Author Topic: 290/310/390  (Read 612 times)

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Offline jmester

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Re: 290/310/390
« Reply #20 on: December 16, 2014, 09:21:04 pm »
Tomorrow I will shot a couple of pics removing the crank bearings. Have almost all the parts. Waiting on mako piston and cylinder kit, crank bearings. Piston pin bearing, crank seals. Fuel line and some other small parts. I will also take some pics when I get to the muffler mod. Going to go with cut4funs outlet design. Thinking I am going to cut the muffler in half and take the cage out and braze back together.
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Offline jmester

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Re: 290/310/390
« Reply #21 on: December 16, 2014, 09:22:04 pm »
Thanks 660.
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Offline jmester

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Re: 290/310/390
« Reply #22 on: December 17, 2014, 07:16:15 am »


Began my muffler mod work. I put the muffler in the vice and used a flat file and went around the top of the seam. Once you go all the way around the two halves fall apart.
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Offline jmester

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Re: 290/310/390
« Reply #23 on: December 17, 2014, 07:18:37 am »


This is with the cage removed all you need is the 2 dowels off the sides of the cage.
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Offline jmester

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Re: 290/310/390
« Reply #24 on: December 17, 2014, 07:29:19 am »
What I have left to do is drill some holes for the outlet. Mod the deflector and braze back together. This one went better then the 361 muffler I did. Used a 4" grinder with cut off wheel to split that one. A little hard to control. With filing the seam off make a nice tight joint to braze back together.
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Offline 660magnum

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Re: 290/310/390
« Reply #25 on: December 17, 2014, 07:45:36 am »
I liked the brazing better but brass will not stick to black oxide or cadmium. You have to remove the coating where you want the brass to stick.
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Offline Cut4fun .

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Re: 290/310/390
« Reply #26 on: December 17, 2014, 12:26:19 pm »
Nice work on the muffler and clam base.  Top notch.   8) 8)

Offline jmester

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Re: 290/310/390
« Reply #27 on: December 17, 2014, 03:23:49 pm »
Thanks guys. Do you all think that the cylinder where it meets the engine pan should be flatten as well?
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Offline 660magnum

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Re: 290/310/390
« Reply #28 on: December 17, 2014, 03:32:36 pm »
I did do mine and I found just a little distortion that was not as bad as the pan portion.
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Offline jmester

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Re: 290/310/390
« Reply #29 on: December 17, 2014, 03:39:59 pm »
Ok thanks. I will go over it just to make sure. Seems the 390 kit is back ordered. Thinking of going with the 290 kit instead.
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