hi everyone,bikes running rich at low revs and tickover.i,m about to do a tps check but before i do i,ve noticed that the brass screws on the t/body are only set at 1 turn out?could this be my rich running problem?anyone out there
1100gs throttle body brass screw settings
- Thread starter bart2181
- Start date
Stewart H
Registered user
My throttle body synch paperwork says start them at 2.5 turns out, synch the tickover and @3000 then turn them in incrementally together until desired idle speed is reached. that is the last bit though.
Stewart
Stewart
cheers stewart will try that tommorow
The brass screws adjust idle speed, nothing else. And it doesn't really matter how many turns in or out they are. You need however many turns it takes to idle at the speed you desire. I like my bike to idle at 800-900 revs, and couldn't tell you how many turns out the screws are.
Depending on the year of your bike it could be fitted with a lambda or a CO pot, which is what you adjust for mixture. You require a CO reading of around 2%
cheers mr steptoe
bikes fitted with a lamda sensor(i,m gonna test it tommorow)i,ve checked plugs after a good 70mph run and ok,but aftera good 20-30mph run they are sooty and you can smell exhaust fumes at idle.
bikes fitted with a lamda sensor(i,m gonna test it tommorow)i,ve checked plugs after a good 70mph run and ok,but aftera good 20-30mph run they are sooty and you can smell exhaust fumes at idle.fundura
Guest
Always thought the brass screws adjusted the balance at idle 
I adj them first for perfect idle sync,then right side cable for balance at 3000rpm. been doing it wrong all this time
I adj them first for perfect idle sync,then right side cable for balance at 3000rpm. been doing it wrong all this timeyes mate,that sounds about right to me thats how i balance my throttles.unless we,ve both been doing it wrong
Supertech
Guest
i thought balance was the opening of the throttle butterflies in relation to each other. you can set the idle adjusters so one pot pulls the other, but that won't make a bit of difference to the balance as you open up the throttles.
The big brass screws adjust the balance it idle (when the butterflies are on their stops), balance off idle is done using the cable adjuster.
Whatever you do, don't touch the throttle stops - these are set in the factory using a flowbench and shouldn't need adjusting.
Whatever you do, don't touch the throttle stops - these are set in the factory using a flowbench and shouldn't need adjusting.
Supertech
Guest
surely the idle adjustment will lift the butterflies off the stops a tad? Seems a bit of an odd setting.
Stewart H
Registered user
The butterflies are factory set slightly open, the BBS allows air through a separate drilling
Stewart
The brass idle adjustment screws have no effect on the butterflies at all.
i think he means the cable adjuster.
but i can see why you're confused.........
...its cos you're old
but i can see why you're confused.........
...its cos you're old
Supertech
Guest
Its a normal state for me and being old gives me the perfect excuse for being in that state.
Cheeky fecker
Cheeky fecker
fundura
Guest
But the do have an effect on the balance sync at idle
Well feck me, i wondered what they were for.
Well feck me, i wondered what they were for.
You need to read a manual or something - learn a bit about these BMW's
fundura
Guest
The brass screws adjust idle speed, nothing else. And it doesn't really matter how many turns in or out they are. You need however many turns it takes to idle at the speed you desire. I like my bike to idle at 800-900 revs, and couldn't tell you how many turns out the screws are.
fundura
Guest
The brass screws adjust idle speed, nothing else. And it doesn't really matter how many turns in or out they are. You need however many turns it takes to idle at the speed you desire. I like my bike to idle at 800-900 revs, and couldn't tell you how many turns out the screws are.
Seems they do both, Idle and throttle sync
Sorry for double post
Nice training video here to download (right click and "save as")
http://www.carlsalter.com/aaman/BMW__R4V%20Throttle%20Synch_medium.wmv
