Author Topic: My 7300 went kapoot!  (Read 489 times)

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Offline Ducksnuff870

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Re: My 7300 went kapoot!
« Reply #50 on: December 03, 2014, 06:34:26 pm »

7900 P&C plus gasket and bearing will run around 220. from memory the 7300 piston is $90 so figure $100 for the piston, gasket and bearing. here is your chance to upgrade even if you foot the bill for half  of a new P&C i think it would be money well spent.
Do you have a number to call to place an order or just go thru your website?

Offline Cut4fun .

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Re: My 7300 went kapoot!
« Reply #51 on: December 03, 2014, 06:40:13 pm »
Make sure you figure out why she went lean before just slapping a new top on her.
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Offline Ducksnuff870

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Re: My 7300 went kapoot!
« Reply #52 on: December 03, 2014, 06:42:34 pm »

Make sure you figure out why she went lean before just slapping a new top on her.
yea I saw somebody said pressure test. You wanna look at it?

Offline Cut4fun .

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Re: My 7300 went kapoot!
« Reply #53 on: December 03, 2014, 06:46:35 pm »

Make sure you figure out why she went lean before just slapping a new top on her.
yea I saw somebody said pressure test. You wanna look at it?

I dont have a pressure testing set up and I check seals with the top off. Batting 100% for that so far and my redneck way.

My problem is getting time right now till I am caught up around here.
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Offline 660magnum

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Re: My 7300 went kapoot!
« Reply #54 on: December 03, 2014, 07:00:36 pm »
To pressure check, the saw has to be all together.

You seal off the exhaust port behind the muffler and between the carb and the boot.

I have a pressure checker if you'll seal it up and bring the saw over. We can connect it up through the impulse line.
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Offline Ducksnuff870

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Re: My 7300 went kapoot!
« Reply #55 on: December 03, 2014, 07:03:43 pm »
Ok where are you located? How do you seal it off? I'll have you or kevin test it

Offline Nathaniel Vansickle

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Re: My 7300 went kapoot!
« Reply #56 on: December 03, 2014, 07:08:22 pm »
ideally you pressure and vac test before any disassembly. get a old inner tube and cut a piece for between the muffler and cylinder and for between the carb and intake. pump up through the impulse hose. cheap mighty vac at autozone is only $20 or so. it only does vacuume which will tell you if you have a leak but be difficult in most cases to find it.

had to modify my post a bit...having one of those days

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Offline 660magnum

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Re: My 7300 went kapoot!
« Reply #57 on: December 03, 2014, 07:14:34 pm »
The cheap MityVac is considered to only do vacuum but with a car vacuum/pressure gauge and a check valve you can do pressure with one too.

The pressure value as said is 7 lbs. Pressure works best for boots and gaskets. You can check with soap bubbles.

Seals are better checked with vacuum. The value is 15" and all seals leak but your test pass-fail is that the saw still has 10" vacuum after 30 sec.
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 Nathaniel Vansickle

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Re: My 7300 went kapoot!
« Reply #58 on: December 03, 2014, 07:38:47 pm »
The cheap MityVac is considered to only do vacuum but with a car vacuum/pressure gauge and a check valve you can do pressure with one too.

The pressure value as said is 7 lbs. Pressure works best for boots and gaskets. You can check with soap bubbles.

Seals are better checked with vacuum. The value is 15" and all seals leak but your test pass-fail is that the saw still has 10" vacuum after 30 sec.

yep i had it backwards. long day i will fix my post
5105H and 6400H in stock

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Offline 660magnum

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Re: My 7300 went kapoot!
« Reply #59 on: December 03, 2014, 07:51:38 pm »
If the truth was known . . .

Most people can pretty much suck close to 15" vacuum. But to use this ability, you would need the above mentioned check valve and automotive vacuum gauge from Harbor Freight.

http://www.harborfreight.com/fuel-pump-and-vacuum-tester-93547.html

http://www.advantagehobby.com/63357/FOR150/

And some tubing
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
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