Where did my wheelies go?
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Where did my wheelies go?
Hey guys... Did a little work today. I went from all stock to:
1997 KDX220R
FMF Woods Pipe
Stock Silencer
Boyesen 607 Reeds
150MJ/Stock PJ (Not sure of size)
Needle 2nd Clip from Top
(Edited) 49T Rear Sprocket
Those are the upgrades. It wheelied really well off the bottom before, and now it seems more linear. Is this normal with this setup? Seems like it should have amplified things... Plug looks chocolate brown at idle, and with a wide open plug chop. I have not done a plug chop at ~50% throttle yet...
Any ideas? Suggestions?
Thanks!
James
1997 KDX220R
FMF Woods Pipe
Stock Silencer
Boyesen 607 Reeds
150MJ/Stock PJ (Not sure of size)
Needle 2nd Clip from Top
(Edited) 49T Rear Sprocket
Those are the upgrades. It wheelied really well off the bottom before, and now it seems more linear. Is this normal with this setup? Seems like it should have amplified things... Plug looks chocolate brown at idle, and with a wide open plug chop. I have not done a plug chop at ~50% throttle yet...
Any ideas? Suggestions?
Thanks!
James
Last edited by thedeatons on 06:29 pm Jun 29 2010, edited 1 time in total.
- m0rie
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if you still have the stock PJ your going to be very rich on the bottom. Get a 40 and a 42 to try and see how it feels.
1989 KDX 200
2007 TTR-50E
2007 TTR-50E
- Indawoods
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Main sounds big for a 220 too.... still running the stock carb?
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****'95 KDX 200/****
"People ate cows a thousand years ago for the same reason we eat them now. Cause they are easy to catch.We're not savages,we're just lazy. A cheetah could taste like chocolate heroin. But will never know. Those bastards are fast!!! "
****'95 KDX 200/****
"People ate cows a thousand years ago for the same reason we eat them now. Cause they are easy to catch.We're not savages,we're just lazy. A cheetah could taste like chocolate heroin. But will never know. Those bastards are fast!!! "
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To clear up a few things....
#1 I do still have the stock pilot, and am not sure what size it is. I will check that out tomorrow.
#2 I am running the stock carb. Wide open plug chops in 3rd gear (after 5 seconds of wide open running at top speed in 3rd) show a great plug with the 150 MJ. I should add that I am in Boise, ID, at 2200'.
#3 I went from a (Edited) 47T to a 49T for a bit more low speed crawling with the kids. No way I can run a 145MJ. I tried a 148MJ and it was too white for my taste after the same style 3rd gear plug chop. I have not changed the PJ yet. I started with the clip in the middle position and it was not clean when revving. I moved the clip up, lowering the needle, and it seemed to rev out smoother.
***You know, it could just be my mistake on it. Off the bottom it does wheelie away, but I think I was getting on it at too high an RPM, excepting a lot more punch on top. That is probably the Woods Pipe keeping the top end away.....
James
#1 I do still have the stock pilot, and am not sure what size it is. I will check that out tomorrow.
#2 I am running the stock carb. Wide open plug chops in 3rd gear (after 5 seconds of wide open running at top speed in 3rd) show a great plug with the 150 MJ. I should add that I am in Boise, ID, at 2200'.
#3 I went from a (Edited) 47T to a 49T for a bit more low speed crawling with the kids. No way I can run a 145MJ. I tried a 148MJ and it was too white for my taste after the same style 3rd gear plug chop. I have not changed the PJ yet. I started with the clip in the middle position and it was not clean when revving. I moved the clip up, lowering the needle, and it seemed to rev out smoother.
***You know, it could just be my mistake on it. Off the bottom it does wheelie away, but I think I was getting on it at too high an RPM, excepting a lot more punch on top. That is probably the Woods Pipe keeping the top end away.....
James
Last edited by thedeatons on 06:30 pm Jun 29 2010, edited 1 time in total.
- Julien D
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- Colorado Mike
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I don't get it. You say you have a 39T sprocket. Stock is 47T, not 37. Pay attention to what jbowens is trying to tell you fer crine out loud. If you really do have a 39T and didn't shorten your chain, then there's your problem, the chain is wrapping around the kick stand or something and killing your power before you can even get to the bad gear ratio problem.
Mike
Life's tough, it's even tougher if you're stupid.
'04 KDX220
Life's tough, it's even tougher if you're stupid.
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FYI: Please read the post above.
