Big Bore Options?
I have heard everyone talking about the big bore upgrade. What all is needed for this upgrade? Just the (Kit) head, pistons, & cam or do you have to change the carburetor also? I have stripped out spark plug threads on my current head and was thinking of the upgrade if I have to by one anyway. Anyone done this and how much should I expect to gain from this. Thanks.
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Hi Tybic,
I did my 58.5 Big bore kit myself. I think it's the biggest you can go without having the crank case machined. I'd never taken an engine apart, so if I can do it anyone can. I did so many upgrades at once that I can't tell you the difference the BBK will make, but more CC's = more HP. If you decide to go big, make sure you have a pro machine your cases for you. EDIT: You'll need to re-jet your carb.. |
Where did you get your kit from? Do you have a link?
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wildbob is correct the biggest bore you can go is 58.5 without machining the case. I wouldn't recommend going past 61mm bore on the stock case because the cylinder walls get way to thin, making the engine very unreliable. A head and cam combo will wake the buggy up. Once you do that then a big bore with a stroker crank it turns into a whole new buggy.
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Is there anything I need to know about the different versions of the GY6 (old vs New) or will any 58.5mm head and cam fit when I go to ordering my kit. Bought my carbide used and I am guessing it is around a 2008 ASW carbide 7150 1500cc GY6 (not sure).
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Nice Thanks.
Plan is to do it. I am thinking 58.5 with a A12 cam, do I need to rejet the carb or anything else? I think the previous owner already gutted the exhaust. Where to buy or not to buy any suggestions on that? |
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http://www.ebay.com/itm/SCOOTER-125C...701741&vxp=mtr
this is what I would recommend, you get ur choice for the 58.5 and you get your choice of camshaft. Also yes you are going to have to jet the carb, I would buy a pack of different size jets for tuning. |
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