1984 Evinrude 6hp vs 1983 Johnson 7.5hp Outboard Motor GPS comparison

[@GlenB1963]

They are both lovely little motors. The sound and smell of a 2 stroke outboard says to me Freedom. Best wishes ❤️

[@oldjohnnyrude8404]

@@GlenB1963 Thank you. I agree! They're both great little motors. Love the smell of a 2-stroke also. Thanks for watching!

[@JBOutboards]

Nice motors Ben. You had em rockin pretty good.

[@oldjohnnyrude8404]

Thank you! These little motors do very nicely for their size. They're fun to run around with sometimes. Beautiful little fishing motors. Thanks for watching!

[@mattioder]

Great motor I had two. A 1981 and 1984.

[@oldjohnnyrude8404]

@@mattioder They sure are great little motors. I really like these two. Thanks for watching!

[@marksmith9295]

Always good to see you running the fruits of your labor. I hope you have a cart to drag your motors back and forth. My back aches just thinking of putting them on and taking tgem off the transoms.

[@oldjohnnyrude8404]

@@marksmith9295 Thank you! I do have a cart to get them close. Still have to walk them into and out of the water to mount and dismount them. Today I was using the rack on the back of my golf cart. Lucky enough to have the lake access mostly to myself today. It sure got windy though. The small motors aren't too bad to take on and off. If I'm swapping out the 22c.i. or larger motors, thise get tiring. Thanks for watching!

[@marksmith9295]

A golf cart sounds like a great idea! Just need a little cherry picker for it:)

[@oldjohnnyrude8404]

@@marksmith9295 I use the golf cart or the SxS at the cabin lake access quite a bit. At the lake at home it's nit an option, so I usually bring a motor cart to get them from the truck to the shore where the boat is. Having a small lift on the golf cart would be pretty slick!

[@jpotts8814]

Great video. Love that boat.

[@oldjohnnyrude8404]

@@jpotts8814 Thank you! I'm very fond of the boat too. I like it so well I have two of them. Thanks for watching!

[@donk499]

A very interesting comparison for sure, one I have wondered about as well. My guess is that a few things came into play here, one of which was the change in HP rating methods that came about in 1985. The other thing to consider was that the 8hp really was much more than a larger venturi carb. Originally, the 8hp had a larger intake manifold as well, then the exhaust ports would be changed in future years as well. So, I am guessing that the newer 6hps were just "rerated" 7.5hps. Some of those later 8hps will just about keep up with 9.9s, great engines in spite of their engineering flaws.

[@oldjohnnyrude8404]

@@donk499 Your thoughts on this align about as perfectly as I could imagine with mine. It's good to hear someone, especially with your experience with OMC motors. substantiate my thoughts here. The 7.5 does have a slightly more crisp, less muffled exhaust note than the 6hp. I'm guessing the 6s were re-rated 7.5s maybe with some minor internal change to make them a little quieter than the 7.5hp predecessor. In any case, I'm still looking for an 8hp amd I still really enjoy these two little motors. Thanks for your thoughts and thanks for watching!

[@donk499]

@@oldjohnnyrude8404 Yeah, I heard the slight difference as well. The inner exhaust tubes changed slightly around those years as well, wondering if that might explain the difference we hear. I really like these engines, and the 8hp versions developed amazing power and speed. I always liked the original versions of these engines like the ones shown in your video. Never cared for the later model ones with all the cheesy plastic covers and funky forward mounted tiller/shift handle, along with the crappy carb/sync process. But, these later models would introduce one final important improvement to these powerheads which was the steel/cast rods that replaced the flimsy aluminum rods used in the original models. The aluminum rods were fine for the older/original style 6hps, they did not wind up the way the newer models do. Oftentimes, you will hear a bit of a "ringing noise" on the older style powerheads which I attribute to the aluminum rods stretching out a bit. I have often wondered if the original aluminum rods can be replaced with the newer steel/cast rods, an experiment for another day I guess. Don

[@ct1762]

@@donk499 interesting what you are saying here. I am a 20 year OMC re-builder and have extensive tinkering and rebuild experience with these. my findings are as follows: the 6hp was prop rated, the 7.5 was of course powerhead BUT the exhaust on the 7.5 is the same as on the early (1984-1985) 8hp motors (2 piece). thats the only difference i could find. now, as you say, the 8hp is a COMPLETELY different animal! that one was reeds, carb, cylinder head and exhaust (there are some exceptions). around 1988 both the 6hp and 8hp got improved running and idle characteristics with the 2 big exhaust ports, although ive seen some earlier ones with those as well so not sure exactly when that changed. i could be forgetting and the porting change was different on the 8hp only until 88' where the 6hp got it as well to save money on machining and keep up with the pesky Japanese motors:). i did an experiment with an 8hp and put a 15hp carb on it, shaved the head (only around .010'') and squared and mildly chamfered the exhaust ports. thing was sort of soft on the bottom end, but spun a stock 8'' prop to 7000+ on double oil . that was a gain of over 800 rpm!

