merc 245 carb smoky rich bottom end

[eli]

1993 245 carb bottom is pig rich especially when warm 80 degree out
upon start up I have a cloud and when accelerating another cloud , then cleans up mid and top ,stock jetting
carbon reeds ,stock crossdrilled intake ,timing where its suppose to be idle and such
these are old engines are easy to work on but its starting to really bug me ,if I was loaded I have efi on them
I,m just a normal boat rodder looking for some light ,thanks

[outasite]

Check fuel pressure,then take look down the carb throats at idle and see if a needle and seat are leaking.

[1FASTLASER]

+1. Eli has it always been like this or as time goes on it gets worse ? My XR6 used to be like this when the weather got hot. I never complety cleared it up

[eli]

not always sometime when we stop at beach or bar for a bite we start up clean and boat takes off like the devil , last week at 72 degree it hardly smoked yesterday at shootout it was a cloud ,I was running sea foam Friday on cruise to clean carbon so if it sits and I start it what a cloud but Saturday I had no sea foam in it and when I started to do a run I fogged the place but I ran it good earlier in morning to clear engine out will look at carbs again had them apart hundreds of times

[Dave Strong]

not always sometime when we stop at beach or bar for a bite we start up clean and boat takes off like the devil , last week at 72 degree it hardly smoked yesterday at shootout it was a cloud ,I was running sea foam Friday on cruise to clean carbon so if it sits and I start it what a cloud but Saturday I had no sea foam in it and when I started to do a run I fogged the place but I ran it good earlier in morning to clear engine out will look at carbs again had them apart hundreds of times

Might be time for good cleaning with new needle and seats and gaskets.

Dave

[eli]

looking at the unsuspected in the carbs the fuel screw has wear marks on needle so I put them in drill and spun needle in 600 to clean up marks then turn them in 1/4 turn ,fuel pressure 4 psi at carb ,needle and seats gaskets all new last year 20 hours since leak down all good

[Dave Strong]

1/4 turn from seated seems along way in to me. If I remember 1 1/2 turns out from lightly seated is the base setting.
What altitude you run at?

Dave

[eli]

dave I leaned out the off idle jet from 50 to 52
turned fuel screws in to 1 turn out ,and installed new reeds from chris carson
did not have a chance to fire motors yet ,alt is 1300 ft

[Dave Strong]

dave I leaned out the off idle jet from 50 to 52
turned fuel screws in to 1 turn out ,and installed new reeds from chris carson
did not have a chance to fire motors yet ,alt is 1300 ft

Hope it cleans up for you.

Dave

[97 TWISTER]

I had probs with my fuel enricher sticking occasionally on my 245. Just a thought???

[ProComp]

dave I leaned out the off idle jet from 50 to 52
turned fuel screws in to 1 turn out ,and installed new reeds from chris carson
did not have a chance to fire motors yet ,alt is 1300 ft

typically the larger the number, the larger the jet. Did you mean you went from a 52 to a 50?

[eli]

off idle jet 52 is leaner than 50 according to merc racing manual trying to clean up off idle rich I fired motors yesterday and they sounded better have to water test going to check the enricheners see it they are ok

[eli]

went to pelican lake race the engines ran way better ,I figured what I had on the Daytona would work on the twister ,Fuel Pump switches ,I used to shut off pumps to relieve carb pressure 5 or so seconds before I turn key off
and would start up mostly smoke free and clean getaway ,somewhere in the carb they are leaking fuel for few minutes till pressure drops I,m suspecting needles /seats but I changed them in may 2015 so for now pull switches going in hooked to tether shutoff ,looking this winter at wh carbs with split floats

[Dave Strong]

You using Merc or aftermarket parts?

Dave

[eli]

sierra needles and seats ,I purchased a set of mercury kits few weeks ago may put them in .jason