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08-12-2019, 09:28 AM #16
you have a idle jet and a off idle jet , then you have fuel screws in leans out richens. Set at 1 1/2 out caps on then you can go to 1 1/4 or 1 3/4 will give you what you need for changes in elevation according to merc chart
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08-13-2019, 08:28 AM #17Member
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I did not remove welch plugs and air trim screws due to lack of knowledge. I only removed 9 stationary jets and 2 idle adjustable needle springs. After reviewing the manual again I see they say 1 1/2 turns out for idle mixture not 1 1/4 then place plastic cap as you state. So I will have to pop the caps and redo them to 1 1/2 out. It sure did run smooth at 1 1/4.
So when I have both engines completed what is the final adjustment procedure for the 2 idle adjustable needle springs on each carb? Do they need fine tuned? Thanks for your help
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08-13-2019, 08:53 AM #18
Don't remove Welch plugs they are a bitch to put back in. If your at 1 1/4 at sea level your probably correct
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08-13-2019, 09:59 AM #19Member
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08-13-2019, 12:18 PM #20
584 is good i,m at 1300 ft and i,m at 1 3/4 turns out
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08-13-2019, 07:21 PM #21Member
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08-16-2019, 03:33 PM #22Member
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So I found out the port motor is a wmh 28 not a wmh 30. The jets are all different. Do I just install the 30 or rebuilt the 28s? I'm going to put it back together for now. Thanks
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08-16-2019, 03:57 PM #23
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08-16-2019, 04:32 PM #24
wmh 28 year 1993 ,.62 main .70 off idle .56 idle no back draft
wmh 30 year 1994/5 .66 main .50 off idle .54 idle .84 back draft
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08-16-2019, 04:57 PM #25Screaming And Flying!
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Just for ya info.... should not take the blades off the shaft.....be careful to set em so they close properly..... and use red lock tite.....
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08-16-2019, 09:12 PM #265000 RPM
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I agree with ya for something like pistons, but have yet to see a fiber gasket melt. I have used Sierra products for years with almost zero issues, I listed glm only ' cause it was what was listed as what they have available on their website. I check fiber carb gaskets for loose crap hanging from surfaces before install, and have seen" loose crap "on oem and aftermarket alike.
Sorry to hear you had bad luck with them. Thanks for the heads up!
Wonder if anyone else has experienced problems similar to yours?
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08-17-2019, 06:16 AM #27Member
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08-17-2019, 06:59 AM #28
I'm curious also If anyone has had a gasket kinda melt apart , I sure wish I'd took pics but I didnt , sierra is fine on most stuff to ,but that was my 1 and only glm part that was n rebuild kit i had got , .maybe it was just bad luck, but they looked and felt fine when i put it together
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08-17-2019, 07:24 AM #295000 RPM
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Maybe start a thread?
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08-19-2019, 11:05 AM #30Member
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Well I ordered parts to rebuild the 28 carbs since the part #s are different for the carbs themselves vs the 30s.
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