'80 LF Carb help and Fuel Pump Issue
'80 LF Carb help and Fuel Pump Issue
Rookie here again. Finally figuring out my 2 '78' LF 440's and so now I'm on to this '80 LF 440 I acquired and another '81 LF 440 parts sled as well.
Sat for 3 years, good spark and compression. Ran good on idle, put it under load and gave throttle it would die every time.
Took carbs off and cleaned them, all kinds of crud and junk came out. Replaced both of the tiny O-rings going into bottom of carb bowl.
Now I can't get it to fire. Dry plugs. Took line off from tank to pump, def. have gas there. Took both lines off pump going to the 2 carbs, no gas coming out when I turn it over? Bad pump all of a sudden? I know there are couple rubber diaphrams in there...a hole...maybe some ice or water? The vaccuum line from pump to engine is intact and looked pretty good.
Sat for 3 years, good spark and compression. Ran good on idle, put it under load and gave throttle it would die every time.
Took carbs off and cleaned them, all kinds of crud and junk came out. Replaced both of the tiny O-rings going into bottom of carb bowl.
Now I can't get it to fire. Dry plugs. Took line off from tank to pump, def. have gas there. Took both lines off pump going to the 2 carbs, no gas coming out when I turn it over? Bad pump all of a sudden? I know there are couple rubber diaphrams in there...a hole...maybe some ice or water? The vaccuum line from pump to engine is intact and looked pretty good.
'78 440 Liquifire - (2)
'80 440 Liquifire
'81 440 Liquifire
'80 440 Liquifire
'81 440 Liquifire
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Re: '80 LF Carb help and Fuel Pump Issue
It's possible. For me, the fuel pump is the first thing to rebuild or replace when working on a sled. Especially since it's so cheap.
Matt - JDsleds.com Administrator
Re: '80 LF Carb help and Fuel Pump Issue
Is a new pump pretty inexpensive? What about rebuild kit?
'78 440 Liquifire - (2)
'80 440 Liquifire
'81 440 Liquifire
'80 440 Liquifire
'81 440 Liquifire
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- Posts: 4747
- Joined: Wed Jul 13, 2005 12:00 am
- Real Name: Matt
- Location: Coopersburg, PA
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Re: '80 LF Carb help and Fuel Pump Issue
Matt - JDsleds.com Administrator
Re: '80 LF Carb help and Fuel Pump Issue
In regards to this '80 and '81 I'm working on, what else do I need to know about getting them in order for first pull starting and running?
'78 440 Liquifire - (2)
'80 440 Liquifire
'81 440 Liquifire
'80 440 Liquifire
'81 440 Liquifire
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- Posts: 2965
- Joined: Thu Jul 14, 2005 12:00 am
- Real Name: Pat Scott
- Location: Southeast Pa.
Re: '80 LF Carb help and Fuel Pump Issue
new crank seals if unknown replacement
check compression, looking for at least 100 psi per cylinder and now more than 10 lbs difference
check clutches
check over drive train, drain chain case, remove cover, inspect, add new oil
check all bearings on jackshaft and driveshaft
check suspension
check compression, looking for at least 100 psi per cylinder and now more than 10 lbs difference
check clutches
check over drive train, drain chain case, remove cover, inspect, add new oil
check all bearings on jackshaft and driveshaft
check suspension
'76 440 cyclone
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
Re: '80 LF Carb help and Fuel Pump Issue
Anybody familiar with the NOS Mikuni DF52 Fuel Pumps '80 + LF's ? Recieved one today for my '80 LF 440 and the bolt holes are in the middle of the pump, at least an inch higher in the air than what this factory one looks like I have now. Worried with the raised height of the pump now, is still enough clearance for the right side carb?
'78 440 Liquifire - (2)
'80 440 Liquifire
'81 440 Liquifire
'80 440 Liquifire
'81 440 Liquifire
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- Posts: 1450
- Joined: Sat Jan 30, 2010 10:54 am
- Real Name: Pat
- Location: N. IL
Re: '80 LF Carb help and Fuel Pump Issue
The OEM LF pump can be a problem given the close quarters in the engine bay. Is this pump taller than that? The dual outlet pumps available now can be used on an LF but need to be shimmed because the attaching ears are not on the bottom of the casting. I bought a sled that had one on the airbox, so I moved it and sealed the holes.
- nick80lf
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Re: '80 LF Carb help and Fuel Pump Issue
DF52-73 will bolt right in
http://www.mikuni.com/c-fuel_pumps.html
Sent from my Motorola RAZR MAXX using Tapatalk
http://www.mikuni.com/c-fuel_pumps.html
Sent from my Motorola RAZR MAXX using Tapatalk
80 Liquifire (purchased 1996 ~ Running)
80 Liquifire (purchased 2010 ~ Running....Now)
80 Liquifire (purchased 2011 ~ Not running - I officially have a problem now)
83 Snowfire (purchased 2014 father/son restoration project)
78 Spitfire ~ sold (should have been shot for this)
80 Liquifire (purchased 2010 ~ Running....Now)
80 Liquifire (purchased 2011 ~ Not running - I officially have a problem now)
83 Snowfire (purchased 2014 father/son restoration project)
78 Spitfire ~ sold (should have been shot for this)
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- Posts: 2965
- Joined: Thu Jul 14, 2005 12:00 am
- Real Name: Pat Scott
- Location: Southeast Pa.
Re: '80 LF Carb help and Fuel Pump Issue
X2nick80lf wrote:DF52-73 will bolt right in
http://www.mikuni.com/c-fuel_pumps.html
Sent from my Motorola RAZR MAXX using Tapatalk
'76 440 cyclone
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
-
- Posts: 1450
- Joined: Sat Jan 30, 2010 10:54 am
- Real Name: Pat
- Location: N. IL
Re: '80 LF Carb help and Fuel Pump Issue
The spare I have here is the DF 53-21-D. It does not bolt in easily because the ports aren't oriented properly for the LF. I assume it's why the previous owner bolted it to the airbox.
Re: '80 LF Carb help and Fuel Pump Issue
Can you pull the six screws and rotate the plate so it points in the correct direction?
Todd Schrupp
Milbank SD
Milbank SD