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#1
10-27-2012, 01:58 PM
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M 18 vibration
I picked a 782 with a M18 in it yesterday. PO said the carb needed attention so I took it off and give it a good cleaning and put it back on. Got the tractor started and it vibrates and shakes pretty bad at idle or full throttle. I was thinking maybe it was missing out on one of the cylinders so I pulled one spark plug wire off and it died ,I pulled the other spark plug wire off and it dies. I'm talking about dies not just missing out. What to heck is going on . This is my first experience with a m 18 ,so this is new ground for me. Can you guys tell me what is going on?
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1973 149 with 44" Deck, 782 with Simms cab, 1966 102 with 38" deck, 50" deck, 5 42" Blade, Brinly 8" 3- point Plow, Brinly 10' Sleeve hitch Plow, Brinly 12' 3-point Plow, 782 Pile, 2-38' Decks, QA-42A,1650 Roller, QA42 Thrower, Kubota BX 2360, 1970 IH one ton 4x4, one 1959 farmall cub restored, two 1949 farmall cub projects, cub grader blade, 5 sickle bar mowers , 1 set cutivators , 1 fast hitch plow, 1. 1950s IH hay rake 
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#2
10-27-2012, 02:04 PM
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I would bet the carb is junk. You might try to rebuild it but if it has the Walbro, it probably won't work. I say it's the carb because my 582 with a M18 was running terrible until I richened up the fuel mixture and it cleared it up immediately. Problem with the Walbro carb is that it's not adjustable. Best solution would be to find a Kohler adjustable carb from a KT17 and replace the one you have.
AJ
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1980 [COLOR="Red"][/COLOR]482- Stock 1981 [COLOR="Red"][/COLOR]582- Mag18, Sleeve Hitch, Spring assist 1979 [COLOR="Red"][/COLOR]682- Mag18, Sleeve Hitch, Spring Assist, #1 Tiller 1980 [COLOR="Red"][/COLOR]782- Mag18, Sleeve Hitch 1983 [COLOR="Red"][/COLOR]982- Stock, Fully Optioned
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#3
10-27-2012, 02:31 PM
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I have been trouble shooting two mag 18's.
The first one ran rough and would smooth out with a lot of choke. I cleaned the carb twice - no go, put in a carter with adjustable load needle and it runs nice and smooth. The second Mag ran the same at first. I cleaned out the carb bowl (full of snot) now runs good. Hopefully all yours may need is a cleaning. Dan
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#4
10-27-2012, 04:02 PM
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I agree. Those Walbro's are hit or miss. Sometimes a cleaning can get them to work, other times you have to eat the bullet and throw them in the garbage.
For the OP's info, the Carter carb that badboy mentioned is also known as the Kohler carb or at least they are the same carb. I want to say that Carter started making them for Kohler and then Kohler starter building the identical carb them themselves. The rebuild kits for the Carter/kohler carbs are the same. The Walbro rebuild kit is different. AJ
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1980 [COLOR="Red"][/COLOR]482- Stock 1981 [COLOR="Red"][/COLOR]582- Mag18, Sleeve Hitch, Spring assist 1979 [COLOR="Red"][/COLOR]682- Mag18, Sleeve Hitch, Spring Assist, #1 Tiller 1980 [COLOR="Red"][/COLOR]782- Mag18, Sleeve Hitch 1983 [COLOR="Red"][/COLOR]982- Stock, Fully Optioned
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#5
10-28-2012, 08:01 AM
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Maybe I shouldn't have used the word vibrate , I should have just said SHAKE. This thing shakes so bad the seat jumps up and down, you think it's going to shake the open hood off and it looks like it might shake the muffler shroud loose. It's almost like part of the flywheel is missing. And the other thing I don't understand why it tries to die by just pulling off either one of the plug wires. The carb I have on it is from a kt 17 I already had because I had read on here that the walbros were not too good and that's what the PO gave me. (a walbro allready off) All I did was give my carb a really good cleaning and put it on. I can see it running rough from a carb that's out of adjustment or needs rebuilt but this thing runs ROUGH. Below is the carb I put on. I sure appreciate the help. Thanks Gary,
DSCF2111.jpg
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1973 149 with 44" Deck, 782 with Simms cab, 1966 102 with 38" deck, 50" deck, 5 42" Blade, Brinly 8" 3- point Plow, Brinly 10' Sleeve hitch Plow, Brinly 12' 3-point Plow, 782 Pile, 2-38' Decks, QA-42A,1650 Roller, QA42 Thrower, Kubota BX 2360, 1970 IH one ton 4x4, one 1959 farmall cub restored, two 1949 farmall cub projects, cub grader blade, 5 sickle bar mowers , 1 set cutivators , 1 fast hitch plow, 1. 1950s IH hay rake
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#7
10-28-2012, 09:17 AM
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I never thought to check. That would be a good thing to look at beens the engine is a replacement and obviously the driveshaft was delt with. I'll check and let you know.
