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Post by KSR Moto on Mar 21, 2018 4:03:14 GMT -5
How much do you guys pay for a 47mm bbk for a gy6 50cc engine in your country?
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Post by zummerp on Mar 21, 2018 5:04:18 GMT -5
How much do you guys pay for a 47mm bbk for a gy6 50cc engine in your country? I can pick one up locally for $62. I’ve seen prices online from $30-$150! |
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Post by KSR Moto on Mar 21, 2018 5:14:52 GMT -5
Woow that much, in my area bbk 47mm costs 18$
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Post by diynuke on Mar 21, 2018 7:14:58 GMT -5
you get what you pay for tho. that's the only downside ;D
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Post by KSR Moto on Mar 21, 2018 9:20:47 GMT -5
you get what you pay for tho. that's the only downside ;D I agree, but I have this kit for 18$ on my engine even after 2 years it's worth it |
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Post by KSR Moto on Mar 21, 2018 9:21:43 GMT -5
Does anyone have pictures of expensive bbk 47mm just to compare with my cheap one
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Post by 90GTVert on Mar 21, 2018 9:43:59 GMT -5
You should be able to get direct from China BBKs in most areas for roughly $20. In the US, you aren't going to walk into a shop and buy one for that, or I certainly wouldn't expect to. We live in a land where people somehow get away with $500 bills for a BBK and install in some cases. Price is not everything. Someone could mark up the kit they bought for $10 for $50. It would still be the same kit.
Pictures aren't likely to really tell the story of the cheapest kit you can get from China vs something made in Taiwan or Europe. Materials and tolerances are probably where you'd find the difference. Much like Chinese scooter owners have varied stories, you'll find the same with very cheap cylinder kits. One scooter may have leaks and stripped bolts and who knows what else and the next may be hardly any trouble for miles/years. One cheap BBK may last years, the next may smoke from the day it's installed. Probably the biggest difference that I know of being an issue with the bottom tier Chinese kits is the piston rings. Simple solution there to make it a safe bet on install is to try to get rings expected to be of better quality to install on the cheap kit. The great number of people that have used cheap kits successfully would likely say that's totally unnecessary, while the folks with poor sealing that had to replace their rings would likely tell you it's a must.
I would also anticipate more potential for differences in the same kits. Maybe the deck height is a little different from piston height or the cylinder height or piston to cylinder wall clearances have more variance and so on. I'd expect all specs to be pretty close from one to the next if I bought say Airsal or Malossi. Chinese factories have been known to use what's available and machinery is not maintained to the highest standards when dealing with manufacturing of the cheapest parts possible. China can produce high quality things, but you aren't going to get the best they're capable of in a $20 kit. If Harley or Yamaha contracts a Chinese factory to make parts for them, they're gonna ensure they get a good product and it's not going to be the cheapest that China can offer. They need quality to uphold their brand reputation. When you make a kit with no name or any old name that someone willing to buy a crate full of wants on it, you aren't concerned about that.
I'm in no way saying not to buy a Chinese BBK. If you've got a 139QMB, your scoot is likely Chinese anyway. Perhaps for practical use, you'd never even notice the difference in a $20 kit and a $100 kit. I think it would be inaccurate to expect them to be equals though.
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Post by diynuke on Mar 21, 2018 9:45:31 GMT -5
you get what you pay for tho. that's the only downside ;D I agree, but I have this kit for 18$ on my engine even after 2 years it's worth it same going on here xD cheap kit for 23$ with head! still going strong but that scoot isn't my daily drive. so then i don't care xD |
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Post by KSR Moto on Mar 21, 2018 9:58:06 GMT -5
I agree, but I have this kit for 18$ on my engine even after 2 years it's worth it same going on here xD cheap kit for 23$ with head! still going strong but that scoot isn't my daily drive. so then i don't care xD I agree with both 90GTVert and you,I use this cheap kit beacause I drive my scoot whenewer I can and I put many miles on it,soo even if it lasts for 2 years or even a year, it is still worth it to me However I would never buy cheapest head I could find😉 |
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Post by benji on Mar 21, 2018 10:54:27 GMT -5
I got lucky w a $40 bbk for my 2t minarelli motor, but it was a ruima and a decent bore. Lasted a while too.
I had a Chinese bore on a bike that worked ok, but I think it had less hp than my oem jog motor. After I pulled it off to replace it w a tpr, I gave it to my brother who pointed out the transfer ports being small and not cleaned up or ground out at all. looked great for someone who wanted a cheap bore to hone out and do some porting, but definitely not hi-performance haha.
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Post by KSR Moto on Mar 21, 2018 11:06:49 GMT -5
I got lucky w a $40 bbk for my 2t minarelli motor, but it was a ruima and a decent bore. Lasted a while too. I had a Chinese bore on a bike that worked ok, but I think it had less hp than my oem jog motor. After I pulled it off to replace it w a tpr, I gave it to my brother who pointed out the transfer ports being small and not cleaned up or ground out at all. looked great for someone who wanted a cheap bore to hone out and do some porting, but definitely not hi-performance haha. It is probably much bigger deal on 2 stroke since there are pots, but on a 4 stroke different story |
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Post by benji on Mar 21, 2018 11:18:20 GMT -5
Maybe... But 2t is way more simple, with less moving parts. I would think the head on a 4t would be pretty important since it has so many parts in it.
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Post by KSR Moto on Mar 21, 2018 11:40:12 GMT -5
Maybe... But 2t is way more simple, with less moving parts. I would think the head on a 4t would be pretty important since it has so many parts in it. I agree, as I sad before I would never use the cheapest head |
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