Clams Canino or Laddies

[Virago85]

I got a 1977 mercury 175 done the link & sync set timing everything for the last 3 years Ive notice it was idling high around 900 to 1000 in N in the water Ive done every thing to fix this the carbs have been resealed check for vacum leaks put 3 diffrent tachs on it set them all to 12 poles or 6 pulse the carbs have no idle adjustments on them the motor runs great but would realy like to get it idling lower if I move the triger as for as it will go the idleing does not lower by ear are tach but if held to long the motor will begen to chuge and die what do you guy think would make it idle like this you think the carb idle jet need to be replaced thanks in advance

 

[Laddies]

Re: Clams Canino or Laddies

You should be idleing at 650 to 700 in gear. Have you checked your bleed lines for cracks, most of the earlier V/6s tended to load up and smoke at idle does your? If it doesn't try triming it all the way down and see if that slows the idle, in is rich, out is lean and that might give some answers or at lest ideas---Bob

 

[rodbolt]

Re: Clams Canino or Laddies

hello<br /> also double check your tach with an inductive one. the tach drive signal may be off slightly. if it was in fact idling that high you should also see a definate stiffness trying to go from in gear to netrual. sometimes the idle timing has to be set a few degrees further ATDC to slow them down. 900-100 in netrual is about right on a flusher but its not supposed to be over 750 in netral in the water. I cant remember when the idle stabilizer feature came out but yours may have had it. without your seriel # I cant find it and even then I am not sure my manuals go back that far. what is the idle timing set at now ? what is your in gear idle speed with the boat untied and idleing in the pond ?

 

[Virago85]

Re: Clams Canino or Laddies

Originally posted by Laddies:<br /> You should be idleing at 650 to 700 in gear. Have you checked your bleed lines for cracks, most of the earlier V/6s tended to load up and smoke at idle does your? If it doesn't try triming it all the way down and see if that slows the idle, in is rich, out is lean and that might give some answers or at lest ideas---Bob

in is rich, out is lean What does this mean I have no adjustments on carb Yes I have Checked bleed lines will double check yes it does idle lower when trimed al the way down but only to about 800, one other thing it shifts easy in and out of forword but it is kind of stif going in and out of reverse

 

[rodbolt]

Re: Clams Canino or Laddies

are the tests in or out of the water?<br /> if idle speed changes much while trimmi9ng check for needle valve leaks and float setting. so speed change will just be due to a lessening of back pressure more than 50 rpm or so may indicate a rich running at full trim in. usually caused by a needle leak or a float to high.if the rpm change is up and down on the flusher its normally a carb malfunction.

 

[Virago85]

Re: Clams Canino or Laddies

the test where done on the water the floats where set at 1/6 from base but where set with a tape measure so that may be the problem my be a bit to high will double check that as well Thanks will let you no the out come

 

[Laddies]

Re: Clams Canino or Laddies

Virago, I was just thinking and several years ago we had a older V/6 someone had put a idle stabilizer on in the shop, if yours had been updated with one that could be your problem--Bob

 

[Virago85]

Re: Clams Canino or Laddies

Ya that would be un idea but not in this case I wish it was it runs great just a little ok a lot high lol

 

[Virago85]

Re: Clams Canino or Laddies

Ok rechecked my carb floats and they are set at less then 1/6 not much though. the manual calls for 1/6 would that make it idle high

 

[Virago85]

Re: Clams Canino or Laddies

Can I get carb gaskets from napa If so does napa have a web site

 

[Virago85]

Re: Clams Canino or Laddies

One more thing the manual says measure from the base of carb to the botom of float 1/6" now are they considering the gasket flange with gasket removed the base are do they want me to go below the flange to the next lip which is about an 1/8" lower I'm thinking the lower lip becouse when I tilt my motor all way up fuel comes from carbs are is this normal

 

[Laddies]

Re: Clams Canino or Laddies

Virago, you can get the gaskets at NAPA, I don't set the floats the way your doing it so I cannot give you much advise on that way. We have a pressure gauge on a fuel line that we hook to a tank and the float bowl fuel connection, pump the bowl full to the boss on the inside of the bowl and set the fuel level to the top of the boss with 8# fuel pressure---Bob

 

[Virago85]

Re: Clams Canino or Laddies

If i set the top of float at 1/6 above boss on the inside of the bowl and hook the primer bulb up to it the fuel come just up to the top of the boss on the inside of bowl does this sound right and would to much fuel cause it to idle high Thanks for all your help

 

[Laddies]

Re: Clams Canino or Laddies

Thats the proper way, it tests the float height and the ability of the inlet needles to stop the fuel flow--Bob

 

[Virago85]

Re: Clams Canino or Laddies

Man Thanks! So the fuel should only come to the top of the boss on the inside of the bowl?

 

[Laddies]

Re: Clams Canino or Laddies

Yup

 

[Virago85]

Re: Clams Canino or Laddies

Man youve been a big help hopfuly this will fix my high Idle problem

 

[Clams Canino]

Re: Clams Canino or Laddies

maybe... but extra fuel usually won; tmake it idle high. Try disconnecting the idle stabilizer, it might be broken in "advanced" mode.<br /><br />-W

 

[Virago85]

Re: Clams Canino or Laddies

I wish I had an idle stabilizer Ive sprayed 2+2 every where looking for leaks with no luck just cant figure this out

 

[Virago85]

Re: Clams Canino or Laddies

Is there a chance that my motor my be sending out more then 12 pulse's this making it look like its idling high if so How could I check this