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Post by Sitticuss on Aug 17, 2015 2:31:38 GMT -5
the gears on a vx50 will limit your top end being 13to1. I wouldn't spend a huge amount on upgrades. they will only help you get to 45mph faster. Unless that is what your looking for.
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Post by yongvx50 on Mar 29, 2016 10:39:57 GMT -5
Ok hopefully no more surgeries in the foreseeable future. I am ready to ride but it isn't. With the engines not running right and very little low end power, I guess it is time for a new top end in this thing. So what is the best and biggest low cost bbk I can put on this thing. The engine is a 1PE40QMB 2 stroke. Don't know if it is a 10mm or 12mm pin in it. Also what else will I need to swap out with the bbk installed. Would it be cheaper to just replace the engine with a 150 cc than going with a bbk and the parts to make it run right. This body style is the same as the 150cc one. If I had the money I would just buy a new scooter but money is tight so I need to keep the cost down as much was I can. Thanks.
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Post by 90GTVert on Mar 29, 2016 11:42:33 GMT -5
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Post by yongvx50 on Apr 5, 2016 20:47:25 GMT -5
Thanks Brent, you don't know how much I value your information that you give us on here. I'll start a taking it down as soon as I can get out there for a few days. Have a bad head cold so no bending over to work on it right now.
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Post by yongvx50 on Apr 8, 2016 18:49:36 GMT -5
Ok Guys and Gals, I found this kit that is a bit more expensive but a lot larger than 70cc. So if I went with this kit, 50cc to 90cc BBK, what else would I need for this to work correctly and would the block have to have any modifications to it? Ok am I missing something here? If a 70cc BBK is 47mm' s and this so called 90cc Kit is 48mm there is no way on earth that 1mm difference in piston size is going to increase the total CC' s by 20 with the same stroke length. Is these kits somehow changing the stroke of the engine without changing the connecting rod? Doing some quick math a 48mm bore and a 39.2 stroke would be right at a 71cc engine. That is if I am remembering my formulas correctly. Bore squared x stroke x pi/ 4 x the number of cylinders = total CC's and there is 61 cid's to 1 cubic liter of volume. Been 25+ years since I had to do mechanical math so someone correct me if my memory is off please.
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Post by gooddog on Apr 8, 2016 20:53:23 GMT -5
must be a longer stroke. email them for specs. I came up with 70cc as well for the 48mm bore
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Post by yongvx50 on Apr 8, 2016 21:08:44 GMT -5
must be a longer stroke. email them for specs. I came up with 70cc as well for the 48mm bore I came up with 68cc for the 47mm 70cc BBK and there is no new crank in that 90 kit. To get right at 90cc' s with a 39.2mm stroke you would need a 54mm bore jug.
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Post by niz76 on Apr 8, 2016 22:57:47 GMT -5
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Post by yongvx50 on Apr 8, 2016 23:58:07 GMT -5
Slapping on sounds allot better than more work lol. Thank Niz. I'll know more about what I can get away with on parts once I open it up and see how the jug looks on the inside and what kind of damage there is to this engine causing the low compression problems. I have not put a gauge on it myself yet but that is what I was told by the previous owner that the shop told him was the problem. I do know that it is high enough that once you get the fuel to it, it will start even though right now it will run wide open. Have not had the chance to fix that problem yet.
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