If you were overhauling an Evinrude............

[petryshyn]

If you were overhauling a 1986 90hp v-4 should one inpect the reeds? Would you install Boyessen Reeds right off the bat? Or should you just leave the originals in if you're not concerned about added power? Any advice would be great!!<br />

 

[hondon]

Re: If you were overhauling an Evinrude............

You should certainly inspect your reeds carefully ,as well as everything else in a rebuild situation. I' m not so sure that fiber reeds would benefit you much with this crossflow engine.Stock reeds in my exp. have worked just fine however it might be interesting to see what other comments come around.

 

[Dunk]

Re: If you were overhauling an Evinrude............

hondon, is right. Boysens won't do you bit of good untill you are running 6500rpms or better. Next is their life is 200hrs.. If the stock reeds are flat, clean and not chipped use them. Just make sure if you pull them you use locktite on the screws to reinstall them. High vibration area and you don't want them coming loose.

 

[ROGER67]

Re: If you were overhauling an Evinrude............

YES I HAVE A 1977 ,,175 HP EVINRUDE I HAVE A PROMBLEM WITH THIS ENG RUNNINIG RUNS FINE ON LAND BUT WHEN YOU PUT IN THE WATER WON'T TAKE THE GAS HAVE REBILUT CARBS AND THAT DIDN'T DO IT CHECKED PULGS PUT NEW IN THAT DIDN'T EITHER DOES ANYONE HAVE AN IDEAL WHAT WRONG MAYBE POWERPACK WEAK WHO CAN HELP ME OUT HERE

 

[12Footer]

Re: If you were overhauling an Evinrude............

ROGER67, You might have a plugged exaust port. The only difference between running in the water and on the muffs, is the back-pressure on the exaust system. Sometime a can of decarb cleaner will do the trick.But sometimes not,and the gunk must phyicly be removed.

 

[Dhadley]

Re: If you were overhauling an Evinrude............

I agree. Boyesens are great once you get the RPM's up. The crossflow steel reeds start to flutter somewhere around 6200 to 6400. If you install them make sure your motor does not "spit" at idle. When the motor "spits" fire comes back into the intake/reed area and will burn the reed tip in a flash (sorry -- couldn't resist).<br /><br />The Loctite tip is a good one. Another thing I have always done is surfaced the reed box. I have had great luck with Boyesen reeds and have had several sets in various motors that lasted a very long time. <br /><br />Bottom line -- what kind of RPM are you looking for? Over 6000? absolutely. Under 6000? A toss up. 5500 or less? Nope.<br /><br />Good luck!

 

[Dhadley]

Re: If you were overhauling an Evinrude............

Hey ROGER67 -- didn't mean to not answer your question but maybe you could repost as another question so it's easier to follow. Start with the basics -- what's the compression? What plugs? What heads? What fuel?<br /><br />Good luck!

 

[petryshyn]

Re: If you were overhauling an Evinrude............

Thanx guys...she's staying OEM!

 

[Dhadley]

Re: If you were overhauling an Evinrude............

Schematic -- just for thr sake of being nosey -- what kind of RPM are you going for? And why did you have to rebuild this anyway?<br /><br />Feel free to tell me not to worry about it. LOL!<br /><br />Good luck!

 

[petryshyn]

Re: If you were overhauling an Evinrude............

I bought her in pieces. Gear box was pulled off. Splines were missing off the driveshaft, but I still gambled on the crank being salvageable. Pulled the powerhead off. Cleaned out the crank splines and had a look.(started crying...LoL) Pulled her apart and machined the worn splines out of the crank. Found a 6-point deep socket and machined a .002 interferance fit. Now in the process of machine a hex on the original driveshaft splines. I can't find a used dividing head...so I guess I'll borrow one. Glad I took her apart for other reasons as well. One thermostat stuck open, two piston severely carboned up(rings badly seized)Cylinder just starting to score. Funny thing is, the compression test I did before pulling her down gave me no indication of this.....130 across. <br />I'm not looking for high Rpm, I'm looking for longevity. 5500 is 'loud' enough for me on a 15 foot boat. I was just concerned about my reeds getting tired.<br />I like keeping things original, but in this case she'd be a write-off. <br />I'd never say 'don't worry about it'...LOL Especially to a gentleman like you....Thanx for the interest!

 

[Dhadley]

Re: If you were overhauling an Evinrude............

The carboned up and stuck rings you described is common in crossflows that are "overpropped". We did a test a few years ago on this. We set up a V4 crossflow to turn only 4900 to 5000 RPM. It stuck the rings in 19 1/2 hours. We rebuilt the motor and set it up to turn 6000. After 500 hours we took it apart again. No stuck rings or carbon past the top edge of the pistons. In both tests we used 87 octane fuel, good (OMC) oil, no Carbon Guard and did not use Engine Tuner.<br /><br />When the motor runs "free" at the top it'll run "free" through the whole RPM range.<br /><br />Good luck and let us know how you make out!

 

[ROGER67]

Re: If you were overhauling an Evinrude............

Hey 12Footer I did take the lower unit off and checked the ports was okay there we had it out the other day we were doing 30 nts. just fine then we went to 35nts when it took the fuel replaced all plugs and gas lines even put a back up fuel pump on still won't get up and go like she should tried chokeing it it finally took off then it will run let it set and does the same dum thing at times I think its not getting fuel then acts like it could be the power packs one weak or coils aren't working and at times too I'd like to drop to the bottom

 

[ROGER67]

Re: If you were overhauling an Evinrude............

Hey Dhadley ,,,,thats okay I'm at my witts end here with the thing the compression is 120 very good.. The plugs are new ones I put in ever one telling something different and I go get it put on then its the same old same old you wanted more details I ansewred 12Footer check it out then let me know something thanks