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Hi,
I have a T B Sickle Mower that surges all the time, and now wont increase its Rev's, model is the 34337, 4hp, cleaned the carb twice, still not right, probably need a new carb.
E/Bay research suggests that the carb that will do the job is 6150 650 series, the question is will it fit and do the job.
regards to all. Mike

We could assist better if we had the engine model number information. The engine is considered a separate item from the mower as far as parts.

Sound like a linkage problem now, as well as a little bit of gunk yet in the carb. Put up some pics of the engine carb, etc. as well as the engine's model numbers.

Fish said:

Sound like a linkage problem now, as well as a little bit of gunk yet in the carb. Put up some pics of the engine carb, etc. as well as the engine's model numbers.

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Hi,
Sorry I should have known better than to give the Model only.
This is what is on the plate on the front of the Engine.
Model---12G782
Type-----1729
Code----0002059
4hp
Here is a little history about this mower. Purchased used last year, did not run very well, may have been messed with before, what I have done this week to try and correct the problem.
1/ Cleaned carb (twice) using a thin strand of wire from a wire brush, blow out carb with comp air, checked float for leakage, fit new O ring (carb to manifold).
2/ Flushed Tank and replaced the Fuel.
3/ Replaced the Air Filter.
Just a note, not happy with the spring tension just seems to slack, if I override the Governor by holding the butterfly open/closed the engine will give its all, BUT in the back ground it still wants to surge, sorry cant seem to upload Pic's its says file to large server cant handle it. Regards Mike.

ILENGINE said:

We could assist better if we had the engine model number information. The engine is considered a separate item from the mower as far as parts.

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Hi,
Information on the Engine plate.
Model---12G782
Type-----1729
Code-----0002059
I have replied to Fish just above/below, with lots of information that should have been sent to you, however all help is appreciated, please read, as it may help with a solution.
Regards Mike.

The carb may need to be removed and completely disassembled and soaked in carb cleaner and a complete carb repair kit installed. Because for proper cleaning you will need to remove the welch plug on the side of the carb to get to the idle passages. But with that application I wouldn't overlook the possibility of a cracked plastic intake manifold. So may need to remove the blower housing to inspect that.

And those engines use a low tension governor spring so slack is kind of a relative term.

Many times the jet/bowl nut is partially clogged, causing it to run a little lean. Look closely and find all of the tiny holes and make sure that they are clear.

LADY>TIGGER said:

E/Bay research suggests that the carb that will do the job is 6150 650 series

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Ebay carb alert.

Clean/repair the OEM carb and install. Clean the entire fuel system while you are at it.

Fish said:

Many times the jet/bowl nut is partially clogged, causing it to run a little lean. Look closely and find all of the tiny holes and make sure that they are clear.View attachment 62994

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Hi, Thank you for your advises, done that three times, and again today, I was thinking some where along the lines of an air leak on the manifold so sprayed wd40 all over every joint and all along the entry point to the engine no rise or fall in rev's so cant really be an air leak, I have worked on motor vehicles (mechanic) these last 60 years, 79 now and this is baffling me, but I must admit this is kind of a new type of carb and governor system I am not clued up on.
I am going to give it one more go tomorrow then I think it will be a new Carb. Regards Mike. from France.

slomo said:

Ebay carb alert.

Clean/repair the OEM carb and install. Clean the entire fuel system while you are at it.

Click to expand...

Hi,
Yes I have done that, flushed the system completely, fresh fuel checked for air leaks spraying WD40 on all possible places that air may get drawn in, doing that eliminates air ingress, removed and cleaned, not just looked at carb 4 times now. Thank for your reply. Regards Mike.

LADY>TIGGER said:

Hi, Thank you for your advises, done that three times, and again today, I was thinking some where along the lines of an air leak on the manifold so sprayed wd40 all over every joint and all along the entry point to the engine no rise or fall in rev's so cant really be an air leak, I have worked on motor vehicles (mechanic) these last 60 years, 79 now and this is baffling me, but I must admit this is kind of a new type of carb and governor system I am not clued up on.
I am going to give it one more go tomorrow then I think it will be a new Carb. Regards Mike. from France.

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I have a handy set of torch tip cleaners, and have a few times opened up passages a little extra in the past.

LADY>TIGGER said:

Mower that surges all the time, and now wont increase its Rev's

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Dirty carb and or fuel system. Old fuel, water in fuel or weak spark.

The problem is not with the carb. Your intake valve is not closing properly and this is causing the surge. Email me at dvata at yahoo dot com and I’ll describe what you need to do.

