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Runs like $hit after a half hour or so


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I clean the filter change the jetting, run it a couple times up the street and it runs great. Revs clear throught the powerband and everything. I go to the trail and it will run good for like half an hour and it starts sputtering like its getting watter in it. (its not dry as hell out). It breaks up and makes like a (buuurrrrrr) sound and occasionally making a normal sound back and forth if you can imagine that. If I burry the throttle in gear under load if makes the burr and never clears up. It will get so bad at times that the only way I can ride it is to bearly be on the gas and let it slowly clime the RPM'S. It seams to rev more freely in nuetral but it still sputters a bit but not as bad as when I'm going. I get so mad at it I just want to keep the throttle pinned and blow the f*cking thing up but it just goes buuuurrrrr sputter burrr.

 

I dont get it. I thought the jetting was off and I was fouling plugs, but if I change plugs real quick at the trail it doesnt change. It runs so bad that Ill end up with oil all over my pipe ends. I cant figure this out I come home and in a day or so Ill clean everything filter and all and it will rev clean and run real strong again for the 1 minute I can run it on my street. Ill put it away thinking its fix then go riding again and same shit.

 

I had this problem for a while and I dont know what to do. Ive changed CDI, Coil even though the first one tested good. Im running a 200w stator from RS. Which they said tested good but sent me a new one that tests the same and does the same shit. Ive even changed the wireing harness. I still think it may be the RS 200w unit. What do you guys think.

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I dont get it. I thought the jetting was off and I was fouling plugs, but if I change plugs real quick at the trail it doesnt change. It runs so bad that Ill end up with oil all over my pipe ends.

 

You sure it's not a jetting issue? What did you do to the jetting? What mods/circumstances made you change it? Have you adjusted the airscrews at all?

 

May be something completely different (like the stator as you suspect)...excessive (like dripping) oil at the ends of the pipes is an indication it's not burning the fuel completely, which could be from rich jetting or could be from ignition (lack thereof). Another thing is you say it runs great for a little while right after you clean the air filter, but then hit the trails and the problems start...like once the air filter takes in a little dust it's suddenly TOO rich...or else the heat is creating an electrical issue. Strange.

 

If it was mine I'd rule out jetting first; adjust airscrews and see if it changes, maybe mains depending on what they were or what you did to it. If you've tried that or are certain it's dialed in...are you sure there's no exhaust obstructions? Reeds ok? Carbs getting fuel? Almost sounds like it's starving for fuel, or vapor locking the fuel tank, your vent hose ok?? You confident the 200W stator is wired right?

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Well I woke up today and put fresh plugs in it and took it up the road and it's still doing it. I have had oil on the silencer ends since I built this motor but Ive had this problem on and off since I built it too. Ive tryed every jetting change I could think off. If I go leaner on the main it gets zingy so Im content with where it is there. I was lower on the pilot and it seamed to run good but I had to keep the air screw at 1/2 out. If I went further out the RPMS increased but when I stab the throttle it bogs. So I went one size bigger on the pilot and it does the same thing bogs if I go any further then 1/2 out. I said screw it and just took extra plugs and went riding. I dont know, it would rev clean and hit the power band clean at my house then when I go riding after a bit it wollnt do shit. It sounds to me like a bigger pilot right but my plugs are wet and black. just dont make sence to me. Oh and my filter is clean a day after riding.

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I clean the filter change the jetting, run it a couple times up the street and it runs great. Revs clear throught the powerband and everything. I go to the trail and it will run good for like half an hour and it starts sputtering like its getting watter in it. (its not dry as hell out). It breaks up and makes like a (buuurrrrrr) sound and occasionally making a normal sound back and forth if you can imagine that. If I burry the throttle in gear under load if makes the burr and never clears up. It will get so bad at times that the only way I can ride it is to bearly be on the gas and let it slowly clime the RPM'S. It seams to rev more freely in nuetral but it still sputters a bit but not as bad as when I'm going. I get so mad at it I just want to keep the throttle pinned and blow the f*cking thing up but it just goes buuuurrrrr sputter burrr.

 

I dont get it. I thought the jetting was off and I was fouling plugs, but if I change plugs real quick at the trail it doesnt change. It runs so bad that Ill end up with oil all over my pipe ends. I cant figure this out I come home and in a day or so Ill clean everything filter and all and it will rev clean and run real strong again for the 1 minute I can run it on my street. Ill put it away thinking its fix then go riding again and same shit.

 

I had this problem for a while and I dont know what to do. Ive changed CDI, Coil even though the first one tested good. Im running a 200w stator from RS. Which they said tested good but sent me a new one that tests the same and does the same shit. Ive even changed the wireing harness. I still think it may be the RS 200w unit. What do you guys think.

 

Did you check your gap between the pickup coil and the flywheel? Maybe its to big a gap.

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Ive checked the gap a few times with a feeler guage and its good. I can check the fuel tank I doubt its that. As for the pilot being cloged I will check that as soon as I get a chance. I feel like I have a spark that gets weak or is weak. Or maybe it gets weak from something as it gets hot. I dont know what to say. I just dont think my jetting is so rich that it is just fouling up. pilot is 45 and main 155 cel middle is jetting 1000ft 80 degrees . Should mention I run a K&N with the air box and no lid. I just find it hard to believe my jettin is so off that it wollnt run right

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Did your bike run like that before you put the rs stator on? Ive had nothin but problems with them. :down: So does it only do it when warm or all the time? If it only does it warm you could ohm the stator cold then get your bike nice and warm and ohm it again. If you can get your hands on a stock stator definitely try it.

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  • 2 months later...

Get a USED stock stator and put it on. This does not sound like a jetting issue... WHen a bike heats up, electrical problems arise.

 

Are you losing any coolant?

 

Pull your flywheel off and shake it like a maraca....you should hear NOTHING. If you hear something jingling around inside the flywheel, replace it.

 

After two stock output Ricky Stator stators on my drag bike (read, no rain, mud, etc.) in two years, both dying just before the year warranty was up, I threw the last one in the trash. Didn't even bother calling for a warranty or refund. That fed up.

 

I got a rusty, old, beat up looking stocker that is running like a champ on there...

 

And as said, check your flywheel gap. .015 to .018 is where I like to run mine. Also check wires on the bike for fraying or bare ground out wires.... Bypass kill switches if you can, too....

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