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Discussion Starter #1 (Edited)


What you get:
  • 20 mm compression valve w/ custom shim stack, optimized bleed port, and check valve assembly.
  • 20 mm rebound piston w/ custom shim stack and check valve assembly. Yes, you’ll actually have access to meaningful damping to eliminate the pogo-effect from the factory.
  • 8 degree rebound needle to provide better laminar flow characteristics through the rebound bleed and increased adjustability.
  • 5 wt. Fuchs Silkolene fork oil.
  • The only available drop-in replacement springs - from Sonic Springs. Of course, sized for your weight and riding style.
  • Installation (several options available).
Read more about the kit's performance here: http://www.yamahafz09.com/forum/10-fz-09-builds/412-stoltec-project-bike-gonna-long-thread-11.html#post15368

Purchase the kit here: 14+ FZ-09 Fork Piston Kit Service | Stoltec Moto
 

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Correct, thanks.
Noob alert, Does the full cartridge replacement work with what will be left of the stock forks? And the springs I've already replaced?
 

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Discussion Starter #7
The Fork Piston Kit (FPK) service reworks the stock forks, and yes, if you use the springs I carry, is fully compatible. The only instance where an incompatibility might arise is when using someone else's springs (read: longer or shorter springs); these cases would require a different spacer, which is easily workable.

The 25 mm kit, although not officially up for sale yet, will come with their own unique springs. The spring diameter and length is specific to that kit.
 

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he's offering two products/services - a revalve of the existing cartridge, and a full cartridge replacement. the caps with full adjusters are only available with the full cartridge replacement.
Ok thanks for clarifying. I was afraid that this was the case;) Time to start saving. BTW, if anyone is looking for an almost new set of Sonic .85 springs, they'll be up for sale as soon as Nick's 25mm kit comes up for sale.
 

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Nick, quick question: Can you explain whether or not this kit would be worth the extra expense over just springs + 10wt to your average street rider?

EDIT: Let's say someone were to replace the rear shock with the 8900E, and simply replace the fork springs and oil. How highly skilled would the rider have to be, and in what riding situations, would there be a noticeable difference/improvement for ponying up the extra bucks for one of the higher end Penske shocks, and the cartridge upgrade?
 

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Nick, quick question: Can you explain whether or not this kit would be worth the extra expense over just springs + 10wt to your average street rider?

EDIT: Let's say someone were to replace the rear shock with the 8900E, and simply replace the fork springs and oil. How highly skilled would the rider have to be, and in what riding situations, would there be a noticeable difference/improvement for ponying up the extra bucks for one of the higher end Penske shocks, and the cartridge upgrade?
In my experience you would love the improvement in comfort over bumps,alone.And the behaviour at speed would surprise you.
 

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Discussion Starter #13
Strictly in my opinion, this kit is fantastic. It provides ample damping without ever crossing the line into harshness. The feel that the front end delivers is very good - certainly on par with a top-shelf sportbike fork. The rub? It's still nonadjustable for compression. So, it's like finding a sweet spot/setting...and leaving it alone. In theory, you can adjust the shim stack to change the compression. But realistically, no one is going to do that. So, there are some compromises for changing road conditions, ambient temperatures, load, etc. over a fully adjustable setup.

The heavier fork springs and oil are a great budget solution for the bike, but the results are pretty vanilla when compared to the FPK or other performance fork work. The heavier oil allows the stock internals to develop more damping, but it comes at the expense of more high speed compression damping. On smooth roads, this is manageable. On roads riddled with frost heaves, cracks, or otherwise uneven surfaces, it can be a bit jarring (for my tastes and pace).

When a customer calls, I give the same spiel: The 8900E and heavier springs/oil 'fixes' the bike. It reduces the see-saw effect and eliminates the pogo'ing. Gaining the proper spring rate reduces dive/squat and allows the bike to work for the rider. Having tasted each iteration one at a time, this is what I'll call the bare minimum solution. At under $750, you get a sorted suspension that works.

The 8983 or 8987, and now the FPK, falls under the performance modification category. One ride back to back and it's clear that the money you spent went somewhere....and somewhere good.

But to (finally) answer your question, it really comes down your budget and expectations. IMO, yes, nearly all riders can appreciate the level of performance afforded by the FPK over a set of heavier springs and oil. It all comes down to wheel control and having the suspension work with you, not against you. Unless you're droning down a smooth highway, this kit's improvement is a noticeable, and welcome, improvement. You don't realize how little your wheel follows surface irregularities until you ride a properly set up suspension...the wheels follow the the road, and the end result is more traction and control. I mentioned this in the build thread, but I'll repeat it here for this audience. I was very pleasantly surprised with the performance of this kit. I went into it expecting to take it back apart and re-shim the high-speed. That simply wasn't the case - Barry @ GP did a great job on the stack. Knowing what I know, I shouldn't have doubted the results. But for the money, you can't go wrong.
 

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Discussion Starter #15

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The compression adjustment on the 25 mm adjusts what high, low or both?
 

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Discussion Starter #18
The compression adjustment on the 25 mm adjusts what high, low or both?
Low speed compression. High speed compression adjustment is only available on a select few forks.

And the 25mm kit isn't available yet? Do you know how much it will cost when it is available?
It's available, but not for sale yet. I won't officially offer it for sale until I install and ride it. Target is $1149.
 

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Hmm... I still may end up going with just springs + oil for now because, well, at the present time, it's all I can afford lol. I think I'd have to wait until next season to do anything more drastic than that, but it's good to know the option is out there. What is the spring rate of the stock springs?
 

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Discussion Starter #20
Hmm... I still may end up going with just springs + oil for now because, well, at the present time, it's all I can afford lol. I think I'd have to wait until next season to do anything more drastic than that, but it's good to know the option is out there. What is the spring rate of the stock springs?
When you're ready, let me know. The stock springs are 0.75 kg/mm.
 
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