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 Post subject: why is it so hard to find a BBK?
PostPosted: Wed Nov 11, 2015 12:25 pm 
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Motorcycle: Rebel 250
Rebel: 250
Country: USA
State/Province: FL
City: Pompano
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on ebay I find all kinds of cylinders, second hand, some sellers are selling new kits,
But I couldn't find one, selling slightly bored out kits, with larger diameter pistons.

I wonder why? I'm not sure, but think it wouldn't be that hard to sell a 249 to 275cc kit for the Rebel 250?
It's a very popular bike, slightly underpowered for interstate riding, but with the right sprockets, and a 10 to 20mph tailwind, it does 90mph!


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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Wed Nov 11, 2015 5:27 pm 
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Motorcycle: Rebel 250 plus a few others
Rebel: 250
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I would hazard a guess that very few Rebels ever see enough mileage to wear out the original pistons and bores. That and the fact that used engines are readily available for much less than the cost of a major overhaul.

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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Wed Nov 11, 2015 5:59 pm 
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Joined: Jul 25, 2003
Motorcycle: 98 Valkyrie
Rebel: 250
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City: Vidalia
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usually because it's more cost-efficient to simply buy a more powerful bike.

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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Mon Nov 16, 2015 7:55 pm 
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Duke wrote:
usually because it's more cost-efficient to simply buy a more powerful bike.

I wouldn't think so...
The replacement cylinder heads they're selling, with pistons and everything cost about $170.


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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Mon Nov 16, 2015 8:00 pm 
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Joined: Oct 28, 2008
Motorcycle: 1986 Kawasaki Vulcan 750
Rebel: Other
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Who is they?

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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Mon Nov 16, 2015 8:09 pm 
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Rebel: 250
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ebay.


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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Mon Nov 16, 2015 8:11 pm 
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Motorcycle: 1986 Kawasaki Vulcan 750
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Brand new components not sourced from low grade assembly lines with minimal quality control?

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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Mon Nov 16, 2015 9:26 pm 
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Joined: Jul 25, 2003
Motorcycle: 98 Valkyrie
Rebel: 250
Country: USA
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City: Vidalia
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MeeLee wrote:
Duke wrote:
usually because it's more cost-efficient to simply buy a more powerful bike.

I wouldn't think so...
The replacement cylinder heads they're selling, with pistons and everything cost about $170.



Those prices are meaningless, as they don't fit the bike at hand. If the entire kit was ten dollars, it's still not a factor.

For a Rebel, that's good used engine country, price-wise. So why repair one when you can replace it for roughly that same amount?

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"Skills must be Learned"
------ Herb Christian


"Ask your doctor if medical advice from a television commercial is right for _you_."


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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Mon Nov 16, 2015 9:41 pm 
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The sellers claim they do fit the 250 Rebel, but I'm skeptical that they're produced with anything approaching usable quality. Here's one example of a cylinder, gaskets, and pistons for $120 shipped.
http://www.ebay.com/itm/181606956532

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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Mon Nov 16, 2015 9:48 pm 
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That's not an overbore kit. Have we changed topics?

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"Skills must be Learned"
------ Herb Christian


"Ask your doctor if medical advice from a television commercial is right for _you_."


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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Mon Nov 16, 2015 9:50 pm 
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Motorcycle: 1986 Kawasaki Vulcan 750
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MeeLee suggested that there were standard bore kits, but nothing out there for overbores. When it was suggested that the cost would be prohibitive, he pointed to eBay as a source for ridiculously inexpensive standard bore components.

Does that unmuddy things at all?

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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Mon Nov 16, 2015 9:59 pm 
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Well, it confirms we've dodged any specifics, yes. Thank you.

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"Skills must be Learned"
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"Ask your doctor if medical advice from a television commercial is right for _you_."


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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Mon Nov 16, 2015 10:04 pm 
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Oh, I'll gladly acknowledge that we've accomplished exactly nothing here.

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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Tue Nov 17, 2015 12:01 am 
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This is vaguely illuminating.

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 Post subject: Re: why is it so hard to find a BBK?
PostPosted: Tue Nov 17, 2015 7:56 pm 
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Motorcycle: Rebel 250
Rebel: 250
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I don't know..
The price of a used cylinder kit, going for $140, or a new kit going for $170 or less, all fitting Honda Rebels.
The newer might not be up to Honda quality, but I remember running my Chinese scooters 25k miles without any issues; so I don't think these new cylinder kits will be that bad of a buy.
Perhaps a good and original second hand kit might be better than a Chinese version, I still think the Chinese variant isn't a bad buy at all!
They can't do much wrong with the aluminum cooling fins.
Just the metal sleeve, and the pistons could be of lower quality, but even if they where only Chinese scooter quality, they would still last 25k miles the least.
Heck, I don't even have 25k miles on my Rebel!


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