Newbie with Craftsman B&S 5HP tiller reving way too much after carb rebuild

[txpinecone]

Hello all,
I just cleaned and replaced a few parts in the carburetor of my 5HP B&S Craftsman tiller. It starts with one pull now rather than endless pulls with no starts. However the linkage is going crazy reving back and forth. I read somewhere that it is a sign it is gasping for fuel but the carb (696981) has only one adjustment screw and I can't get any progress with it - or don't know how to.
The model is 126402 0206-e1. Any advise appreciated.

txpinecone

 

[jc56]

Hummmmm.....do you think that you have the governor spring back in the right spot????You say adjusting the carb doesn't effect it any??Just some ideas.jc

 

[ILENGINE]

That style of carb on the briggs is really bad to get either corrosion or debris in the idle circuit of the carb which is the cause for surging. The down side of that carb is because of the hidden passages, no amount of cleaning will get it to run correctly in some cases and your only option is to replace the carb.

At last track the carb did cost much more than installing the repair kit plus your time.

That is the reason that a lot of repair shops have gone to just replacing the carbs on equipment, instead of cleaning and installing kits, because with a lot of the new carbs you have a 50/50 chance of getting is to work properly after carb repair. If it doesn't run correctly the shop has wasted the repair kit, the technicians time, and shop money.

 

[reynoldston]

That style of carb on the briggs is really bad to get either corrosion or debris in the idle circuit of the carb which is the cause for surging. The down side of that carb is because of the hidden passages, no amount of cleaning will get it to run correctly in some cases and your only option is to replace the carb.

At last track the carb did cost much more than installing the repair kit plus your time.

That is the reason that a lot of repair shops have gone to just replacing the carbs on equipment, instead of cleaning and installing kits, because with a lot of the new carbs you have a 50/50 chance of getting is to work properly after carb repair. If it doesn't run correctly the shop has wasted the repair kit, the technicians time, and shop money.

Ilengine beat me to the draw and he is right on the idle circuit causing a surge.

 

[txpinecone]

Ilengine, thanks for the advice. I may do just that. I'll try to adjust it some more this weekend. But I'm concerned about it blowing the top the way it surges. And the linkagge being under the gas tank certainly does not help matters. Buy a new carb would be a sensible bet versus taking it to the shop.

 

[txpinecone]

One more question in regards to this post. In order for the engine to run I have to have the choke half open. Is this a bad thing or damaging to the engine? If not I'd rather not spend the $$$ for a new carb just for a few hours of tilling up the garden soil. Please advise. :confused2:

 

[ILENGINE]

In the short term probably not. In the long term could cause spark plug fouling, and cylinder scoring from washing the cylinder walls down with extra gas.

 

[txpinecone]

Thank you ILENGINE. Being it's tilling I hope it's as short-term as possible.

txpinecone

 

[kayro]

hey guys i got the same problem as newbe except i replaced the carb and it still surges. think i got a bad carb? its a straight forward carb no adjustments. $47.00

thanks
kayro

 

[ILENGINE]

Could be one of the rare cases caused by a governor issue, but most likely carb related. To isolate the problem, while it is running hold the governor steady at idle and see if tries to die, if not then it is governor related. Some of the engines have two governor springs and if not syncronized correctly will cause a surge.