I just pulled my PJ and it is a 42. I know the original owner of the bike and he never touched the carb. Perhaps the shop where he bought it swapped it out because we are at 2200'.... Regardless, I have a 42PJ.
I could try a 40PJ and see what happens. First I may try the air screw/PJ check:
"Turn the airscrew slowly in, and then out, until you find the point where the idle is fastest. Stop there. Now is the time to determine if you have the correct pilot installed in your carb. The airscrew position determines this for you, making it very simple. If your airscrew is less than 1 turn from closed, you need a larger pilot jet. If it is more than 2.5 turns from closed, you need a smaller pilot jet."
James
I just pulled my PJ and it is a 42. I know the original owner of the bike and he never touched the carb. Perhaps the shop where he bought it swapped it out because we are at 2200'.... Regardless, I have a 42PJ.
I could try a 40PJ and see what happens. First I may try the air screw/PJ check:
"Turn the airscrew slowly in, and then out, until you find the point where the idle is fastest. Stop there. Now is the time to determine if you have the correct pilot installed in your carb. The airscrew position determines this for you, making it very simple. If your airscrew is less than 1 turn from closed, you need a larger pilot jet. If it is more than 2.5 turns from closed, you need a smaller pilot jet."
James
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Okay, just did the test.
The mixture screw was in the exact correct position, at the beginning of the highest idle point.
With the 42PJ my mixture screw is EXACTLY 2 full turns out from closed (two turns counterclockwise from being all the way seated down).
This tells me my PJ is correct, and I know my MJ is correct from the plug chops I did in 3rd gear.
So... Looks like this is just the power characteristic this pipes is going to give me.
James
The mixture screw was in the exact correct position, at the beginning of the highest idle point.
With the 42PJ my mixture screw is EXACTLY 2 full turns out from closed (two turns counterclockwise from being all the way seated down).
This tells me my PJ is correct, and I know my MJ is correct from the plug chops I did in 3rd gear.
So... Looks like this is just the power characteristic this pipes is going to give me.
James
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Even at 2200 ft...I think the main is rich. I ride between 1500 and 2000 and my jetting was on at 142mj, 40pj, and the stock needle in the 2nd position. After I got the rb'd carb, which is bored to a 36mm my jetting is 150mj, 40pj, and a cek needle in the middle position. Granted the temp is around 95 F right now. I think you may have an air leak somewhere...spray some carb cleaner around your carb boots and see if that affects your idle. You may be right on with the 150mj, but something seems a little off.
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I am happy to report there are no air leaks...
I dunno what to tell you. Each bike is different. I am running no airbox lid, and a brand new No-Toil dual stage air filter, along with the new set of reeds and the pipe has just a few hours on it.
I would take pictures of plug chops with different main jets, but I will have to give the neighbors a few days to forget about the noise...
James
I dunno what to tell you. Each bike is different. I am running no airbox lid, and a brand new No-Toil dual stage air filter, along with the new set of reeds and the pipe has just a few hours on it.
I would take pictures of plug chops with different main jets, but I will have to give the neighbors a few days to forget about the noise...
James
- Indawoods
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I never do a plug chop for this reason...
I don't ride that way. I normally ride rough stuff at low R's and my jetting does not fair well by going by a plug chop.
I need grunt without all the extra gas in my cylinder when I am running in the woods.
This is why I run it the way it responds best for the conditions I ride in.
I don't ride that way. I normally ride rough stuff at low R's and my jetting does not fair well by going by a plug chop.
I need grunt without all the extra gas in my cylinder when I am running in the woods.
This is why I run it the way it responds best for the conditions I ride in.
*** Administrator //***
****'95 KDX 200/****
"People ate cows a thousand years ago for the same reason we eat them now. Cause they are easy to catch.We're not savages,we're just lazy. A cheetah could taste like chocolate heroin. But will never know. Those bastards are fast!!! "
****'95 KDX 200/****
"People ate cows a thousand years ago for the same reason we eat them now. Cause they are easy to catch.We're not savages,we're just lazy. A cheetah could taste like chocolate heroin. But will never know. Those bastards are fast!!! "
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I'm going to read this very thoroughly to learn a bit more:
http://justkdx.dirtrider.net/printcarbtuning.html
Then buy a few plugs and cut them up at various jet sizes... I don't really have anything else to tinker with right now, so it will be fun tuning the bike to its max potential....
James
http://justkdx.dirtrider.net/printcarbtuning.html
Then buy a few plugs and cut them up at various jet sizes... I don't really have anything else to tinker with right now, so it will be fun tuning the bike to its max potential....
James