[@tinybubbles3724]

I had a early 80's 4hp and a 7.5hp. The 4hp converted gas to noise and the 7.5 although still painfully slow was half as loud.

[@oldjohnnyrude8404]

@@tinybubbles3724 I found the early 80s 4hp to be a pretty good power to weight ratio. Not really fast, but decent power for such a light motor. I'm quite pleased with the performance of this 7.5hp is a lot faster than the 4hp. Neither motor seems excessively loud for a 2-stroke from that era. 🤷‍♂️. Thanks for watching!

[@mikeperry6794]

Basically the same block with different bore?

[@donk499]

The powerheads on the 6 and 7.5hp models were the same. The later 8hp powerheads actually were different. Initially they just had larger intake manifolds, then the exhaust ports would change in a few years as well. The cylinder bores were the same on all of them though

[@oldjohnnyrude8404]

DonK nailed it. 👌 Thanks for watching!

[@georgekeats1478]

It seemed like there was more wind on the second run. The boat seemed to get kicked around a bit more. Good comparison.

[@oldjohnnyrude8404]

@@georgekeats1478 The wind did pick up a bit from.the first to second run, bit it wasn't much stronger. It was only 5 or 6 minutes after the first, but the wind continued to pick up for the next hour and a half. There was a little more crossing boat traffic on the second run as well. Either way, the 7.5hp edged out the 6 slightly. It feels a little more torquey during acceleration too, but there not much different. Thank you and thanks for watching!

[@wyomingadventures4943]

I thought there would be a little bigger spread too. Just got my 7.5 and am really liking it. Cant go weong with either choice though.

[@oldjohnnyrude8404]

@@wyomingadventures4943 I wasn't sure what to expect, but I knew they were pretty close in performance. In 1983, there was a 4.5 hp and a 7.5hp. These had the same block. In 1984 they were 6hp and 8hp also sharing the same block. The 8hp had some performance upgrades over both the 7.5hp and 6hp. I still need to get a hold of one of those. I have the 4.5hp also. The performance difference between the 4.5 and the 7.5hp is pretty incredible. I think maybe the 6hp was mostly the result of the change in how the HP ratings were done changing from crankshaft to prop shaft rating. Don K's view on this seems to agree with my thoughts and this test seems to substantiate that thought. Thanks for watching!

[@ct1762]

@@oldjohnnyrude8404 the 4.5 is a much smaller block than the 6-8hp motors. i mentioned this above, but the 7.5 had the later 8hp exhaust but all else seems to be prop-rated 1984-up 6hp which perfectly explains your test results. the 8hp 1987-up especially, had different carb, 3 petal reeds, tighter head. made it really scream totally different motor than a 6hp. i have a freshly rebuilt 8hp fully dressed minus carb 88' 8hp powerhead if interested. i can swap a powerhead on these in 25 minutes:)

[@timothyhite4546]

How much does the 6 hp motor weigh compared to the 7 1/2

[@oldjohnnyrude8404]

@@timothyhite4546 Both motors weigh the same. The same powerhead and exhaust leg on both motors. I'm not exactly sure what internal differences there are between the two. In 1983, there was a 4.5 hp and a 7.5hp. These had the same block also. In 1984 they were 6hp and 8hp also sharing the same block. Thanks for watching!

[@outboardfixer]

I had a 6 just like that and a 70ish 4 hp, I was shocked at the difference. The little 4's were not even close.

[@oldjohnnyrude8404]

@@outboardfixer Even the first generation of the 6hp doesn't hold a candle to these 6s from a performance standpoint. The 7ps 4hps are great little motors, but they're not much in the speed department. You're right, not even close. Thanks for watching!

[@johnbringold3305]

I have a 1974 six hp and on a 12ft boat with nothing in it I am lucky to get 7 miles per hour out of it is there a different prop besides tge 2 blade I can use

[@oldjohnnyrude8404]

In 1974, the OMC 6hps were still using the first generation powerhead, which was basically an updated version of the 5.5hp powerhead from 1954. The second generation powerhead from 1980 that replaced the 6hp was introduced as a 7.5hp and is a fully jeweled powerhead. There are other props available for the first generation 6hps. There really isn't much to gain with a prop change on a gen 1 6hp. Probably more speed to be had with your setup by playing around with weight, balance, and trim angle. A 12 foot boat can be considerably more difficult to plane than a longer boat because of balance. A first generation 6hp will push my 14 foot boat at around 10-11 mph with proper balance to plane the hull. The same motor on a 12 footer for me is closer to 7 also because it won't plane off. I hope this helps. Thanks for watching!

[@johnbringold3305]

@oldjohnnyrude8404 thanks for the info

[@labradorguy5311]

Interesting! Those two motors are looped charging and all ball bearings? They are much faster than the fifty's motors. Not quite as cool but that is in the mind of the watcher! It looked like a great day to be on the water! Thanks

[@oldjohnnyrude8404]

These two motors have fully jeweled powerheads, but are cross flow, not loop charged. Yes, they're definitely in another league of performance from the earlier generation 6hp OMCs. They certainly have a different style than the 50s motors. 50s styling is hard to compete with in my eye as well, but these are excellent performers. I like the styling of these motors too, although they're definitely more modern amd "plastic" than the 50s motors. It was a great day to be on the water, although it.did get very windy right after this video and for most of the day. Thanks for watching, Dale!

