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Thread: Mirage, 260 setup
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08-03-2021, 08:52 PM #31
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08-04-2021, 08:25 AM #32Screaming And Flying!
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Correct! Top dead center 0° BACK the motor off to 150,000 that will be 25 degrees.
If you mark the fly wheel for all six cylinders that will be called indexing the fly wheel.
That way you can check the timing at all cylinders make sure your system is firing properly. If you have a hole that is firing too early that can cause a major problem ( detonation)if it’s firing too late you’re losing power. If there is a problem the first suspect is switch boxes.
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08-13-2021, 07:42 PM #33
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08-13-2021, 09:42 PM #34Screaming And Flying!
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Did you use the dial indicator to find top dead center and then adjust your pointer at zero? It looks like it’s about 24°?
Last edited by Stoker boy; 08-13-2021 at 10:05 PM.
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08-13-2021, 10:00 PM #35
Yes got it to TDC and the pointer was dead on 0. Rotated counter clockwise 150,000 and that's where the pointer ended up in comparison to the 25° mark.
Can't Never Could Till It Tried
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08-14-2021, 08:40 AM #36
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duckrazee liked this post
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08-14-2021, 09:36 AM #37
I have checked the horn barb. It's clear! Haven't checked out the hose to ECU yet. Will do that today.
Can't Never Could Till It Tried
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08-14-2021, 10:48 AM #38
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08-14-2021, 02:59 PM #39
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08-14-2021, 05:28 PM #40Screaming And Flying!
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Now do that same procedure ( 0….25 )on number 2 3 4 5 6. It’s a pain I know but it will let you know if you’re firing properly at the remaining cylinders.
Last edited by Stoker boy; 08-14-2021 at 05:31 PM.
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duckrazee liked this post
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08-14-2021, 05:47 PM #41
Just finished repeating the steps on the other 5 holes. All 6 appear to be firing dead on 25°. It is a pain, but wanted to make sure! So timing doesn't appear to be an issue
Can't Never Could Till It Tried
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08-14-2021, 06:00 PM #42
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08-14-2021, 07:19 PM #43Screaming And Flying!
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It will be night and day difference. The motor will idle pig rich if any of those lines are clogged because the vacuum disappears and the ECU is telling the injectors to go full rich. The boat will run at wide-open throttle but at lower RPM and idle it will be pig rich.
You should be able to depress the throttle and have a slight bit of play before the butterfly opens that will give you somewhere between 2— 4 degrees of advance timing.
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duckrazee liked this post
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08-14-2021, 07:32 PM #44
It will be like a new motor. Make sure that barb is clear. Be easy on the trim put the motor 1” above go up 1/8” at a time until you lose water pressure. Put a good Jacket on have someone on a chase boat for testing. Flat is fast don’t mess with the timing less is more with the fuel these days. It should still go mid teens with a 28-30 pretty easy.
Last edited by baja200merk; 08-14-2021 at 07:37 PM.
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duckrazee liked this post
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08-14-2021, 08:00 PM #45
This is part of the hose I cut out. Sucker was stopped plumb up. Cleaned it out with a piece of coax, and some air. It's flowing good now. I've got quite a few props to try on it. 14x28 cleaver, 14.5x30 cleaver, 14x26 drag, 14x22 drag. Have only run it with the 30 cleaver so far. Obviously didn't like it too much the way it was running.Can't Never Could Till It Tried
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