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Are the front brake caliper pistons the same size on the standards and specials?
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Yes, it is79 SF Special W/ Stock all original motor @ 384,000klms
Stock exhaust, stock airbox, XJ sump, 78E carbs, Xs1100RH seat, Bosch superhorns, 5/8ths front M/c, braided lines, sintered SBS pads, drilled discs, progressive springs, 8" 50w HID headlight 4300K, 2 x 50w HID spiral driving lights, KONI shocks, Spade fuse box
*Touring mode - Plexistar 2 screen, Gearsack rack & bag & saddlebags, homebuilt towbar
*"The Keg"- UC torana hubs, XS11 discs, Tokico 4 spot calipers -
Maybe down under, but not in the states. The Special front calipers share only bleed screws and banjo bolts with the standards, everything else is different, as is the lower fork sliders.Fast, Cheap, Reliable... Pick any two
'78E original owner - resto project
'78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
'82 XJ rebuild project
'80SG restified, red SOLD
'79F parts...
'81H more parts...
Other current bikes:
'93 XL1200 Anniversary Sportster 85RWHP
'86 XL883/1200 Chopper
'82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
Cage: '13 Mustang GT/CS with a few 'custom' touches
Yep, can't leave nuthin' alone...Comment
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Sorry, Steve.
There's only one part number listed for the brake piston in the calipers for all the XS1100's worldwide, ever. They're all the same.
Caliper external appeance is as different as can be but they've all got the same piston & seals79 SF Special W/ Stock all original motor @ 384,000klms
Stock exhaust, stock airbox, XJ sump, 78E carbs, Xs1100RH seat, Bosch superhorns, 5/8ths front M/c, braided lines, sintered SBS pads, drilled discs, progressive springs, 8" 50w HID headlight 4300K, 2 x 50w HID spiral driving lights, KONI shocks, Spade fuse box
*Touring mode - Plexistar 2 screen, Gearsack rack & bag & saddlebags, homebuilt towbar
*"The Keg"- UC torana hubs, XS11 discs, Tokico 4 spot calipersComment
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The caliper piston for the rear brake on a Special is the same as all three of the caliper pistons on a Standard. The caliper piston for a front brake on a Special is an entirely different animal. Various people over the years have had new pistons machined in small batches because they are no longer available. Some folks got pretty close in sourcing a piston from some obscure model of import car, but IIRC, that didn't pan out. Run the search tool at the top of the page using 'caliper piston standard special' as search keys and you'll find lots of discussion.Ken TalbotComment
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As Ken said, the Special front caliper is an entirely different assembly. You can now get reproduction Special pistons from at least one source; these guys:
http://cgi.ebay.com/ebaymotors/Yamah...item58861e7bee
These fit multiple models besides just the front of the Specials as noted.
For comparison, here's the standard caliper piston: http://cgi.ebay.com/ebaymotors/Yamah...item5d29df0487
Neither of these are available here from Yamaha (you can't even get a part number) but both can be found in the aftermarket.
I've got sets of each apart on my bench right now, and the differences are obvious.Last edited by crazy steve; 01-22-2011, 01:55 AM.Fast, Cheap, Reliable... Pick any two
'78E original owner - resto project
'78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
'82 XJ rebuild project
'80SG restified, red SOLD
'79F parts...
'81H more parts...
Other current bikes:
'93 XL1200 Anniversary Sportster 85RWHP
'86 XL883/1200 Chopper
'82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
Cage: '13 Mustang GT/CS with a few 'custom' touches
Yep, can't leave nuthin' alone...Comment
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I was going to recommend HVC Cycle too but at their website instead of on fleabay. http://www.hvccycle.com/
GeezerHi my name is Tony and I'm a bikeoholic.
The old gray biker ain't what he used to be.Comment
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75 cents cheaper.Originally posted by Geezer View PostNathan
KD9ARL
μολὼν λαβέ
1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters
Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner
In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore RooseveltComment
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Gotta make up those eBay fees.....Originally posted by natemoen View Post
Fast, Cheap, Reliable... Pick any two
'78E original owner - resto project
'78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
'82 XJ rebuild project
'80SG restified, red SOLD
'79F parts...
'81H more parts...
Other current bikes:
'93 XL1200 Anniversary Sportster 85RWHP
'86 XL883/1200 Chopper
'82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
Cage: '13 Mustang GT/CS with a few 'custom' touches
Yep, can't leave nuthin' alone...Comment
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I figures the fees would have been higher than that!Nathan
KD9ARL
μολὼν λαβέ
1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters
Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner
In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore RooseveltComment
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I can vouch for those replacement pistons, they are the right size. I re-built both my front calipers last year and got the pistons from hvc cycle, they fit perfectly. georgefix on ebay has the caliper seal kits if you need em.79 XS1100 Special
Kerker 4-1, Pods, BS34 old style carbs, plastic floats, 147.5 mains, progressive rear suspension (restoring)Comment
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