Like Tree17Likes

What carbs would you use for a stock 420

Reply
Old 10-11-2017, 11:14 AM
  #1
VIP Member
VIP Member
Thread Starter
 
formula1's Avatar
 
Join Date: Apr 2001
Location: Southwest, FL
My Boats: Formula 292-Sold! :(
Posts: 856
Default What carbs would you use for a stock 420

What carbs/CFM would you use on stock 420's with TRS setup?
formula1 is offline  
Reply With Quote
Old 10-11-2017, 11:33 AM
  #2
Registered
Trade Score: (1)
 
Join Date: Oct 2013
Posts: 1,421
Default

Quickfuel 850M
Baja Rooster is offline  
Reply With Quote
Old 10-11-2017, 12:09 PM
  #3
Platinum Member
Platinum Member
Trade Score: (7)
 
getrdunn's Avatar
 
Join Date: Feb 2009
Location: NW Michigan
My Boats: 12 meter
Posts: 4,820
Default

Otherwise Holley 800 dp. I think the marine is the 8022. They ran extremely well on 454/480 hp's. Endless options really but all I can do is speak from my own experience.
getrdunn is offline  
Reply With Quote
Old 10-11-2017, 12:16 PM
  #4
VIP Member
VIP Member
Thread Starter
 
formula1's Avatar
 
Join Date: Apr 2001
Location: Southwest, FL
My Boats: Formula 292-Sold! :(
Posts: 856
Default

I was wondering what the STOCK ones would have came with new. The dealer wants to replace the carbs instead of rebuilding them. He is thinking 650's. Seems a little lite to me.
formula1 is offline  
Reply With Quote
Old 10-11-2017, 12:26 PM
  #5
Registered
 
Join Date: May 2012
My Boats: '86 Formula 206, '89 Formula 272 (Sold), '87 Formula 311
Posts: 1,413
Default

Stock is 800 double pump holley 9022. 76/87 jets i believe
Mr Maine is offline  
Reply With Quote
Old 10-11-2017, 12:39 PM
  #6
SB
Registered
Trade Score: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 8,787
Default

Quote:
Originally Posted by formula1 View Post
I was wondering what the STOCK ones would have came with new. The dealer wants to replace the carbs instead of rebuilding them. He is thinking 650's. Seems a little lite to me.
Understandable at $100+hr, but you'd be better to take them off and have someone else rebuild them.
SB is offline  
Reply With Quote
Old 10-11-2017, 12:41 PM
  #7
Charter Member # 55
Charter Member
 
Griff's Avatar
 
Join Date: Oct 2000
Location: Omaha
My Boats: .......32............. ...............Active Thunder....
Posts: 15,654
Default

Quote:
Originally Posted by formula1 View Post
I was wondering what the STOCK ones would have came with new. The dealer wants to replace the carbs instead of rebuilding them. He is thinking 650's. Seems a little lite to me.
Find a new dealer. Stock carbs were Holley 800cfm
MILD THUNDER and endeavor1 like this.
Griff is offline  
Reply With Quote
Old 10-11-2017, 01:18 PM
  #8
VIP Member
VIP Member
Thread Starter
 
formula1's Avatar
 
Join Date: Apr 2001
Location: Southwest, FL
My Boats: Formula 292-Sold! :(
Posts: 856
Default

Quote:
Originally Posted by SB View Post
Understandable at $100+hr, but you'd be better to take them off and have someone else rebuild them.
Maybe I can keep them as spares.

Quote:
Originally Posted by Griff View Post
Find a new dealer. Stock carbs were Holley 800cfm
I believe the motors are stock 420's but he is thinking they are 370's. Either way, they have been rebuilt. From what I can tell there is an aluminum intake and Stainless Marine exhaust on it with 420 air breathers. I'm buying this boat and he is doing
the carbs as part of the deal. So, I would rather have new ones. I just don't want too small CFM.

Dumb question, would there be a problem if I got him to get 800's when it should only have 650 or 700? Is it gonna run too rich?
formula1 is offline  
Reply With Quote
Old 10-11-2017, 02:37 PM
  #9
Platinum Member
Platinum Member
 
Knot 4 Me's Avatar
 
Join Date: Jun 2005
Location: Central IL
My Boats: Old/Heavy/Slow
Posts: 6,593
Default

If your dealer cannot tell what carbs are on the engines and what carbs should be on the engines then I wouldn't even trust them to install new, proper CFM carbs.
Griff and endeavor1 like this.
Knot 4 Me is offline  
Reply With Quote
Old 10-11-2017, 02:42 PM
  #10
SB
Registered
Trade Score: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 8,787
Default

Not many mechanics (auto / boat / sled / motorcycle) know carburetors anymore. Younger generation is mostly FI. Yes, we are getting old.
BenPerfected and getrdunn like this.
SB is offline  
Reply With Quote
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



All times are GMT -5. The time now is 04:06 PM.


Copyright 2011 OffShoreOnly. All rights reserved.