iboats - The #1 Store For Everything Boating
 
  #1  
Old December 3rd, 2008, 01:15 AM
duck hunter1 duck hunter1 is offline
Cadet
 
Join Date: Dec 2008
Posts: 2
Default Yamaha 25hp 2-Stroke 1980's fuel issue

When motor starts after having sat, it runs until the fuel bowl is empty. won't allow any more fuel to enter fuel bowl. After opening bowl screw on bottom and tapping on carb, lift up and drop the motor, pour fuel in carb, I can finally get the fuel to flow to the bowl. (There is no obstruction in the fuel line, have installed a new fuel line, have removed and cleaned/checked carb and float and all appears to be fine). Once it starts again, it runs fine all day without a problem until the next time I take the boat out). What else should I be looking for to solve the problem?
Reply With Quote
  #2  
Old December 3rd, 2008, 01:42 AM
Yamajoe's Avatar
Yamajoe Yamajoe is offline
Petty Officer 1st Class
 
Join Date: Oct 2007
Posts: 264
Default Re: Yamaha 25hp 2-Stroke 1980's fuel issue

You need to replace your float valve needles, they are sticky. Inside the body of your carb is a float, when fuel level drops the float drops allowing more fuel to top the chamber up, float rises and stops the entry of more fuel into the bowl. A sticky needle valve (rubber tipped) prevents fuel from entering the bowl; the other problem we have with these valves is when the tips are damaged/frayed it does not shut off the entry of fuel, this situation leads to fuel overflowing from the side of carbs.
Reply With Quote
  #3  
Old December 3rd, 2008, 11:47 PM
duck hunter1 duck hunter1 is offline
Cadet
 
Join Date: Dec 2008
Posts: 2
Default Re: Yamaha 25hp 2-Stroke 1980's fuel issue

Thanks for the info; will try that next and thank you for your service to our Country.
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Yamaha 4 stroke 25hp rick_l Yamaha & Suzuki Outboards 2 August 17th, 2009 11:56 AM
Power Trim Issue w. 2 stroke 90 Yamaha nmiller Yamaha & Suzuki Outboards 4 November 21st, 2007 05:36 PM
Yamaha 225 4-stroke, electrical issue dswanson Yamaha & Suzuki Outboards 2 June 11th, 2007 05:12 AM
2003 Nissan 25hp 4 stroke hard starting issue oakfam Honda & Tohatsu/Nissan Outboards 4 March 30th, 2006 05:24 AM
Yamaha 25hp Two-Stroke Tomxx7 Non-Repair Outboard Discussions 1 May 25th, 2005 11:47 AM

iboats Forum Directory
Over 100,000 forum posts organized by topic
Outboard Motor Topics
Mercury Outboards
Johnson Outboards
Evinrude Outboards
Force Outboards
Yamaha Outboards
Mariner Outboards
Suzuki Outboards
Honda Outboards
Chrysler Outboards
Tohatsu Outboards
Nissan Outboards
Outboard Motors: non-repair
Vintage Outboards

I/O and Inboard Topics
MerCruiser
OMC I/O, Inboard
Volvo Penta

Propeller Help
Boat Propellers

Boat Repair and Products
Boat Building and Repair
Fiberglass Boat Repair
Marine Electronics
Boat Trailers and Towing
Boat Names
Boat Covers
Boat Parts

Boating Activities Talk
Boating Topics and Questions
Boating Activities and Destinations
Boating Blunders
Boat Shows
Wakeboarding
Water Skiing

Fishing Discussions
Freshwater Fishing
Saltwater Fishing

Boat Type Topics
Aluminum Boats
Bass Boats
Bowrider Boats
Center Console Boats
Cruiser Boats
Cuddy Cabin Boats
Deckboats
Fishing Boats
Fish and Ski Boats
Houseboats
Jet Boats
Jon Boats
Pontoon Boats
Powerboats
PWC Forum
Ski Boats
New Boats
Used Boats

Boat Manufacturers
Boats 250+ Manufacturers
Bayliner Boats
Sea Ray Boats
Zodiac Boats



Outboards

Power Heads

Lower Units

Propellers

Inflatable Boats

Boat Manuals

Engine Parts

All times are GMT -4. The time now is 05:14 PM.