Engine Miss Over Bumps

[donnelly.me]

My 149 seems to have a problem with the engine missing when I am traveling over bumps or rough terrain at full throttle and full speed or half speed. I think I might be running out of fuel? I know that the 149 has a gravity fed fuel system so a checked to make sure the fuel line has a good slant from the tank to the carb. i did install an inline fuel filter could this be hampering delivery too much? Also, I am not a carb guy but would the float bouncing around have something to do with this? I have the carb at the suggested settings and on pavement or smooth surfaces it runs like a bear. I also checked the RPMs at full throttle and I have it set to about 3500 max instead of 3600 because she is old and I dont want to rebuild the engine! Any ideas would be a help. Thanks, mark

[teejk]

are your engine grounds clean and tight? how about the wire from the points to the coil (I guess a bump could cause it to ground out somewhere)?

[donnelly.me]

I checked all the leads and grounds for the engine and they were all tight and clean. Maybe miss isnt the correct term.. Engine sputter?? Mark

[Sam Mac]

Probably fuel sloshing around in the carb. Go slow over bumps problem solved.

[teejk]

shouldn't have to go slow! if it's fuel related and it used to work, I have to opine that there is plenty of vacuum on the engine to pull fuel out of the bowl into the carb throat. But I speak from 1250 experience.

the "bump" makes me wonder whether there is a short on the coil wire from the points (I've learned the hard way to start with the cheap easy stuff). VOM check on the wire to make sure there isn't a section of bare wire somewhere. other people will chime in with how to do that in a case where it may be "intermittent".

[donnelly.me]

I didn't check the wire from the points to the coil for bare spots. I will do that tomorrow. As far as my plug wire goes it fits both sides nice and tight but it is longer than the oem wire. It is a spare that I had. Now for the float spring, is this add on part or a replacement part? The tractor had done this since I got it running and now I'm trying to work out all the small.issues. thanks, mark

[David a Calkins]

there is a compression spring for this problem ,sits under float kohler #M47422 .hope this helps .David

[Mainecubcadet108]

Does your plug wire snap on to the plug nice and tight or is it loose fitting same with the coil end of the wire.I had a wheelhorse that would sputter or miss when id go over bumps found out the plug wire would jump around on the plug and lose fire to the plug just a thought

[teejk]

the plug wire would be my next choice (and easy enough to pull and do a cont check). if it passes the cont check, spread the coil end and slight crimp on the plug end. a little WD40 on both connections shouldn't hurt anything.

[David a Calkins]

the spring keeps the float level ,so you won,t rin out of fuel