mac pro 10-10 auto gas in exhaust

[poppiecarver15]

thanks for the info. on removing the brass insert. i will need to order a new carb. kit as i do not think i can get the welch plugs out without ruining them along with a new check valve kit. now i wish i had just left the saw the way it was as it would run good most of the time before i started monkeying with it. it seem s to have good compression when i hold it by the starter cord and let it hang down. will get the kits ordered and go form theregie my arm a rest from pulling on it.thanks again for the help, well get it going yet i hope

 

[poppiecarver15]

question is the check valve kit 86-532 or 86-523 i found a kit 86-523 0n ebay just want to make sure it is the right one??thanks

 

[fossil]

The PN according to the Walbro site for an SDC 37 is 86-532

I believe you get the welch plug, brass bushing with screen and clip and the rubber flap.

Try these guys https://www.jackssmallengines.com/jacks-parts-lookup/part/walbro/86532

 

[poppiecarver15]

thanks for the info . Tim.just an update i let the saw sit for a day no prime ,pulled twice on choke and started saw on half choke then pushed choke in it ran but only in Wot. i could not get it to idle and then saw quit. would not restart. when it was running it was still getting gas in exhaust and on the ground it turned the grass black and was wet,hope this helps but will get a kit ordered,thanks again

 

[fossil]

Bad check valve lets gas through all the time . It looks like the check valve is the culprit.

I hope that's the case so you can get it running again.

 

[Binthewoods]

thanks for the info . Tim.just an update i let the saw sit for a day no prime ,pulled twice on choke and started saw on half choke then pushed choke in it ran but only in Wot. i could not get it to idle and then saw quit. would not restart. when it was running it was still getting gas in exhaust and on the ground it turned the grass black and was wet,hope this helps but will get a kit ordered,thanks again

I'm working on a Mac 10-10 that does the same thing. I just ordered a check valve kit too. Hopefully we both get them fixed

 

[poppiecarver15]

got mine ordered also good luck hope we both get them running also

 

[poppiecarver15]

well it will be a bit before i can do anything my check valve has been back ordered,but will post when i get it installed and tried Tim thanks for the place to order Jim

 

[GoBigRed]

well it will be a bit before i can do anything my check valve has been back ordered,but will post when i get it installed and tried Tim thanks for the place to order Jim

The best I have found for complete carb kits is discount marine parts. Plug that in to your search and they come up. Lots for everything and all parts included. Not to mention a complete parts diagram with your orders.
Yes, they are a little expensive, but it’s all there and they know their stuff. Every SDC kit comes with the check valve pieces.
I struggled with issues like you are talking about and finally decided to pop those Welch plugs and replace the check valve. I’ve heard they hardly ever need replacing but I’ve had to do this on three carbs. Once fixed, the saws run perfectly

 

[poppiecarver15]

thanks they said my check valve should be coming soon but if not i will check them out,i sure hope that is my problem ,i might have damaged it when i changed the welch plug the first time,keeping my fingers crossed.thanks again

 

[Maintenance supervisor]

thanks they said my check valve should be coming soon but if not i will check them out,i sure hope that is my problem ,i might have damaged it when i changed the welch plug the first time,keeping my fingers crossed.thanks again

The fact that you've been through with the rest of the carb pretty much narrowed it down.
The only other thing that will drowned out a saw with fuel is the ignition system not working properly.

 

[poppiecarver15]

thanks i did not have any trouble with wet exhaust or flooding before rebuild so i think you are correct in it being the check valve before it just did not run good at WOT sometimes.thanks again hope this is the last thing to fix haha the fun of working on old things,but the saw is in such good shape and i like running it.

 

[Maintenance supervisor]

thanks i did not have any trouble with wet exhaust or flooding before rebuild so i think you are correct in it being the check valve before it just did not run good at WOT sometimes.thanks again hope this is the last thing to fix haha the fun of working on old things,but the saw is in such good shape and i like running it.

Well if it gives you any more trouble after the check valve, I'll mail you a known good carb I've got.
Its good to have a spare or 6 ,haha.

 

[heimannm]

 

[poppiecarver15]

thanks for the offer i will post back when my check valve comes and i get it replaced and i will let you know the results.thanks again

 

[poppiecarver15]

another question the idle screw is on the side looking from the handle and is on the left, any idea where is a good starting point for it with the high and low at 1 1/2 turns .thanks Jim

 

[Maintenance supervisor]

H andL 1 turn out from lightly seated. Idle screw usually 3.

 

[poppiecarver15]

ok thanks for that info.will reset them after i get the new check valve in. thanks Jim

 

[poppiecarver15]

hi ,i did not forget about this threat ,i am still waiting on my check valve kit it was back ordered and should be ship on Jan, 2nd or 3rd i hope. then will get it installed and let you know how it works,hoping that is what it is replaced everything else i think.thanks Jim

 

[poppiecarver15]

well i was just informed my part is still back ordered ,not to happly but will let you know how it works out when i get it,soon i hope Jim