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56 MH 444 gas badly backfiring

5

56massey444

New User
My tractor ran good so far this winter,plowed the drive twice and went to start it which it did but backfires bad thru the exhaust,really loud like a gunshot,and a 4" flame with it.
Is it possible there are wires rubbed on the frame or a stuck valve? Im a newbie to tractors,any advise or thoughts would help,Thanks,Ozzy
 
Sounds to me like u have moisture inside your distributed cap!
Spray the inside of ur cap with penetrating oil or wd40!
 
Easy way to check valves, crank over with ignition off, will crank uneven if one cylinder low.

I would expect a cracked cap as others have suggested.
 
(quoted from post at 12:21:02 01/28/19) Easy way to check valves, crank over with ignition off, will crank uneven if one cylinder low.

I would expect a cracked cap as others have suggested.
Click to expand...

Ok so I have a toggle switch for power,up is on and then I push the button to engage the starter,how do I crank it over if the toggle is not on? What do you mean by crank uneven? So a compression test would help?
 
first on the list is a compression check, that way you know if its a valve problem or the valves are good. plus check cap for moisture.
 
Can you leave the ignition off but still crank the engine on the pushbutton
starter? If not, pull the coil wire off and crank the engine with the starter
button. It should go rr--rr--rr--rr evenly, not rr-rr-rrrrr-rr-rr..the uneven
cranking would indicate a low compression on that cylinder.
Ben
 
Have you had the plug wires off?
If so check the firing order and rotation at distributor. I had a MF 230 gas (Z134 continental engine) that backfired bad low power etc. Found out I
had the firing order on the cap right, BUT I had it set up for clockwise rotation not counter-clockwise. This crossed #2 and #3 because i had the
rotation wrong. Runs and starts very good now.
 
On a "original" 44, just push the starter button in, leave ignition and choke off, if the engine cranks smooth then no need for compression check.
 

Some great suggestions here,yes I will do a compression test,hopefully that will be good.The cap and rotor seems fine,the plug wires will be replaced.
Its there any possible way it could be the carb or governer causing it? Thanks
 
no way a carburetor or governor will cause a backfire. its to do with the valves and timing. burned valves, wires mixed up, camshaft problem.
 
(quoted from post at 18:23:15 01/28/19) first on the list is a compression check, that way you know if its a valve problem or the valves are good. plus check cap for moisture.
Click to expand...

I finally got a chance to do a compression test today and it revealed 50 PSI on all cylinders,is this normal? It seems low to me.The points were burnt and dirty so I replaced them with new ones and the condenser,fired right up and the old girl runs like a top again. Thanks to all for the suggestions. Ozzy
 
After doing the compression check like Dieseltech suggested, do another compression just like it but squirt some engine oil into the cylinder you are testing to see how much of a increase in compression you get.
 
Well I got a chance to work on the 444 since its warm again,did a compression test and all cylinders were 50 psi,replaced the
points and condenser and bingo it runs excellent now.Thanks for the help guys. Ozzy
 
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