This is a discussion on Andreani cartridge kit with compression fix within the Forks by Matt forums, part of the Vendors category; Seems I've been resting on my laurels by virtue of @TT_FZ's most excellent thread and @kevxtx's photos. It's past time I actually had an official ...
Seems I've been resting on my laurels by virtue of @TT_FZ's most excellent thread and @kevxtx's photos. It's past time I actually had an official thread on this since it's one of the most requested items on my service catalog.
The Andreani fork kit is the least expensive full replacement cartridge solution by a healthy margin (600) vs K-Tech IDS20 (900), Ohlins NIX-30 (1150). They go to some effort to stress that it's for "Race Track Use" and given the compression circuit performance there's no doubt about that. FWIW every one I've sold if it didn't go out modded, they have come back asking for the compression fix. People not on the 3 Yamaha-focused boards I'm on have tracked me down asking for a fix whether their bike is a KTM Duke 1290, various Triumphs, or any of the more pedestrian models. I've sent fix kits to UK, Philippines, Thailand, UK, Italy, Vietnam, Australia and New Zealand. So apparently this Google search thing works.
- 2-piston design
- Adjustable for preload, compression and rebound at the fork cap
- Springs suited to rider weight and usage profile
- Compression piston replaced with high-flow unit and custom re-shimmed for usage profile and improved bump compliance
- Proper top-out springs instead of fat o-ring
- Compression needle shortened and re-contoured for much wider adjustment range
- 3-piston setup adds a base valve to the 'R' leg which improves bump compliance even more
The bolded items are Forks-by-Matt's improvements on the original.
The factory suggests Ohlins R&T43 oil which is [email protected] which is ok for the rebound leg, but murder on the compression side unless all you do is ride at the track or in West Virginia. If you want to run the cartridges stock I suggest using a [email protected] oil in the comp leg. Fundamentally the compression circuit is too choked up to flow enough oil under high-shaft rates which translates to the harsh feeling. If I could just flip the piston over that would be very simple part of the fix - it's a nice piston just oriented the wrong way. I haven't tried to see if I could just use some metal epoxy to fill in the recess and remachine the surface flat. So I use my in-house piston.
Andreani specifies 120mm oil height but I recommend at least 150mm and more like 160-165 but this can be flavored to suit depending on how much suspension you're using at maximal stopping effort. Unlike the Yamaha forks, the Andreanis have no fluid-stop so you don't want to crash into the bottom. Even so it would take some serious doing to get that deep into the stroke let along do so in a manner where you could bend something.
The factory has also changed (late 2016?) to using an independent needle instead of it being integrated into the long shaft that goes to the cap. This was a most welcome change even though the taper is as before; very slight and at over 6mm long it will never retract all the way. This is perfectly fine for rebound duty but rather silly in the compression direction since the demands are different. The bleed orifice is only 2mm in any event so I shorten the needle so that you can actually back it out all the way - most people are going to run it close to wide-open anyway which if you had the original needle and recommended 4 turns of range means the orifice is still barely open. It gets better at 6 turns but what is needed is a different needle. See pic below.
Earlier on I shimmed the comp leg to have a very high degree of bypass which mostly neutered the needle. It also meant that slow-speed compression force was very modest. To add back some firmness and pitch stability, I added the 3rd valve assembly on the right leg very similar to what you would find in any decent 4-piston design of the last 30 years. Recently I came up with a 2-stage shim-stack and a tunable bleed on the Comp leg to increase the needle's authority. Yes, that's a carb main jet - very handy because they come in a slew of sizes.
Price Shipping (CONUS) DIY kit of sub-assemblies 100 8 installed into Andreani 615 35 replacement needle
Quick comparative analysis
The fit and finish of the Andreani since late 2016 has definitely improved. But when placed side by side with the IDS-20 or the NIX-30 you can tell there's a reason for the price.
Last edited by pattonme; 08-28-2017 at 06:56 AM.
Wnats the cost ofmthe andreani carts with the fix?
most of the time people buy the fully upgraded, drop in and go, solution. For overseas folks they tend to order just the assemblies.
You order by PM'ing me.
What is the price shipped to the UK out of interest? With your mods pre-fitted and without?
Starting to look at improving my bike
Hi pattonme, you mentioned in your first post that the fit and finish of the Andreani cartridge is not quite on par with the IDS or NIX cartridges. Is it that they will need servicing sooner when compared to more expensive cartridges?