Author Topic: 78 intruder runs then dies when warmed up  (Read 2557 times)

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mswyka

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Re: 78 intruder runs then dies when warmed up
« Reply #15 on: February 20, 2017, 05:38:32 PM »
Compression check?
Intruders:  1978, 1979, 1980, 1981 Custom
Invaders:  1979 340, 1980 440, 1980 440 TOC Custom
Projects:  1979 Invader 340, 1980 Invader 340, 1979 Intruder 440, 1982 Intruder 440, 1980 Drifter 340 F/C, 1972 Panther 303 ...

mswyka

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Re: 78 intruder runs then dies when warmed up
« Reply #16 on: February 20, 2017, 06:28:34 PM »
It may be running rich.  The stock intruder jetting changed from year to year.  We jet ours with 25 pilot, 150 main, and 120/130 econojet. 

Also, check the little rubber "O" rings on the bottom of the needle jet.  If they are not sealing correctly they can leak excess fuel and cause the sled to run poorly.  Good at idle, but won't make power at higher throttle.
Intruders:  1978, 1979, 1980, 1981 Custom
Invaders:  1979 340, 1980 440, 1980 440 TOC Custom
Projects:  1979 Invader 340, 1980 Invader 340, 1979 Intruder 440, 1982 Intruder 440, 1980 Drifter 340 F/C, 1972 Panther 303 ...

Boomologist

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Re: 78 intruder runs then dies when warmed up
« Reply #17 on: February 20, 2017, 06:48:27 PM »
How's the engine temp after running for awhile? Do you let it warm up before putting it under a load?

Boomologist

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Re: 78 intruder runs then dies when warmed up
« Reply #18 on: February 20, 2017, 10:32:58 PM »
after it bogs down does it have good spark to both plugs? Are plugs new?
I had an invader that would do what your sled is doing and traced it down to a coil that would quit when it got warm. Plugs will do that also.

intruder440

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Re: 78 intruder runs then dies when warmed up
« Reply #19 on: February 25, 2017, 07:05:40 PM »
Hi guys, sorry for the late reply. im planning to work on it a bit tomorrow. Im limited to just the basics as all my snow is gone. ill try a few things and let you know. thanks again

mswyka

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Re: 78 intruder runs then dies when warmed up
« Reply #20 on: February 26, 2017, 06:35:35 AM »
I hear you about snow being gone.  We have been over 60 for the past week and anything that was left was wiped out by yesterday's thunderstorm.  Now is a good time to pull the engine apart to get ready for next year.
Intruders:  1978, 1979, 1980, 1981 Custom
Invaders:  1979 340, 1980 440, 1980 440 TOC Custom
Projects:  1979 Invader 340, 1980 Invader 340, 1979 Intruder 440, 1982 Intruder 440, 1980 Drifter 340 F/C, 1972 Panther 303 ...

intruder440

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Re: 78 intruder runs then dies when warmed up
« Reply #21 on: February 27, 2017, 08:32:05 PM »
ya thats pretty much where im at, loose motivation pretty quick when theirs no snow :(

Hayastusa

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Re: 78 intruder runs then dies when warmed up
« Reply #22 on: March 20, 2018, 09:03:40 PM »
I have a 78 Intruder with the same issue. It's not a shortage of fuel because priming it while it bogs doesn't fix it, in fact floods it out completely. Let me know if you've solved the problem.