Johnson 300GT VRO

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Hystik DK

Cadet
Joined
May 3, 2002
Messages
6
Can any one help me, i need some info on a johnson 300GT VRO V8?? I bought this used outboard, but i know next to noting about it. I was told it is an '86 but i'm not really sure.<br /><br />Where is the serial # located?<br />Where can i get an owners and/or a repair manual?<br />What is the FOT RPM MAX??<br /><br />The motor sits on a 21" v-hull that probably weighs around 2000lbs, it max'es 3000 RPM's and goes around 50mph (on the log) with an aluminum prop. is that optimal, if not, what is?<br />I would love to get suggestion for a Stainless steel prop?<br /><br />Hope for help :confused: <br />Martin the novice
 
L

lakerunner

Seaman
Joined
Jan 14, 2002
Messages
57
Re: Johnson 300GT VRO

Check on the left side of the engine bracket for the s/n and m/n. I think the max RPM at WOT should be around 5000-5500.
 
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Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: Johnson 300GT VRO

Cool motor. But I doubt that 3000 is WOT. They make very little power at that RPM. Lets check out the tach first and make sure it's correct. Make sure it's an OMC and it's on position 6. <br /><br />Look at the top of either head gasket and tell us what it looks like. The 3.6 (small bore) will have a straight tang sticking out. The 4.0 has a notch cut in it. Either are great motors. The rev limiter is either at 6100 or 6700 RPM. Most likely 6700.<br /><br />Good luck!
 
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Spidybot

Lieutenant Commander
Joined
Apr 4, 2002
Messages
1,734
Re: Johnson 300GT VRO

Hi Martin.<br /><br />Your motor is quite rare in Denmark.<br /><br />The 1989 specs (with Johnson trademarks) for it are<br /><br />4 litre V-8 in 90 degrees<br />224 kw (measured on the prop axle) @ 6000 rpm <br />Servo steering<br />Command Center(R) remote controls with alarm<br />Electronic QuickStart(R) with CD ignition<br />VRO(R) variable oil mix<br />Top Charge(R) 15/35A marine alternator with regulator<br />S.L.O.W.(R) speed reduction overheat system<br />TNT(R) Trim tilt<br />Deep Guard(R) anti corrosion<br /><br />Depending on leg length weight is 251,7 to 263,1 kgs.<br />Bore 93,6 mm<br />Stroke 72,6 mm<br />12v electrics<br />Max rpm range 5750-6250<br />Gear ratio 17:30<br />Four double carburettors<br />Water cooling with automatic thermostat and pressure regulator<br />Standard delivery was without propeller<br /><br />List price in 1989 was 142.000 kr. although nobody paid that much for it.<br /><br />I've seen the Fletcher 21' with outboard but have no specs for it. It was sold in 79/80 with 233 Mercruiser which (1400 kgs. incl. engine). Length is 6,50 m, beam is 2,18 m. It was made first in 1974 and established a new record for it's type of 79,6 mph on Lake Windermere.<br /><br />In Denmark this boat is not very common and due to rather high running costs (as they were all powered pretty high and extremely expensive insurance), they normally spent only one or two seasons with each owner.<br /><br />As a weight of 1400 kgs. + trailer exeeded most (Danish) car's towing abilities, not many of these have been trailered.<br /><br />Good luck with her and watch your wallet ;)
 
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Hystik DK

Cadet
Joined
May 3, 2002
Messages
6
Re: Johnson 300GT VRO

Thank you very much for all the info!... and so fast :)<br />I mis-posted the WOT, i does max 6000RPM, as is.<br />I need to get the boat out of it's winter covers to look for the numbers, but i'll definetly be back as soon as i get them!<br /><br />Can you, by any chance, tell me what format the numbers are, and/or how many digits? i had a hard time finding them last summer :)<br /><br />I was told that the guy who originaly bought the motor imported it from the US him self, there really isn't anything like it around here.. So any hint of where to get more info on anything relating to it is appretiated!<br /><br />Thank again!
 
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Spidybot

Lieutenant Commander
Joined
Apr 4, 2002
Messages
1,734
Re: Johnson 300GT VRO

One genuine specialist in your area is Brøndby Motor (ol' fella). He was the master behind the Brømo Racer. If anything is worth knowing about Johnson, he's the one. Hope he is still in business - he was introducing his son last time I spoke to him, 2-3 years ago.<br /><br />One place you wouldn't want to take your problems is Nautic Boats, Mosede. Kind of people that will remove a prop with a sledge hammer. Otherwise try Holbæk Bådcenter, they've improved over the last years. Or Tempo Både, Hundige (watch your wallet).<br /><br />Among others, Holbæk and Tempo originally sold Fletchers.<br /><br />Just a few ideas...
 
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enn

Petty Officer 3rd Class
Joined
Jun 26, 2001
Messages
95
Re: Johnson 300GT VRO

Brøndbyøster Motor Service is out of business - the son and father closed their buisness (after 30 + years) last fall.<br /><br />They where wery disapointed by being let down By OMC - many of their old customers where wery bad treated by Johnson/Evinrude - no waranty etc. (seems like OMC/Bombadier totaly forgot the overseas customers) so Johnson/Evinrude is going to have a wery hard time selling anything in Denmark in the future.
 
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enn

Petty Officer 3rd Class
Joined
Jun 26, 2001
Messages
95
Re: Johnson 300GT VRO

Martin - where do you live in Denmark - would for shure like to hear one of those V8 Johnson run one day - have seen a couple in Clearwater FLA and one more in Denmark - but newer heard any of them run.
 
H

Hystik DK

Cadet
Joined
May 3, 2002
Messages
6
Re: Johnson 300GT VRO

enn, You are more than welcome to come by and hear it :) or i could record it and post an mp3 ;-) it sounds awsome:)<br />I live in Hørsholm North of Copenhagen. But i probably won't have it out and running for another 3 weeks.. Since i'm busy with school. Quite bad with the nice weather we are having ;-) My mail is rage@sporty.dk.<br />Where are you from? and where did you se another like this one in Denmark? i would love to pick your brain for some info :) So please let me know if you want to come hear it! :)
 
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enn

Petty Officer 3rd Class
Joined
Jun 26, 2001
Messages
95
Re: Johnson 300GT VRO

I live near Ballerup - so there is only 20 km betwean us.<br /><br />I saw one in Ballerup - it was imported from Greenland and had some problems (carburators clogged and a bad lower unit) - but newer heard it run (was to big to put into the test tank).<br /><br />I know that that one runs somewhere in copenhagen - the owner had a engineering company called "trillingerne" - his boat had a lot of stress cracks in the transom that i discussed with him (the boat was rated for 175 hp max).<br /><br />I also know that there was 2 blocks used on the V8 (different cub inc.) there was also a 275 hp model based on the same engine.<br /><br />Will mail you directly.
 
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