TWO STROKE Question

[mightymite]

Is it normal for some blow-by of the reeds during the compression stroke ? Or is this indicative of cracked/ defective reeds ?
Thanks, John, Member

[chris-p]

Which motor? In general, no.

[mightymite]

The motor is a 3hp Evinrude, 1965 vintage.

[frankr]

Should not be blowing back.

[westwind]

Might be something stuck in them? Needs attention at any rate.

[mightymite]

Something stuck. That is an interesting thought. The reed manifold appears to be mounted on the back of the carb studs. Could I remove the carb and spray some cleaner, while turning over the motor.Is that worth a try ? Or should I remove the studs and pull the reed manifold off ?

[outbdnut2]

You can always try the carb cleaner, but something could heave been sucked in that the car cleaner won’t dissolve. You’ve got nothing to lose by trying carb cleaner, but it’s not very difficult to pull the reed assembly – I don’t remember the specifics of that engine but you may have to pull the gas tank – and that comes off easy too. Another thought on the carb cleaner – if it dislodges foreign material caught inthe reed, that will move through the crankacase and cylinders – probably without problems but there is a slight chance of problems depending on what the material is.
Dave

[mas]

I picked up a very low-hour (by appearance) 1947 Seaking 5hp that wouldn’t run. Started into it by breaking down the carb. The reeds are actually part of the carb on that model. And to my surprise, I found a chunk of hard rubbery material lodging one of the reeds open. That motor would never run right without the reeds properly closing. After removing the debris, the motor runs great!

So yes, it is possible, but I guess probably rare.

Mas

[frankr]

quote mighty mite:

Something stuck. That is an interesting thought. The reed manifold appears to be mounted on the back of the carb studs. Could I remove the carb and spray some cleaner, while turning over the motor.Is that worth a try ? Or should I remove the studs and pull the reed manifold off ?

No need to remove the studs. Just the two nuts that hold the carburetor on and the screw at the side of the silencer, and pull both off together. Then there is a screw at the top of the intake manifold to be removed and you can pull the manifold and reed plate off.

[mightymite]

Thanks, I’ll pull the manifold and take a look.

[Author]

Posts