Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 09-08-2010, 08:44   #1
Registered User

Join Date: Aug 2010
Posts: 1
Yahama 4hp Outboard

Have a 4 HP Yahama OB 2007..runs great until last week...starts fine runs fine until i crank it up and the prop no longer works and the engines just revs up...cut back on rpms and prop kicks in again...never has done this before, i could go max rpms and it would go but now put in gear and once i hit a certain point no prop and engine just revs up..cut down on rpms and prop engages....
__________________

__________________
north port is offline   Reply With Quote
Old 09-08-2010, 09:03   #2
Senior Cruiser
 
FSMike's Avatar

Cruisers Forum Supporter

Join Date: Aug 2009
Location: Bahamas/Florida
Boat: Solaris Sunstar 36' catamaran
Posts: 2,654
Images: 5
I'm not familiar with that particular model but it sounds to me like the propeller hub is partially stripped out and on its way to being completely stripped. If so you will probably need to buy a new one.
__________________

__________________
Sail Fast Live Slow
FSMike is offline   Reply With Quote
Old 09-08-2010, 09:18   #3
Registered User

Join Date: Jun 2010
Location: Easton, MD
Boat: Catalina 22 Capri
Posts: 1,029
Check the shear pin on the prop. Small outboards like that dont have hubs on the prop, they use shear pins instead.
__________________
kmacdonald is offline   Reply With Quote
Old 09-08-2010, 10:50   #4
Registered User

Join Date: Dec 2009
Location: Ontario
Boat: 5 m Bolger runabout, plus a Starwind 860 power tri under construction
Posts: 248
IIRC, the newer Yamahas have a rubber hub... the older ones having a conventional shear pin (don't quote me on that, though). If a shear pin goes, the prop slips at all speeds, so I'm guessing partially stripped rubber hub as FSMike suggests.
Similar symptoms can be created by weeds wrapped around the prop or lower unit, but I presume our OP has already cleared any vegetation from his engine.
__________________
Matt Marsh
marshmat is offline   Reply With Quote
Reply

Tags
outboard

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
MPG with Johnson 4hp Sailmaster on an Islander 21 ? outdoorsman37 Monohull Sailboats 2 17-04-2010 21:26
For Sale: Portugal - 21' Sloop with 4hp Outboard boatman61 Classifieds Archive 8 11-03-2010 17:16
For Sale: '09 West Marine Inflatable with Yamaha 4hp 4-Stroke MICHAEL K Classifieds Archive 2 07-02-2010 08:56
Mercury outboard book? Or just outboard? Jack Long The Library 2 17-09-2008 09:33



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 04:32.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.