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Standard tank on a Special bike
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nj1639
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Joined: Aug 22, 2007
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Location: Switzerland County, Indiana

PostPosted: June 5, 2009, 7:41 am    Post subject: Standard tank on a Special bike

Anybody else running one?
I found that with the single petcock setup there's a good bit of fuel left in the right side of the tank when approaching empty.
I'm using an aftermarket dual output petcock from Old Bike Barn. Took the base off a stock vacuum petcock and put a simple lawn mower fuel shut off valve in one of the holes and J.B. welded it and the other hole. Then ran a fuel line to the unused input/output of the aftermarket petcock.
Reserve/reserve.

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dpmphoto
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Joined: Apr 18, 2007
Posts: 485
Location: syracuse NY

PostPosted: June 13, 2009, 1:02 pm    Post subject: Re: Standard tank on a Special bike

Yes I'm running one,no problem junked the carbs used older petcocks
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bbjsw10
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Joined: Jul 15, 2009
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PostPosted: August 10, 2009, 9:26 pm    Post subject: Re: Standard tank on a Special bike

Rather than starting a new post on this, does anyone have a picture of the 2 side by side. I was thinking of doing the swap as well, building a scrambler and more range would be nice.

I just wanna see a side by side for size comparison or if someone could measure theres for me, L x W x H?
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IAmGrowler
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Joined: May 04, 2009
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Location: Seattle, WA

PostPosted: August 10, 2009, 9:40 pm    Post subject: Re: Standard tank on a Special bike

bbjsw10 wrote:
Rather than starting a new post on this, does anyone have a picture of the 2 side by side. I was thinking of doing the swap as well, building a scrambler and more range would be nice.

I just wanna see a side by side for size comparison or if someone could measure theres for me, L x W x H?

No photo, but I have a '79 Special with a '77 Standard tank with no issues whatsoever.

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bluebikerblan
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Joined: Apr 18, 2007
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Location: Brigham City, Utah

PostPosted: August 10, 2009, 10:19 pm    Post subject: Re: Standard tank on a Special bike

Ditto on using "Standard" model tanks on Specials. I've used several from 75,76 & 77 models on 78 & 79 Specials. Usually for reasons of extra capacity although I also prefer the standard tanks shape .
I also usually dump the vacuum valve part of the specials petcocks and convert them via the Wikipedia modification to manual operation with a shut-off while I'm at it. I've had too many problems depending on the aged vacuum valves to shut off fuel. As an aside, I always dump those
"roto-tiller" specials handlebars too. Best, Blue

ps.....here's the link to the 650wiki.org procedure for making the petcock
conversion from vacuum to manual. It'a a repeat......
650wiki.org/index.php/...Conversion

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Last edited by bluebikerblan on August 11, 2009, 10:10 am; edited 1 time in total
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jayel
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Joined: Apr 16, 2006
Posts: 3417
Location: SE Iowa 1974 TX650A

PostPosted: August 11, 2009, 9:43 am    Post subject: Re: Standard tank on a Special bike

bbjsw10 wrote:
Rather than starting a new post on this, does anyone have a picture of the 2 side by side. I was thinking of doing the swap as well, building a scrambler and more range would be nice.

I just wanna see a side by side for size comparison or if someone could measure theres for me, L x W x H?
Standard is 12" at the widest Special is 10 1/2" at the tail Standard is 7" Special is 6" no difference in height or lenght... Standard tank is 74 model 74-83 Special is 79 or later, will interchange no problem



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yamaman
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Joined: Jan 04, 2007
Posts: 1638
Location: Perth Western Australia

PostPosted: August 11, 2009, 10:17 am    Post subject: Re: Standard tank on a Special bike

I like the cigarette lighter Jayel, where's the ash tray?
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jayel
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PostPosted: August 11, 2009, 12:58 pm    Post subject: Re: Standard tank on a Special bike

from the looks of things the floor of the shed.....
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pumps
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Joined: May 29, 2007
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Location: Kansas City, Missouri, U.S.A.- 1977 XS650 "D" Standard

PostPosted: August 11, 2009, 2:38 pm    Post subject: Re: Standard tank on a Special bike

An old retired firefighter friend of mine built a log splitter and put a lighter and a radio on it.
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bbjsw10
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Joined: Jul 15, 2009
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PostPosted: August 11, 2009, 5:49 pm    Post subject: Re: Standard tank on a Special bike

Jayel, that is exactly what I wanted Thanks !! Great pic to compare them. I almost like the standard tank better, nice shape to it.

Now to see if I can find someone who would trade their standard tank for my special. Anyone?
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Imcgyver
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Joined: Jun 25, 2008
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PostPosted: December 20, 2009, 5:11 pm    Post subject: Re: Standard tank on a Special bike

Hello I was wondering what the capacity difference was between the standard and the special tank?
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nj1639
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Joined: Aug 22, 2007
Posts: 839
Location: Switzerland County, Indiana

PostPosted: December 20, 2009, 5:25 pm    Post subject: Re: Standard tank on a Special bike

1 gallon more with the standard.
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pamcopete
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Joined: Oct 10, 2008
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Location: South Carolina

PostPosted: December 20, 2009, 5:25 pm    Post subject: Re: Standard tank on a Special bike

Standard tank: 3.96 US Gal. Special tank: 3.04 or 2.9 US Gal.
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royfisk
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Location: winchester, new hampshire usa

PostPosted: December 20, 2009, 8:23 pm    Post subject: Re: Standard tank on a Special bike

My 75 b xsl bike in my gallery has a special tank. The 81 8 hour reserection has a standard tank on it. Dont like the single petcock tanks but they do interchange. I was told that the earley 70's pre 441 tanks will not interchange, can anyone verify that? Will a 73 tank fit a 75? Also will a 70 / 71 rear fender and brackets fit a 75?
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