Carb options for 357xp (other than Zama)

[RIDE-RED 350r]

OK, so I have recently been clued in to the little accelerator pump conundrum with the Walbro HDA carbs found on the 357xp and others...

This question pertaining to the 357: Is there any another option besides Zama when it's time to swap out the HDA due to a bad accelerator pump piston that is NLA?

More specifically, is there a Walbor that doesn't run an accelerator pump that can be used?

Anyone ever run a 372 carb on a 357?? Is it even possible?

Sorry if this is a dumb question... This bugs the hell out of me that an otherwise good carb can't be fixed because such a small and easy to replace part is NLA....

Or am I making a big deal about nothing?

 

[Deererainman]

Have you tried the @tree monkey fix with repair kit K24HDA?

 

[RIDE-RED 350r]

Yes Sir...gave my 199 the full Treemonkey treatment and it runs good now. But as far as I can recall, the Treemonkey fix doesn't contain a fix for the accelerator pump when it goes bad..

 

[redtractor]

How do you narrow down carb problems to an accelerator pump? Is it a case of ruling everything else out? Any red flag symptoms?

 

[RIDE-RED 350r]

Pretty much by ruling everything else out. I put a complete carb kit in, and triple checked that the carb was clean. Then in the case of an EO 346 I was working on, I swapped in a carb from a good running 346. It was when I narrowed it to the carb itself that I was informed about the accelerator pump likely being the culprit by members here. So far there is no fix for the pumps due to the fact you cannot buy the pump parts to replace. But I did contact Walbro corporate requesting they make the pump service kits available and they said they would consider it... Here's hoping.

 

[Deererainman]

I have a 357xp on the workbench right now that I'm waiting on the repair kit for. Definately looking forward to cutting some firewood when I get it running the way it should.

 

[RIDE-RED 350r]

Well, if the full Treemonkey treatment doesn't cure your carb issues, and assuming everything else with your saw is in good order (IE: crank seals, intake boot, base gasket if applicable) then it's a pretty safe bet that your accelerator pump is bad.

As I said above, Walbro has not yet made the accelerator pump service parts available yet, but has stated they will certainly consider it when I contacted them requesting they make them available. Until they come available, a new carb is the only sure repair solution that I know of.

So if your accelerator pump turns out to be bad, and your 357 is stock or close to it, you can replace your HDA199 with a Zama carb, part number C3-EL42 if I'm not mistaken.

BUT if your 357 is modded or you intend to mod it, I have seen it said by quite a few reputable folks that the Zama replacement carb will not adequately feed it. I would then buy a new Walbro HDA198 instead.

The Walbro is more expensive by $20-$30 in most cases.

But whatever you end up doing, don't toss out your old HDA199 just yet... I am hoping more people contact Walbro in regard to the accelerator pump repair parts and they make them available to us. I just can't get past tossing an otherwise perfectly good carb into the trash for the sake of $3 worth of accelerator pump parts and a brass plug!

 

[lwhaples]

Good read,I've been buying the HDA199 as take offs from the dealer.The owners son picks them out of there used carb box when he thinks of it.

 

[RIDE-RED 350r]

The HDA199 on my 357 just needed Treemonkey-ing. Runs perfect now.

For the few dollars a carb kit is, don't condemn an HDA for a bad accelerator pump until you do a kit and verify everything else is in good order.

 

[XP_Slinger]

I think our carbs will be ok for many many years. IF they do go bad, we'll just replace them with bigger ones

 

[RIDE-RED 350r]

Well, there's that too! LOL!

 

[sunfish]

I have a hand full of hda199 carbs on 346's, 357s' & 359s' all running fine.

I also have a hda 191 on a 346xp & was told it's same as a 199, but without the accelerator pump. Can't confirm this.

 

[cobey]

I bought a hda 198,
I haven't got it in my hands yet

 

[Tor R]

I have a hand full of hda199 carbs on 346's, 357s' & 359s' all running fine.

I also have a hda 191 on a 346xp & was told it's same as a 199, but without the accelerator pump. Can't confirm this.

well, since they are similuary build you can figure it out if the 191 have brass plug or not. Far as I know the acc pump is placed on just one place...

 

[Simondo]

Pretty much by ruling everything else out. I put a complete carb kit in, and triple checked that the carb was clean. Then in the case of an EO 346 I was working on, I swapped in a carb from a good running 346. It was when I narrowed it to the carb itself that I was informed about the accelerator pump likely being the culprit by members here. So far there is no fix for the pumps due to the fact you cannot buy the pump parts to replace. But I did contact Walbro corporate requesting they make the pump service kits available and they said they would consider it... Here's hoping.

One little nugget of info that could help on the "Dreaded Accelerator Pump" is a symptom that showed up on one that was starting to go. You get the saw running and it needs just a little more on the L side than you would think ..But.. you set it up none the less. Off you go to test it out and all seems pretty groovy. The next day you pick up the saw and stroll confidently to the wood pile full of joy that you have got a good running 346 xp …Uh Uh..idle is all wrong from where you Tached it to yesterday !! What The F@@@ , this is mad as the settings haven't moved ….you paint marked the carb and idle screws. There you have it , or I should say , "There I had it " ! Early Pump Madness Syndrome

 

[redtractor]

One little nugget of info that could help on the "Dreaded Accelerator Pump" is a symptom that showed up on one that was starting to go. You get the saw running and it needs just a little more on the L side than you would think ..But.. you set it up none the less. Off you go to test it out and all seems pretty groovy. The next day you pick up the saw and stroll confidently to the wood pile full of joy that you have got a good running 346 xp …Uh Uh..idle is all wrong from where you Tached it to yesterday !! What The F@@@ , this is mad as the settings haven't moved ….you paint marked the carb and idle screws. There you have it , or I should say , "There I had it " ! Early Pump Madness Syndrome

That behavior would've had me chasing a nonexistent air leak. Hair loss what it is, I can't go pulling more out.

Good thread.

 

[Simondo]

That behavior would've had me chasing a nonexistent air leak. Hair loss what it is, I can't go pulling more out.

Good thread.

Do i sound traumatised by the experience ?? Yup . The air leak was tested for and nothing showed up as you suggested …But.. as the idle was a Drop in speed not a increase it took me down a different path ether over fuel or under fuel. The pump system taking the place of part of the L side of the metering/running circuit gives inconsistencies you don't have to eliminate on non pump carbs. The work of Beelzebub !!

 

[redtractor]

Is any other feature capped with a brass plug or does that plug always mean that there is an acc pump? And is it always brass, not a regular welch plug or something?

 

[Tor R]

Is any other feature capped with a brass plug or does that plug always mean that there is an acc pump? And is it always brass, not a regular welch plug or something?

good question
Far as I know it's throttle regulated, and on hda182,199 the brass plug is very close to the impulse line.
I also have one 350 carb, hda195, that one doesnt have the pump.

 

[Simondo]

Is any other feature capped with a brass plug or does that plug always mean that there is an acc pump? And is it always brass, not a regular welch plug or something?

I go with Tor on this one…Yes...The pump is moved by the throttle Butterfly stem rod as you pull the trigger . Tor has looked over many more Husqvarna Carbs than me so will have a very good idea of the ones that have them in.