Idle too high...can't adjust carb>
- Thread starter skizman
- Start date
- Status
OzFab
Well-known member
It's there somewhere, there's an idle adjustment on pretty much every carb ever built; post some pics of your carb so we can see exactly which one you have...
danssoslow
Member
From reading about the clones purchased in California. If you have bought yours in Cali, or online and was identified as being CARB compliant, chances are this is why your carb is non adjustable.
But as Fabroman pointed out, the adjustment is more than likely still there. On the CARB approved clone engines, the adjustment screw was epoxied over. Reports from those that have them say it is possible to uncover.
Poboy kartman
Senior Moments Member
If it's the carb I'm thinking of- there should be a screw on top that controls the butterfly. That is probably the only adjustment there is. An idle needle and seat wouldn't control speed anyway to any degree-it controls air/fuel mixture and either that's right or it's wrong.
So unless it is idling poorly, those epoxied screws don't need to be messed with.
It's also possible that it has nothing to do with the carb. The idle screw could be retracted far enough to idle correctly but the throttle cable adjustment off or something in this governor linkage binding.
Anyway- look there. The plate on top should hit the screw.If it does-then back it off.If not you have one of the other problems.
So unless it is idling poorly, those epoxied screws don't need to be messed with.
It's also possible that it has nothing to do with the carb. The idle screw could be retracted far enough to idle correctly but the throttle cable adjustment off or something in this governor linkage binding.
Anyway- look there. The plate on top should hit the screw.If it does-then back it off.If not you have one of the other problems.
OzFab
Well-known member
That explains a lot. Based on the Tec carbs I've seen, that one's incomplete, there should be another linkage that controls the main butterfly linkage, that's where the idle screw is...
Poboy kartman
Senior Moments Member
That's a little weird to me. I think I see the governor linkage in the back. At any rate- the throttle cable should hook up to a throttle plate which hooks up to the governor arm at the bottom with a spring and a link. This is on the other side of the motor from where the throttle cable is now. Someone's bypassed the governor but did a hack job of it.I'll see if I can post some pics after the Cowboys game.
Poboy kartman
Senior Moments Member
Oh well- it's just the Iggles, so I can post between plays.
The first pic shows the governor arm and carb link and the spring on the bottom. The second one shows the spring and link and part of the throttle plate. Your engine may be different but this is pretty standard.
The first pic shows the governor arm and carb link and the spring on the bottom. The second one shows the spring and link and part of the throttle plate. Your engine may be different but this is pretty standard.
Attachments
-
20131001_190554.jpg -
20131001_190500.jpg
Poboy kartman
Senior Moments Member
Can you post the model #? I could tell a lot more from that and give you a pretty definitive answer as to what your linkage should look like.
Model# is OHH60 71131D. As seen in my pic...I added a spring on the left...to just make sure the butterfly always closes. There isn't any sign of where an idle screw would be. The governor works fine.
What is happening is when the engine is at idle(a little too high)...the clutch expands a little and the rear wheels start turning. The clutch is nice and clean inside and I lubed it with graphite powder. If I can't bring the idle down, then there must be something I can do to the clutch to stop it from expanding so much at idle.
Otherwise....the kart runs great.
I appreciate your time and info!
What is happening is when the engine is at idle(a little too high)...the clutch expands a little and the rear wheels start turning. The clutch is nice and clean inside and I lubed it with graphite powder. If I can't bring the idle down, then there must be something I can do to the clutch to stop it from expanding so much at idle.
Otherwise....the kart runs great.
I appreciate your time and info!
Poboy kartman
Senior Moments Member
Oh- that's what I was seeing in the picture. I can't see everything sometimes with my phone.
rocketkart
Active member
i cant see in your pic but see if there a idle screw in the top of the butterfly on in the back. thay make them like this on some of the Tecumseh engines.http://www.diygokarts.com/vb/picture.php?albumid=596&pictureid=3395 i don't think that your carb is the original.
