Tweet
Hello,
I have what I believe to be a 1992 60HP Johnson 3 cyl, J60TLENE. The engine is low time, good compression on all cyls. I find that it is hard to start when cold and fires of on one cyl until the Rs come up and then the others fire off. Also when I idle or troll at low Rs she seems to load up and run on less then the 3 cyl until I give her a twist of the throttle and then the others fire off and there is a lot of smoke until it clears. Again mid range and high range (5200)rpm)is fine. Transition is fine once she fires on all 3. I am an old ASE auto tech and I grew up with 2 strokes. My experience tells me that the idle circut is to rich on one or more of the carbs and that is what might cause a cyl or 2 to load up and stop firing until throttle is applied and the cyl clears and fires off. My question is; Is there a idle adjustment on the carbs? My old 60 was jetted and had no adjustment. There is a needle adjustment on the side of the carbs, but I don't know if it is high speed or idle. Also, how do you adjusr multiple carbs? Hhow do you establish a base line to work from? I am used to tuneing multi cyl with one carb. And I know, my shop manual os already on order.
Any guidence greatly appreciated
Dave
I have what I believe to be a 1992 60HP Johnson 3 cyl, J60TLENE. The engine is low time, good compression on all cyls. I find that it is hard to start when cold and fires of on one cyl until the Rs come up and then the others fire off. Also when I idle or troll at low Rs she seems to load up and run on less then the 3 cyl until I give her a twist of the throttle and then the others fire off and there is a lot of smoke until it clears. Again mid range and high range (5200)rpm)is fine. Transition is fine once she fires on all 3. I am an old ASE auto tech and I grew up with 2 strokes. My experience tells me that the idle circut is to rich on one or more of the carbs and that is what might cause a cyl or 2 to load up and stop firing until throttle is applied and the cyl clears and fires off. My question is; Is there a idle adjustment on the carbs? My old 60 was jetted and had no adjustment. There is a needle adjustment on the side of the carbs, but I don't know if it is high speed or idle. Also, how do you adjusr multiple carbs? Hhow do you establish a base line to work from? I am used to tuneing multi cyl with one carb. And I know, my shop manual os already on order.
Any guidence greatly appreciated
Dave
Comment