742B running issues

Help Support SkidSteer Forum:

wings5j

Well-known member
Joined
Jan 7, 2008
Messages
190
Hi to you all, I am brand new to the forum, and fairly new to the Bobcat. I have a '93 742B with a gas Mitsubishi 4G32 engine. Lately I have been using it to plow snow and it goes from running great to acting like it it running out of gas. Usually it starts right up again, but has been getting more troublesome. On possibly a related note, my shop smells like gas fumes when the Bobcat is stored inside. I don't notice any leaks. Tonight I bypassed the fuel pump and installed an electric pump but that does not seem to be the issue. Any ideas will be appreciated. Thanks, John
 

Fishfiles

Well-known member
Joined
Feb 8, 2007
Messages
1,698
Hi to you wings5j , from what you say I would look at the carb , it may need a cleaning out , or have a bad gasket on it , it could be dripping down into the engine when parked and thats what you smell
 

Tazza

Moderator
Staff member
Joined
Dec 7, 2004
Messages
16,840
Hi to you wings5j , from what you say I would look at the carb , it may need a cleaning out , or have a bad gasket on it , it could be dripping down into the engine when parked and thats what you smell
If you can smell fuel fumes it does point to the carb. I'm not sure if they use float valves or not, but i would start there as they control the amount of fuel that goes to the reserve in the carb. It wouldn't be a bad idea to pull it down and clean it.
 
OP
OP
wings5j

wings5j

Well-known member
Joined
Jan 7, 2008
Messages
190
If you can smell fuel fumes it does point to the carb. I'm not sure if they use float valves or not, but i would start there as they control the amount of fuel that goes to the reserve in the carb. It wouldn't be a bad idea to pull it down and clean it.
Thanks guys, I will pull the carb and go from there. I will be sure to post my results once I get a handle on what's going on. Hopefully soon, it's snowing like crazy here ;-) John
 
OP
OP
wings5j

wings5j

Well-known member
Joined
Jan 7, 2008
Messages
190
Thanks guys, I will pull the carb and go from there. I will be sure to post my results once I get a handle on what's going on. Hopefully soon, it's snowing like crazy here ;-) John
I took the carb apart and cleaned it as best as I could, put it back together and installed it. When I first tried to start it, I didn't get anything. Sight glass on the float bowl showed fuel had reached the carb. I filed the points and also cleaned some corrosion off of the rotor and cap, sprayed a shot of starting fluid, and it started right off. It ran better than it has in awhile and spent about an hour plowing snow with no troubles. I have a tune-up kit on order but it takes 4 or 5 days to get stuff from the factory (look for my new thread about parts cross-reference). Thanks for the help. John
 

Tazza

Moderator
Staff member
Joined
Dec 7, 2004
Messages
16,840
I took the carb apart and cleaned it as best as I could, put it back together and installed it. When I first tried to start it, I didn't get anything. Sight glass on the float bowl showed fuel had reached the carb. I filed the points and also cleaned some corrosion off of the rotor and cap, sprayed a shot of starting fluid, and it started right off. It ran better than it has in awhile and spent about an hour plowing snow with no troubles. I have a tune-up kit on order but it takes 4 or 5 days to get stuff from the factory (look for my new thread about parts cross-reference). Thanks for the help. John
If it needed a snort of starting fluid it sounds like you have a problem with the choke.
 

Latest posts

Top