'80 LF Carb help and Fuel Pump Issue

Technical topics related to machines powered by Kasasaki motors
Post Reply
Andrew27
Posts: 22
Joined: Fri Feb 18, 2011 12:13 am
Location: Indiana

'80 LF Carb help and Fuel Pump Issue

Post by Andrew27 »

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.
'78 440 Liquifire - (2)
'80 440 Liquifire
'81 440 Liquifire
Matt
Posts: 4747
Joined: Wed Jul 13, 2005 12:00 am
Real Name: Matt
Location: Coopersburg, PA
Contact:

Re: '80 LF Carb help and Fuel Pump Issue

Post by Matt »

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.
:usa: Matt - JDsleds.com Administrator
Andrew27
Posts: 22
Joined: Fri Feb 18, 2011 12:13 am
Location: Indiana

Re: '80 LF Carb help and Fuel Pump Issue

Post by Andrew27 »

Is a new pump pretty inexpensive? What about rebuild kit?
'78 440 Liquifire - (2)
'80 440 Liquifire
'81 440 Liquifire
Matt
Posts: 4747
Joined: Wed Jul 13, 2005 12:00 am
Real Name: Matt
Location: Coopersburg, PA
Contact:

Re: '80 LF Carb help and Fuel Pump Issue

Post by Matt »

:usa: Matt - JDsleds.com Administrator
Andrew27
Posts: 22
Joined: Fri Feb 18, 2011 12:13 am
Location: Indiana

Re: '80 LF Carb help and Fuel Pump Issue

Post by Andrew27 »

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
harleysportster
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

Post by harleysportster »

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
'76 440 cyclone
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
Andrew27
Posts: 22
Joined: Fri Feb 18, 2011 12:13 am
Location: Indiana

Re: '80 LF Carb help and Fuel Pump Issue

Post by Andrew27 »

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
AirborneX4Special
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

Post by AirborneX4Special »

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.
User avatar
nick80lf
Posts: 1160
Joined: Thu Jan 14, 2010 10:45 pm
Real Name: Nick
Location: The snow free zone of Ohio

Re: '80 LF Carb help and Fuel Pump Issue

Post by nick80lf »

DF52-73 will bolt right in

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)
harleysportster
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

Post by harleysportster »

nick80lf wrote:DF52-73 will bolt right in

http://www.mikuni.com/c-fuel_pumps.html

Sent from my Motorola RAZR MAXX using Tapatalk
X2
'76 440 cyclone
'76 440 liquifire
'78 440 Cyclone
'75 JDX8 (sold to a member here)
'78 Liquifire(CrossCountry Clone)
'80 Liquifire(sold)
AirborneX4Special
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

Post by AirborneX4Special »

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.
JDT
Posts: 5561
Joined: Wed Nov 21, 2007 1:00 am
Real Name: Todd
Location: Milbank South Dakota

Re: '80 LF Carb help and Fuel Pump Issue

Post by JDT »

Can you pull the six screws and rotate the plate so it points in the correct direction?
Todd Schrupp

Milbank SD
Post Reply