Author Topic: 290/310/390  (Read 601 times)

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Offline jmester

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290/310/390
« on: December 15, 2014, 07:41:56 pm »
Going to build a 390 over the next couple of weeks. I would imagine that a muffler mod helps. Would a timing advance also be in order. Have not messed with these saw much so I am all ears. Looks like it is going to be a fun build.
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Offline 660magnum

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Re: 290/310/390
« Reply #1 on: December 15, 2014, 07:46:11 pm »
File about half the flywheel key away to advance the flywheel that much.

Will not be enough to cause more kicking on start but will increase performance a little.
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Offline Cut4fun .

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Re: 290/310/390
« Reply #2 on: December 15, 2014, 07:46:24 pm »
20% just from a 30min muffler mod. Never messed with timing on stock saws.

Offline 660magnum

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Re: 290/310/390
« Reply #3 on: December 15, 2014, 07:48:52 pm »
With the muffler mod, you not only open up the outlet, you need to open up the cage at the muffler inlet too.
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Offline Cut4fun .

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Re: 290/310/390
« Reply #4 on: December 15, 2014, 07:50:52 pm »
Yep I do that. Might have a pic somewhere.

Offline jmester

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Re: 290/310/390
« Reply #5 on: December 15, 2014, 08:33:49 pm »
I did a 361 muffler not long ago I cut the muffler in half and cut the cage all the way out and increased the outlet hole and brass brazed it back together. That saw really picked up a lot in my mind any way. Glad you mentioned how you guys have done it. Was just thinking to open up the outlet only. Usually do a 1/3 the key is that not enough on these. Just wanted to make sure 1/2 is what you mean. Thanks guys
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Offline Cut4fun .

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Re: 290/310/390
« Reply #6 on: December 15, 2014, 08:36:26 pm »
I never opend the 290 310 390 muffler. I drilled right through center of cage. Only thing in front then is deflector.  I also opened above and below cage, that way all would stay under deflector.
Then only remove a little on the exit of deflector itself.

Offline Cut4fun .

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Re: 290/310/390
« Reply #7 on: December 16, 2014, 01:30:01 pm »
I open deflector at a angle just a tad. Dont want my muffler mod going straight out the front like some do.




Offline jmester

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Re: 290/310/390
« Reply #8 on: December 16, 2014, 03:11:02 pm »
Looks good thanks for posting. Will give it a go like that.
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Offline jmester

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Re: 290/310/390
« Reply #9 on: December 16, 2014, 04:15:18 pm »


Before cleaning
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