1989 Evenrude V-6 Looper 225 hp-pair

[2even]

My problem is as follow, these motors were sitting over 5 years. I have replaced fuel pumps and all hoses including the primer balls. I have also rebuilt the carbs (6 per motor),ajusted the throtle plates and timing, changed plugs and wires. I have also cleaned all electrical connections and checked for good connections. I have also checked the flywheel magnets for condition and fixture.<br />My problem is the port motor will not pass 1500 rpm and the starboard will not go past 2800-3000 rpm. In addition to the above both motors have new water pumps and thermostats, I have temp. guages and a working warning system. Both motors do not overheat and pump water just fine. Both motors start easy and idle at about 900-1000 out of the water. Can any one give me some advise before taking it to a mechanic.

 

[R.Johnson]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

With twin engine's, did you drain, or clean the gas tank. Did you do a compression test? Are their any inline filters, anti-siphon valves? Are the remote control cable's in proper adjustment. We could go on and on here.

 

[DHPMARINE]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

Could even be critters made a nest (mess) in the exhaust housing over the years.Yep could be lots of things.<br />But as always,start with spark,compression,and a fuel sample.<br /><br />DHP

 

[Dhadley]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

You say the one motor will not go past 1500 and the other past 3000. You say they start easily and idle about 900-1000 out of the water. <br /><br />Are you trying to get the motors to rev up in the water, under a load? Or out of the water with the warm up lever?

 

[Walker]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

Could be all the things already mentioned also look to see if the timer plate is moving with the throttle arm all the way to the stop.

 

[Joe Reeves]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

Sitting for that length of time, a common mistake is to count on the carburetor soaking solution to thoroughly clean the brass fixed high speed jets which are located in the bottom center portion of the float chambers.<br /><br />If the compression and spark are okay, I'd strongly suspect that those high speed jets are still restricted. If you haven't already done so, remove and clean "all" of the high speed jets with a solid steel piece of mechanic's wire.

 

[Solittle]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

2even - Do you still have backfire symptoms??

 

[2even]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

To answer all of the above:<br />1)Gas tank was cleaned completely.<br />2)new inline filters along with all hardware and hoses replaced.<br />3)compression was even from one bank to other on each motor.<br />4)on the carbs rebuild the high speed jets were cleaned and checked for function.<br />5) Noanti-siphon valves installed.<br />6) cables and controlls ajusted correctly.<br />7) timer base is moving correctly.<br />8) The max rpm given above was as tested on the boat in the water.<br />9) with the carb cover off I am seeing some backfiring through the carbs on the port motor (1500 max).<br />Any advise you can give is well received, thank you.

 

[Dhadley]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

Be careful running those motors under a load with the airbox cover off. You'll lean it out and burn a piston in a heartbeat.

 

[2even]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

Dhadley thanks for the advise, I will button them up and see how they run. Any advise on how to time the motors without using a test wheel ?. I have been told that I might have a reed problem ?.<br />As usual thanks for any and all help.

 

[Dhadley]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

Have you been trying to run them without the airbox cover?<br /><br />Also, if you didn't soak the throttle bodies, now is the time.

 

[2even]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

When I ran the boat in the ocean for the above results the airbox was in place on both, the carbs were completely disassembled and cleaned. Every jet and passageway was cleaned and tested for a clear passage.

 

[Solittle]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

2even - Check here for method to do the initial check of the timing without a test wheel:<br /><br /> http://forums.iboats.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=28;t=000136#000000 <br /><br />Also do a search (red search at the top of the page) using set timing (or simular) as a search arguement.

 

[Dhadley]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

When you cleaned and soaked the carb bodies, did you soak the throttle bodies too?

 

[2even]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

I'm not sure what you are refering to as the throttle bodies, as on my motors the carbs are individual and there is one throttle plate for all the carbs. If this is what you are talking about the answer is no, however it was cleaned with spray carb cleaner.

 

[Dhadley]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

You'll need to pull the carbs back off and then pull the throttle bodies. Soak them, there are passages in there too. You have 6 carb bodies, all have a single venturi. You have 4 throttle bodies, 2 dual throat and two single throat.

 

[2even]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

Thanks for the help, I guess I have more work ahead of me.

 

[Ranger01]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

Dhadley is right one about the saoking and and clearing the passages. I had a clogged passage in my carb on my 67 evinride that drove me nutz. i cleaned and cleaned but never poked out those tiny holes. i finally did it with a piece of wire and it took off like a bat out of.. well you know. Good luck and really be pickey when cleaning those carbs.

 

[2even]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

Well guys I did not get a chance to clean the throtle plates but did ajust the timing as per above link, both motors were in the 30's (btdc) I ajusted as per above to 14 degrees that should give me 18 degrees when under load. In doing the timing spark was strong on all cylinders on both motors. I took the boat out on sunday and this is what was the result: Idle was erratic at first and remained for both at 1000-1100 and 900 lowest in gear. On my way out both motors came up to 3000 rpm with the starboard motor eventualy going to 4500 rpm, this lasted about 10 minutes untill both slowed to about 2200 rpm for the rest of the trip about 20 min. During this loss of power I activated the primer system to see if this would make a difference which it did not, I also had my wife control the boat while I squeezed the fuel balls no change. On my return I decided to disconnect the temp./warning system on the power head (brown wires next to thermostats) and the result was I was able to maintain aprox. 4000 rpm out of both motors al the way back in. I am going to clean the throtle plates this week and re-check the high speed jets and go for another test this week end. As usual all advise is greatly appreciated.

 

[2even]

Re: 1989 Evenrude V-6 Looper 225 hp-pair

Well after re-overhauling the carbs and throttle plates checking every passage with wire now as clean as can be. checked and replaced all fuel hoses on the motor, re-checked all fuel lines and filters and connections. I took the boat for a test yesterday and same situation would no go past 4000 rpm at WOT. I am wondering if now the prop's are the problem.<br />The boat is a 1985 Wellcraft Scarab Sport (30ft), prop's are OMC 14.25 x 21 could it be that I have too much prop ? , Also at the 4000 rpm if I activate the primer system the motors loose power ?. Please help.