Machanics are stumped

[nymack66]

Re: Machanics are stumped

you mean that the carbs on a 84 70 HP and a 85 70 HP motor are different?? big difference between that and putting 225 carbs on a 140...big huge gigantic difference...I still say it is one of his reeds.

When I post to a discussion I am deliberate in not questioning anyone ideas or thoughts, I will however point out reason or reasons why I do not think its his reeds now you mentioned it is not issue here.
He indicated the problem with the engine, based on this if it was the reeds it will never idle correctly or will be clearly spitting gas out the carburettor when idling etc..
I am pretty sure his mechanics would have notice this, since its a nice fat fee for replacing reeds.
The minute you interchange carburettor you better be a professional (which I am clearly not)
Lets wait and see the results if any on the reeds and we go from there..

 

[pulpwood]

Re: Machanics are stumped

The machanic that is working on the motor is very good with motors, but generaly only works on his race boats. He thinks my problem is with the carbs jets, he has a set of bits to size jets, going to start with smaller jets and drill out till he finds the right combo, also trying to find carbs with adjustable jets says he likes those better on stock motors.Let you know what we come up with.

 

[pulpwood]

Re: Machanics are stumped

Ok tried to mess with jets in the carbs. Nothing would work better than what I had, found some carbs for the same size motor but had manual chokes, was not set up perfect but would let the motor thottle up like it should. So looks like I have a bad carb even though looks good. Found some more carbs for electric choke going to order some oem rebuild kits for them will be next week before I can put together hope they are good.Thanks for all of your help.

 

[SparkieBoat]

Re: Machanics are stumped

Sorry NymacK, didnt mean anything by the post. He did say that the motor has run fine before with these carbs on it..So I pretty much figured they would not be the issue, other than some possible damage. Sometimes the reeds will not cause much fuel spatter until near WOT..they are best checked running down the river at WOT. For all the money and time sunk into this motor, I feel compassionate for ole Pulp. I have done the same thing, hate it. Weird how I seem to get all the crazy never seen this before problems...LOL If you figure it out Pulp please let me know what fixed it.
I hope everyone has a great weekend, Especially Nymack, God Bless you bud.
Sparkie

 

[RonnyL]

Re: Machanics are stumped

Check and see if you see any oil around the bottom of you heads laying in the motor pan. You could have a bad head gasket, blowing out one of your heads. (Exhaust) And when you go to get on it, it sucking the exhaust down the carbs. Or one bad, sucking air from a jug. It could be bad, but not real bad yet.

 

[SparkieBoat]

Re: Machanics are stumped

would a bad head gasket show low compression on the cylinder which it is leaking ??

 

[jonesg]

Re: Machanics are stumped

Blown head gasket will have a variety of signs, lean hot running is one.
It will show on the plugs too.
He has a decent mechanic who would notice ...methinks.

 

[mikesea]

Re: Machanics are stumped

was the eng.ever rebuilt,sometimes with the 3 cyl.we found the 42 jet needed to go down ,my 1992 70 hp rebuilt 20 over on all cyl needed the jets down to I think it was 38.I soldered the back and got a small drill index and began trial and error.It wouldnt idle wel at all,would stall upom throttle up.The re jetting fixed it.

 

[pulpwood]

Re: Machanics are stumped

We tried with several different jet sizes, but couldn't get anything to work. So found some carbs that was on another motor and it would work, for what ever reason one of the carbs seems to be bad. We have looked and looked and can't see anything obvious. As for head gasket it was replaced by another machanic, but I do not know why he changed it. like I said before, the compression looks good.