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150cc GY6 and Under Engine Tech GY6 and Smaller Technical Discussion Forum

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  #1  
Old 06-28-2016, 03:09 PM
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Default 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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Old 06-30-2016, 09:59 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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Old 06-30-2016, 10:58 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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Old 06-30-2016, 04:13 PM
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Good deal...thank yall
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Old 07-01-2016, 10:52 AM
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The big bore kit alone won't produce any more power. A performance head ported and polished correctly with a performance cam will wake that thing up.
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Old 07-06-2016, 09:24 PM
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Any suggestions for a good performance head and cam??
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Old 07-07-2016, 10:00 AM
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Give me a call 662-301-1563 and I can give you a few different options.
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Old 07-09-2016, 11:15 AM
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Sure will man, i will try to call you monday if that is ok for ya?
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Old 07-09-2016, 11:37 AM
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Talk to you on Monday.
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