Maintenance & Technical > KX500 Original
Jetting!!! Again and again and again!
gowen:
Kawdude, I did decide to take the bike for a run after work today, (well yesterday now) and I noticed it sounded diffrent, more popping and just smoother revving. So, I decided to take it for a few runs slowly and no it still won't idle and no it still smokes, but it has cleaned the rev about 90% down low. I believe the stator has fixed the biggest problem I've been having, no responce! But, I believe I'm still rich down low and in the mid. I am going to try to drop the needle (raise the clip) and try playing with the air screw. BTW, I tried a 165 main and it is great. I'm not used to all the wheelies now. :-)
Anyway, I'll keep posted on cleaning the low up. I am still on a 52 pilot. Running center clip and a 165 on the main. I will check the air screw next. I'm still hoping to find an idle.
Thanks guys! I believe I've gotten the biggest problem fixed!
kawdude:
So what did dropping to the 165 do for performance? Is it cleaner? I'm at a 170 and it seems fine but rich.
gowen:
So far, dropping to a 165, I have not felt much improvement in power, maybe a slight bit, it does feel cleaner and less smoking up top.
Twist-a-grip:
Just to let you and Kawdude know, I too have experienced the lack of idle with my bike. Jetting is clean from bottom to top. No appreciable wear noted on idle screw or slide bottom, float and choke circiut OK. Idle srew turned all the way in and not quite enough for a good idle. The difference between mine and yours is my idle srew uses a lock nut instead of a spring. Well, as picky as I am I could'nt leave it that way. I went and purchased a 5mm X .80 X 40MM bolt that just happened to be the right size. I then ground the tip down to match the stock unit and I now have a good idle with a good amount of adjustment. If you try this please verify that you do indeed have the same size and thread pitch that I have to avoid damaging the the threads in the carburetor. If it is too long to use with the spring, simply trim the end, reshape and try again until the desired length is obtained. Before you do this however, get your jetting spot on first because you may not need this mod.
Just to let everyone know, Paul's jetting chart is pretty d**n close. After jetting my bike by the ride and feel method, I ended up right where the chart says I should be for my altitude and temp. I am running the fatty pipe but not the Vforce reeds.
Good work Paul!
gowen:
A NEW THOUGHT!! WHAT ABOUT TIMING?
Well, I took the beast out for a ride at a local called Buckle Berrys. I like that place cause they have a 1/4 mile dirt/sand drag and alot of open sandy land. I took it out for awhile and it ran great! Started 2nd kick (wow! it never started that easy since new) Well, here is the new beef, it had A TON of low-end (constant wheelies) but kinda weak top, would not rev too much, felt like a d**n 4 stroke. I started to race a 4 wheeler, plowed him like parked and the guy said to hold up while he gets his bike, he came back with a cr500! So, we took to a drag, with all low, he got the holeshot and kept a bike length, but all in all, we were even, it all depended on who got the holeshot. Well, I knew I should be eating this d**n little cr500, compared to a KX with all the work I've done and a stock CR. So, I decided I would play with the timing. On the stator, what marks are you guys running? I believe most KX500's have three marks, center is stock. Do most of you guys leave in the center?
I decided on retarding the timing to the third notch and took it for a run, it felt pretty much like normal, kinda quick down low, power shifted down low and it would punch in the mid and wouldn't rev much into the top. So, I then decided to try to go in between the 1st notch and 2nd (center), I took it for a few runs down the drag and it handled great it felt like the top-end had come back and would punch in the top, I decided I was quite happy with it and wanted to advance it to the 1st notch completely. Well, on the way back to my camping spot, the d**n flywheel key snapped (my d**n fault for not tightening the nut enough). So, that ended that. I will make sure to bring alot of them keys next time I make a run. Problem is that it is too hard to get out there (an hour away).
What do you guys think? Especially if you have a hard hitting, high reving 500, do most of you guys keep in the center of the stator?
BTW, advancing/retarding the timing has not helped the idling.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version