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Found 5 results

  1. gmtech16450yz (motobark)

    Thanks Dave J- Smart Performance!!!

    Wow, it's been a few years since I've been on here. Glad to see old farts like greyracer are still on here helping guys out. I recently had an experience that I had to pass along though so I thought I'd log in here and see what's up. I was going through one of my favorite bikes, my "old" '06 YZ450. (I recently rode a couple '17 KTM's and it made me appreciate my YZ even more.) While I was freshening up the suspension, I thought I'd lower it a little bit in the process. I've always been happy with the suspension on that bike so I didn't want to go crazy with big changes, just a little tweaking. Anyway, I needed some shock oil and seals and I wanted to see if anyone local had any in stock. (Something that is getting harder and harder to do. For the local SF Bay Area people, we just lost Zoom Cycles, THE go-to parts and accessories store for the last 45 years.) I do a little google searching and find Dave Johnson of Smart Performance is local to me. I give him a call and sure enough, he has everything I would possibly need for any suspension work I wanted to do. He puts together an order and I drive over to pick it up. I'm greeted by an obviously VERY intelligent, articulate, helpful and nice guy. I show him what I'm doing and he gives me tons of ideas and suggestions. I leave with everything I would need to build the shock and fill it with oil and nitrogen myself. The next day I realize that having a guy that's done hundreds, if not thousands of shock rebuilds purge the oil of bubbles in a vacuum chamber he built just for that purpose would probably be better than me trying to do it myself. I asked him if he would vacuum and charge the shock and he said no problem, bring it down! When I went back to have him do the shock, I also brought my fork parts to ask him about lowering ideas. Again, he gave me a ton of excellent information and some upgrade parts to put into the forks in the process. I left with a filled and charged shock in my hand that I had 100% confidence in it being filled perfectly with all air purged properly. I then spent some time on my lathe making a couple spacers for lowering the forks. Just for the h#ll of it, I thought I'd send him some pictures of what I came up with. AGAIN, he gave me his invaluable input and suggestions and it pushed me to make another set of spacers that I could be absolutely positive would work perfectly and dependably. I'm generally a pretty independent thinker and worker. When somebody influences me to be BETTER than I think I can be or do, that impresses me A LOT. Dave's suggestions and thoughts "pushed" me to do a better job and come up with a better final solution. For that, I wanted to return the favor by letting everyone know my personal experience with Dave and Smart Performance. I know this won't come as a surprise to many here, but I just thought I'd share anyway. I'm a HUGE fan of smart people openly sharing knowledge, and Dave is absolutely one of those people. Thanks Dave! John (aka gmtech16450yz everywhere else on the web. Google search that or "john's sky redline".)
  2. So I ordered .47 fork springs and 11.5 rear spring for my xr600r from XR's only. And I bought the race tech suspension bible. So far I can't find any talk about what people have done for shim stacks or other fork mods. I have ideas about what I think I should do but why experiment if there is a known good starting point. I revalved my ranger about 10 years ago and I remember finding a lot of info online to help me with a starting point. I'm 6'2 230lb. The bike is plush now but bottoms bad when I get in the whoops and I blew out the bearing for the rear shock last ride. Any tips or tricks ? I'm not that great of a rider and no suspension expert but I'm pretty sure it can be set up better for me. I hoped the race tech "bible" would have some info in it but it seems like more of a sales tool for the gold valves...
  3. Cesar Molina

    Yz125 Suspension

    How do I make my suspensions softer on my stock yz125 mx bike for an enduro coming up. Do I just mess around with like the clicks. They are labeled as an H and and S on the forks. i weight like around 155lbs. Thanks
  4. Hi Is it anybody who know the stock shock valving on a old vintage Honda cr 500-1990?
  5. I'm a long time reader and member (member since May 9, 2009) and this is my first question. I want to change the valving of my 2016 Yamaha YZ250F shock absorber. My main goal is to speed up the rebound. My rebound clicker is almost all the way out, and it feels like the high speed rebound damping is not what I like. As a reference (to get an idea about the stiffness) I use the document on the website http://www.racetech.com/download/DS-504440-01.pdf and compare the stock valving of my shock absorber with the valving charts on the Race Tech website. I realize the valving charts are for the gold valve, but I’m sure it gives me some Idea about the stiffness of my stock stack. The low speed rebound of my shock is: (5) .20x40 .11x25 This is near the Race Tech rL102605 (5).20x40 .10x26 Link to the low speed rebound valving chart https://www.dropbox.com/s/1u6txpl2hei2mzp/low-speed-rebound-valving.jpg?dl=0 The high speed rebound of my shock: .30x40 .30x38 .30x36 .30x34 .30x32 (2).25x30 (2).25x28 .30x26 This is exactly the same as Race Tech rH168. Link to the high speed rebound valving chart https://www.dropbox.com/s/fzvsau59m63vhue/high-speed-rebound-valving.jpg?dl=0 My questions: Is my comparison of the low speed and high speed rebound valving correct? Can you tell me what shim stacks from the Race Tech valving chart match my stock compression valving? The low speed compression of my shock: (12).20x44 .15x37 What Race Tech low speed compression shim stack matches my stock shim stack the most? Link to the low speed compression valving chart https://www.dropbox.com/s/lfvrenhcpxwh7eh/low-speed-compression-valving.jpg?dl=0 The high speed compression of my shock: .20x42 .20x40 .20x38 .20x36 .20x34 .20x32 .20x30 .20x28 .20x27 .20x26 .30x25 What Race Tech high speed compression shim stack matches my stock shim stack the most? Link to the high speed compression valving chart https://www.dropbox.com/s/dkxc1p0zu3q55gj/high-speed-compression-valving.jpg?dl=0 Thank you very much for your help!
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