ryan Posted August 4, 2018 Share Posted August 4, 2018 doing my valves at 23,xxx miles intakes all within spec exhaust are tight calculated out what i need i tried searching here, tried googling it, i do not want a kit as i only need 5 shims where can i buy individual shims? thanks Link to comment Share on other sites More sharing options...
koth442 Posted August 4, 2018 Share Posted August 4, 2018 Call local motorcycle shops and ask if they'll trade you. I don't remember what diameter shims our bikes have, but its a standard size. '15 FJ09 Link to comment Share on other sites More sharing options...
skipperT Posted August 4, 2018 Share Posted August 4, 2018 They’re 7.48mm IIRC (the other common size is 9.48mm and I mix up which models take which.) Measure the diameter to be sure. You can also order them from Yamaha, the Valve page of the parts fische will list optional part numbers for every size shim they offer. -Skip Link to comment Share on other sites More sharing options...
leedavis Posted August 5, 2018 Share Posted August 5, 2018 Rockymountainatvmc.com sells individual shims for $1.99/ea and keeps them in stock. Their web site can be annoying by only showing parts for a specific model bike. If so, get shims for a Yamaha WR250R. They're the same 7.48 shims we use. Link to comment Share on other sites More sharing options...
jsp Posted September 24, 2018 Share Posted September 24, 2018 Pro X valve shims are very good. I'm not impressed with Hot Cams shims. Here are the Pro X: https://www.rockymountainatvmc.com/p/2838/26634/Pro-X-Valve-Shim?v=11963 john Link to comment Share on other sites More sharing options...
jsp Posted September 24, 2018 Share Posted September 24, 2018 Tip: Set valve clearance to max spec on ALL valves. john Link to comment Share on other sites More sharing options...
Supporting Member piotrek Posted September 25, 2018 Supporting Member Share Posted September 25, 2018 Tip: Set valve clearance to max spec on ALL valves. john I will get almost there with exhaust (all were tight). Not yet decided on intake. All were in spec, so might just bump them out north of mid-point. Mind you, that shim sizing example noted in the service manual (3-7) looks curious. Link to comment Share on other sites More sharing options...
skipperT Posted September 25, 2018 Share Posted September 25, 2018 Tip: Set valve clearance to max spec on ALL valves. john I will get almost there with exhaust (all were tight). Not yet decided on intake. All were in spec, so might just bump them out north of mid-point. Mind you, that shim sizing example noted in the service manual (3-7) looks curious. How so? -Skip Link to comment Share on other sites More sharing options...
ryan Posted September 25, 2018 Author Share Posted September 25, 2018 I set them up to the max value this way ill be good longer as the engine wears clearance reduces so setting at mid would give me half of an acceptable range essentially Link to comment Share on other sites More sharing options...
skipperT Posted September 25, 2018 Share Posted September 25, 2018 How so? -Skip Example refers to the IN range of 0.11-0.20, with the measured lash of 0.25. The new shim is calculated to bring the lash back to 0.20 rather than a value somewhere part way through the specified range. Why pick an extreme value on such a wide range. Ah, I understand what your saying now. Yes, I agree it should be more in the middle of the range, rather than the loose side. Did I ever post up the formula that I use? It gives you the far tightest and the loosest possible value, then you can just pick one based on the measured spec - for example if one clearance felt more on the tight side vs the loose side in feel, you could pick the shim to match that situation. -S Link to comment Share on other sites More sharing options...
jsp Posted September 25, 2018 Share Posted September 25, 2018 Once upon a time a younger version of myself took a class at Kawasaki Motor Corp. given by Martin Carney. The class was called "High Performance Racing Engines". We learned how to degree cams, tinker with intake/ exhaust timing to tailor a powerband to the job at hand and many other important details to building a fast and reliable engine. The most controversial subject was setting the valve clearance. Martin told us to set the clearance to the max recommended spec (or a close as possible) and never cut corners. If that meant shimming al 16 valves, so be it. He went into detail why this was so important. My previous training was the exact opposite. I tried the NEW technique and was surprised how well it worked. I guess that's why Martin Carney was a factory instructor. I have used this on my street bikes of various brands with excellent results. I have used this on the latest 4 stroke MX engines and again excellent results. You won't know until you try it. My "High Performance Racing Engines" training certificate is posted in my shop. john Link to comment Share on other sites More sharing options...
skipperT Posted September 26, 2018 Share Posted September 26, 2018 @piotrek Here it is. This is the Honda method, (they don't provide charts): "Calculate the new shim thickness using the equation below: A = (B-C) + D A: New shim thickness B: Recorded valve clearance (mm) C: Specified valve clearance (mm) <---------- this is where you can use the high range # and the low range # in 2 [span] [/span][span] [/span][span] [/span][span] [/span][span] [/span][span] [/span][span] [/span][span] [/span][span] [/span][span] [/span][span] [/span][span] [/span][span] [/span][span] [/span][span] [/span][span] [/span][span] [/span][span] [/span]separate calculations to give you a shim size range. D: Old shim thickness " I find this much easier than using the chart, even though it means doing some math. -S Link to comment Share on other sites More sharing options...
Supporting Member piotrek Posted September 26, 2018 Supporting Member Share Posted September 26, 2018 Thanks @skippert ! Looks good... you get a range of shim sizes that will bring things into spec. I have something of sorts to help play with shim sizes... plug-in measured lash, target lash and size of factory shim, yielding a calculated new shim size. Since nominal sizes are what they are, I enter a closest nominal value and get new calculated lash. I could just do the last step... but that's no fun. Link to comment Share on other sites More sharing options...
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