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dguidry
MMT Super Elite Member
Joined: Tue Jun 29, 2010 1:20 pm
Posts: 11166
Location: Cecilia, LA
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 New Mikuni troublsehoot BoatDr, et al:
New Mikuni carb exhibits following characteristics: after running engine a while, rpms will drop rapidly. This is not predictable enough to say there is a pattern. What do you think is going on:
1. Fuel starvation from clogged delivery system
2. Mixture too lean
3. Mixture too rich
4. water in fuel
Addendum: yes, tank is vented.
_________________
Formerly:1648 Homemade Cypress Crawfish Skiff GTR23 Performance Cam and Heads; 17x46 Gator Tail with 35GTR and Hoyt's cam;s Currently: 17x48 Gator Tail with XD40 EFI.
“Wisdom is not just expertise. It is knowing how much of various areas of expertise you need to know in order to make the decisions that the world needs and that you want to do,” Columbia University President Lee Bollinger.
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| Fri Mar 23, 2012 8:46 am |
 
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BoatDR
MMT Sponsor
Joined: Tue May 24, 2011 6:43 am
Posts: 1604
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Re: New Mikuni troublsehoot
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| Fri Mar 23, 2012 9:44 am |
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dguidry
MMT Super Elite Member
Joined: Tue Jun 29, 2010 1:20 pm
Posts: 11166
Location: Cecilia, LA
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Re: New Mikuni troublsehoot
_________________
Formerly:1648 Homemade Cypress Crawfish Skiff GTR23 Performance Cam and Heads; 17x46 Gator Tail with 35GTR and Hoyt's cam;s Currently: 17x48 Gator Tail with XD40 EFI.
“Wisdom is not just expertise. It is knowing how much of various areas of expertise you need to know in order to make the decisions that the world needs and that you want to do,” Columbia University President Lee Bollinger.
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| Fri Mar 23, 2012 10:45 am |
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dguidry
MMT Super Elite Member
Joined: Tue Jun 29, 2010 1:20 pm
Posts: 11166
Location: Cecilia, LA
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Re: New Mikuni troublsehoot Well, I just changed the fuel filter. That was it!! Engine cranks right up with no hesitation on throttle up. We'll see tomorrow in real action.
_________________
Formerly:1648 Homemade Cypress Crawfish Skiff GTR23 Performance Cam and Heads; 17x46 Gator Tail with 35GTR and Hoyt's cam;s Currently: 17x48 Gator Tail with XD40 EFI.
“Wisdom is not just expertise. It is knowing how much of various areas of expertise you need to know in order to make the decisions that the world needs and that you want to do,” Columbia University President Lee Bollinger.
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| Fri Mar 23, 2012 5:53 pm |
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Team Camo
MMT Sponsor
Joined: Thu Oct 01, 2009 4:49 pm
Posts: 8536
Location: Bridge City, TX
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Re: New Mikuni troublsehoot LIVE ACTION!!!!!!!!
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1846 GTB & 35 GTR
Team Gator-Tail
Killer Kallz & ANGLE PORT dealer
(409) 720-8949
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| Fri Mar 23, 2012 10:17 pm |
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bubba777
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Re: New Mikuni troublsehoot GOING TO HENDERSON TOMORROW??
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| Sat Mar 24, 2012 12:06 pm |
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dguidry
MMT Super Elite Member
Joined: Tue Jun 29, 2010 1:20 pm
Posts: 11166
Location: Cecilia, LA
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Re: New Mikuni troublsehoot Engine rpm dropped again today only once. It seems like the fuel flow isn't matching the engines demand. I've got an electric fuel pump. It ran just fine once I stopped and let it rest for 30 seconds.
_________________
Formerly:1648 Homemade Cypress Crawfish Skiff GTR23 Performance Cam and Heads; 17x46 Gator Tail with 35GTR and Hoyt's cam;s Currently: 17x48 Gator Tail with XD40 EFI.
“Wisdom is not just expertise. It is knowing how much of various areas of expertise you need to know in order to make the decisions that the world needs and that you want to do,” Columbia University President Lee Bollinger.
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| Sat Mar 24, 2012 7:13 pm |
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Team Camo
MMT Sponsor
Joined: Thu Oct 01, 2009 4:49 pm
Posts: 8536
Location: Bridge City, TX
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Re: New Mikuni troublsehoot 5/16 line or 1/4? Need to run 5/16 from tank to pump. Also pump might need to be stronger. You're running out of fuel.
_________________
1846 GTB & 35 GTR
Team Gator-Tail
Killer Kallz & ANGLE PORT dealer
(409) 720-8949
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| Sat Mar 24, 2012 7:44 pm |
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dguidry
MMT Super Elite Member
Joined: Tue Jun 29, 2010 1:20 pm
Posts: 11166
Location: Cecilia, LA
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Re: New Mikuni troublsehoot 5/16 all around.
Y'all don't think this behavior could have anything to do with the the air filter being so close to the exhaust manifold?
_________________
Formerly:1648 Homemade Cypress Crawfish Skiff GTR23 Performance Cam and Heads; 17x46 Gator Tail with 35GTR and Hoyt's cam;s Currently: 17x48 Gator Tail with XD40 EFI.
“Wisdom is not just expertise. It is knowing how much of various areas of expertise you need to know in order to make the decisions that the world needs and that you want to do,” Columbia University President Lee Bollinger.
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| Sat Mar 24, 2012 9:26 pm |
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ironman_gq
MMT Pro Member
Joined: Thu Oct 06, 2011 10:33 am
Posts: 100
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Re: New Mikuni troublsehoot Check and see if the float and needle are hanging up and not fully opening
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| Tue Mar 27, 2012 12:40 pm |
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centxhunter
MMT Pro Member
Joined: Fri Jan 13, 2012 1:28 pm
Posts: 357
Location: Austin, TX
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Re: New Mikuni troublsehoot You had this issue when we were running, did you ever look inside the tank to see if there is junk floating around inside. I had similar issues last summer with an old tank that had junk and even some water in the gas. We changed filters and it ran for a while until we had similar results. Poured the gas in a giant pickle jar and saw water in the bottom. That and the junk in the bottom of the tank were the culprits.
The only reason I don't think it is fuel line delivery is that you can't repeat the circumstances that make it act that way. Too random.. you had it right away, then it was fine when you switched tanks, then it came back later..
Just my .02 cents...
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1750 Gator Trax HD, MB 5000.
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| Tue Mar 27, 2012 1:28 pm |
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dguidry
MMT Super Elite Member
Joined: Tue Jun 29, 2010 1:20 pm
Posts: 11166
Location: Cecilia, LA
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Re: New Mikuni troublsehoot Could very well be junk in the tank. I know my small 3 gallon tank has a plastic fill spout floating around in it, but its not the one that was giving me trouble. I'll have to empty it some how and check for water and debris. Thanks for the suggestion.
_________________
Formerly:1648 Homemade Cypress Crawfish Skiff GTR23 Performance Cam and Heads; 17x46 Gator Tail with 35GTR and Hoyt's cam;s Currently: 17x48 Gator Tail with XD40 EFI.
“Wisdom is not just expertise. It is knowing how much of various areas of expertise you need to know in order to make the decisions that the world needs and that you want to do,” Columbia University President Lee Bollinger.
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| Tue Mar 27, 2012 1:53 pm |
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