[@Mason-j2i7i]

I have a 1979 Johnson 9.9 I need a carburetor where do I get one?

[@oldjohnnyrude8404]

OMC part # 0389914 is the '79 OMC 9.9 carburetor assembly. I would recommend checking on Ebay. NOS carburetors will be very difficult to find and likely very expensive. Good used ones are available that may or may not require a rebuild woth a new OEM kit to bring them back to proper operational condition. I hope this helps. Thanks for watching!

[@Mason-j2i7i]

The 9.9 Johnson it is stuck in forward how do I get it to go in neutral and reverse?

[@oldjohnnyrude8404]

@@Mason-j2i7i The throttle needs to be near idle position to allow the gearshift to move. The propeller needs to be moving to allow consistent smooth shifts, so if the engine is not running, you may need to turn the prop by had some to get the gears to drop in from neutral also.

[@jimmyandersson4599]

Greetings from Sweden🇸🇪👋. I was amazed by the no-difference between them. I love your videos. The lake and surrounding nature is amazing. So I have a little, perhaps a silly question, your boats in America is very different compared to ours, we don't have space for 2 engines beside each other on such a small boat, but since you have, what happens if you place two 6hp engines beside each other and run them together, how much faster would it go compared with only one. And would a 9.9hp go faster or slower two 6hp. I know, it's small engines and you Americans always put dubble 150hp on a but thats only build for one 70hp😂😂😂 but this would really be fun to see, because small engines comparisons is much easier to see the difference when the wind isn't a factor. Have a great day and thanks for your videos.😊👍💙💛🇸🇪

[@oldjohnnyrude8404]

@@jimmyandersson4599 I thought there might be a little more difference on performance between these two motors as well. After running the '83 Johnson 7.5 the first time, though, it seemed to be fairly similar to the '84 Evinrude 6. I wanted to do a direct comparison to see how close they are. The 7.5 has a little crisper exhaust tone and feels a little torquier out of the hole. The top end is very similar. Around 0.5mph difference. This is a very nice lake with very nice natural surroundings. While there are a lot of houses on the lake, there is still a lot of beautiful natural surroundings. My Alumacrafts are the only boats I own that have deep sides and a short transom that is essentially full width and allows running multiple motors. It would be interesting to run a pair of 6s or even this 6 and 7.5 in tandem on the boat. I'd habe to imagine the performance would be close to a 9.9. ~13.5hp but with the drag of two gearcases would have to be in the same range of performance. I may have to try I sometime. You're right. These days it seems like everything you see videos of is overpowered and every new larger boat has 3-5 300+hp outboards hung on it. I don't understand how people afford that stuff, but they seem to do it somehow. I am planning on putting two '59 Evinrude 35s on my Alumacraft Flying C when it is finished and I'm very strongly considering rigging this FD or my outer one for dual motors and using twin 18, 20, or 25hp motors on it. Seems like it would be fun and I love the sound of the twins running. Thanks for watching!

[@jimmyandersson4599]

@oldjohnnyrude8404 thanks Johnny for your answer👍🇸🇪 I appreciate it really. Yes, a test with two tandem 6hp or thoose two would be fun to see. And yes, the drag was what i was wondering about also, but you have the resorsers for doing the test. I don't😄😄 we don'thave any small boats with place for 2 or more engines😄😄 sometimes swedishboat builders sucks😂. I remember all thoose old engines. My uncle had an old Volvo Penta 2,5hp from the 50-60s, and it was slow but a nice fishing engine. Bringing many fun memories back to watch your videos. 😊👋💙💛🇸🇪🇸🇪🇸🇪

[@oldjohnnyrude8404]

@@jimmyandersson4599 I will definitely keep that tandem run in mind and make that happen. I may try to make a link bar to link the steering together before I do that. If not, I'll lock one straight and steer with the other. I'll see whan I can get that run in. Stay tuned!

[@jimmyandersson4599]

@oldjohnnyrude8404 thanks Johnny, nice of to answer and I will keep on watching, and have a lookout for that test.😊👋🌻 And as always keep yo.... no that's you😂👍 But I'll give you fun fact about sweden: Try to sell a baseball-kit here in Sweden and you will go bankrupt. No one here knows what baseball is🤣🤣 but we have something similar called "burnball", only difference, we don't have a pitcher or a catcher and it's only a fun game among folks and kids and not in a major league and you can buy a full gamekit in your nearest gas-station.😉👍👋💙💛🇸🇪

[@jimmyandersson4599]

Took me a while to figure this out but "Johnnyrude" is not a name, it's slang for an old outboard engine, right? So what is your name? My name is for real Jimmy Andersson from sweden.