fowler
New member
whats setting the idle at the moment
something is obviously stopping it from dying
i assume its that little tab that the idle screw should be acting on
what is your throttle connection like
one would think the easiest method would be to install a thicker cable then do away with any settings on the carb
as in run a big cable and a small backup return spring
then the idle is set at the pedal
the cable both pulls on the throttle and pushes it to close it
then u must have a small spring so in the event u have a connection failure the throttle will default to closed butterfly
the spring will also keep a little tension on the cable
something is obviously stopping it from dying
i assume its that little tab that the idle screw should be acting on
what is your throttle connection like
one would think the easiest method would be to install a thicker cable then do away with any settings on the carb
as in run a big cable and a small backup return spring
then the idle is set at the pedal
the cable both pulls on the throttle and pushes it to close it
then u must have a small spring so in the event u have a connection failure the throttle will default to closed butterfly
the spring will also keep a little tension on the cable
Have you looked at all these links
Tecumseh carb cleanup, servicing and troubleshooting
http://www.kichline.com/chuck/fixit/mowers/tcarb/tcarb.html
http://www.smallenginesuppliers.com...cumseh_L-Head_Engines_Service_Information.pdf
http://www.smallenginesuppliers.com...cumseh/Tecumseh-basic-service-information.pdf
Tecumseh carb cleanup, servicing and troubleshooting
http://www.kichline.com/chuck/fixit/mowers/tcarb/tcarb.html
http://www.smallenginesuppliers.com...cumseh_L-Head_Engines_Service_Information.pdf
http://www.smallenginesuppliers.com...cumseh/Tecumseh-basic-service-information.pdf
Poboy kartman
Senior Moments Member
I believe him that there is no idle screw on the carb. I just haven't gotten around to researching where it is. Fabroman is correct in that it is not on the carb. Some Tecumsehs adjust by linkage to the throttle plate.
The 0HH50s adjust at the carb in the older models and in the linkage with the newer models. Given that this is an OHH60- it should be very similar only 1hp more.
I haven't gotten on this too quickly because the OP says the butterfly plate tab is hitting the carb body and if so I don't see how a linkage adjustment is going to fix that. He has even added a spring to make sure it returns all the way. I think we're at the point where bending the tab is probably the solution.
Unfortunately- the only picture of the situation showes a real nice shot of the primer bulb and not much else.
To the OP: Take off the air filter and look at the throttle butterfly. Bend the tab so that it is barely open. That has to work I would think. Anyway, there isn't much point in looking anywhere else if that tab is hitting the carb body.
Try that and if the tab doesn't hit the carb after bending or you have any other problems- let us know. And let us know if you get it fixed.
The 0HH50s adjust at the carb in the older models and in the linkage with the newer models. Given that this is an OHH60- it should be very similar only 1hp more.
I haven't gotten on this too quickly because the OP says the butterfly plate tab is hitting the carb body and if so I don't see how a linkage adjustment is going to fix that. He has even added a spring to make sure it returns all the way. I think we're at the point where bending the tab is probably the solution.
Unfortunately- the only picture of the situation showes a real nice shot of the primer bulb and not much else.
To the OP: Take off the air filter and look at the throttle butterfly. Bend the tab so that it is barely open. That has to work I would think. Anyway, there isn't much point in looking anywhere else if that tab is hitting the carb body.
Try that and if the tab doesn't hit the carb after bending or you have any other problems- let us know. And let us know if you get it fixed.
danssoslow
Member
That tab is resting against that spring bound screw in the pic, is it not? Would it not stand to reason that that screw is the idle adjustment?
The guy I ride around with sports one of these engines. I'll try to get ahold of him soon to do some investigating.
The guy I ride around with sports one of these engines. I'll try to get ahold of him soon to do some investigating.
I appreciate the info from you guys but you are going overboard with this....trying to tell me that there is a "idle adjustment screw." The tab is resting on the body of the carb....that's what stops it. THERE IS NOT A IDLE ADJUSTMENT SCREW ON THIS CARB!!!!!! I bent the tab a little but it didn't lower the idle because the butterfly plate can't close anymore than it is.
I saw another 6hp Tecumseh today at a lawn mower junk yard and the carb was completely different than mine....so yes.....my carb is not original equipment.
I saw another 6hp Tecumseh today at a lawn mower junk yard and the carb was completely different than mine....so yes.....my carb is not original equipment.
rocketkart
Active member
get the carb that you seen at the lawn mower junk yard.
- Status