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i've been following the threads on the timing adv on our bikes, but mine seems a little different. i have an 81 mns, it has the 4ro ign. module. the motor is a 4r0. i have a vacuum line going from the #2 carb body to the left side of the motor, where the timing adv is located. i'm confused, as what i've read said that my bike should have electronic adv, not vacuum. any ideas?
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1981 xs1100 midnight special
1983 750 midnight maxim
resurrected:
1977 goldwing
1980 cb750
North central Wisconsin -
The electronic advance is built into the TCI, but it's still got a vacuum advance too. My understanding is that the electronic advance makes up for the lack of the mechanical advance mechanism, that also works in conjunction with the vacuum advance.Last edited by dbeardslee; 05-26-2010, 09:46 AM.I think I have a loose screw behind the handlebars.
'79 XS11 Standard, Jardine 4/1, Dyna DC1-1 Coils, 145 mains, 45 pilots, plastic floats - 25.7mm, XV920 fuel valves, inline fuel filters, speed bleeders, Mikes XS pods, spade-type fuse block, fork brace, progressive fork springs/shocks, manual petcocks, 750 FD, Venture cam chain tensioner, SS brake lines -
Yep, Doug nailed it! The 81 models removed the mech advance, but kept the vacuum adv. Mech was changed to electronic in the TCI.
Now, in 82, when they switched to the XJ, they also removed the vacuum adv, changed it to a vac sensor that signals the TCI and built that advance into the TCI as well.Life is what happens while your planning everything else!
When your work speaks for itself, don't interrupt.
81 XS1100 Special - Humpty Dumpty
80 XS1100 Special - Project Resurrection
Previously owned
93 GSX600F
80 XS1100 Special - Ruby
81 XS1100 Special
81 CB750 C
80 CB750 C
78 XS750Comment
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Thanks for the explanation gentleman. seems like a strange set up, but it works.1981 xs1100 midnight special
1983 750 midnight maxim
resurrected:
1977 goldwing
1980 cb750
North central WisconsinComment
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