Author Topic: Replaced piston/cylinder now won't fire  (Read 1041 times)

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Offline wbhburn

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Replaced piston/cylinder now won't fire
« on: October 19, 2013, 12:23:26 pm »
20 yr old Husky 359 piston seized and I replaced it and cylinder with no parts left over :-). Tried to start afterward but wouldn't fire despite having spark and fuel flowing out the line when removed to check. Watched a U-tube on the repair and realized I should have paid more attention to intake manifold and carb installation. Removed and reinstalled both. Still no fire even with a whiff of starting fluid. What could it be? I'm not a 2 cycle guy so I don't understand the principals. What's the tube on the manifold for (impulse, what's that?)? Anyway I could blow through it. Rubber manifold didn't seem to have cracks or leaks. Made sure the band was fastened. I tried to ensure the little stub (orifice) on the manifold was fully engaged in it's counterpart on the intake port but when I felt inside the assembly it was smooth except on the bottom where the stub should mate (it was slightly raised there). That assembly not being properly seated is all I can think of, should it feel perfectly smooth all around the inside of that throat?

Help?

Bill

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Offline Cut4fun

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Re: Replaced piston/cylinder now won't fire
« Reply #1 on: October 19, 2013, 12:37:35 pm »
Welcome.  Are you sure you want your email as your username?  Can shorten for you to wbhburn


Also put some mix into a squirt can or bottle. Use that to prime, not ether starting fluid.


Are you getting spark?  on/off is on.  Just asking cause you never know. Did it before myself.
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Online jmester

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Re: Replaced piston/cylinder now won't fire
« Reply #2 on: October 19, 2013, 12:43:43 pm »
Is the spark plug moist at all? And did you figure out why the last piston and cylinder went bad
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Offline 660magnum

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Re: Replaced piston/cylinder now won't fire
« Reply #3 on: October 19, 2013, 12:46:09 pm »
did those old 359'shave the plastic boot clamp?
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
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Offline Cut4fun .

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Re: Replaced piston/cylinder now won't fire
« Reply #4 on: October 19, 2013, 01:01:19 pm »
Old 359 had that plastic clamp.  If you didnt update that you need to.  Probably what fried it to begin with.
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Offline 660magnum

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Re: Replaced piston/cylinder now won't fire
« Reply #5 on: October 19, 2013, 01:38:21 pm »
There's another situation with that line of saws is that the threads strip out of the carb end of the boot real easy if you are heavy handed.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline wbhburn

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Re: Replaced piston/cylinder now won't fire
« Reply #6 on: October 19, 2013, 02:03:17 pm »
Wow, what great response already!

Cut4Fun- Squirt bottle; got it!, Spark; yes, Update plastic; will do after this weekend but like to get it running first.

Jason - Plug not moist, don't know why is seized. running along fine at high rev in middle cut and stopped on a dime. No other symptoms.

660mgnum - Plastic boot retainer; yes, threads not stripped (yet).

All, what's with the little hose on the manifold? What's impulse?

Offline wbhburn

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Re: Replaced piston/cylinder now won't fire
« Reply #7 on: October 19, 2013, 02:10:02 pm »
Oh yeah. Please address this question...

the only concern I had when reassembling was the "lump in the throat" of the intake. After putting on the manifold, I felt around inside the joint with my finger and it was smooth and apparently mating well except at the bottom (just above where that little projection on the manifold is supposed to go into the indentation on the port). It was raised slightly there. Could that be the problem? There is a small orifice on that protrusion that connects with the little tube thing. Could that not being seated properly cause the problem?

Offline wbhburn

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Re: Replaced piston/cylinder now won't fire
« Reply #8 on: October 19, 2013, 02:59:00 pm »
I took it apart again and ensured the manifold was properly seated against the I-port. Also noticed the cyl. gasket is directional. Don't know it was backwards the first time but made sure the notch was in the rear. Hoping that was the problem but STILL WON'T FIRE AT ALL. :'( BTW, I'm getting pretty good at removing the cylinder.

Offline wbhburn

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Re: Replaced piston/cylinder now won't fire
« Reply #9 on: October 19, 2013, 03:16:20 pm »
Yes, please do shorten. I tried but couldn't figure it out. Can it only be done from admin end?

 

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