Tin_Bubbles
Cadet
- Joined
- Jun 15, 2017
- Messages
- 14
Welp. First post, here goes nothing.
The engine is a 1966 Johnson Super SeaHorse 40HP *RDS-28B* (If anyone can tell me what the B is for I'll give you a high-five).
I recently acquired this engine, after it had been sitting for quite some time. I did the usual things, spark plugs (gapped correctly), impeller, resealed lower unit,fuel lines blah blah blah. This engine was in remarkably good shape for having sat for awhile. Whoever owned it before me really took care of it and put it away correctly.
But this past week I really went to town rebuilding the carb. Everything came apart, everything got an ultra-sonic bath, everything got sprayed and aired out. And of course I installed a carb rebuild kit from this site. Woohoo!
So. It idles great at low speed, it purrs, and is quite responsive. Now when I give it some juice, we start running into issues. It will rev high and hold steady for a bit, but over the course of maybe 30-45 seconds, it will slowly start revving down. By slowly I mean that while I'm holding the throttle steady at high RPM, you can hear the engine slowly starting to lose power. It won't stall, but slowly lose power.
Then other times I will quickly decrease throttle and it will "surge", or just hold it's RPMs for awhile until it decides it wants to come back down.
I cleaned out every office of this thing, and form my research here some people talk about adjusting the high speed needle. However, on this carb, it's the kind where the jet is buried under/past the drain plug on the bottom of the bowl. I tightened it snug, didn't over-do it. Everything seems tight/air-tight. I do notice a few air bubbles in the fuel line, not many at all, and they don't seem to increase or decrease with the RPMs. They are about the size of a copper BB from a BB gun. Itty bitty.
I should mention all this testing is done in a barrel, with the engine in neutral.
Should the high speed jet still be adjusted even thought i would have to access it through the bowl drain? HALP!
The engine is a 1966 Johnson Super SeaHorse 40HP *RDS-28B* (If anyone can tell me what the B is for I'll give you a high-five).
I recently acquired this engine, after it had been sitting for quite some time. I did the usual things, spark plugs (gapped correctly), impeller, resealed lower unit,fuel lines blah blah blah. This engine was in remarkably good shape for having sat for awhile. Whoever owned it before me really took care of it and put it away correctly.
But this past week I really went to town rebuilding the carb. Everything came apart, everything got an ultra-sonic bath, everything got sprayed and aired out. And of course I installed a carb rebuild kit from this site. Woohoo!
So. It idles great at low speed, it purrs, and is quite responsive. Now when I give it some juice, we start running into issues. It will rev high and hold steady for a bit, but over the course of maybe 30-45 seconds, it will slowly start revving down. By slowly I mean that while I'm holding the throttle steady at high RPM, you can hear the engine slowly starting to lose power. It won't stall, but slowly lose power.
Then other times I will quickly decrease throttle and it will "surge", or just hold it's RPMs for awhile until it decides it wants to come back down.
I cleaned out every office of this thing, and form my research here some people talk about adjusting the high speed needle. However, on this carb, it's the kind where the jet is buried under/past the drain plug on the bottom of the bowl. I tightened it snug, didn't over-do it. Everything seems tight/air-tight. I do notice a few air bubbles in the fuel line, not many at all, and they don't seem to increase or decrease with the RPMs. They are about the size of a copper BB from a BB gun. Itty bitty.
I should mention all this testing is done in a barrel, with the engine in neutral.
Should the high speed jet still be adjusted even thought i would have to access it through the bowl drain? HALP!
