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| 150cc GY6 and Under Engine Tech GY6 and Smaller Technical Discussion Forum |
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#1
06-28-2016, 04:09 PM
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GY6 150 Big Bore Kit????
Hey Guys, working on a trail master buggy with the GY6 150, and it has the internal reverse...I'm having to replace the piston and rings, so I thought while I'm doing that might as well put a big bore kit on this bad boy... What name brand do I need to look for, and what size can I get away with, without having to bore my case out?? Found a site that says a 58.5 is the largest you can go without boring ur case, but another site is saying you can put a 61mm on without boring ur case? I don't know? Any other ideas like a different crank, cam, should I have the heads ported? Probally a good idea to replace my timing chain too huh?
 Any help will be greatly appreciated...
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#2
06-30-2016, 10:59 AM
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A good big valve head with bigger ports and stiffer valve springs will be a nice combo with a upgraded camshaft. You can also hand port the manifold a little bit. With the internal reverse you cant put a stroker crankshaft in but can bore it. Anything over 58.5 needs to be bored I believe there is a kit that's 61mm that's drop in but then the jug walls are supper thin your better off getting the case bored for a 61mm bore setup.
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Hammer head Single seater know as herbie under construction Aluminum fuel tank, aluminum wheels, custom fuel/cargo rack, entire rewire, trail tech vapor, ported big valve head, a12camshaft, 12 gram sliders, straight intake, kirkey wide seat, front end extension. 4 point harness, welded cage. Hammerhead exhaust. Blade Single Seater Restore welded cage, engine build, new wiring harness/electric box, spun aluminum fuel tank. |
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#3
06-30-2016, 11:58 AM
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I went with the 58.5 as everyone said it was the safest and did not need additional machine work.
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