1990 Evinrude v6 looper help

[Bgilman]

I've been working on this motor for a while. Picked up the boat and motor for a good price. Motor sat for 10 years. The old guy I bought it from said it was a great motor.
he said it runs or ran great.
I rebuilt carbs cleaned them although they were spotless blew out every hole, new gaskets, floats float needles and seats. New fuel lines from tank to motor,nrebuilt fuel pump disconnected VRO mixing 50:1.boat runs great at full throttle or seems to. Has problem going slow puffs puff puffs and runs like its out of time. But timing was never messed with. I did replace the broken tack dwell knob. Not sure where to set it. But tried all positions while on the water in gear did not seem to change.
I can run it at wot 5800 RPMs 66 mph on a 20 Stratos bass boat.
Only prob I am having is at low speeds. It start easy cold and easy warmed up. 1 small click it starts.
I'm at the point were I could run it all day like this but I know it's not perfect so I am reluctant.
I am mechanically inclined but new to working on outboards.
i have the money to get the motor running tops just not sure what I need to check.
I know the reach is working off and on sometimes works and sometimes not. Funny is it runs crappy at low speeds but tach always seems to work at low speeds and then at higher speeds woks sporadic.
I'm thinking maybe rectifier, power Pak, statormreed valves?mMotor also reads 92 Even comp on all cylinders.
So any recommendations on this issue. Looking to hear from someone who knows looper motors. It's a 1990 Evinrude XP why is it running lousy at low speeds then at higher speeds seems to run good or does motor just eve out at higher RPMs
I don't want to keep running it if it's not running perfect. It's close to running perfect but I know it needs a bit more help.
What next?
Thanks bgilman

[racer]

If it runs good at speed I would say your sync/link is off. Make sure all the butterflies are shut and roller lined up with line on cam but not touching, idle speed is set with the screw that moves the slow speed timing not the high speed. The manual does a good job explaining this. Also since the boat floats a little low (former Stratos dealer) you need to have the motor trimmed parallel. Are you sure you got the air bleeds back in the correct spot when you did the carbs.

An erratic tach is generally the tach. The tach circuit goes from the stator (alt. side) to the regulator then the tach.

If the boat was originally sold in Ca. I may have been the selling dealer.

[Bgilman]

So are you still in Ca. Racer?
yes I am positive about the air bleeds going back in the right spots. I took a picture before removing them.
Like I said in another post the previous owner had said something about someone doing some carb work on these carbs, specifically with the jets. Would someone ever drill the jets to make bigger? I just want to rule this out.
i did run the motor at full speed wot shut it off pulled all plugs all plugs were burning real good.
They are brand new plugs but are NGK not champion
I'll have to go back and look at the jet sizes to my knowledge they are 68 64 but I may be mistaken.
is their a way to check the hole size other than looking at stamped number? Say a certain size drill bit or just want to rule out that someone did not drill the jets out

[racer]

No after 47 years I retired and moved to Florida.

It is possible the jets are drilled not a good practice. The air jets are actual size, so if it says 50 on the jet it should be .050 That engine runs better IMO with champion ql77jc4.

You can also go to evinrude.com in the parts section to look up your model number and what original jets were. If they are not right I have most sizes.

Went and looked up jets. Early 1990 200xp 35 idle and 39 mid, late production 1990 36 idle and 46 mid. this is mid bore original carb. Since you think you have big bore which I doubt they would need .014 or plugs in the mid and about .020 to .030 in the idle.

[Bgilman]

Ok so let me ask this Racer with out taking the heads off how can I tell if the heads are 200 heads and as far as the carbs go they are 1.45" so would that be big bore?
I just looked at the jets they are 32 34
not sure why I was thinking 60s
do the 32 34 seem correct

[racer]

1990 will have the same heads on a 200 as a 225, they have a casting number on them between the plugs.

Carbs have a number cast into the plastic on the port side.

See above on the jets and understand these are air jets so a smaller jet will richen the circuit.

[Sparkieboat]

Just asking this, did you do a link and sync?

[Bgilman]

No I have not done the link and synch Sparkie . I am taking Racers advice
I will have that done on next Friday.
I received the thermostats installed those still runs the same. But both heads get warm not before 1 was running cold and one hot.
Reason I asked about the heads when I go the thermostats they look different than the ones that came off. They are original omc parts but look different the thermoststs that came out. They fit and seem to be working. Maybe they changed over the years
It seems each time I buy parts they are somewhat differerent the than what came out such as the carbs and the gaskets. All the gaskets that came off were light tan including the o rings at throttle body.the gaskets I put back on are all dark red or brick color except throttle Bobby are black.
I am bringing it to the mechanic on Friday. I would like to know what I am bringing them. So I can say this is a 1990 200xp motor with 19?? Heads. If my heads are different than original I would like to let them know.
I appreciate your help Racer I will do get the link and sych done on Friday or sat next week.
i am assuming that this will help

[Bgilman]

would the casting number be on the silver plug looks like a freeze plug?
or is it the other number cast into the metal?
maybe I am confused on the heads.
The head is where spark plugs go into. What I am looking for is the part where the pistons are running up an down in. That part appears to have been off as the bolts that hold it on are paint free or most paint off.
Sorry for my confusion Racer

[phil blomquist]

The casting number is embossed on the head face The part where the spark plugs go ��

[Sparkieboat]

Well Racer is top notch for sure. Just the link and sync is like a 3 minute job on those 60 degree motors and could cause idle problems as that also effects idle timing. which should be 4 to 6 degrees I think. It is something so simple that it could be over looked and should be at least checked to make sure it is correct.

[Bgilman]

After further inspection of my jets I have 32 and 34 why I don't know why because these are not what racer recommended but what is and has been in it.
Just to clarify what jet should go in what hole.
32 in bottom and 34 in top? 34 in bottom and 32 in top