JKTrevecca
Petty Officer 2nd Class
- Joined
- Sep 20, 2009
- Messages
- 110
Thank you in advance for taking the time to read this. I'll do my best to be concise.
Purchased a 1986 90hp this week. Carbs were professionally rebuilt in 3/2014 by four corners marina in nashville. I have all paperwork. In addition to carb rebuild, the bulb and fuel lines were replaced. Prior owner paid about 500 bucks for this. When I first purchased the boat, it would start and run great for about 45 seconds at idle, then begin to miss on 1 cyl. I removed the "out" fuel line from the pump and attached a 4 foot hose. I then started the engine (had fuel in the carb bowls) and there was little to no fuel being pumped out of the fuel pump. I thought it had to be the fuel pump so I replaced it. Exact same thing with a new pump. Then I began to eliminate variables by swapping fuel tanks first - same issue. Then I took a known good fuel primer bulb and used it with a known good and clean portable tank. With that, the motor ran good continuosly so off to the river I went. In the water, the engine runs consistently but has what feels like an intermittent miss and tops out at 4200 RPM and 30mph on a 16 ft fiberglass v-hull run-about. (junk boat that the motor came with).
Compression is 115,115,110
Fuel pumps very well with the "good" bulb and tank (I tested it using method captioned above)
Since the "new" bulb went bad after only 3-4 months, is it possible or likely the carbs are dirty again too? The prior owner said he only used the boat 1 time since the carbs were rebuilt and was selling the boat to avoid forclosure on his house.
Is it reasonable for me to ask the marina that re-built the carbs to check and warranty their work or is 3-4 months too long to expect them to look at it again without charging me?
Any other advice? I can post pix and a video later if that helps. It runs consistent but my 70hp Evinrude on a 16ft aluminum deep v has more power and certainly higher RPMS and top speed. I bought the new boat with intentions of using the 90hp yamaha on my fishing boat but if I can't get it to run any better than this, I'll just flip and sell the entire rig as-is and keep my 70hp and be happy.
Thanks again. I appreciate your time and sharing of knowledge!
-- Jason
Purchased a 1986 90hp this week. Carbs were professionally rebuilt in 3/2014 by four corners marina in nashville. I have all paperwork. In addition to carb rebuild, the bulb and fuel lines were replaced. Prior owner paid about 500 bucks for this. When I first purchased the boat, it would start and run great for about 45 seconds at idle, then begin to miss on 1 cyl. I removed the "out" fuel line from the pump and attached a 4 foot hose. I then started the engine (had fuel in the carb bowls) and there was little to no fuel being pumped out of the fuel pump. I thought it had to be the fuel pump so I replaced it. Exact same thing with a new pump. Then I began to eliminate variables by swapping fuel tanks first - same issue. Then I took a known good fuel primer bulb and used it with a known good and clean portable tank. With that, the motor ran good continuosly so off to the river I went. In the water, the engine runs consistently but has what feels like an intermittent miss and tops out at 4200 RPM and 30mph on a 16 ft fiberglass v-hull run-about. (junk boat that the motor came with).
Compression is 115,115,110
Fuel pumps very well with the "good" bulb and tank (I tested it using method captioned above)
Since the "new" bulb went bad after only 3-4 months, is it possible or likely the carbs are dirty again too? The prior owner said he only used the boat 1 time since the carbs were rebuilt and was selling the boat to avoid forclosure on his house.
Is it reasonable for me to ask the marina that re-built the carbs to check and warranty their work or is 3-4 months too long to expect them to look at it again without charging me?
Any other advice? I can post pix and a video later if that helps. It runs consistent but my 70hp Evinrude on a 16ft aluminum deep v has more power and certainly higher RPMS and top speed. I bought the new boat with intentions of using the 90hp yamaha on my fishing boat but if I can't get it to run any better than this, I'll just flip and sell the entire rig as-is and keep my 70hp and be happy.
Thanks again. I appreciate your time and sharing of knowledge!
-- Jason