Go Back  Offshoreonly.com > Technical > General Q & A
help with carb adjustments >

help with carb adjustments

Notices

help with carb adjustments

Old 07-22-2009 | 08:59 AM
  #11  
Registered
 
Joined: Nov 2005
Posts: 4,554
Likes: 3
From: Fredericksburg, Va
Default

Having to pump the throttle once when hot to get to start not abnormal...it's not fuel injected, so yes you need that shot of fuel to lite it off a lot of the time...
ezstriper is offline  
Reply
Old 07-22-2009 | 09:20 AM
  #12  
Registered
 
Joined: Jan 2009
Posts: 935
Likes: 0
From: Wilson, NY
Default

sir...what 4 blade are you running ?
tinman565 is offline  
Reply
Old 07-22-2009 | 09:40 AM
  #13  
Thread Starter
Registered
 
Joined: Sep 2007
Posts: 1,051
Likes: 0
From: Bettendorf, Iowa
Default

Originally Posted by tinman565
sir...what 4 blade are you running ?
i have 500hp and a 1.36 ratio drive and am running a 24p bravo 1. Which was recomended by griff and BBlades. I would consult them for any prop needs. My only problem is that i need to find another one to have labbed by bblades so i am not out a prop.
Fixxxer22 is offline  
Reply
Old 07-22-2009 | 10:57 AM
  #14  
Registered
 
Joined: Mar 2003
Posts: 365
Likes: 0
From: Manassas Va.
Default

Check the power vavles.
45SS is offline  
Reply
Old 07-22-2009 | 11:27 AM
  #15  
Thread Starter
Registered
 
Joined: Sep 2007
Posts: 1,051
Likes: 0
From: Bettendorf, Iowa
Default

Originally Posted by 45SS
Check the power vavles.
i do only have one power valve.... the rebuild kit had two power valves in it but they looked different than the on in my carb. so i did not replace it. Is there a spec on what power valve goes in the holley 800 on the 500hp?
Fixxxer22 is offline  
Reply
Old 07-22-2009 | 11:32 AM
  #16  
Wobble's Avatar
SORE MEMBER
 
Joined: Apr 2004
Posts: 6,984
Likes: 2
From: 29°50'49.74"N 95° 5'17.55"W.......TEXAS
Default

Originally Posted by Fixxxer22
i do only have one power valve.... the rebuild kit had two power valves in it but they looked different than the on in my carb. so i did not replace it. Is there a spec on what power valve goes in the holley 800 on the 500hp?
Actually your ideal power valve is determined by manifold vacuum. It is loss of vacuum that allows the powervalve to open.

here is some good info http://www.holley.com/data/TechServi...wer_valves.pdf
Wobble is offline  
Reply
Old 07-22-2009 | 11:55 AM
  #17  
Wobble's Avatar
SORE MEMBER
 
Joined: Apr 2004
Posts: 6,984
Likes: 2
From: 29°50'49.74"N 95° 5'17.55"W.......TEXAS
Default

more good info http://www.holley.com/TechService/Library.asp
Wobble is offline  
Reply
Old 07-22-2009 | 09:18 PM
  #18  
AIR TIME's Avatar
Registered
20 Year Member
 
Joined: Dec 2000
Posts: 6,283
Likes: 1
From: EASTON MA.
Default

Originally Posted by eichhoma
your starting point on the mixture screws will probably be 1 - 1 1/4 full turn out. with the boat in the water, I set idle first at about 900 rpm. Then put the boat in gear, if it doesnt stumble when put in gear i would start going in with the mixture screws in 1/8 turn increments on all four corners until it stumbles when you put it in gear. put it in gear after every adjustment. Once it stumbles, back it back out about 1/4 turn and you will be set pretty well. That has worked for me as I had to fool with my carbs wuite a bit when they came back from Nickerson in May. That will get you very close. And you may have to fine tune the idle after you get themixture right. If its a dominator type carb, make sure you adjust idle in the front and back, there is 2 adjustment screws for idle on a dominator
he has a 800 he wrote, I had the same thing happen with my nickerson 1050 dom but someone stole it before I got it to idle right, and went with CFM DEAN GELLNER said they were very good and the carb is nicer looking but that 670hp motor is sitting now a 572 blower is being finished.
AIR TIME is offline  
Reply
Old 07-28-2009 | 02:11 AM
  #19  
Griff's Avatar
Charter Member # 55
25 Year Member
Charter Member
Super Moderators
 
Joined: Oct 2000
Posts: 20,241
Likes: 2,490
From: Omaha/LOTO
Default

Originally Posted by Fixxxer22
i do only have one power valve.... the rebuild kit had two power valves in it but they looked different than the on in my carb. so i did not replace it. Is there a spec on what power valve goes in the holley 800 on the 500hp?
6.5 on stock HP 500 carb
Griff is offline  
Reply

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 On
Pingbacks are On
Refbacks are On


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.