kawazealand

hi,i bought my js550sx last week ,and to me it was tune but after a few times ride in the different days,it doesnt stay idol and very weak and slow on full throttle,also it dies if i give full throttle all of sudden,wondering if the carb needs adjustment,i was searching whole week on the net to find any information about how to adjust the carb which is Keihin cdkII 38mm but no luck.
would be great if somebody can help,
Thanks in advance

98yota

Welcome to the forum! Sounds like the carb needs to be cleaned and rebuilt. It only takes a small piece of debris to cause havoc. Are at the same altitude as where you bought it? A major change in altitude will require rejetting the carb.

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1993 Yamaha WaveBlaster 701
1989 Yamaha WaveJammer 500

kawazealand

thanks for reply,
yes in the same altitude ,i bought it hear in Auckland NZ,and the guy was using it before,all the stickers on the body is in Japanese,to me if its imported probably the jets should been replace in one stage,
so i need to get the a kit to rebuilt the carb,but do you know how to adjust the high and low screws on this model.
another thing is a little bit smoke coming out around the water box wondering if it makes any difference.
thanks

kawazealand

yes your right,clean the carb to day,was some stuff like paste, white color in there,adjust the low screw so its running well on idol,but still if i open the throttle it dies,play with the high screw but couldnt find the right spot,ill take it for a ride tomorrow,it might be better when engine warm up,to find right adjustment,or if you guys know how to adjust that would be great,
another question,is there any part that i need to put grease in,Thanks

kawazealand

please help,any body have any idea about adjusting this carb?

98yota

You need to fix the waterbox, the exhaust gases in the engine compatment can choke the engine out. I had this happen on a js550, once I repaired the waterbox it was a completely different machine.

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1993 Yamaha WaveBlaster 701
1989 Yamaha WaveJammer 500

kawazealand

hi again,
the carb adjustment might be 1,1/4 and 5/8.
ok first one means 1 and a quarter turn out,
what about 5/8 ,i couldnt figure it out .
thanks