Fresh air to carb issue?

[surfsalterpath]

..... had a mechanic/dealer shake my 1996 FORCE 75hp and ask me if I had any issue with engine seemingly choking out. He suggested engine might have a gasket (exhaust) leak backflowing into cowl and robing airflow necessary for carburetor to function properly. Mechanic also suggested to maybe cut some slots or install air vents in the cowl/hood to bring in FRESH air. He suggested this w/o even seeing or hearing the FORCE run! Just by shaking the engine while hung on my pontoon! You know, I think he was right!

Anyone done this before or heard of similar? After new reed blocks, fuel lines carb clean etc I have this FORCE #purringlikeakitten and on test runs it runs great @ WOT! At dock with the cowl OFF I synced idle to about 1100rpms (950 in gear) but when I put coel ON the rpms drop to about 900 (700 in gear).

Anyone installed an air vent in their FORCE cowls? lol ~

 

[Scott Danforth]

get a new mechanic

 

[surfsalterpath]

...... I did!!!! ME!!!!!

No one wants to work on 2 strokes anymore. My mechanic for the
last 25+ years retired. Guess what that left me! ME and the
1996 FORCE 75hp SERVICE MANUAL! Trying to keep this antique running
one more season w/o spending a fortune! About $1k in new parts so far
this year and about $3k last yr (by mechanic) which inc a lower unit rebuild
among other old 2 stroke issues.

Ordered the Suzuki DF140bg but dealer has NO IDEA
when it will arrive to repower!

I feel REAL good about what I've accomplished. Fine-tuning now to
try and get this FORCE running the BEST it's run in 20+ years!

So far so GOOD!

THANKS!!!

 

[roscoe]

Really doubt this magic mechanic has any special skills. Probably feeding on your description on how it is running. I can't imagine he could hear the rubber exhaust tube moving, that would take some kind of miracle.

Anyway, this issue has already been discussed in your thread of May 30th.

No, the answer is not to hack up the cowling.
It is to replace the exhaust gasket on the spacer plate, and possibly the exhaust tube if it has melted..

1996 FORCE 75hp cowl LOWER SEAL replacement??

Has anyone attempted to replace the "lower seal" on their cowl? part #2 #2 F684989 SEAL-Bottom Cowl Plate (1 required per assembly) F684989 - Seal, NLA [ More info ] $56.25 10+ in stock. Would this seal replacement stop exhaust from infiltrating the cowl housing restricting FRESH...

forums.iboats.com

 

[surfsalterpath]

THANKS!