rough or no idle long time to plane

[rick powell]

have a 200xp evinrude on a ranger 390v. Motor idles rough when it is put into gear, also hard to keep at idle out of gear. Takes forever to plane out until certain rpm then takes off planes out and runs great. Ihave checked compression it's ok, within 8# on all cylinders, checked spark, at least 7/16 spark on all cylinders. I've changed spark plugs to champions gapped at .30, had ngk plugs before. The fuel bulb wouldn't pump tight, replaced. Rebuilt carbs, when rebuilding found 1 carb with same size jets in both idle ports replaced with right jet also in all other carbs the jets where in wrong places the .20 was where the 42 was suposed to be. Was tould that it was supossed to have a air silentcer on carbs which it didn't have, found one and put it on. I'm stuck don't khow what else to do , anyone have any suggestion? Model # is 200stlcdr.

 

[miker-gr]

Re: rough or no idle long time to plane

Don't know if your motor have recirculation hoses!
These hoses suppose to remove the excess mixture from cylinders and route it back to cranksaft.Sometimes these hoses get pluged and the engine won't run good.I read it on a Seloc marine manual. I can check out for more details

 

[CharlieB]

Re: rough or no idle long time to plane

2 more things to check

Ensure that the smaller of the idle air jets is in the lower position, that carb cleaner sprays thru every passage and orifice, followed by compressed air

Depending upon which company's float bowl gasket you used, did the fuel 'well' gasket come separately, are they all in place?

 

[rick powell]

Re: rough or no idle long time to plane

small jets weren't in bottom air idle hole in none of the carbs before i rebuilt carbs but are now since rebuild and gaskets came with kits.

 

[Dhadley]

Re: rough or no idle long time to plane

The XP/GT loopers are not supposed to have an inner air silencer. The smaller of the 2 air bleed jets is not necessairly the idle jet.

 

[rick powell]

Re: rough or no idle long time to plane

you mean therer is nothing between the carbs and the carb cover? It shows a seal baffle to carbs.

 

[Dhadley]

Re: rough or no idle long time to plane

Are you using an inner air baffle? There isn't supposed to be one on an XP or GT looper. You'll have spacers between the cover and the base where the mounting bolts are.

You can run an inner air baffle but it'll run a little rich unless you rejet.

 

[rick powell]

Re: rough or no idle long time to plane

It only had the spacer and cover but was told it was suposed to have the silencer on it by a ranger boat dealer so i bought a used one to put on it but haven't put boat in the water yet. Waiting to see if there was anything else i needed to do first. Could the gas buld not pumping tight before starting been causing part of the problem?

 

[Dhadley]

Re: rough or no idle long time to plane

If it has XP / GT carbs it's not supposed to have the inner air baffle. It is supposed to have the air box cover. You can run the inner air box baffle (which means you don't need the spacers) but it has to be jetted for it.

Now, if your carbs are off of another looper that wasn't an XP / GT then yes, it is supposed to run the inner baffle.

 

[rick powell]

Re: rough or no idle long time to plane

according to the parts manual the carbs body part #is 0398579 but the ones on it are part# 398743. Can't pull the 398743 # up on computer to see if this is right carbs. Is this a aftermarket carb?

 

[Dhadley]

Re: rough or no idle long time to plane

That's probably a casting number which won't be a part number. Sometimes they are the same, sometimes not. What are the numbers on the jets? (Including the high speed jet)

Another thought - when you cleaned the carbs and put in new kits, there were 2 carb body to throttle body O rings. One slightly larger than the other. Did you use the larger one or the smaller one?

 

[rick powell]

Re: rough or no idle long time to plane

the jets on the idle are 20 and 48 the high speed is 76. I used the small o ring gasket.

 

[Dhadley]

Re: rough or no idle long time to plane

OK, good info. Those are not XP/GT carbs. I'll see if I can figure out what set they are. The 76 is a 76D not 76C, right?

 

[rick powell]

Re: rough or no idle long time to plane

right. thanks for sticking with me on this. I've been on here before and get a few answers then nothing , THANKS ALOT.

 

[Dhadley]

Re: rough or no idle long time to plane

There was a change in carbs on those small bore XP/Gts when they were new. Some guys with bass boats had a hard time power loading. Basically the motor sat so low in the water there was a lot of backpressure in the mid section. As the nose came up the motor went even further in the water and sometimes the motor stalled. The solution was to put on slightly smaller carbs. The trade off was a loss of a couple hundred rpm on top. I suspect your carbs were replaced under warranty (way back when).

 

[Dhadley]

Re: rough or no idle long time to plane

Are the air jets 20 & 42 or 20 & 48?

 

[rick powell]

Re: rough or no idle long time to plane

do you know anything i can do to help correct this problem? The motor has a racker S.S. 3 blade prop 4 1/2 by 24. Is this a good prop for this motor? Also running 5000 rpm at w.o.t. is this low?

 

[rick powell]

Re: rough or no idle long time to plane

they are 48 on the large ones. pretty sure the small ones are 20 can't make out clearly.

 

[Dhadley]

Re: rough or no idle long time to plane

OK, looks like the 1988 XP / GT carbs are pretty close. 76D high speed jets, 42 for the mid range and 20 for idle. The idle circuit is the lower of the 2 air jets.

Again, this is the jetting without the inner baffle and using the spacers.

Make sure you're using 87 octane too, not 93.

 

[rick powell]

Re: rough or no idle long time to plane

thanks, Will make sure on jets and take off air silencer. I put in 89octane gas next tank i will use 87 octane. Did you get the message about my prop and r.p.m.'s?