Maintenance & Technical > KX500 Original

Jetting!!! Again and again and again!

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gowen:
Hi Kawdude, I appreciate the info. Yeah, if I close the idle screw, it does not surge. Just with the screw all the way in about. :-) I will keep with this carb, but I was just planning on changing the carbs and keep the same slider, needle, float, jets, ect. ect. just thinking the carb might be toast or busted some how or another. Just wondering, they both are PWK39mm or whatever is stock. :-) So, it should not knock the jetting off I don't think, should remain the same. I hope.

The needle, I did check that, it seems to be working fine, I am not leaking fuel from the carb, except when I lay the sucker on it's side. I still have the 52 in there. But, I'd like to mayme try dropping to like a 30 and see if it idles then, I know I would never ride the bike with it that low. But, just for experiment purposes. I'm thinking maybe I have serious blockage in the carb and the cleaner is not letting it out. Because of the fact that forcing air in the carb, removing the air screw, AND removing the air filter is not helping at all, except maybe a few puffs of life. Adjusting the float did help the smoke, but did not seem to help the idling.

I'm sorry, I know I ramble on, but I really want to overcome this.... I don't want to give up.. I hope you don't mind me rambling on your forum Paul.

As far as riding though, idling is not stoping me. I am going to change the other carb into an experiment carb and keep the one on the bike for riding. :-) just change them out when I want to do serious riding, not trails. I really need a stretch of land to ride on, right now, just got about a short 400ft dash down some powerlines, but hills and smoothness helps alot! Just wheelies through the 3 gears I can run before running out of room.

I think cutting the springs was a good idea, but even though it idles now, it does not idle very long, it puff puffs and then dies eventually, but I can now pull in the clutch without it falling flat on it's face.  :lol:

I think I will try to change the carb, using the same jets and see if that helps, if not, I'm going to order the smallest few jets (30-40) and just try to find an idle the right way. I think I will go ahead and order a float adjustment tool, it costs like $19, but it's the shipping that gets me, I just wish I could find one now. I hate to wait for something I want done now.

But, my friend, the testing is yet to be completed.. I will try not to give up. I wish I could test another bike other than my only kx that runs. But, so it goes. Somebody has to do it. I would other bikes that I have, but they all IDLE!!!!!!!!!! grr.. The KX is the only one that has idling problems, I think I will have the crank pressure tested. But unsure how right now.

I won't be able to test tomarrow, but I can saturday evening and all sunday!!  :mrgreen: It's actually kinda fun to do this, but sometimes a PITA, especially when you feel at your whitsend. But, I have alot of ideas to try, I will pick up jets tomarrow while out at lunch. I am going to purchase all the jets between 170 and 182. I will also try and pick up the smallest pilots (30? if less will get them, from the smallest to like a 35 or whatever is close.  Then will pick up a 55. Just incase I find it is something else, I will never run anything other than idling for testing, not worth my motor. Just incase you guys were thinking I was sacrificing a motor. I'd not worry as much if I knew Eric Gorr had extras, but as we talk, it takes MONTHS for the motors to return.....

Kawdude, keep me posted, I appreciate your input, it helps me think and gives me ideas, I will also let you know as I progress and keep posting as I think. (as long as Paul lets me. :-) )

Paul:
Hey man spread the love, that's why I chose the type of forum I run here - SQL database backend type - to store large amounts of information for very long amounts of time ;) . We're here to help each other out, don't worry about how long a post is, we'll git 'er dun :lol:

YUNGGUNNAZ:
gowen,have you done a compression test yet if so what #'s did you get.
also a plug check.just to make sure everthing is ok up top.then to see why it aprears there low vaccum.fresh motors some time screw up or riders.when i do my motors crankcase seal is a priority.

gowen:
Hi Younggunnaz, I have yet to do a compression test. I will run one when I can get back to the lab  :lol:, er, garage. I did have the entire engine rebuilt at the same time, crankshaft (new), new crank bearings, new crank seals, new trans bearings, new trans seals, new shift forks, ect. ect. But, I understand that sometimes motors just screw up and mainly two strokes. I have to put this on the shelf until tomarrow, being Saturday evening, due to the fact that I have to make a trip to VA in the am to pick up a cusin. Then, be back for work, then I can hit it again.  :lol:

Anyway, thanmks again for the inputs. I'm thinking I might have low compression but...  :shock: d**n, that baby is hard to kick and it has not changed since I got it. But, who knows.

I had a thought, I was thinking a while back, before I changed the stocker pipe for the FMF, that I was out riding and I had the stock pipe crack right down the front and almost nearly fall apart, with a huge hole in it, it idles and pretty high! without running out of gas, I just remembered that. Maybe I need to check the KIPS operation, I imagine if it is stuck open it would also cause issues down low. I was reading the service manual like a bible last night before I went to bed. SO, I have a few ideas to brew and mix together.

Sharc:
Gowen - good idea. With all the jetting combos you've tried and strange results it makes sense that something like a stuck KIPS could be the reason. Good luck and nice work on being persistent...!

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