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Discussion Starter · #1 ·
Hi Gang - been lurking here since i bought used 425 in June. Ran rough right from the start (missing under load after 30 mins of work) but plugs, air and fuel filter seemed to much improve. Fast forward to last night, ran OK for 15 mins and then every time I hit a bump, it would miss. This went on for 1/2 hour untill the miss became very bad and when I tried to idle the motor it stalled and wouldn't restart unless I applied full fuel and choke, hasn't done this before but the miss never completely went away even after the plugs, etc.

Any thoughts before I send her to the shop? I'm handy with tools but not a small engine mechanic by any means.

Thanks - Jim
 

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I feel your pain I am also a recent 425 owner myself and still trying to diagnose intermittent spark on the left side. I just put up a post myself looking for help. Maybe we can learn togeather from the kindness of someone on this site.I am a small engine mech. most of my life old school the newer high tech. stuff puzzels me but im trying. BILL
 

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Hi olks,

I've been hunting for my 425 woes for about 2 years. Finally fixed this summer. The TDM Module, Time Delay Module can cause spark problems.

Regarding a rough left cylinder problem, my trouble turned out to be a leaky intake manifold, causing coolant to find its' way into the left cylinder.

To find this, you need to pull the plugs on both cylinders, but do not start the engine at the beginning of the day to see if coolant has leaked into the cylinder over night. Manually turn the engine over to see if there is any liquid in the cylinder.
 

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Discussion Starter · #5 ·
Thanks for the thoughts guys - gonna try drilling a small hole in the top of the gas cap per a suggestion from one repair guy and if that dosen't work i'll likely send her to the shop.
 

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Thanks for the thoughts guys - gonna try drilling a small hole in the top of the gas cap per a suggestion from one repair guy and if that dosen't work i'll likely send her to the shop.
The 425 does not have a vented gas cap, the vent is through a hose on top of the tank. Drilling a hole in the cap won’t hurt anything but likely will not solve anything unless your vent tube is plugged.
 

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Replacing the inexpensive Time Delay Module has helped a lot of owners with similar sounding issues. It's hard from long distance to diagnose what you're experiencing, but the TDM may be a quick fix.
 

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The description of "every time I hit a bump it would miss" would lead me to believe it has something to do with either a position of a wire (could be a nearly broken connection) or gravity affecting fuel delivery. I would check all wires for good connections and then check the hoses to see if there are any cracks in them. Clean connections and replace cracked hoses to start.
 
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