Messages

31

Technical / carb sputter...at a loss here.

« on: June 06, 2012, 12:35:57 PM »

TMKIWI, Thanks for for clarifying it. I wasn't sure. I haven't gotten it completely set yet. I got it to where it'll get fuel but runs out. So it'll come off again tonite for more R&D. What really ticks me off is the sputter is still there.

Then the kicker....Another guy showed up at the track, my son was practicing at, last night with a ...03 KX125...EXACT same problem. But he just bought the bike so he has no clue what jets are in it, etc.

After doing alot of internet searches, this is very common with the 03. Everyone talks about it and everyone recommends different solutions, but, NO ONE posts up what they did when / if they got it fixed. " title="Angry" class="smiley">

32

Technical / carb sputter...at a loss here.

« on: June 05, 2012, 12:42:01 PM »

OK, here's what I figured out last night. The float level according to the manuals setting was 10mm too deep. So I adjusted it according to the book. It didn't even allow fuel in. I was kicking for a min or 2, pulled sediment plug and it was dry. Went back, double checked measurement.

So then, I noticed that when the carb is upside down, the weight of the floats will compress the little pin in the needleseat. Not sure if that's supposed to happen. Weak spring in there??

So I easily tilted carb to the side, just enough for pressure to relieve off of little pin. set that to 9.5mm. Hooked up fuel line with carb level and got some fuel to feed bowl (I kept sediment plug out to see if fuel came out).

My dilemma here is, if I have float level too lean, I stand a good chance of leaning it out and melting my new topend. Too rich I just get the bog again. At least it's well lubricated.

The only other option I have is to try and track down, buy....whatever... the actual gauge used to set them.
This is Killing me. I want a Holley, DAMMIT!.

Update:
I found out after extensive interenet research, the small pin on the needel seat cannot be depressed. You actually have to  hold carb at an angle to where the floats are slightly released from pin but tang is still touching. So this means I'm about 2mm off. So, I'll be back at tonite after we get get back from a practice on the 250.

33

Technical / carb sputter...at a loss here.

« on: June 04, 2012, 03:49:15 PM »

Yep, gonna pull it off tonight after I paint the bathroom  " title="Angry" class="smiley">

But I found this. http://forums.mxtrax.co.uk/showthread.php?282219-kx-125-slightly-boggy

I have a manual too.      
Just didn't look at it that well. Being an 03 and having alot of time on it, I'm probably gonna need a new needle seat. This sucks cause I just put an order into Motosport about an hour ago for some parts.

34

Technical / carb sputter...at a loss here.

« on: June 04, 2012, 03:37:20 PM »

Some things I double checked last night with it still being on the bike. (Was working on another home project too). Choke bottoms out all the way because as I thread the plunger back down in, the knob/shaft comes up. Did another spray test, No air leaks. Choke still will not shut down engine.

I need to check float level but I don't have the right tool to do it with. That little measuring deal that threads in the bowl. Is there another way? I may try bending up the tab a little to see what happens.

35

Technical / carb sputter...at a loss here.

« on: June 04, 2012, 12:39:22 PM »

If I drop the clip or raise the Pilot size, it gets worse. The main is fine at 400.  It's gotta be in that choke circuit or something. I wish I had another carb to swap out and try.
I'd like to do a Keihen swap but that's more $$$ than it's worth for a stock setup.

36

Technical / carb sputter...at a loss here.

« on: June 03, 2012, 09:59:12 PM »

Air screw changes very little and runs best at about 1-7/8 out.

Glenn, I started with that jetting when we first put on the FMF pipe. I had to lean it out a little. It was running a little rich and spooging a little. Once I got it cleaned up and fought the sputter and moved the clip up, it ran great and zero sputter. Like I said above, it's worse than ever and moving the clip and and down makes a little difference and it's all the way up. If I do get another needle, Which one, there's 8 optional needles from OEM. I need to check the manual for which one is stock then research which way is leaner.

Why can't they use a Holley?!!! It'd be a whole easier.

37

Technical / carb sputter...at a loss here.

« on: June 03, 2012, 05:55:28 PM »

I need to look at needle but it's stock. Top position. If I go lower, it gets worse.

Right now for jetting, I have 35 pilot, 400 main.

38

Technical / carb sputter...at a loss here.

« on: June 03, 2012, 03:24:17 PM »

Since we bought 03 KX125 2 years ago. I've been fighting a bad sputter on the bottom. If it's on the pipe it runs hard and doesn't miss a beat. It has a hanging idle sometimes and it's is not an air leak. I've narrowed this down to the cable itself going into the top of the carb. If I move it, the idle drops back down. This bike has been rebuilt at least 4 times with new seals everytime si I'm sure it's not an air leak. I even did the carb cleaner spray down multiple times with no change.

Last year I had it fixed by moving the clip to the top position. Now, We just put it back together with a new topend and it's worse than ever. I changed all jets every which way...up, down & every in between. 

The kicker is, when I pull the choke back up, it doesn't kill the motor or even bog it. The idle will get higher. But it runs just the same as it is off. I've been through this carb twice, cleaning blowing it out, etc and gonna do it again tonight. The choke doesn't stick up anymore. It's wornout but does seat completly.

Any ideas from anyone??

39

General Two Stroke Talk / FINALLY, an industry insider (GP MEchanic) drops the Honda bomb. Straight up.

« on: May 28, 2012, 01:39:11 PM »

the earth did just fine without us for a billion years; volcanoes and all.

Haven't you heard the latest. Dinosaurs killed themselves with Methane gas due to flatulance. Yea, OK. Some scientists are complete I D ten T's...(Idiots). LOL they farted themselves to death.

40

Photos & Videos / 77 yz125 modern MX track.

« on: May 20, 2012, 05:04:09 AM »

speechless... thats a deathtrap  he's damn fast on that thing tho i'd like to see him in an actual race against modern bikes just to see peoples faces 

41

Photos & Videos / local pro on a kx250af

« on: May 20, 2012, 05:00:33 AM »

yea he's into that stuff i wish he woulda just left it with just the two stroke

42

Photos & Videos / local pro on a kx250af

« on: May 20, 2012, 02:40:07 AM »

heres one our local pro guys that was racing lites east in supercross real fun guy and loves the 2 stroke

43

General Two Stroke Talk / Rode an 80hp CR500 today.

« on: May 15, 2012, 03:56:46 PM »

You guys are hilarious. These 2 vids and comments will get y'all fired up. LOL

44

Open Forum / 2 stroke plate on Xtreme

« on: May 13, 2012, 09:08:01 PM »

Got my son a very nice 1999 S-10 Xtreme last Friday. We were thinking up some plates for it since all my cars have personalized plates of some sort.

I got him "2-STRKR". I thought up some other ones but that's the one he wanted since Ky only allows 6 digits (minus the dash). So when the plate comes in (3 weeks or so), we'll get some pics with the bike in the back. 125 is still in pieces otherwise we'd jam both in there.

Other cars are HOT LT1 on the 94 Impala SS, SLEPRZ on my dually which was passed from my 02 Z28...which was a serious sleeper. The the wifes new Chevy Cruze which sports the Combat Veteran plate.

45

Photos & Videos / chris blose 125

« on: May 12, 2012, 04:39:38 AM »

hey guys time to get pumped for chris ridin the 250 at hangtown so heres a vid of him awhile back on his 125 jsut try to ignore the music god knows i tried to.