1979 John deere Trialfire 340 Problem

JDFanatic19 · Post by **JDFanatic19** » Sat Oct 01, 2011 9:48 pm

I'm having trouble with my trailfire. it started with quick start down the carb, But wont stay running. It has good spark, over 120 compression in both cylinders. So is it my fuel pump or something else?

Liquifire84 · Post by **Liquifire84** » Sun Oct 02, 2011 12:21 pm

When was the last time to took the carb appart and cleaned it all up? I would start here first myself they check for fuel pump, filter, and lines/

JDFanatic19 · Post by **JDFanatic19** » Sun Oct 02, 2011 5:12 pm

well i tryed a different pump. it got the gas in the line but it wont go to carb. It putts but wont start fully. i took carb apart and the bowl had gas in it. but i took bottom off, and the needle in the jet under that gold float dropped on the ground. its the one that has a pin that goes through it. would that cause it as well?

johnnycyclone · Post by **johnnycyclone** » Sun Oct 02, 2011 6:33 pm

I would pull the carb off, disassemble, clean, inspect and then reassemble per specifications in the manual. You want to make sure all the passages are clear, and that all the parts are accounted for. I bought a Traifire 2 years ago that would load up all the time. I found out after taking the carb apart that it didn't have a pilot jet in it. I would also buy a rebuild kit for fuel pump and do a rebuild on the fuel pump. Other wise you might be chasing your tail all winter.

fordmtrsp · Post by **fordmtrsp** » Sun Oct 02, 2011 8:36 pm

I would make sure the crank seals are good and the line that goes from the crankcase to the fuel pump isn't cranked and in good shape.

JDFanatic19 · Post by **JDFanatic19** » Sun Oct 02, 2011 11:05 pm

well i'll see tomorrow when i get the new needle valve and float arm pin.

80spitfire · Post by **80spitfire** » Sun Oct 02, 2011 11:26 pm

I second replacing the impulse line from the crank to the carb cuz that can definitely keep it from pumping gas right.

lwb140 · Post by **lwb140** » Mon Oct 03, 2011 12:13 am

another consideration nwould be crank seals , bad seals can cause all kinds of goofy runability issues . getting these items renewed /replaced will give you a great foundation to begin to fine tune your machine

JDFanatic19 · Post by **JDFanatic19** » Mon Oct 03, 2011 6:25 pm

well i almost had it started. it sucks gas up to half of the line to the carb. i sprayed gas into the carb several times and it almost fired up. But wont actually start.

JD600 · Post by **JD600** » Mon Oct 03, 2011 6:56 pm

You surely have a blown crank seal bud. You gotta get them changed out before you distroy that engine. it will only set you back about $10 and it will onl take a few hours. The crank seals are also a major factor in fuel pump performance. Hope this helps.

DE

Post by **WinnipegStPaul9** » Mon Oct 03, 2011 7:01 pm

What Dustin said!

JDFanatic19 · Post by **JDFanatic19** » Mon Oct 03, 2011 10:04 pm

but would that explain it will still not start with spraying gas into carb? it will putt sometimes, it will almost start sometimes. and sometimes you can hear a burst of air sometimes when it putts

ljm · Post by **ljm** » Tue Oct 04, 2011 5:11 am

yep it would.
Blown crank seals got let the cylinder pull the fuel up into the combustion chamber.

get them changed.

Lloyd

JDT · Post by **JDT** » Wed Oct 05, 2011 7:01 am

What DA said. and every one else.

Crank seals need to be renewed.

JDFanatic19 · Post by **JDFanatic19** » Wed Oct 05, 2011 3:23 pm

so when i get new crank seals in. it will run?

1979 John deere Trialfire 340 Problem

1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem

Re: 1979 John deere Trialfire 340 Problem