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Post by 90GTVert on Feb 24, 2011 10:29:44 GMT -5
They're OK, but I think the Naraku and NCY stuff is better quality. My cheap BBK came complete with rust. Enviromoto.com has pretty good prices and there is a 10% off coupon code for forum members (see the banner on the main page).
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Post by yggdrasil on Feb 25, 2011 10:19:37 GMT -5
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Post by 90GTVert on Feb 25, 2011 10:57:02 GMT -5
I have a couple of comments, mostly regarding the bore rather than the particular kit...
First, don't expect 100cc, it's closer to 80cc with that bore.
Prepare for the possibility of needing to clearance the cases for the 50mm BBK. Most newer scoots can handle it, but it's not a guarantee.
Be willing to accept the fact that engine longevity may severely decrease. Then again, it may not. 50mm plus kits have caused early failures for a number of people online. There are also a lot of folks who say they've had no problems.
And last, but not least, if you are still only doing 25MPH I suspect you won't see the full potential of the BBK. The 50cc GY6s are not known to be fast, but you should still be capable of over 25mph. Maybe you'll get lucky and the problem had something to do with the top end. In that case, you may see it's potential.
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Post by lshigham on Feb 25, 2011 11:48:10 GMT -5
It ain't 100cc, and when it comes with so many extras for such a low price I am dubious about the quality.
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Post by lshigham on Feb 25, 2011 11:49:13 GMT -5
Or, what Brent said. Should type faster!
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Post by rocketdog on Feb 26, 2011 6:46:29 GMT -5
50mm X 41.4mm=81.299mm Not even close to a hundred. I would beware of anyone selling a kit with such a claim. I'm not trying to dissuade you from boring your scoot. Just that there are some pretty poor kits out there and to be careful. I'm going to plug one of these into a Kymco Filly. A 50mm Airsal kit.   47mm next to the Airsal 50mm  I can assure you it won't be plug and play. If you prefer a kit with just about everything you need, try this 47mm kit. The quality is good and you've got Enviro to call if you have a problem. And us of course. enviromoto.ecrater.com/p/3956702/stage-4-72cc-power-pack-139qmb-aRD |
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Post by yggdrasil on Feb 28, 2011 13:07:38 GMT -5
Sorry, guys I ordered it before most of the posts.
The deciding factor was that I emailed the ebay seller and he got back to me pretty quick and answered a few questions I had regarding some of the parts.
So I figured I would take my chances.
I also ordered (from scrappy dog) a new cdi and a new coil as I suspect these may have been the original problem.
I'll let you know how it all turns out.
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Post by 90GTVert on Feb 28, 2011 13:32:27 GMT -5
Well, good luck with it and I'm hoping you see some much more impressive speeds. ;D
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Post by builditright on Feb 28, 2011 17:40:35 GMT -5
Vgg,
Just a little note, I think if you check the video that they tell you to use is the one that Brent has done. But that is not what I wanted you to note. The oil pump that comes with that kit is the same as the one that is on your scoot and you do not need to use it. It is a pain and you will have to do a lot of extra work that you do not need to do.
Oh and good luck with your BBK hope it gives you what you want.
Bill
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Post by yggdrasil on Mar 1, 2011 10:34:06 GMT -5
I paid 2 dollars extra for shipping and I had it by Monday afternoon, ordered it Friday.
The parts are all there as advertised. The casting is a bit substandard but it appears that it will work (justa dry fit together seemed like it looked good). I did notice a small ding on the edge of the top of the cylinder cover like the part bumped into another part and it got dinged but besides that the parts all look viable. Ill take close up pics if anyone is interested.
The one thing that I have heard about these kits is that the piston may not reach the top of the stroke leaving for lower than expected compression. I will find out.
When I contacted him he mentioned that the oil pump was a larger capacity oil pump than what is in the scooter.
I don't know if this is true.
As far as a smooth transaction goes everything seems good.
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Post by yggdrasil on Mar 1, 2011 10:38:04 GMT -5
One more comment, the rollers are 8gram .
I think this is way to heavy to be usefull?
maybe I will mix and match them.
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Post by 90GTVert on Mar 1, 2011 13:31:55 GMT -5
8g is probably too much, but it's hard to say. I'd stick it together and leave the CVT alone. That way you get to see what the BBK really did. Then you can tune accordingly.
If you wanna post pics, please do. We always like more info. I'm curious about the piston's position relative to deck as well.
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Post by yggdrasil on Mar 2, 2011 21:54:15 GMT -5
Got the new coil today and replaced it, that wasn't the problem. Not sure what's up. I wanted to get that out of the way b4 I did the whole bbk.
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Post by speedy1125 on Mar 2, 2011 23:08:40 GMT -5
Brents mechanical timing was way off, once he fixed that, he got lots more power. Have you verified mechanical timing?
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Post by 90GTVert on Mar 2, 2011 23:53:14 GMT -5
That would be a good thing to do while it's apart for the BBK.
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