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Like everyone else, I don't like the forks on my '16 KX450. I was looking at installing some Gold Valves in it, but I haven't seen anything about if they are worth the money on this fork. Has anybody used them with this bike?
*realized I didn't answer original question!
As for Gold Valve, I've not seen any pro's or con's, either
SKF glide kit and seals does help the fork
The Shop
Send them to Enzo. Guy is a legend and does stuff even for riders sponsored by other suspension companies.
OP - If you want to provide a bit of info about what you're experiencing, I can probably help point you in the right direction. It may be proper air pressures/sag/rear spring if needed are able to help. It may be valving or it may be that spring conversion is best for you or all the above.
Feel free to use my email or post back here.
Just as an FYI, this fork is the air fork that I hear the most complaints about and the one we sell the most spring conversion kits for. We do have a lot of riders happy with the fork with just a revalve and others who have just never been able to adapt to the air fork feel and needed the spring conversion to gel with it.
The next thing I am going to try in the spring is adding 5ml of oil and going 175 16 195. The app shows that I should have more bottoming resistance and I'm hoping the lower pressures help with plushness. If you have any ideas or suggestions I'm all ears.
I have done the basic rag tech course and read their book, but I don't know what shims or thickness I have to change, can you tell me something?
Use the link in my signature to get some recommended pressure settings from the spring rate calculator or even send me an email chris@racetech.com and I'll get you setup with Tech support for their "live" recommendation.
I first went with just the gold valves and racetech's recommended valving for my skill level, along with a standard rebuild with standard bushings and seals, racetech fluid, etc. The forks performed a heck of a lot better. Even with just the valving and their recommended pressure settings (180/10/190), the initial part of the stroke felt more plush, and the action throughout the stroke felt firm yet predictable, and bottoming is now a thing of the past. I instantly felt a boost of confidence and was able to push harder. I then got to the point where i was chasing front end traction again because i was now charging into corners harder.
I then got the forks rebuilt again but this time had the SKF glide kit installed and kept the same Racetech valving setup i had before, along with the same oil levels. The SKF glide kit definitely improves the initial part of the stroke and allows the front end to track the ground better. Honestly, not quite as good as a SKF glide kit equipped spring fork, but the advantage with the air fork is the awesome mid to deep stroke performance (bottoming resistance). These forks LOVE to be pushed hard and reward you for pounding on them... at least mine do.
Also, i had a chance to test out Ohlins forks on my bike for a short time and I have to say, the SFF TAC with SKF glide kit and RaceTech Gold Valves performed as well, if not better, than the Ohlins RXF48 in my opinion.
As far as what to address, I'll go through the things you mentioned and some others:
The KX250f forks that you said you liked are actually not as good of a component as the SFF TAC fork with a spring conversion. While they both have a single spring, the 250f SFF fork is a 48mm fork and the 450 is a 49mm fork.
As far as your 09 450 forks, I'm just the marketing guy so I will have to double check this, but I believe 2008-2012 were the same forks. Alessi, Friese, McAdoo and some of the other guys who spent time on Kawis that we work with used 2012 forks with Race Tech setups and had great feedback. It's a very viable option, but they would still need setup for you. It also depends how much time you have on the forks and what condition they are in. The technology is definitely not bad.
When looking at your setup if you are going to stay air, you'll want to consider the following pieces:
Rebound Gold Valve - these are super important on the TAC fork because you are working to try and get initial plushness and traction and this is exactly what the Rebound Gold Valve is designed to provide. (some tuners call this the midvalve) This is becoming a more and more important tuning piece in modern suspension, it used to be many tuners would give you a "revalve" without ever touching the mid-valve...well quite a few still do, but that's not a good option on this bike especially.
Compression Gold Valve - This is going to be your hold up and bottoming resistance. Typically this is what is changed when you go to many tuners and ask for a "revalve". The extra hold up in the valving with the Gold Valve and RT setting will help lower your air pressures reducing stiction and the "air fork" feel.
Finally, if you are in New Jersey, I'd give Jason at SGB Racing a call. I know he's trackside a lot and I get a lot of great feedback from riders about him. He's the local Race Tech Center in that area. I know he just recently converted AJ Catanzaro over to a Race Tech Gold Valve setup from his previous tuner on a KX450 as well.
http://www.sgb-racing.com/
Hope that helps a bit!
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