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IT's BEEN A WHILE! Can a 50mm 100cc BBK fit on a gy6 50cc,

 
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guruhelp2



Joined: 06 Dec 2010
Posts: 145
Karma: 0

Location: Las Vegas, NV

PostPosted: Sun Jun 02, 2013 3:56 pm    Post subject: IT's BEEN A WHILE! Can a 50mm 100cc BBK fit on a gy6 50cc, Reply with quote

a seller onebay has sold a few and I'm considering once, myself for another scooter project that jumped into my hands.
but I don't think that big of a cylinder, unless VERY thinly over bored, could fit in the stock cases, without honing them.
What do the better brains say?


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chaz



Joined: 30 Jun 2012
Posts: 544
Karma: +16

Location: melksham wilts

PostPosted: Sun Jun 02, 2013 7:11 pm    Post subject: Reply with quote

70cc yes, 100 I think would put too much strain on the bottom end . sellers don't mind as they put problems down to whoever fitted it. if you try they say you were not skilled enough to do it. so fit at your peril.


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Scootin
Moderator


Joined: 09 Oct 2006
Posts: 7238
Karma: +168

Location: St. Johns MI USA

PostPosted: Thu Jun 06, 2013 1:06 am    Post subject: Reply with quote

Agreed
100cc kit is prolly too much. Can be done, but you will be putting a lot of extra strain on the engine which will shorten it's life by quite a bit.

If a big bore kit is not installed just right ,you will end up with worse performance than before. If you are not 100% sure you know what you are doing, don't try it.


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Yellow Scooter



Joined: 20 Mar 2007
Posts: 7113
Karma: +78

Location: North Carolina USA

PostPosted: Tue Aug 06, 2013 12:52 pm    Post subject: Reply with quote

It would be more feasible to trade up to a 125cc or 150cc.
Getting 100cc out of a 49cc will take some extensive machining, as well as upgrading the carb, exhaust, possibly the entire cylinder head, and that's just off the top of my head.... And after all that, it will still struggle to bust 50mph.


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