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Caterpillar (Craftsman GT18) runs.... kinda...


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#1 wvbuzzmaster OFFLINE  

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Posted December 11, 2011 - 04:19 PM

Here is an update for all those wondering, and for those that wish to help. Yesterday the Gt18 with its opposed briggs twin 18 hp started and ran 3 seconds before dying, never to start again. Now today.. I got it to start and run the first time for about 15-20 minutes, even drove it around with the gumout in it, and was fine until I messed with the throttle too much, resulting in it dying, never to restart again... So I drug it back to the shop and pulled the plugs, so tomorrow I will just get it a pair of plugs. They are Champion RJ12C, is that the correct plug for an 18 HP Briggs opposed twin??

One of the plugs did appear fouled so we will see if new plugs fixes it not wanting to start now. Stupid brand new magneto...

#2 JDBrian OFFLINE  

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Posted December 11, 2011 - 04:26 PM

I'd check the spark and see if you are getting a nice hot spark on both cylinders. Maybe that 1 side with the fouled plug has poor spark!

#3 johnboggs21 OFFLINE  

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Posted December 11, 2011 - 05:05 PM

make sure ya got the plugs gapped right too, it makes more of a difference than you would think

#4 AcreFarm OFFLINE  

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Posted December 11, 2011 - 05:16 PM

It should have J19LM or equivalent plugs, gapped to .030
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#5 wvbuzzmaster OFFLINE  

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Posted December 11, 2011 - 05:30 PM

It should have J19LM or equivalent plugs, gapped to .030

So I should have hotter plugs? My engine is 422437-1209-01

#6 AcreFarm OFFLINE  

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Posted December 11, 2011 - 05:39 PM

The RJ19LM/J19LM is hotter than the RJ12C which could be part of your problem.
Here is ASECC's chart for Briggs plugs
Opposed Twin Cylinder "L" Head - Briggs & Stratton Spark Plug Conversion Chart
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#7 wvbuzzmaster OFFLINE  

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Posted December 11, 2011 - 05:45 PM

AcreFarm,
Thanks for that information because the old spark plugs (which never gave me any problem before the new magneto) could be a large part of my current problems. I just need to get it running long enough with the Gumout in it to clean the carb, but the starting/restarting is my biggest issue at the moment. Thanks a bunch.

#8 AcreFarm OFFLINE  

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Posted December 11, 2011 - 05:54 PM

No trouble at all Casey. Hopefully that gets you up and running :thumbs:

#9 wvbuzzmaster OFFLINE  

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Posted December 11, 2011 - 06:03 PM

I hope so, I haven't had the thing together and running since I fried the magneto this past spring!! So it is frustrating to be so close yet feel so far from victory..

#10 Gibby OFFLINE  

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Posted December 11, 2011 - 09:20 PM

Perhaps the gumout knocked stuff loose and plugged the carb? I know it's an issue with fuel injection.

#11 wvbuzzmaster OFFLINE  

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Posted December 11, 2011 - 09:50 PM

Carburetor, no fuel injection. I been running gumout in it for couple years no issue. Makes the tractors run much smoother.

#12 MH81 ONLINE  

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Posted December 11, 2011 - 10:57 PM

As I have voiced to Casey, I have an aversion to Champion plugs in anything other than a Continental engine. Found Continental F-x series run better with Champions & this is an irritant to me, because I have had more intermittently bad plugs with "Champion" on them. I do run them in the old Massey's, but have nearly thrown my shoulder out several times "disposing" of spark plugs over the hill.

If it were me, I would find any other brand's xref to put in there.... but that's just me :D

The other thing is to give it a new fuel filter. You may be struggling to get enough fuel thru it, especially if it's never been changed before.

Edited by MH81, December 12, 2011 - 08:36 AM.

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#13 HALFSCALE OFFLINE  

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Posted December 12, 2011 - 01:48 AM

Does this engine have the fuel pump built into the carb ?, I 've had issues with the new gas and that style fuel pump, been replacing them with the kohler vacum pump.

#14 Trav1s ONLINE  

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Posted December 12, 2011 - 08:17 AM

I would go for Seafoam in the gas. Plug temp is definitely a potential issue.

#15 johnboggs21 OFFLINE  

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Posted December 12, 2011 - 09:48 AM

Does this engine have the fuel pump built into the carb ?, I 've had issues with the new gas and that style fuel pump, been replacing them with the kohler vacum pump.



in that case, id just find something to use as a temporary tank and prop it up somewhere high to take the fuel pump out of the equation




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