this is on a ninja 250.  thats irrelevant exept for the fact that i want to make it clear it is NOT my bike  :lol:.  carbs were effed up bad so we took them apart and cleaned them.  i synched them as best i could using srinaths method.  

took the brass plug out to get to the mixture screw.  set them to 1 turn out.  bike ran but had no power.  then i reset them to 1/2 turn out.  bike starts on choke only and dies when given throttle or when choke is off.   when i first took the plugs out, the screws were all the way down.  didnt seem right to me but i checked it 2x.  

second and less important question:  are the butterlies supposed to be completely shut when throttle is off?  because there is a little sliver of light coming through.  the adjuster screw only adjusts the one side...


thanks in advance.  (this kid is stuck at my house till we can get his bike running.  i want him gone so i can sleep.)

ok..  couple things... turning on the choke richens the mix.  your mix screws prolly aren't out far enough.

butterflies should be open a tiny tiny bit

yeah the adjuster screw does one side only... that's the screw to sync them... after they are identical as far as light passing through, back the idle screw out until it's not touching it's little rest... then turn it in to barely touch the arm that moves the butterflies




try the mix screws turned out 1-2 turns.  sounds like it's way lean to me (because it runs with choke on)

so it when i closed it a half turn, it became leaner?  thanks for the  quick response cheesy!

Quote from: weaselnozeso it when i closed it a half turn, it became leaner?  thanks for the  quick response cheesy!

when you screw it in, it makes it lean.  when you unscrew it, it's richer.


i would find it very odd that it was screwed all the way in from the factory.  unscrew it all the way out and make sure the little o-ring at the end (if the 250 even has one  :dunno: ) is still intact and that the needle-tip isn't bend

OK Kwak carbs are keihein, and the brass caps are actually aluminium (much better than GS brass caps) and they may have been screwed in because you were drilling through the cap. went through it and it screwed in the screw ...
The rest as cheesy said ... however you may need to adjust its valves, they are famous for eating intakes ...
Cool.
Srinath.

srinath, it sounds like u are exactly right about the drill bit going through and screwing it in all the way.  i also thought maybe they were just a lil stuck because of gas residue.  and ya i noticed they werent brass, i just said brass so ppl here might know what im talkin about .  thanks again guys.  i'll give it a whirl and let u know what we find out.

1 1/2 turns and it runs better.  runs w/ no choke but bogs a lot while riding. tomorrow we will turn it out another 1/2 turn and see what happens.  thanks for the responses guys

must look at the tach and see exactly what RPM its bogging at.

i didnt ride it much but i think its not so much at what RPM but when u open the throttle to much.

You can always go to Ninja250.org. They know EVERYTHING about the littlest Ninja. They're kinda to the little Ninja what GStwin.com is to the Baby GS...'cept they tend to be a bit ruder and more flaming. But they do have a good FAQ section. Just be prepared to get jumped on big time if you ask about the bike without looking in their FAQ section. Love the Baby GS, Idaho (best 'taters in the world), and this forum.

C.......

thanks C.  i'll look into it

2 turns should do it.  Might vary between 1 3/4 - 2 1/2.

well we've tried half turn incriments from .5 to 4 turns out and we cant seem to get it.  each time we have to pull the seat, tank, airbox just to get to them.  then pull them off to get to the mixture screws.  2.5,3, 3.5, and 4 turns out all have the same feeling.  lack of power.  bike tops out at about 75mph and feels sluggish.  anything below 2.5 turns the bike is obviously too lean.  gets real hot too.

If you think the carbs are good check the valves, air filter, igniter coils.  What year.  How old/miles?

I am experiencing the same problem. No power from idle to 4k rpm during my first ride of the season.

I am suspecting an ignition problem. Will keep you updated.

P.S. 1999 GS 500

Quote from: OniIf you think the carbs are good check the valves, air filter, igniter coils.  What year.  How old/miles?

valves would be the next thing to check i guess.  its a 94 with who knows how many miles.  not the original engine.    what do you check when looking at the igniter coils?  if they are putting out enough juice or whatever to the plugs? am i way off? haha

Make sure you have a clean engine.  No gas or oil on it.  Pull a plug but leave it attached to it's cable  and touch it to the engine block.  Give the starter a bump and you should get a good bright spark.  Wear some good gloves or use an insulated tool so you don't zap yourself.

thats it? just test for spark?  well i did that but i used my finger instead of the engine.  ya thats how i learned to test for spark from workin on lawnmowers lol