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  1. SteveVT

    Value of Yamaha 25 hp outboard?

    Just a side point here, you say you find Yamahas better than Mariners you've owned. But I own a Mariner 8 and a 25 two stroke, and both are Yamahas under the decals. Mariner parts are now either extinct or overpriced. But the same parts are current and widely available for Yamahas -- all I've...
  2. SteveVT

    Is there a way to test a CDI unit? (696-85540-12 - 1986 8hp 2cy)

    Thanks kindly boscoe99. After I received my DVA converter I checked out the readings on all under-flywheel coils and the ignition coil. They were all within acceptable range. I changed out the spark plugs. Still No-go. Finally the replacement CDI unit I had sent for arrived. Replacing that...
  3. SteveVT

    Is there a way to test a CDI unit? (696-85540-12 - 1986 8hp 2cy)

    I'm glad you deleted the older unanswered thread on the Mercury Mariner forum, since I wanted to delete it myself but am not permitted to delete my posts on the iboats forum. But I don't get why you moved my post here to the Yamaha thread, and then writing "Is 99yam40 a dead fish." Uh, no he...
  4. SteveVT

    Is there a way to test a CDI unit? (696-85540-12 - 1986 8hp 2cy)

    Weird, I posted that on the Mercury Mariner forum, not here. Now the thread it was in has been deleted, and it seems to have been moved here for some reason. Anyway, it certainly doesn't apply to you guys! I'm very happy with your responses!! I'd appreciate it if someone deletes that post. I...
  5. SteveVT

    Is there a way to test a CDI unit? (696-85540-12 - 1986 8hp 2cy)

    I've opened this question on the Yamaha forum, since it is in fact a Yamaha under the hood, and no responses here.
  6. SteveVT

    Is there a way to test a CDI unit? (696-85540-12 - 1986 8hp 2cy)

    Thanks 99yam40, that gives me something else to check. Maybe I've been mistaking the problem of no spark in either cylinder by assuming it had to be coils or CDI. It could actually be a bad spark plug. Nevertheless the DVA is coming in case it isn't a plug.
  7. SteveVT

    Is there a way to test a CDI unit? (696-85540-12 - 1986 8hp 2cy)

    I have another related question -- if one of the two spark plugs in my 2 cylinder engine is bad, will that prevent the other spark plug from firing? The reason I ask is that there's a single coil for both plugs, and according to the Dangar video, Both plug wire outputs are connected internally...
  8. SteveVT

    Is there a way to test a CDI unit? (696-85540-12 - 1986 8hp 2cy)

    Thanks for that 99yam40. I found a couple of useful Dangar marine videos explaining troubleshooting the cdi system, and also one on building a DVA. I'm sending for one rather thn building, since the cost seems to have come down enough to make it worthwhile. I have some specs for the DVA voltage...
  9. SteveVT

    Is there a way to test a CDI unit? (696-85540-12 - 1986 8hp 2cy)

    More adventures with my 1986 Mariner 8hp 8M (manual) 6GI (Yamaha built). Had a great day going up and down river fishing, but she died at the very last moment coming into the dock, and couldn't be re-started. This time an ignition problem. No spark on either cylinder. I've pulled the coil and...
  10. SteveVT

    1986 Mariner 8hp 6G1 won't idle without choke

    Already done yesterday flyingscot, including polishing the float valve seat, and removing and cleaning all jets. The motor is running well in the tank. Will need to see how she goes on water.
  11. SteveVT

    Basic fuel questions

    Carb disassembly, cleaning and polishing completed. I went back to .625" on the float. Turns out the manual I have shows the wrong (or a different) carb for the 8hp Mariner, so the .78" float height doesn't apply. The engine runs really well in the tank - 1 pull start. Running great at all...
  12. SteveVT

    Basic fuel questions

    Thanks Sea Rider. Just did it! Anybody know the float height setting? (1986 Mariner 8M (Yamaha) 6G1 Carb is a 6G1-100AH26 I found one reference that said .78" but that seems way too high (float is quite angled at rest) . As found it was at .625" and looked relatively level.
  13. SteveVT

    Basic fuel questions

    Will polish the seat, for sure.
  14. SteveVT

    Why is a jet in 6G1 carburetor capped with a rubber plug?

    Thanks fazbullet.
  15. SteveVT

    Why is a jet in 6G1 carburetor capped with a rubber plug?

    Just a point of curiosity, the main jet in my '86 Mariner 8hp (Yamaha) 6G1 carburetor is what I would expect to see: a cast tube in the carb body with a brass jet orifice screwed into it at the bottom. But next to it is another longer tube and brass jet orifice, and instead of being open to the...
  16. SteveVT

    1986 Mariner 8hp 6G1 won't idle without choke

    Thank you both. I agree, I don't think higher octane will help this situation. Roscoe, thanks for that air leak test suggestion -- that's very clever. I'll try it. At this point there seem to be the main possibilities: Dirt in idle circuit or jets, float needle seat needs polishing, air leak at...
  17. SteveVT

    Basic fuel questions

    Sorry, let me rephrase that: Pull choke out, Pull starter rope. Engine starts then gradually bogs down from too much choke. Push in choke, engine picks up revs then leans out and dies. I think of the sound of 2 cycle motor running over-rich as "4 cycling", but maybe that's wrong, and apologies...
  18. SteveVT

    Basic fuel questions

    Thanks Flying Scot, I will be cleaning the whole carb again (3rd time) and this time also polishing the float needle seat per Sea Rider's comment above. I also suspect the idle circuit could be plugged again after getting the answers to my 3 questions above. I will also check the float height...
  19. SteveVT

    Basic fuel questions

    Also for cleaning and polishing the float needle valve seat, would toothpaste and a Q-Tip be okay, or do you have another way?
  20. SteveVT

    Basic fuel questions

    Thanks Sea Rider, I'll take it apart again. Did you mean the float needle seat, particularly....or the idle mix needle seat?
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