Topic: air fuel mix screw

[neil10]

when I turn screww in I get more rpm  runs to stop before  being correct mixture

[eldar]

Depending you your year of bike, 69-76 use air screws.77/78 are fuel screws.
Air screws meter the amount of air so if you turn them in, you get less air and the mix becomes richer. It is the opposite with fuel screws. In makes the mix leaner.

So it sounds like you have a 77/78 as you say that when you turn in the screws, rpms go up.

[Gordon]

Neil,  It's been mentioned before, but I'd like to bring it up again.  It will be a service to yourself and the others on this forum if you will consolidate your numerous threads regarding essentially the same issues into one thread, instead of starting a new on each time you have something else to add or to ask. 

If you're not sure how to do that, I'm sure one of the Moderators would be happy to help.

[Gordon]

We don't mean to jump all over you, Neil.  We actually want to help, but you need to make it as easy as possible for the rest of us to help you. 

[neil10]

Just asking a question  trying to get assistants

[dustyc]

You're learning.  Just like talking to people live, there's a proper way to do it.  Don't worry, everyone wants to help. 

It's just easier to answer questions about one system in one thread.  It helps keep down redundant answers and incomplete answers.

It's also important to give as much information about what you're working on.  There are 350, 400, 500, 550, 550, 650, 750 with all thier model varieties and spanning over 10 years, plus modifications over 30+ years of owners.  I guarantee there is a helpful person that represents every variation, you just have to narrow it down and put it in one place so they can help. 

[Bob Wessner]

It's just easier to answer questions about one system in one thread.

And you will only have to go to one thread for the answers.

[neil10]

ok  thks   bi
sohc 750  k4 standard equipment
ok tune bike  points, timing, new plugs adjusted valves
bike was sitting long time and floats were leaking
pulled carbs apart full of muck some jets completely blocked
installed new kits  synced carbs with gauges
alll fine except low constant speed jerky action     Neil

[Gordon]

ok  thks   bi
sohc 750  k4 standard equipment
ok tune bike  points, timing, new plugs adjusted valves
bike was sitting long time and floats were leaking
pulled carbs apart full of muck some jets completely blocked
installed new kits  synced carbs with gauges
alll fine except low constant speed jerky action     Neil

Now we're talking!!

Did you soak the carbs and/or blow compressed air through all the fuel passages?  You may still have a blocked or partially blocked idle jet circuit.

[dustyc]

What speed?  In what gear?  At what throttle position?  Could it be something to do with your chain?  If they sit and rust, they can have stuck spots.  Also, I know you said standard equipment, but if someone cut off the pipes or put on a 4 into 1, your center stand could be rubbing the chain.

[neil10]

ok sprayed carb clean all around
cleaned out all visual muck
After this problem I reinstalled all the old jets no difference
low rpm causes the slight jerk
also adde additive for to keep things clean

[neil10]

just gone out and retuned re synced everthing
at idle doesn't jerk seems pretty good
 hard to judge when you havn't had bike like this, hard to judge what is good for this model
my jet needle clip position was at 2nd from bottom and I guess is standard position as it look like I was first to diasassemble carbs yellow paint was stilll intact before i got to it.

[dustyc]

hard to judge when you havn't had bike like this which was running well originally

Yeah, I know.  I built my 500 (first street bike) out of a box of parts and the PO had so many things wrong.  I groped my way through it all and now she fires on the first kick and runs great.  My neighbor has trouble keeping up with me on his 550. 

You'll get it.