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1973 149 with 44" Deck, 782 with Simms cab, 1966 102 with 38" deck, 50" deck, 5 42" Blade, Brinly 8" 3- point Plow, Brinly 10' Sleeve hitch Plow, Brinly 12' 3-point Plow, 782 Pile, 2-38' Decks, QA-42A,1650 Roller, QA42 Thrower, Kubota BX 2360, 1970 IH one ton 4x4, one 1959 farmall cub restored, two 1949 farmall cub projects, cub grader blade, 5 sickle bar mowers , 1 set cutivators , 1 fast hitch plow, 1. 1950s IH hay rake
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#8
10-28-2012, 12:02 PM
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Well the driveshaft was not the problem. I took the driveshaft clear out and it still shakes. What I did discover is that it totally dose not fire on the right side. After running awhile the plug on the left got warmed-up and the right spark plug was still cold. I switched plugs and even tried other plugs with no succsess. It is getting spark but dose not seem to be real hot. Actually neither side seems to be real hot for that matter. Could it be a poor engine ground? The right side is for sure getting gas, as the plug was wet with gas when removed. I took the intake manifold off thinking that maybe a mouse had moved in since I don't know how long the carb had been off before I bought it,but all was clear. While I had the manifold off I turned the motor over and I could see the valve moving as it should. Did I read on here one time that these engines can throw a magnet off? I may be reaching here but I'm all out of ideas. It wouldn't be too hard to pull the engine at this time and check for a throw magnet, because I took the bolts all out of the engine mounting plate to remove the driveshaft and have not replaced them yet. Thanks for your help guys, Gary
P.S. I,m going to blow leaves now and give this some more thought.
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1973 149 with 44" Deck, 782 with Simms cab, 1966 102 with 38" deck, 50" deck, 5 42" Blade, Brinly 8" 3- point Plow, Brinly 10' Sleeve hitch Plow, Brinly 12' 3-point Plow, 782 Pile, 2-38' Decks, QA-42A,1650 Roller, QA42 Thrower, Kubota BX 2360, 1970 IH one ton 4x4, one 1959 farmall cub restored, two 1949 farmall cub projects, cub grader blade, 5 sickle bar mowers , 1 set cutivators , 1 fast hitch plow, 1. 1950s IH hay rake
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#10
10-28-2012, 12:49 PM
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Are you sure, that the Motor is ok? My red MTD 1984, 782, with the KT 17 S2 had the same Problem, as i got it 2008 from the States. The Engine was running, but it had a extrem shaking. I looked at the Carb, Ignition, Spark Plugs, and so on, the Problem was the same, no Solution.
After this all, i removed the right Cylinder Head, and saw, the Piston doesn't work, after removing the Cylinder, i saw, the broken Rod, the Engine was running on one Cylinder, the right Side was dead. Broken Rod, broken Piston, broken Cylinder Wall, scratched Rod Journal, but no Hole in the Block. I rebuildt the Block, got Piston Rings, Undersize Rods, Crank Bearings, Fuel Pump, Carb Kit, and Gasket Set, new from an ebay Dealer, in the States. Some used Parts, Piston, Cylinder, i got from an occ User, for free. (Much Thanks Scott). I brought the Crank to an Engine Shop to turn over. The Engine is running now, how new, and i'm glad to rebuildt the Engine, it's powerfull and runs great, mfg Georg,
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I'm proud to be a German Cub Cadet 782 Owner!!!!
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