Just get a new, cheap carb from ebay. I was removing and cleaning my John Deere lawn tractor carb many times and it still wouldn't run right. I bought a carb on ebay and FIXED. It's been running great for three years now.

When cleaning the carb, did you remove and clean the emulsion tube? Wondering if you need to go through the govenor setup to get the linkage correct?

If you close the choke slightly and it runs better, then it's starving for fuel. Usually still dirt in the idle circuit of the carb. Cheap replacement carbs are 50\50%. Some work great and others will either leak or surge. I have found to cure the surging, increasing the size of the idle jet with a small drill bit. Do in increments. Leaking is another issue, just return it. If you get a bad one and ask for a refund, I have never had to return one. Gas stinks in the shipping box. Get ur refund and try and fix the bad one or just try another.

Check for "slop" in the linkage to the carburetor, throttle cable, links to governor. There should also be a spring on the governor link(s) that pull the connected parts together to keep the "slop" from affecting performance.

By slop, I mean where the cable ends or link ends connect to the various levers. If there is a lot of play in these joints, it can also add to instability.
Good Luck.

LADY>TIGGER said:

Hi,
I have a T B Sickle Mower that surges all the time, and now wont increase its Rev's, model is the 34337, 4hp, cleaned the carb twice, still not right, probably need a new carb.
E/Bay research suggests that the carb that will do the job is 6150 650 series, the question is will it fit and do the job.
regards to all. Mike

Click to expand...

Set the govener rod on it

If you are considering a new carb then you could try giving just a bit more fuel through the main jet. Micro drills would let you "open up" the main a bit more to see if that helps. Not much, very little or your orig carb will be toast.

LADY>TIGGER said:

Hi,
I have a T B Sickle Mower that surges all the time, and now wont increase its Rev's, model is the 34337, 4hp, cleaned the carb twice, still not right, probably need a new carb.
E/Bay research suggests that the carb that will do the job is 6150 650 series, the question is will it fit and do the job.
regards to all. Mike

Click to expand...

LADY>TIGGER said:

Hi, Thank you for your advises, done that three times, and again today, I was thinking some where along the lines of an air leak on the manifold so sprayed wd40 all over every joint and all along the entry point to the engine no rise or fall in rev's so cant really be an air leak, I have worked on motor vehicles (mechanic) these last 60 years, 79 now and this is baffling me, but I must admit this is kind of a new type of carb and governor system I am not clued up on.
I am going to give it one more go tomorrow then I think it will be a new Carb. Regards Mike. from France.

Click to expand...

I'd suggest first a new fuel filter. I've solved many problems like yours with that. Since it runs fine for 5 minutes, the carb must be good? Or the gas cap on the fuel tank may need it's vent cleared?

LADY>TIGGER said:

Hi,
I have a T B Sickle Mower that surges all the time, and now wont increase its Rev's, model is the 34337, 4hp, cleaned the carb twice, still not right, probably need a new carb.
E/Bay research suggests that the carb that will do the job is 6150 650 series, the question is will it fit and do the job.
regards to all. Mike

Click to expand...

Surging is almost ALWAYS related to the Governor. Springs are very temperamental. There’s a reason there are so many different holes in the Governor arm to hook the spring to. I move the spring, one hole at a time and run it until the surging stops. Some motors have a “bendable” arm that you can tweak a little with a needle nose. Hope it helps.

laurin800 said:

Surging is almost ALWAYS related to the Governor. Springs are very temperamental. There’s a reason there are so many different holes in the Governor arm to hook the spring to. I move the spring, one hole at a time and run it until the surging stops. Some motors have a “bendable” arm that you can tweak a little with a needle nose. Hope it helps.

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Many of us mechanics will probably disagree. I personally know there is several things beside the springs that can cause surging. For me it is a lot of the time a fuel mixture problem or linkage wear.

One more thought. I have heard that "some" carb manufacturers place a "filter" or screen inside the fuel inlet. Therer could be a hidden obstruction inside the inlet for fuel. Just reverse air pressure or carb clean to clean..

Fuel tank is not venting. The 5 minute run is about what a full float bowl would give. I think the carb is ok and you have an obstruction in the fuel tank to carb. be sure to check the fuel tank for a filter as well. try running with an alternate fuel source.

Surging on a governed engine is because there is insufficient fuel to maintain a constant speed .
IT is not CAUSED by the governor
It PROVES that the governor is working as it should
A wrong governor spring or spring in the wrong hole does nothing more than change the engine speed

Have your carb cleaned by ultrasonic, “swishing, blowing, using a wire” does nothing with today’s crap fuel!