reed valves 1973 / 135 evinrude

[ssispy]

can reed valves cause a back fire if one is week everyone that i have asked in my town said that i had stoped up carbs or bad fuel pump they said lean pop not back fire. one person said it was my stator winding . i have had carbs rebuilt fuel pump new, fuel ball changed, coils 4 of them and stator for a price of about 500.00 so far, can't spend much more wife getting mad. and i can't find the stock reeds anywhere motor # 135383.<br />pops only at an idle and dies get it off an idle runs fine to me

 

[ddbyrd3]

Re: reed valves 1973 / 135 evinrude

When did you have the carbs rebuilt??? If it wasnt recent I would start there... Its extremely easy to do and you can eliminate them from the equation.....

 

[Basscat 1]

Re: reed valves 1973 / 135 evinrude

Reeds can cause the engine to back fire through the carbs. The best way to check the reeds is to pull them out and use a flashlight. If you see any light around the edges, the reeds need to be replace. Check out this web site for replacement reeds. web page

 

[R.Johnson]

Re: reed valves 1973 / 135 evinrude

Testing reed flatness with a flash light to check leakage would be an over-kill. My granite surface plate, with a precision parallel sitting on it, won't pass that test. Two surface's that won't leak light are flat indeed. That engine has a positive pulse that will snap the reed closed, plus they are wet with fuel, and oil to effect a seal.

 

[Basscat 1]

Re: reed valves 1973 / 135 evinrude

There was not light around the edges of my Boyesen Reeds when I re-assembled them, but I also hand sanded my reed blocks with a flat piece of glass, (6 inches thick) and some fine sand paper. But, then again I am a perfectionist. I figure if something is worth doing, its worth doing right.

 

[John Bett]

Re: reed valves 1973 / 135 evinrude

basscat1, did hand sanding make a difference? What grade paper did you use?<br />Thanks

 

[Basscat 1]

Re: reed valves 1973 / 135 evinrude

The boyesen reeds will come with instuctions that tell you to sand the reed blocks. Yes it makes a difference.<br />It seems like I used 420 grit. You want it to be as flat and smooth as possible. It took about 2 hours work, and a six pack.

 

[John Bett]

Re: reed valves 1973 / 135 evinrude

Thanks.