tolerance). No oil leaking from the dust caps.I loosened my fork brace and compressed the forks squarely to make sure they were aligned—but failed to loosen the other bolts and axle (I was in a rush).

So, I’m thinking some of the 30 year-old internals need to be replaced and all of it cleaned up.

The NTX 350, NTX 650, and NTX 750 (750-X / 750 XPA) all share pretty much the same internals, with the 750-X / XPA lasting the longest in production up to 2001. But where can I find new parts?
Title: Re: Source for new NTX fork internals?
Post by: guzzisteve on June 24, 2025, 07:59:14 AM: They are Marz M1R forks, any suspension expert in the business has parts, most likely no NOS stuff out there. There are folks who do this for a living, I would search them out.
Title: Re: Source for new NTX fork internals?
Post by: Dirk_S on June 24, 2025, 08:14:48 AM: Quote from: guzzisteve on June 24, 2025, 07:59:14 AM
They are Marz M1R forks, any suspension expert in the business has parts, most likely no NOS stuff out there. There are folks who do this for a living, I would search them out.

Are you sure they’re M1R forks? When I search that model number, these pics come up:

(https://i.ibb.co/8gVK3x1W/IMG-7713.jpg) (https://ibb.co/8gVK3x1W) (https://i.ibb.co/DHD5N6z4/IMG-7714.jpg) (https://ibb.co/DHD5N6z4)

But the NTX forks are a leading axle type:

(https://i.ibb.co/KphZz1mq/IMG-7715.jpg) (https://ibb.co/KphZz1mq)

Mine look more like the older (1982) L-style (minor differences in the sleeve casting for sure):

(https://i.ibb.co/sJCp8ZXq/IMG-7716.jpg) (https://ibb.co/sJCp8ZXq)
Title: Re: Source for new NTX fork internals?
Post by: Antietam Classic Cycle on June 24, 2025, 08:19:35 AM: You might check with Ugo Zanardi <ugo.zanardini@gmail.com> of Technomotors: https://www.suspensionzana.com/
Title: Re: Source for new NTX fork internals?
Post by: guzzisteve on June 24, 2025, 02:11:41 PM: There ya go, specialist.