#1  
Old 20-03-2012
MCATTACK MCATTACK is offline
 
Join Date: May 2011
Posts: 19
Thanks: 1
Thanked 2 Times in 1 Post
Default power loss and surge?

Yamaha 30 hp 3 cyl

just started loosing power and then surge slightly.
I have cleaned all three carbs and checked the plugs
for spark. Could this be slow feed valve as in other thread?

What should i do now?

thanks, Paul
Reply With Quote
  #2  
Old 21-03-2012
jones jones is offline
Middle Aged Skip Rat
 
Join Date: Oct 2008
Posts: 1,468
Thanks: 211
Thanked 293 Times in 231 Posts
Default

Quote:
Originally Posted by MCATTACK View Post
Yamaha 30 hp 3 cyl

just started loosing power and then surge slightly.
I have cleaned all three carbs and checked the plugs
for spark. Could this be slow feed valve as in other thread?

What should i do now?

thanks, Paul
check your fuel line for air getting in 1st,best way is get the bulb hard and see if it holds it
Reply With Quote
  #3  
Old 21-03-2012
alana alana is offline
veteran
 
Join Date: Aug 2008
Location: guernsey.
Posts: 1,017
Thanks: 23
Thanked 195 Times in 166 Posts
Default

sounds like the fuel pump diaphragm. but check for blocked filters and air leaks first. is the pickup tube in the tank ok, how old is the fuel line and primer bulb. overtightened jubilee clips. the list goes on and on. theres a screw on the bottom of the carb bowls to drain them. open them and see if any muck or water comes out

Last edited by alana; 21-03-2012 at 18:52.
Reply With Quote
  #4  
Old 21-03-2012
Puckoon's Avatar
Puckoon Puckoon is offline
Demi-Loon Avec Plume and "S.M."(Honourary)
 
Join Date: Mar 2009
Location: brighton
Posts: 4,556
Thanks: 1,468
Thanked 1,001 Times in 673 Posts
Default power loss and surge

mine was doing something similar, power loss, then picking up, and it was the fuel pump diaphragm
__________________
Be Alert...................................................................we need more lerts ! ....................
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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

Forum Jump


All times are GMT +1. The time now is 08:39.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
This site and its contents copyright 2008 onwards to PracticalBoating.com and Friday Holdings Ltd

Ad Management by RedTyger