Joe Problems with 1997 Johnson 175 Faststrike

[J. Clint Cheveallier]

" I have a 1997 Johnson 175 Fa

" I have a 1997 Johnson 175 Faststrike that runs wonderfully. Except that after I've fished at a spot for a while and start my motor, it starts fine, when I start to move up on my anchor it coughs, sneezes and dies over and over again.

I've checked the fuel line from the fill pipe to the engine; replaced all carb bowls. Two different mechanics have tried to eliminate the problem and have failed. My carbs are open 8 turns at present because the mechanic couldn't get it to stop sneezing at all at the typical 5-6 turns.

Someone has suggested "heat soak" as a problem. This has been going on over a year. Can you offer any suggestions?

Thanks,

Clnt "

 

[Tom Lea]

" Just getting ready to post t

" Just getting ready to post the same thing almost. Had a real problem lately with the ball going soft. Mounted it under the splash pan vertically and that really seems to have helped a LOT.

What is the correct setting and procedure for the allen Idle jets? Anyone know?

>Have a 1996 Johnson 175FS on a 96 Stratos 285XL >Pro. Engine stumbles through transition >(1500-1800 RPM's), especially when it's hot. Most >times I can catch it with a bump of the choke >button. This engine does not have a lot of hours >on it and is pretty much babied. Lower speeds, >fine: Higher speeds fine. I have a 'shop manual', >but it doesn't cover carbs with the allen idle >adjusting screws. The intermediate jets (which I >assume to be air jets, not fuel) are stamped '40' >on the end. My brain tells me to get a SMALLER >set of intermediate jets and this will cure the >problem. Can I get your thoughts folks.

>Ran carb cleaner through it.

Thanks

Tom Lea "

 

[joereeves]

"Clint, Tom..... Unfortunately

"Clint, Tom..... Unfortunately I retired before those engines came into being. However the sneezing, spitting back, etc is always caused by a lean setting.... and since the engine does run as it should at times, that tells me that the carb setting are okay (carb setting would not change back and forth), but obviously something is taking place that is making the engine run lean at times. The fuel primer bulb may have a faulty valve which is allowing the fuel to drain back into the tank. I'd suggest that after sitting for awhile (fishing, whatever), pump the primer bulb up hard to see if that has a positive effect.

Usually it is just one carb that is causing the problem though, and to pinpoint exactly which carb it might be, do this. Do whatever has to be done so that the carburetor throats are accessible, then with the engine running with the sneezing, spitting back condition taking place, place two (2) fingers into the carburetor throat. This of course will cause that carb to draw in more fuel, eliminating a lean condition if it exists. Go from carb to carb with this test. When you find the carb(s) that eliminates the problem, it should narrow the gap in what to correct.

Years back (not too many), a similar problem existed with one of the "Crossflow" V/6 engines (not sure of the exact year or hp), and the cure (with OMC's recommendation) was to install a double (2) intake manifold gasket.

Joe

"

 

[Clint Cheveallier]

" Thanks very much Joe. And,

" Thanks very much Joe. And, Tom, I hope you find a solution for your problem. A local OMC certified mechanic ran my boat twice lately and couldn't get the thing to act up. But, when I go fishing, it usually acts up.

Clint "