Powerful Bass-boat.
1985 Evinrude 300XP V8 looper
https://www.screamandfly.com/attachm...3&d=1662883649
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Powerful Bass-boat.
1985 Evinrude 300XP V8 looper
https://www.screamandfly.com/attachm...3&d=1662883649
Quote:
Originally Posted by Lake X Kid
Correct..never a over heating problem.
Did any OMC engine product ever use surface gap plugs? It sounds like surface gap plug production may be ending?Quote:
Originally Posted by lars strom
Absolutely..lots of OMC models used this one as an example.Quote:
Originally Posted by WaterZebra
Champion L78V but you can use a regular spark plug.
https://www.screamandfly.com/attachm...8&d=1662921002
This is by far the most common Champion Spark Plug for OMC models.
L77JC4
https://www.screamandfly.com/attachm...3&d=1662922508
[QUOTE=lars strom;3359843]Absolutely..lots of OMC models used this one as an example.
Champion L78V but you can use a regular spark plug.
[/QUOhttps://www.screamandfly.com/attachm...8&d=1662921002]The rotary snow mobile and race engine used a surface gap plug exclusively. It was made 12mm to prevent the conventional J gap plug from being used as it would have destroyed the engine.
Quote:
Originally Posted by Rotary John
WOW..I did not know that.
Thanks Rotary John.
1985 and earlier crossflow V6 where required to use UL77V plugs. I have seen the top of the piston melted away with the use of gap plugs on 235 - 200 HP motors.
Even though I was a Johnson dealer back in the day I never had a clear understanding of the V-8 motor since we did not sell any at that time. I would like to know the difference if someone can explain to me between the 250 The 275 and the 300 and 300 GT. Just wondering as I only sold the Four cylinders and early six cylinders in crossflowQuote:
Originally Posted by keith scotton
I think the only liter sizes were 3.6 and 4.0. Most the time they just varied the carb size (like on other engines), The 300 had the biggest carbs (plastic venturi body and throttle plates are bigger). I just picked up a 3.6/300 and it had the big carbs. Sold the carbs on ebay for $700. I don't mess with the carbs or OMC electronics anymore, EFI is the way to go. Not sure what the diff was between the 300 and the 300 GT.
-BL
Johnson Stinger 75HP
OMC advertising.
Great engine.
https://www.screamandfly.com/attachm...1&d=1663054370
I always thought the "disappearing pixel" graphics on the Stinger should have been used on the F1 V8 engine cowls.
Was told best spark plug for carbureted F1 V8 was a Champion LG 505
Also the same spark plug we used in the Quincy Loopers in the late 60's early 70's. Platinum wire core.Quote:
Originally Posted by keith scotton
Another very cool..really fast powerful Bass-boat.Quote:
Originally Posted by lars strom
This Champion is also powered by a 1985 Evinrude V8 XP 300HP.
https://www.screamandfly.com/attachm...0&d=1663293065