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  1. R

    Serial number

    Got a fella wanting to sell me a 20 Hp Merc outboard Serial number 7053484. Anyone know what year this is? Randy
  2. R

    Second mortgage for a carb?

    the holly 2 bbl carb i have on the 3.0 cobra im assuming is plugged up and may or may not be salvagable so for gits and shiggles i looked up the price of a new/reman for this 140 hp chev motor. What is so special about these carbs? I have seen them advertized in excess of $2000 Canadian. I...
  3. R

    Im fed up with this Boating life.

    Ok, I have just about had it with boating. They are a money drain and the most unreliable machines ever built. A push lawn mower is more dependable. I have had such horrible luck with this Cobra 3.0 engine as most know from past posts. This is the third engine in this lemon. The first had a...
  4. R

    Idle rpm 3.0 chev

    I am told the 3.0 should be set to around 700 rpm in the water, and that when in the water it will drop at idle as apposed to on ears. On muffs, mine idles at 1000 rpm but i dont like the way it grinds a little when going into gear so what should the idle be set at on muffs that wont stall the...
  5. R

    Does E3 make marine plugs?

    I have had excellent luck with E3 plugs in my Harleys and other gas engines and am wondering if E3s are available in Marine grade. I have a cobra 3.0 140hp chev vortec four cylinder engine and was wondering if they do. Randy
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    Exhaust Bellows 3.0 cobra

    These things sure are a money pit. I had the outdrive completely rebuilt two years ago and with some bad luck with a new engine and subsequent replacement engine i have about 10 our max on the outdrive. I was told the exhaust bellows was replaced however i noticed today there is a hole in the...
  7. R

    cobra 3.0 hesitates

    Im assuming its probably carb related. When coming off of idle, the motor will hesitate for a second as if too much fuel is being dumped. Only coming off of idle. Any where else it doesnt do it but if the engine is in gear, it will almost stall so i have to push through that dead spot rather...
  8. R

    installing tach 4 cyl inboard

    I have a 1991 Omc Cobra with the inboard inline four cylinder chev motor. Im replacing the indash Tach with a sieria Tach. On the back it has the setting for the engine. Instructions say set to half number of alternator poles. I have 6P, 5P, 4P8C, 3P6c and 2P4C . Of course the instructions...
  9. R

    Stickies on Winterizing 3.0 cobra

    I have been all over this forum and I know its right in front of me but im trying to find the proper proceedure to winterize a brand new 3.0 cobra 4 cylinder (Chev 140 hp). randy
  10. R

    1991 Sunbird Corsica 175 tarp/cover

    I have posted in other forums on here as well for various issues but what im looking for is a winter cover for my 1991 Corsica 175 bow rider i/o. Online there are all kinds of covers for the Sunbird "Corsair" model but viturally nothing anywhere for a "Corsica" model. I can't even find the...
  11. R

    What are these holes?

    The starboard side of the lower end near the water intake has two small 1/8 inch holes. They are perfectly round and when the ears are on and the motor is running they are pi$$ing out water. What are they there for and should I plug them up? Randy
  12. R

    suggestions on removing fuel from tank

    im lookin for ideas in how to remove the fuel from the tank of my 91 sunbird corsica i/o boat. I filled the tank up a month ago then wound up having to take the boat in for a new motor. The season is ending up here in Ontario so I was wanting to take most of the fuel out for the winter rather...
  13. R

    low compression 3.0 cobra (new)

    I had a brand new remanufactured 3.0 cobra (chev) engine installed last September in my 17 foot sunbird bow rider and its never been as good as the 130 i had previously. This one is a 140. I have had issues with it since day one and currently there is not 15 hours running time on it not...
  14. R

    Tach settings cobra 3.0

    My tach got jarred when i hit a big wave and the little dial I am told will sometimes move thowing it out of calibration. It is very difficult to see and even more difficult to pull out but i can see some numbers around the dial on the tach which needs a screwdriver. 1, 2,3,4,5,6. I have it...
  15. R

    E3 sparkplugs OMC 3.0 Cobra (chev)

    Does anyone know the E3 Plug available for the 140 Hp Cobra 3.0 chev motor? I like E3s and have good luck with them in other motors. randy
  16. R

    Looking for a prop

    I am looking for an OMC or universal prop (i have inserts) 13.5" diameter and 17 P 3 blade. I have been to three different marine supply shops and all they have are 15 and 15.5" props. I have tried four different props on my 16.5' bowrider and the larger diameter just will NOT give me the...
  17. R

    distance traveled per revolution

    So as the title of this thread implies I'm wondering if my math is sound. If a 17 pitch prop allows the motor to rev at 4000 rpm WOT and a 15 allows it to rev at 4650 WOT, then by doing the numbers the 15 should theoretically give me a faster speed. I come by this by calculating the...
  18. R

    thrust washer sizes (dimenions)

    I have an omc cobra that i just bought a new prop for. Aluminum 3 blade 17p. The thrust washer im using is a 14 mm Stainless and it fits the shaft and prop accordingly. However i do have brass washers that are 11 mm thick. To me they are not thick enough as i can hear and or feel rubbing...
  19. R

    3 blade SST vrs High five

    I have a 1991 sunbird corsica 175 Cobra with a brand spanking new 140 hp Chevy four cylinder engine. Out drive is total rebuild as well. The prop that originally came with this boat/motor is a stainless 391290 15 x 17. I also have a stainless 48-821154 17 high five. The motor like i said is...
  20. R

    3 blade stainless vs four blade aluminum

    I have both for my 91 sunbird corsica 175 with a brand new 140 hp chev motor. The aluminum is very light and i know they can and will flex. The stainless of course is three times heavier. I know stainless gives you more bite due to its rigidity, however does that weight play into any...
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