List of items fixed on my Evinrude 6hp, next?

[SV1000]

Thanks for all the answers to my questions and suggestions today, now I have some answers after looking at the motor and making some changes this evening.

For any new people that read this thread, during my first trip out with this 6904E 6hp, the hose was popping off the fuel tank and full throttle felt like I was moving about 3 mph in a 14' Lowe V-Bottom. When the hose would pop off, I knew because the rpm's increased significantly until I put the hose on and pumped the bulb.

Previous owner had J6C's installed and gapped at .030" and I installed QL77JC4's gapped at .040"

Upper spark plug was dry, lower plug was very wet.

Now, I just realized I had the motor sitting in the garage with back of the motor and skeg on the ground and the control side of the motor up since Saturday. Would this position allow fuel to drain into the lower cylinder?

White spark jumped 5/8" on both cylinders with the test gauge.

Tank fitting replaced with a 90 degree 1/4" npt to 5/16" barb so no leaks now.

Filled my barrel, choked it and pulled twice, switched the choke off and it fired up and idled fine. I raised the rpms almost to full throttle and it created a great white smoke cloud. Smelled like unburned fuel to me.

Could this simply be the fuel mix?

Would to much oil cause it to run rich or lean?

I will mix fresh fuel at 50:1 tomorrow.

Unfortunately, I could not find my compression gauge, I either loaned it to someone or packed it up and forgot where so I will try and rent a gauge tomorrow. I can't find my AC gauges and that makes me think I packed my automotive tools together.

Other than the compression check and new fuel, what other reasons would cause low power?

Oh yeah, I had the motor trimmed at the highest setting (farthest from the transom) but not on purpose; was this the reason the bow was 4' in the air?

 

[ezeke]

Re: List of items fixed on my Evinrude 6hp, next?

When you run in a barrel you can't use the amount of oil you have mixed in the gas so it burns and clogs things up. Too much oil would not do much in the short run, but over time it can contribute to carbon buildup, plug fouling, coking etc. You get the similar results when you troll a lot and never open the motor up.

You can help! use Synthetic TCW-3 oil; it has a higher flashpoint. Use a fuel treatment for the carbon, or buy BRP/Evinrude XD-50 oil which has the carbon treatment built in. You will get less plug fouling and smoke in the bargain. Be sure that you have a good thermostat and that the operating temperature is correct.

Running in a barrel can cause exhaust to circulate into the engine compartment with unpredictable results, none of which are good. Its better to do your fine tuning with the boat tied firmly to a dock and the engine in gear.

You might garner a little iuseful information from the following thread: http://forums.iboats.com/showthread.php?t=235855

BTW, You should not run any engine at much above a fast idle unless it is in gear. The engine can diesel or "runaway" and you will not be able to stop it. Unchecked, it will run until it blows up.

 

[SV1000]

Re: List of items fixed on my Evinrude 6hp, next?

ezeke, I will look for the premium oil today.

I measured my transom this morning before work (benefit of living 10 minutes from the office) and found it to be 15" and the motor mount to the cavitation plate is 17".

Maybe this is the reason along with my trim setting that is slowing this boat down!!!

I read on another thread that I should use different holes to raise the motor height. Does this mean that the clamp assembly is adjustable up and down on my motor?

 

[tashasdaddy]

Re: List of items fixed on my Evinrude 6hp, next?

your clamp assembly is not adjustable. there are not mount bolt holes on a 6hp, just the transom clamps on the front. you may need shim our motor up, or a mini jackplate. you need to get the motor running properly, then worry about the set up. yes, the trim all the way out would push the bow up.

 

[SV1000]

Re: List of items fixed on my Evinrude 6hp, next?

I am not trying to a smartaleck, but if the compression checks out, would that rule out motor problems after finding spark gap to be 5/8"?

 

[ezeke]

Re: List of items fixed on my Evinrude 6hp, next?

There are others on this forum who are much more informed on raising the motor than I am. The main idea though is to decrease the drag that the motor creates by exposing less of it to the water below the keel. You still must base the amount to be raised on the alignment of the anti-ventilation plate with the keel, and the position of the A/V plate in any setup should be no lower than directly in line with the bottom of the boat. After that, it depends on setback, prop, and the boat.

The clamp type transom bracket assembly is not adjustable, but there are a number of ways to raise the motor. You need to get a solid mount to clamp the motor to, and that requires a few extra parts.

You could simply add wood, but it is not very strong. Using aluminum angle bars and stainless bolts can provide the support for a variety of brackets.
http://www.iboats.com/Transom_Eleva...04729172--**********.623765245--view_id.40157

 

[F_R]

Re: List of items fixed on my Evinrude 6hp, next?

