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I am the proud new owner of a 79 xs1100 special. I am a yamaha guy, as my other scoot is a not-so street legal 2009 r1, with a ton of mods. The PO of the xs didnt really know what he was doing with it. i got it for a fairly decent price of 1300, it was runing, although not so well. he had rebuilt the carbs, however i suspect not a decent job. i rejetted it. its at 145 mains with 45 pilots, with a 4-1 kerker exhaust, no baffle, and k and n style cone pods. ive gone through and rebuilt the front master cylinder and front calipers, rear calipers, forks ( changed the springs to progressive, and added fork gaiters ) and added progressive rear shocks. I also installed a tkat front fork brace, as well as a set of bar risers bringing it up and back 2". I fabbed up an aftermarket british-style front fairing, and i am working on a fiberglass xj style chin fairing. I have gone through and chopped off a ton of things and modified the rear so it is more bobber style. There were no side panels so I fabbed up a set from sheet metal, they look pretty cool. I'll load up some pics tonight, but they are going to be from my garage and not decent. the first few will be what she looked like originally before paint, and after with paint and modifications. Tomorrow, weather permitting Im going to take some better pics. ive always owned fuel injected r1's, this is my first vintage carb bike. i love it tho. I get more compliments on this thing than i do my $25k race prepped R1. Crazy!
Now, to the technical parts. I am needing some help.
#1 the rear master cylinder. I ordered a rebuild kit, but the piston and the rubber seals are just slightly too small. Ive been talking to the guy i ordered them from on ebay and he swears they are the right kit. its a k and l kit. the kit looks the same as other companys kits. but the parts that came out look nothing like the new kit. it more closely resembles the front masters inner parts. the rear master though looks like a 79 specials rear master, but the bore seems too large. i cleaned up the parts that came out, cleaned the spooge hole, and reinstalled them, and the rear master works fine. however now the guy i bought them from wont take them back, because they had brake fluid contact. the problem is i install the kit and the brake fluid just rushes by the rubber seals. i dont know if i have a different master cylinder or the wrong kit.
#2 the carbs. I couldnt get the carbs to synch right, so i took it apart and rejetted to the jet sizes earlier in the post. I believe the po had 140 mains and 40 pilot, but cant remember unless i dig out the old jets. now it seems like i can synch it better, but sometimes when i get above 6k rpms it seems to hit a wall, like maybe its running too rich. my gas mileage also sucks now, like between 25-30 mpg. tonight i took it out and it pulled hard all the way to redline, so i dont know what gives. I havent checked the float level yet nor the valves. Any advice would be greatly appreciated.
Im pretty sure i have a few more questions, but cant remember at the moment.
Now, to the technical parts. I am needing some help.
#1 the rear master cylinder. I ordered a rebuild kit, but the piston and the rubber seals are just slightly too small. Ive been talking to the guy i ordered them from on ebay and he swears they are the right kit. its a k and l kit. the kit looks the same as other companys kits. but the parts that came out look nothing like the new kit. it more closely resembles the front masters inner parts. the rear master though looks like a 79 specials rear master, but the bore seems too large. i cleaned up the parts that came out, cleaned the spooge hole, and reinstalled them, and the rear master works fine. however now the guy i bought them from wont take them back, because they had brake fluid contact. the problem is i install the kit and the brake fluid just rushes by the rubber seals. i dont know if i have a different master cylinder or the wrong kit.
#2 the carbs. I couldnt get the carbs to synch right, so i took it apart and rejetted to the jet sizes earlier in the post. I believe the po had 140 mains and 40 pilot, but cant remember unless i dig out the old jets. now it seems like i can synch it better, but sometimes when i get above 6k rpms it seems to hit a wall, like maybe its running too rich. my gas mileage also sucks now, like between 25-30 mpg. tonight i took it out and it pulled hard all the way to redline, so i dont know what gives. I havent checked the float level yet nor the valves. Any advice would be greatly appreciated.
Im pretty sure i have a few more questions, but cant remember at the moment.
Next, If the M/C parts are clearly different them advertised on Ebay, escalate and Ebay will give you your money back when you return them (takes about 30 days though). As to the power loss, sounds like you ran out of fuel flow, check your gas cap vent (open the cap and run it when it acts up, if that fixes it, clean the vent valve in the cap. As to the new jets, many new kits cause many new problems, so keep your OEM jets, just in case you need to change back
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