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Thread: 300R nonsense thread
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10-19-2018, 06:18 PM #61Member
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I got a price today for a 225 pro xs v8 fully rigged for $20,142.68 . Unfortunately my hull is rated for 225 and no one wants to sell me a 250. I'd love to hear that these new v8's can be tuned to make the full 300hp.
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10-19-2018, 10:13 PM #625000 RPM
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175-225 use the smaller throttle body and 250-300 use the larger throttle body, so only the 250 will be able to be turned up to 300 with just a tune. Though a throttle body swap may be possible on the 200&225 as the intake part # is the same on the less powerful V8s.
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Jamie Nichols liked this post
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10-20-2018, 01:12 AM #63Member
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10-20-2018, 06:27 AM #646000 RPM
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10-20-2018, 07:14 AM #655000 RPM
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https://www.mercurymarine.com/en/us/.../parts-catalog
https://public-mercurymarine.sysonline.com/iOS/Default.aspx?sysname=NorthAmericacompany=GuestNA_KEY=NA_KEY_VALUElangIF=englangDB=eng
They show two different part # throttlebodies, a 64mm and 80mm.
They also have two different design intakes now listed I noticed a single piece and a two piece.Last edited by PRE-Z06; 10-20-2018 at 07:19 AM.
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Jamie Nichols liked this post
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10-20-2018, 04:46 PM #66Member
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It's interesting that they show 2 different intake systems listed as design #1 and #2.
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10-20-2018, 06:10 PM #67
As far as i know the coast guard spec sticker is only required when boat is sold new. I have owned several under 21 ft boats that i seemed to have lost the coast guard plate.
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engineermike liked this post
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10-20-2018, 06:29 PM #685000 RPM
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10-20-2018, 09:32 PM #69Member
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What do you guys think about the v8's having a counter ballancer running off of the timing chain? I keep picturing it coming apart if someone hit something solid with the prop.
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10-21-2018, 12:39 PM #705000 RPM
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Eh, I'm not worried. You would probably blow up the lower unit before the timing chain comes apart or skips. Besides there are alot of v8s with balance shafts that seem to be just fine.
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10-25-2018, 08:39 AM #715000 RPM
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10-25-2018, 10:20 AM #72Screaming And Flying!
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its will be old fashioned before most get one?
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11-01-2018, 11:03 AM #73
How many 4 stroke chain saws are out there.. yep some things like stvs and allisons were just meant to be powered by 2 strokes. anyone can have my spot on the buyers list im out...
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22R liked this post
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11-07-2018, 03:42 PM #746000 RPM
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It’s tough to make 4-stroke oiling work on a chainsaw that must operate in any orientation. Apparently stihl is doing it though. Anyway, luckily, outboards don’t need to operate upside down or on its side.
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11-07-2018, 05:17 PM #75
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