Trim certainly could be a factor. I doubt very seriously that raising the motor will make any difference that you can notice at all. But if you want to try it, just put a piece of 3/4" thick wood on top of the transom and set the motor on top of that. Make dang sure the clampscrew pads aren't going to skid off the top of the transom and lose the motor!!

You can't get the bow down because you don't have enough power to plane it off. Factors affecting this are: The motor just isn't big enough; Improper trim; Motor not developing it's rated horsepower; BOAT LOADING--put some weight up front, sit in the middle seat, excess weight in the boat (water); crud on the bottom of the boat (common is salt water);----and others.

6hp isn't going to plane many/most boats. If it does, it is borderline. But once you get it up on top, if you can, it will move along pretty nicely.

 

[SV1000]

Re: List of items fixed on my Evinrude 6hp, next?

I checked the compression at lunch; four pulls each test, four tests for each cylinder and they are both 77 psi. It sounds like it's worn out and needs rings but I am happy it's not 77 and 115.

 

[ezeke]

Re: List of items fixed on my Evinrude 6hp, next?

If you search, you might be able to find a OEM propeller # 386587 that was used with your motor. It is a 3 blade 5 pitch prop that would get close to maximum thrust that you should expect.

Check

sea-way. Com
laingsoutboards. Com
tcoutboard. Com
fairwindsmarina. com
​

​

 

[jbjennings]

Re: List of items fixed on my Evinrude 6hp, next?

SV1000,
77lbs. of compression on a 6hp is not that bad at all. If they're both the same, even better. Is your aluminum 14 foot boat light or does it have floorboards, batteries, or other such heavy stuff in it. If not and it's just a basic aluminum boat and just 1 person 200lbs. or less, I think it should plane it. It should go about 12-15mph I would think. If not, I think something's wrong with it. Are you absolutely certain it's not hitting on only one cylinder? Have you tried a tiller extension to get you closer to the middle of the boat? Those things aren't very powerful, but I had one that would plane me and a friend on a 14 foot duracraft johnboat. But that was when I weighed about 135 and my friend about 160. We also had a 14foot johnboat that was very light and a 4hp evinrude planed us and we went all over the place in it. We were about 250lbs total then, though. You said one plug was very wet---almost certainly no or weak spark on one plug. I know you also stated you checked spark, but there has to be a reason one is dry and one is wet. Leaning it over and stuff I don't think would cause that after it ran a minute or two. Of course, if F-R didn't suspect this, I certainly am probably wrong!
Just a thought,
JBJ

 

[SV1000]

Re: List of items fixed on my Evinrude 6hp, next?

jb,

I am not *sure* about anything LOL.

My boat is about 140 lbs plus the motor, a battery, trolling motor, ice chest with one bag of ice, 5 gallons of fuel and maybe 25 lbs of assorted gear and me, 250 lbs.

I returned the rental gauge after work and the replacement gauge is brand new; I rechecked the compression and hit 80 psi cold on both cylinders.

I mixed a new batch of fuel and added the Sea-Foam and then decarbed using a spray bottle. I checked again and it was 70 psi warm on both cylinders and then I decarbed once again. I did not check the compression again.

I did check the Wizard 9.2 in the garage and it hit 80 psi on both cylinders cold. I guess this is coincedence.

The Evinrude idles down well, if I were to guess I would say 500 rpm. It sounds fine and starts on the first pull after choke almost every time. I will know more a week from Saturday when I go back to the lake. I will check the speed by GPS with the motor trimmed all the way out like I had it and then in where it should be. I am going to set it up to the best of my ability on the trailer and mark the position with a Sharpie to make it easy to reset.

 

[jbjennings]

Re: List of items fixed on my Evinrude 6hp, next?

I wouldn't worry about the compression. It does sound like you're in need of a 10 or 15 hp, though. Those little 6's don't like the weight. the 7.5's don't either! have you tried putting the battery toward the front to try to balance out the weight? If so and it still doesn't plane out, you're probably out of luck. Just too much weight for the 6.
Good luck,
JBJ

 

[SV1000]

Re: List of items fixed on my Evinrude 6hp, next?

I will have the kids with me on the next trip, so that will add about 105 and 115 to the front and middle seats so I am going to leave it like it is now with the battery and fuel in the back. I will at some point move the battery to the front and possibly the trolling motor once I build a bow mount for my transom mount MK.

I have time to work on the Wizard 9.2 and if I get it running I take it with me for testing.

Like I said in an earlier post, my grandfather took me to Amistad every summer and we started out with a Lonestar 14' with a 10 hp Johnson. It was OK but became fun once he installed a 15 hp Johnson. Thanks for the help.