MY ZX50 O.E.M CARB TUNING

[sidthesloth]

With mine, on these cold mornings, she splutters over 3/4 throttle until warmed up, have been tempted to down jet, but is ok after a few minutes so I just leave it as is, for now.

[thebatman]

thats just it...THERE ARE NO CHANGES ANYMORE...HAD TO GO BACK TO SQUARE ONE, REMEMBER...   i jetted to .965, plug still as snow white as when i took it out of box..slower today too...even the fkn 5.7 rollers arent as revvy as 2 weeks ago..

[art]

  Hmm! Make sure you have oil flow to the mix. It don't quite make sense    Got to try to go ritcher if this is a constant result.

[thebatman]

already 2 size jets bigger with no results from the nice tan plug i had 2 weeks ago.... seriously, imma about to give up completely...STILL cant get any take off

[art]

  Your take off is controlled by air idle,pilot and needle,your main does'nt kick in till 1/2 throttle or more.  Try to shut the thing down at wot for a plug check to see how your main is acting.

[thebatman]

uhhhh art...did you not read any posts??..i did 3-4 chops yesterday...each jet bigger, each plug snow white.....thats why i asked about going smaller on the jet, id say shed slow down with a smaller jet but dam, where did my nice plug go..that plug was snow white, shouldnt have been tho, WASNT 2weeks ago.      .........if thats the case, then i will never have any take off..pilot non touchable.....a bigger carb may fix take off then...imma ruin this belt, could tell that today....BAD tug,jerks...

[thebatman]

oh sid, i almost forgot...i looked at that reed cage/intake link for the one you run.....i do like that alot BUT just like the one shaka runs, i still have the oem carb...those intakes wont accept my carb..i have a flanged out/wide with bolt holes...would be nice tho...shaka had said that the oem carb would bolt up buut idk how when your carb is held by a clamp(just like the air filter side), mines by a bolt.. dam nice price too.   even cheaper than shakas but his came from mh.

[art]

  I wasn't sure if you did the chops at wot,my thoughts here are possibly really lean on needle and pilot,so it might be  cleaning the plug once you let off the throttle.

[thebatman]

yeah, i did all chops at wot, shut her off. bam, snow white...a few weeks ago i had a good plug. this weekend has been in 70s instead of high 80s tho..dont really get the concept of "down jetting" tho either...thank the lord she hasnt died out yet.    when i was jetting tho, the fuel was free flowing even with a new petcock, didnt die out tho..idk    this sh** is getting so dam aggrevating dude, especialy since i cant drop $500 into parts and work,and labor for somebody to show me where im fkn up...now i cant even get her back close to right..never been right but dam, i was getting close..i think anyway, probably not since my scoot is the only one on earth that has always had sh**ty takeoff.

[art]

      Ha! Wish you were close, all i can say is If it shows lean bigger jets, double chek the oil flow!!!
 Try putting a few more miles on those plugs to see how they burn in. Seems something is missing just can't tell over the interweb 
  I hear ya on the aggrivation But it go's with the modding got 5 I'm dealing with and never seem to be satisfied,just got to keep trying  What ya realy need is a backup scoot! makes it a little more talerable when one is down.
  Just to back track seems the problems started with the petcock and the seafoam,all that should be taken care of at this point so, Something going crazy with the what? Guessing air or electric. To make things run too lean I would have to say air flow or vacuum. Maybe try choking down your air filter? Carb just cant keep up with demand?

[thebatman]

just seems crazy that the jet from 2 weeks ago was good, now almost 2 sizes BIGGER and still snow white plug, dont even see how she is running cuz before, at THIS jet she bogged hard,ran slow,sh**ty....i only wish i had a aftermarket carb/intake, reed cage..the plug WAS good, nothing has been changed....i have the 14mm carb, was better than this. cant tune it much anyway but at least i had a nice mix ring, not a snow white plug..??    of course i didnt have any vaccum fron the petcock but sh**, it stopped her from dying out evidently....idk about that crap either, but i have to have sone vaccum somewhere or the dam thing wouldnt run, i wouldnt think...

[sidthesloth]

Gday batman, you can get that inlet with a carb for $125. With the plug, still try upjetting, if it is not bogging then you can keep going. Does it break down at high speed? I have 50mm piston, 24mm carb and 4reed cage, my take off is still crap, word and art are getting as good or better, yes, I know frustration.

[thebatman]

good morning sid....i thought i had seen a carb in one of those sets, i do think a 21+mm carb would be way to big..im thinking 17 would be good.......thank the lord you have sh**ty take off sid.sorry but at least maybe i am not too dam crazy...dont see how tho with those mods.........shaka and z swore they both had great takeoff.........is/was your exhaust port taco/halfmoon shaped?  shaka had said his was round, the zx dont have the taco yshape...MINE DOES....04 model,..maybe the intake opening is our problem??? yeah, this does get soooo dam frustrating these days, a back up scoot may help tho..             see thats whats getting me........why can i get so big on a jet today but 2 weeks ago, that jet would bogg it down, but not today and no changes to it......THAT PART ALONE IS BOGGING MY MIND.....HOW IS THIS POSSIBLE?...NO MODS to need a BIGGER jet... no sid, she didnt die out at all yesterday, thankfully..  yeah, oil flow i guess is good, dam sure leaving the tank anyway

[sidthesloth]

G'day batman, have you tried upjetting to the point of bogging since doing your reed cage, I wonder if that would make a big enough difference? If you have a spare jet drill out the one you are playing with and keep going until you start to bog, if need be, you can put your spare in until you adjust the other, though I know it is a royal pain with those stock carbs. A 19mm carb might do you well and still be useable if you do go with a cyl. kit in the future. Zombie and Shaka had a lot better quality gear than I have and they also had good quality variators and clutches. I don't remember if my stock cylinder had a round exhaust port or not, I know the outside is round but don't recall the inside shape, my current one is oval inside, round outside.

[sidthesloth]

If you are getting a better airflow, you will be able to go up in jet size.