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  1. M

    Need crossflow carb

    anyone have a 1 3/8 lower carb or a pair of carb's, I could use primers or chokes<br />I want to put them on 79 140 <br />Also does anyone know if individual carb parts such as throttle shafts can be purchased from dealers? A shaft might get me going as the one I have is worn.<br /><br />Also...
  2. M

    carb Primers-retrofit a 79 v4

    I'm buying some carbs that use primers They are off a 84 v6 and the part number is 394329 if anyone could check that year for me. Also Should there be a pump that sends the fuel to the nozzles and if so where does it mount on the v6 and where would I put it on my 79 v4. <br />Also do I use the...
  3. M

    Crossflow venturi size.....Effects?

    I'm replace carbs on a 79 140 with 1 3/8 venturi's. Can anyone tell me if I can boost low end performnance with a smaller venturi or would that greatly effect top end on this motor. I've heard this but am unclear about its effect. <br /><br />Question 2 anyone know if carbs from a 100hp cross...
  4. M

    79 140 backfires-its the carbs but why?

    ok if you've been following my post on this engine I have new info. I installed carbs from a 73 135 that runs good. With those carbs the motor runs great. I can retard the timming as much as I can and I don't get backfires. I can slow it down to 500 rpm with the timing and its smooth enough to...
  5. M

    94 merc 150 xr6 good or bad

    I looking at a 1995 19' bluewater walleye style boat with a 94 merc 150 xr6 which is carburated.<br />Qwner guesses about 400 hours. Just wondering if these motors are ok or if they should be avoided. I'm not too familar with them. I know the efi's and the optis get better gph but ofcourse they...
  6. M

    more on 79 140 that backfires

    After a lot of work I beleive that the backfire's were caused by my retarding the idle timing too much because I didn't have a timing light. I did this to try and get it to slow down. I have now used one to set slow speed timing to 4degrees. The problem now is the same as when I started working...
  7. M

    79 johnson 140 backfires thru prop

    I just bought a 79 140 johnson at an auction so I know no history on it except previous owner said he thinks it may need a tune up. It runs and starts well except at idle. When I first started the motor I found that it was idling way too fast around 15-1800 rpm's I guess. Compression is good on...
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