carb adjustment problems

[JaysNJcub127]

hello, I put a #26 carb on my 127. It was previously rebuilt. The motor runs real smooth and has power, but it is smelling rich and now puffs smoke a it and smells like gas......It also has a new headgasket and nice flat head with plenty of compression. I did notice something today as i tried to start it. It has been in my shed for 1 week untouched and was very cold, so i pulled the choke out and nothing.......pushed it in and it fired. As soon as i put the choke slightly on, it died........I am thinking maybe the float is ff or something and its flooding? What are your thoughts? This motor NEVER puffed any smoke before when i had the walbro carb on it. I actually just rebuilt my walbro and put it on my 105 project and it works good.

[Matt G.]

It's too rich. Remove the air filter and see if there is gas sitting in the throat of the carb. If the area in there by the atmospheric vent is wet with gas, the float might be a touch too high. If not, I'd lean the main jet a bit.

[JaysNJcub127]

Originally Posted by Matt G.

It's too rich. Remove the air filter and see if there is gas sitting in the throat of the carb. If the area in there by the atmospheric vent is wet with gas, the float might be a touch too high. If not, I'd lean the main jet a bit.

Thanks Matt, I did try and lean it, when I lean it a bit, it runs rough and surges. I am definatly thinking the float is out of adjustment or there is something blocking the needle or something. Can't hurt to check it out. Thanks bud !!!

[JaysNJcub127]

Still hard to fire with choke on. it kicked over and had to turn the choke off right away. I did adjust the float according to the service manual. I put the carb on initial setting and warmed it up. I got the low idle perfect !!! Seems like I got the high idle pretty good, but the setting on carb would lead me to believe its lean. To be honest, the carb was well used on the inside, but the throttle shaft was tight and stiff, so looks to be ok. I am getting alot less fumes now, but still a little puff which i guess is no big deal. I am gonna let it cool and try and fire it again later. Any suggestions why it wont fire with choke on?

[JaysNJcub127]

Well tried again and no luck, would not fire with the choke and was hard to start. No matter what i did could not get it right. After an hour of frurstruation I took it off and put the rebuilt Walbro on, and its running MUCH better.

Can a carb just be shot at some point and not rebuildable? I mean it all looks good and is clean..... Just will not setup right.

[Matt G.]

'Looks clean' and 'clean' are two different things. Has the carb been soaked in a bucket of carb cleaner? There are lots of passages that need to be clear and they are not visible. The main jet needle is hollow and has 2 sets of holes in it. You should be able to put your mouth over the pointy end and lower set of holes and blow through it and out the upper set of holes by the threads. If not, something is clogged up.

Carbs don't 'wear out' other than where the throttle shaft goes, and that is easily repaired and isn't the problem here anyway.

[JaysNJcub127]

Originally Posted by Matt G.

'Looks clean' and 'clean' are two different things. Has the carb been soaked in a bucket of carb cleaner? There are lots of passages that need to be clear and they are not visible. The main jet needle is hollow and has 2 sets of holes in it. You should be able to put your mouth over the pointy end and lower set of holes and blow through it and out the upper set of holes by the threads. If not, something is clogged up.

Carbs don't 'wear out' other than where the throttle shaft goes, and that is easily repaired and isn't the problem here anyway.

yes its clean. It was rebuilt by someone who knows what they are doing and was soaked etc. then I took it apart and soaked it again and blew it all out with a compressor. The float is is good, no leaks, and I set it to the correct specs. The needles are clean and free. I am confused

[Rhoderman]

Hi Jason,
My 122 won't start unless I close the choke. But, once it fires, I'd better be opening the choke or it will flood. It will start reliably if I follow this procedure: Open throttle enough to see the throttle move just a little, choke it, roll the starter, and when it pops, release the choke. I may have to run on partial choke for a bit, but once she's warmed up there are no issues.
For yours, I'd start to wondering how good the coil/points/condenser are, and how nice the plug is. A new plug wire might also be helpful. I had a bad coil on my 122 when I first got it. The PO had installed a non-cub (not rated for 12V constant) coil. It would get hot and run like heck.
Is it possible someone "fixed up" your #26 carb? I've seen people do some real harm with a drill bit when they thought they were improving it.
Good Luck!
Jim

[JaysNJcub127]

Originally Posted by Rhoderman

Hi Jason,
My 122 won't start unless I close the choke. But, once it fires, I'd better be opening the choke or it will flood. It will start reliably if I follow this procedure: Open throttle enough to see the throttle move just a little, choke it, roll the starter, and when it pops, release the choke. I may have to run on partial choke for a bit, but once she's warmed up there are no issues.
For yours, I'd start to wondering how good the coil/points/condenser are, and how nice the plug is. A new plug wire might also be helpful. I had a bad coil on my 122 when I first got it. The PO had installed a non-cub (not rated for 12V constant) coil. It would get hot and run like heck.
Is it possible someone "fixed up" your #26 carb? I've seen people do some real harm with a drill bit when they thought they were improving it.
Good Luck!
Jim

brand new kohler coil, new condeser, new points, new head gasket, new plug, clean fuel system. No the carb is unmodified, got it from a reliable source. Runs great with the walbro i just redid.