#1  
Old 06-07-2011
mickyking mickyking is offline
 
Join Date: Jul 2011
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Default Mercury 60hp EFI (2008) Revs Won't go above 4,500rpm

I have a 2008 Mercury 60hp efi 4-stroke fitted to my Predator 165 and it won't go above 4,500 rpm. Engine does not miss a beat and has no issues when running up, etc.
Is the most likely issue the throttle cable needing adjsuted, and if so is there an easy way to do this?
Reply With Quote
  #2  
Old 06-07-2011
jones jones is offline
Middle Aged Skip Rat
 
Join Date: Oct 2008
Posts: 1,386
Thanks: 202
Thanked 272 Times in 216 Posts
Default

Quote:
Originally Posted by mickyking View Post
I have a 2008 Mercury 60hp efi 4-stroke fitted to my Predator 165 and it won't go above 4,500 rpm. Engine does not miss a beat and has no issues when running up, etc.
Is the most likely issue the throttle cable needing adjsuted, and if so is there an easy way to do this?
what size and make prop do you have
Reply With Quote
  #3  
Old 06-07-2011
mickyking mickyking is offline
 
Join Date: Jul 2011
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Dont' know! - Which I know is no help at all.

I bought the boat x4 months ago and it is now moored in the harbour so I can't check this easily. The engine was supplied with the boat from the main dealer in 2008 (Ash Marine) so I am assuming that it was specified correctly.

The engine did rev freely to 5,500 rpm when I first put the boat in the water but this stopped after the first trip.
Reply With Quote
  #4  
Old 06-07-2011
robo's Avatar
robo robo is offline
Archive Master
 
Join Date: Feb 2009
Location: st.helens
Posts: 1,637
Thanks: 428
Thanked 438 Times in 319 Posts
Default

you may have a dirty bottom
Reply With Quote
  #5  
Old 06-07-2011
Russ T Hinge's Avatar
Russ T Hinge Russ T Hinge is offline
veteran
 
Join Date: Oct 2008
Location: head in the clouds
Posts: 6,627
Thanks: 3
Thanked 1,331 Times in 1,019 Posts
Default

Quote:
Originally Posted by mickyking View Post
Is the most likely issue the throttle cable needing adjsuted, and if so is there an easy way to do this?
Very doubtful but take off the engine cover and air filter, open throttle fully, make sure it goes tight against throttle stop on crankcase, next look into the venturi to see if it wide open.
__________________
I do not, do...if's... buts... or maybe's !
If you,re busy doing nothing...........how do you know when you,ve finished ?
You can only be certain of three things....Tax...death and RTH !...
WARNING....Russ T is a hazard to himself let alone others so any advice he offers is to be treated with suspicion and acted upon at your own risk !!!!!....
Reply With Quote
  #6  
Old 06-07-2011
jones jones is offline
Middle Aged Skip Rat
 
Join Date: Oct 2008
Posts: 1,386
Thanks: 202
Thanked 272 Times in 216 Posts
Default

is it the inline 4???? it should be pulling 6000 @ WOT...if you have'nt changed nothing since you last ran then try fuel filter also trim the motor out a hole and see iff you get an increase in RPM's. try simple things 1st like what Russ has stated with checking throttle then move on but remember to check 1 item at a time and iff no change then return to original setting before next check or the dog will be chasing its tail
Reply With Quote
  #7  
Old 06-07-2011
Captain Birdseye's Avatar
Captain Birdseye Captain Birdseye is offline
Scoop gremlin apprentice
 
Join Date: Aug 2009
Posts: 490
Thanks: 17
Thanked 101 Times in 73 Posts
Default

Quote:
Originally Posted by robo View Post
you may have a dirty bottom
I agree here think this is the first place to look as its moored in the harbour .. i would think its well scabbed up if it hadn't been antifouled
__________________
Captain hook................
Reply With Quote
  #8  
Old 07-07-2011
mickyking mickyking is offline
 
Join Date: Jul 2011
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Default

Thanks everyone.

Don't think the bottom will be that bad after x12 weeks as boat is anti-fouled (mate has same boat and set up on mooring next to me and has no issues).

Will try basics first - cable and throttle travel (leave in neutral and open up valve fully to check revs) / then air filter then fuel filter.

After that????
Just go out on my mates boat if I want to go faster ????
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 07:03.


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