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Choke And Throttle Problem


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#1 trackcar OFFLINE  

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Posted July 15, 2013 - 09:11 PM

I have a GT twin 18 h.p. that I can start with the choke allright, but if I add throttle and choke down the engine cuts off. The engine runs at 1/2 choke and 1/2 throttle, but not very well. It has been a few years since it ran respectably. The throttle cable is a little iffy behind the dash (coil wrap stretches a little), but still seems to function okay. The only gasket I have uncovered so far is the one between the air cleaner and the top of the carb and it is not in good shape. I will give an update tomorrow on other obsevations.


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#2 MH81 ONLINE  

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Posted July 15, 2013 - 09:14 PM

Which engine is in it? Also, can u see the choke plate operate correctly or is it only partly opening?
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#3 HDWildBill OFFLINE  

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Posted July 15, 2013 - 09:31 PM

If the choke is functioning correctly then sounds like the Carburetor may be stopped up. 


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#4 JDBrian OFFLINE  

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Posted July 16, 2013 - 04:13 AM

Give the engine a good once over/tune up and you'll probably find the problem. Sometimes a poor spark or no spark on 1 cylinder will cause problems like you are having.


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#5 larryd OFFLINE  

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Posted July 16, 2013 - 11:34 AM

Sounds like the carb could a good cleaning and check fuel filter and lines also

larryd
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#6 olcowhand ONLINE  

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Posted July 16, 2013 - 11:39 AM

Likely has the Marvel Schreiber "DD" carb with built on fuel pump.  Likely needs a complete rebuild for entire carb plus the pump.  Doesn't take much crud to foul these carbs, and I'd bet you'll find all kinds of crud inside, especially inside the fuel pump..  If it has the composite float, best to get an all metal float too.   Myself, I'd go with a low pressure electric fuel pump, as these vacuum type can be a pain.  


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#7 trackcar OFFLINE  

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Posted July 16, 2013 - 08:22 PM

Which engine is in it? Also, can u see the choke plate operate correctly or is it only partly opening?

I can see the choke plate and it seems to be operating correctly.

 

Here is the engine info:

 

Craftsman 18HP

4 cycle   Electronic Ignition

Twin Cylinder  Cast-Iron Bores

 

On the top shield

 

Briggs & Stratton Co.

 

Model         Type          Code

422437    1209 01     88030112

 

It has a "pulse-type" fuel pump.

 

Trying to start it today after recharging the battery (I think I recharged it way too much lately), it wouldn't even turn over, not even when trying to jump it off my truck!  Just a high-pitched squealing sound. I was attempting to check spark plug "spark".


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#8 MH81 ONLINE  

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Posted July 16, 2013 - 08:26 PM

Twin Briggs huh? When you get it rolling over, do a compression test.   


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#9 olcowhand ONLINE  

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Posted July 16, 2013 - 08:32 PM

Never seen a GT with a Briggs!  Always been Onan.  Your carb isn't as finicky as the DD carbs.


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#10 trackcar OFFLINE  

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Posted July 17, 2013 - 11:31 AM

Twin Briggs huh? When you get it rolling over, do a compression test.   

Whoa!  I'd have to take it to the shop for that one.



#11 WNYTractorTinkerer OFFLINE  

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Posted July 17, 2013 - 12:11 PM

Whoa!  I'd have to take it to the shop for that one.

Sounds like you need a trip to Sears or Harbor Freight to get a new toy (aka- compression tester!) :rocker2:


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#12 trackcar OFFLINE  

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Posted July 17, 2013 - 02:42 PM

I do have good spark on both cylinders. (Borrowed Deka from CC)



#13 MH81 ONLINE  

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Posted July 17, 2013 - 03:49 PM

Whoa!  I'd have to take it to the shop for that one.

Might be time for a tool

 http://www.harborfre...ster-95187.html



#14 EricFromPa ONLINE  

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Posted July 17, 2013 - 04:17 PM

Sounds like your main jet is partly plugged up and the fuel pump is weak.

 

I just put a carb and fuel pump kit in my Craftsman II GT18 and a new starter gear on the starter.Sounds like your having the exact same problem that I was having.

 

The squealing sound is the starter trying to burn it's self up.Most likely your starter gear is partly stripped and jammed up on a gear.The pain in the butt thing is that it's darn near impossible to get the starter out without taking the engine out.

 

Mine did the exact same thing. I had to pull the engine to get the starter out.

 

I was cranking it pretty good trying to figure out why it wasn't starting.Started and ran awesome after rebuilding the carb and fuel pump.Then I was using it to haul my little wagon the other week and shut it off to load it up again left it sit for a couple hours and then I lost spark.So mine needs another coil to.

 

I haven't got to changing the coil yet or to put my starter back in but I got the starter back together with a new gear on it.I took the starter apart and cleaned it up and greased the bushings before I put the new gear on.

 

 

This is the Kit that I got.Complete with Fuel pump rebuild kit.

http://www.ebay.com/...76e7f40&vxp=mtr

 

 

Your starter gear should be a standard 16 tooth briggs starter gear.


Edited by EricFromPa, July 17, 2013 - 04:20 PM.

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#15 TAHOE OFFLINE  

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Posted July 18, 2013 - 08:11 AM

I have a '88 or '89 Sears with Twin Briggs, did the same thing. It got to the point carb was so clogged wouldn't even hardly run with choke on. I bought rebuild kit for like $20-25 and she runs pretty well now.


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