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Post by sussexscooterhead on Sept 4, 2007 21:42:18 GMT -5
The first place I'd go when looking to cross reference the valve springs would be your local Honda dealer. Considering the GY6 was originally a Honda motor I wouldn't be surprised if they could come up with something.
Really though, I don't know how you'd be able to tell for sure if one spring was more stiff than another.
Perhaps a Japanese cam chain would be a good idea as well if you ever managed to get stiffer springs.
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Post by earlwb on Sept 5, 2007 5:47:17 GMT -5
Basically you measure the wire thickness. The more thick a wire is the more stiff it is. So measuring the thicness of the spring wire works pretty good. They have a pretty good discussion on measuring springs here and terminology www.leespring.com/engguide4.asp?mypdfstr=C1The other method is to use a spring tension or compression guage. But these tend to get expensive. Now you can test springs more simply yourself. Fabricate a test fixture and use a fixed weight and measure the deflection or compression that you get. But the wire thickness technique works pretty good as you only need caliper to measure the springs with.
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Post by thelawnmowerman on Sept 5, 2007 20:38:03 GMT -5
Earl..I also suppose you would need to make sure that the engine valve springs you cannibalize are set up to handle the high rpms in question
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Post by earlwb on Sept 5, 2007 20:42:33 GMT -5
True it would depend on what kind of a engine you got them off of. A DOHC high RPM engine is a good candidate. A Pushrod valve operated engine would be a bad candidate. But sometimes valve springs that would work come from strange places, say for example a flat head lawnmower engine for example. Worth looking into anyway. Many of the lawnmower engines are 150 to 170cc already too. So they might be of the right size. One just needs to check the spring strengh.
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Post by MLN on Sept 5, 2007 22:19:03 GMT -5
I don't know of any lawnmower engines that turn 10,000 RPMs. They might fit but I don't think they are suited to the application.
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