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garyr87 Started a new thread Possible group buy: 98-02, 03-04 CR125 replacement cylinder with corrected port and transfer layout
9/27/2022 7:50pm Hello everyone, I am a long time VitalMX lurker, a mechanical engineer and big time fan of the late CR125. Even by today's standards, the last generation CR125 aluminum frame is simply outstanding in terms of handling, suspension and high speed stability. Well the old school KYB suspension components are dated but they can be swapped for newer Showa components...
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garyr87 Added a reply to James Stewart on Honda
3/12/2017 9:04pm When did he say this?
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garyr87 Added a reply to Possible group buy: 98-02, 03-04 CR125 replacement cylinder with corrected port and transfer layout
2/3/2017 12:06pm Yea it's certainly not cheap. But it's a short a production run so it makes sense. Yamaha has been using that same basic casting since 96'...imagine how many they have sold and how fine tuned that process is for them. Porting will be as cast like an OEM cylinder but it won't be necessary to do any alterations unless you...
garyr87 Added a reply to Possible group buy: 98-02, 03-04 CR125 replacement cylinder with corrected port and transfer layout
2/3/2017 11:08am Quick update: Price per casting @50 units would be $249 which covers the cost of tooling. Still would need to be machined and plated. I'll have to ask Millennium what kind of deal I can get for doing 50 cylinders at once but if I can machine for around $150 and plate for $150, the cylinder would be $550. A...
garyr87 Added a reply to Possible group buy: 98-02, 03-04 CR125 replacement cylinder with corrected port and transfer layout
2/1/2017 9:36am I don't mind spending the money to get things going and I have solid modeling software and access to aircraft quality CNC equipment to help keep things down. Perhaps over time I could recoup my costs. I may try to modify an 05+ cylinder to adapt the earlier style crankcase before anything else however. This would require filling and reboring...
garyr87 Added a reply to Possible group buy: 98-02, 03-04 CR125 replacement cylinder with corrected port and transfer layout
2/1/2017 8:03am I have never had my hands on a Mugen cylinder but I imagine even that can be improved upon. Computational Fluid Dynamics has come a long way in the past 20 years and that's where real gains are to be head. From what I gather, port arrangements, timing and areas haven't changed much since the 90's for any of the...
garyr87 Added a reply to Possible group buy: 98-02, 03-04 CR125 replacement cylinder with corrected port and transfer layout
1/31/2017 7:09pm Redesigning the power valve is a complex task and will add considerably to the cost of the cylinder. That said, I do like Suzuki's system better and can see it being much easier to adapt to Honda's valve actuator system. For now I am shooting a bit low but, as things progress I will up the ante. I have even...
garyr87 Added a reply to Possible group buy: 98-02, 03-04 CR125 replacement cylinder with corrected port and transfer layout
1/31/2017 7:10pm I'll certainly keep you guys in mind when the time comes. I am reserving the billet for the more complex changes. I like the cast cylinders because they look externally OEM.