Go Back   TeamTalk > Maintenance Tips, How-tos and Refurbishing Topics > Engine / Drive Train

Reply
 
Thread Tools Display Modes
  #1  
Old 09-08-2010, 08:42 AM
dlboltond dlboltond is offline
TT Regular
 
Join Date: Feb 2010
Boat: 1992 Mastercraft Maristar 210
Location: Southeast
Posts: 46
Gas smell at idle

I have a 1992 Maristar with a 351 Indmar and a 4160 (i think) 80319 Holley 4 bl.

I am getting a strong gas smell at idle - people in back are getting loopy. It seems as though it is idleing pretty slow ~200. Could low idle be the problem, or is it just running to rich? Otherwise it runs great. What is the target idle RPM for this engine?

I put in new plugs but that didnt help. If it is the idle adjustment, could you give me some pointers on how to correct?
Reply With Quote
  #2  
Old 09-08-2010, 10:13 AM
oldairboater's Avatar
oldairboater oldairboater is offline
MC Fanatic
 
Join Date: Feb 2010
Boat: Mastercraft, Prostar, 1992, 351 Ford
Location: South
Posts: 574
Is this a new problem or was it like this when you bought it? Your idle speed is too low if your tach is right. There is an idle speed adjustment screw on the passenger side of the carb where the throttle cable ties into the throttle body. There are a few mixture screws on your carburetor also. Your carburetor may need more then just idle speed adjustment. Do a search on how to tune a holley. There are better people who know how to tune a holley. I just do trial and error.
Reply With Quote
  #3  
Old 09-08-2010, 10:31 AM
dlboltond dlboltond is offline
TT Regular
 
Join Date: Feb 2010
Boat: 1992 Mastercraft Maristar 210
Location: Southeast
Posts: 46
I am the second owner and it has always been like this. I believe the idle is low because it is lopes and when in gear, the boat seems to shake a little. I really dont know how to describe it. When I tap the throttle and the tach reads around 600 it is much smoother. Do you know what the idle should be?

I have the .pdf on tuning the carburateor and it says that there is a primary adjustment (the one you describe) a secondary screw. It says that "the adjusments should be made to both the primary and secondary screws in equal amounts". What does that mean?
Reply With Quote
  #4  
Old 09-08-2010, 10:49 AM
russfortin's Avatar
russfortin russfortin is offline
TT Newbie
 
Join Date: Jan 2007
Boat: 1987 mastercraft prostar 190 ford 351 / 2002 Prostar 197TT
Location: Kansas
Posts: 21
Just means that on both sides of the carb, there are mixture screws. if you change one, change the other the same amount. Good rule of thumb is turb them all the way in (right) then slowly turn them left until it runs a little rough. then turn back to the right a full turn. Should end up being about 3 full turns from all the way in.
Hope that helps
Reply With Quote
  #5  
Old 09-08-2010, 11:44 AM
thatsmrmastercraft's Avatar
thatsmrmastercraft thatsmrmastercraft is online now
MC Master Poster
 
Join Date: Sep 2008
Boat: 1977 Stars & Stripes
Location: St. Paul, MN
Posts: 14,889
If you are really idling that slow you would smell some raw fuel. Your idle speed should be in the neighborhood of 600 - 800 RPM at idle in gear. Need to set it in the water. On the trailer won't work.
__________________
Peter

Tandem Axle Wheel & Tire Package $659
4 S5 or S5 Black 14x5.5 wheels, 4 ST205/75R14 Kenda Loadstar tires

Single Axle Wheel & Tire Package $399
2 S5 or S5 Black 14x5.5 wheels, 2 ST205/75R14 Kenda Loadstar tires
MOUNT, BALANCE & FREE SHIPPING INCLUDED IN BOTH PACKAGES



CARB REBUILDING - FAST TURN-AROUND - $125 +PARTS
LED lights, Hubs, Spare Tire Carriers, Chrome & Powder Coated Lug Nuts - Red, Blue & Black


PM or email me tiresplease@gmail.com
Reply With Quote
  #6  
Old 09-08-2010, 01:06 PM
dlboltond dlboltond is offline
TT Regular
 
Join Date: Feb 2010
Boat: 1992 Mastercraft Maristar 210
Location: Southeast
Posts: 46
It specifically says - secondary throttle stop screw. I also found the part around mixture screws.

Thanks
Reply With Quote
  #7  
Old 09-08-2010, 01:08 PM
dlboltond dlboltond is offline
TT Regular
 
Join Date: Feb 2010
Boat: 1992 Mastercraft Maristar 210
Location: Southeast
Posts: 46
Thanks thatsmrmastercraft. That is what I was looking for. So just put it in gear and turn the idle screw on the side? Can you comment on the secondary screw?
Reply With Quote
  #8  
Old 09-08-2010, 01:59 PM
thatsmrmastercraft's Avatar
thatsmrmastercraft thatsmrmastercraft is online now
MC Master Poster
 
Join Date: Sep 2008
Boat: 1977 Stars & Stripes
Location: St. Paul, MN
Posts: 14,889
Idle speed adjustment is done by turning the idle stop screw (to use Holley's terms). The secondary throttle stop screw's function is to keep the secondary throttle plate from becoming closed to the point where it would be jammed closed.
__________________
Peter

Tandem Axle Wheel & Tire Package $659
4 S5 or S5 Black 14x5.5 wheels, 4 ST205/75R14 Kenda Loadstar tires

Single Axle Wheel & Tire Package $399
2 S5 or S5 Black 14x5.5 wheels, 2 ST205/75R14 Kenda Loadstar tires
MOUNT, BALANCE & FREE SHIPPING INCLUDED IN BOTH PACKAGES



CARB REBUILDING - FAST TURN-AROUND - $125 +PARTS
LED lights, Hubs, Spare Tire Carriers, Chrome & Powder Coated Lug Nuts - Red, Blue & Black


PM or email me tiresplease@gmail.com
Reply With Quote
  #9  
Old 09-08-2010, 02:21 PM
flipper's Avatar
flipper flipper is offline
MC Addict
 
Join Date: Mar 2005
Boat: 1991 Prostar 190, fuel injected 302
Location: Under the radar
Posts: 5,083
One a side note, make sure to run your blower good and long. Don't want to blow you boat sky high before you get it running right.
__________________
Lots of power is good, more is better, too much is just right.

'91 prostar 190
Reply With Quote
  #10  
Old 09-08-2010, 03:27 PM
dlboltond dlboltond is offline
TT Regular
 
Join Date: Feb 2010
Boat: 1992 Mastercraft Maristar 210
Location: Southeast
Posts: 46
Will do. Always run the blower. I will let you know how it works. May be a couple of days.
Reply With Quote
Reply

Tags
gas, idle, smell

Thread Tools
Display Modes

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


All times are GMT -4. The time now is 10:43 AM.