357xp spurtin fuel

[teatersroad]

Hello folks, been awhile. Been off the saws, I'm a little rusty. Could someone remind me what might be the cause of this: I rebuilt the carb and replaced the intake boot. I leave the saw in a cool place, on the floor. It pushes fuel in to the cylinder and out the muffler. Through the impulse line or venturi I cannot tell, but it will drain the tank given enough time. Tank vent? Ham-handed rebuild? Anyone with similar scenarios that would help? I appreciate it.

Hope all has been well. I'm stepping away from the computer but I'll be back this evening. - Eric

 

[Chris_In_VT]

Metering lever set too high or the needle is stuck sounds like.

 

[bikemike]

Metering lever set too high or the needle is stuck sounds like.

I concur simple little issue

 

[teatersroad]

Bingo.. of course, thanks. I thought I was careful in setting it, but I did not mention ham-handed without cause. Might be buggered up one way or another, I'll get back with the results, regards.

 

[teatersroad]

Yeah, well. Nothing worked. Set and re-set.. cleaned and re-cleaned.. two new needles. Still dumping fuel. It's the 357xp with a Walbro, there were historic issues with that carb model for those saws, this one never had those issues - ran great for years. I threw up my hands and just ordered a new Zama carb.

To be clear, the fuel was dumping in to the cylinder, through the carb.

 

[sunfish]

There are two kits that fit the walbro 199, a right one & a wrong one. You likely got the wrong one. I can't think of the numbers right now. The Zama will fix it, but the Walbro is the better carb...

 

[øystein]

Check your flywheel key.
That could be the issue, has happened to me a couple of saws!

 

[teatersroad]

There are two kits that fit the walbro 199, a right one & a wrong one. You likely got the wrong one. I can't think of the numbers right now. The Zama will fix it, but the Walbro is the better carb...

I sure wondered more than once if they gave me the right kit (K22-HDA for the HDA198A), the needle is not visibly different than the old.

It is not the flywheel key, I've had that happen on huskys as well. Not a key to speak of, just an aluminum bump for alignment. The timing on this saw is fine, it runs great until you give it time to flood itself to the gills.

 

[272super]

Maybe a long shot but if your new diaphragm does not have the vent hole,it might be causing some sort of vacuum issue that is not allowing the needle to properly seat. The wrong kit will not have the hole and you'll have to make one. Something to check out because it won't run right either, unless the vent hole is there. The hole sits right below one of the mounting screws.

 

[teatersroad]

Maybe a long shot but if your new diaphragm does not have the vent hole,it might be causing some sort of vacuum issue that is not allowing the needle to properly seat. The wrong kit will not have the hole and you'll have to make one. Something to check out because it won't run right either, unless the vent hole is there. The hole sits right below one of the mounting screws.

Well, that sounds completely plausible..and fits the symptoms. I don't know if I've seen a hole in the diaphragm before. There was not one in the two kits I have here for this carb, or a couple others here I have for other saws. So, put a hole in the diaphragm? About the size made for the alignment pins? What is odd is that this carb does not have a hole in the metal cover for the diaphragm, the half dozen other carbs I have here do. So, presumably it's one way or the other, where I have neither. (I tossed the old parts long ago, now I know to compare and contrast first)

 

[teatersroad]

Well, that sounds completely plausible..and fits the symptoms. I don't know if I've seen a hole in the diaphragm before. There was not one in the two kits I have here for this carb, or a couple others here I have for other saws. So, put a hole in the diaphragm? About the size made for the alignment pins? What is odd is that this carb does not have a hole in the metal cover for the diaphragm, the half dozen other carbs I have here do. So, presumably it's one way or the other, where I have neither. (I tossed the old parts long ago, now I know to compare and contrast first)

Ahh! I see it. The hole is in the carb block, ported (from the impulse line?) into the backside of the diaphragm chamber, and until now blocked by the diaphragm. Now I wonder if that Zama would run on my ported 346, because I really need more projects and an over-powered 50cc saw.

I'll get at this fix and get back at you guys, thanks.

 

[sunfish]

Well, that sounds completely plausible..and fits the symptoms. I don't know if I've seen a hole in the diaphragm before. There was not one in the two kits I have here for this carb, or a couple others here I have for other saws. So, put a hole in the diaphragm? About the size made for the alignment pins? What is odd is that this carb does not have a hole in the metal cover for the diaphragm, the half dozen other carbs I have here do. So, presumably it's one way or the other, where I have neither. (I tossed the old parts long ago, now I know to compare and contrast first)

Drilling a hole in the diaphragm cover on a 199 is part of the 'fix' for these carbs. You might try it and see if it fixes it?

 

[teatersroad]

Drilling a hole in the diaphragm cover on a 199 is part of the 'fix' for these carbs. You might try it and see if it fixes it?

Thanks, It's no doubt easier than cutting a tiny hole in butyl, with old eyes and a buck knife. However, since that port is powered by the impulse line I think I will try that first.

 

[teatersroad]

Thanks, It's no doubt easier than cutting a tiny hole in butyl, with old eyes and a buck knife. However, since that port is powered by the impulse line I think I will try that first.

Scratch that, it's not ported to the impulse line. Looks like the thought was to have that vented space filtered, noble I guess, but sort of a PITA if you don't know.

 

[old-cat]

Send the carb to me, I'll fix it n/c and show you what's the deal.

 

[teatersroad]

Send the carb to me, I'll fix it n/c and show you what's the deal.

Thanks, it's not that bad. I just haven't been around saws for awhile, picked a stupid little head scratcher to get back at it. I can't think this won't fix it, I see what's going on now.