One of my 1980 liquifires was running very strong, I parked it for a couple of days inside. When i went to start it, it started harder than normal and when I pulled it out of the shop it boged quite bad and quit. I got it running again, but while pulling and then while running it would backfire and puff out the exhaust and had no power at all. It has good compression on both sides, I tested the spark with an inline spark tester, and it seemed good on both sides. could it be the CDI box or maybe the timing or crank seal??
Does anyone have any suggestions where to start? Thank you guys I do love this site, and thank everyone who responds to the forum.
Backfire on 80 liquifire.
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sledchad
Backfire on 80 liquifire.
What do your plugs look like after it kills? First thing i would do is try a different set of plugs, BR9ES-NGK. If that doesnt cure it then spray carb cleaner on the crank seals and carb holders, jugs and see if the rpm goes up. Try that first and let us know.
MARK-
grasscutter97
- Posts: 164
- Joined: Tue Oct 18, 2005 12:00 am
- Location: Omaha, NE 68103
Backfire on 80 liquifire.
Dirty carbs will cause your bog and backfire. Don't forget..."don't move the sled until the temp gauge moves".
Backfire on 80 liquifire.
Grasscutter You have to let it warm up that long. I just start and go I might give it 30sec or so. BOB
BOB From MASS
OWN: 1 1983 JOHN DEERE LIQUIFIRE 440
1 1973 JOHN DEERE JDX8 440
1 1982 JOHN DEERE SPORTFIRE 440
1 2000 SKIDOO MXZ 600
GOTTA LOVE THAT TWO STROKE SMELL
OWN: 1 1983 JOHN DEERE LIQUIFIRE 440
1 1973 JOHN DEERE JDX8 440
1 1982 JOHN DEERE SPORTFIRE 440
1 2000 SKIDOO MXZ 600
GOTTA LOVE THAT TWO STROKE SMELL
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WatertownBob
- Posts: 110
- Joined: Wed Oct 04, 2006 12:00 am
Backfire on 80 liquifire.
I drive it slow the first half mile or so. What is the proper procedure for engine warm up?
Bob
Bob
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jddecalguy
- Posts: 249
- Joined: Tue Nov 01, 2005 12:00 am
- Location: minnesota
- Contact:
Backfire on 80 liquifire.
i would say that you have a sticky needle in the carb or a bad needle and seat and it filled the crankcase full of gas.
chris
jddecalguy
chris
jddecalguy
Backfire on 80 liquifire.
Hello guys, thank you for all of the replies. I still havn't figured out for surre what is wrong, I am waiting for a new coil and cdi to arrive. What should a person do when you flood the crankcase, gan you blow much of it out with compressed air or what should I do to remove the excess fuel?
Thanks again
Thanks again
Backfire on 80 liquifire.
Nothing you have to run it. I had the same problem untill i put in a shutoff valve. You might want to think about doing that it will help. Nice Collection. BOB
BOB From MASS
OWN: 1 1983 JOHN DEERE LIQUIFIRE 440
1 1973 JOHN DEERE JDX8 440
1 1982 JOHN DEERE SPORTFIRE 440
1 2000 SKIDOO MXZ 600
GOTTA LOVE THAT TWO STROKE SMELL
OWN: 1 1983 JOHN DEERE LIQUIFIRE 440
1 1973 JOHN DEERE JDX8 440
1 1982 JOHN DEERE SPORTFIRE 440
1 2000 SKIDOO MXZ 600
GOTTA LOVE THAT TWO STROKE SMELL
Backfire on 80 liquifire.
I had a chance to replace the CDI and it runs great again. thanks to all for the help.
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ICCSF 108
- Posts: 4369
- Joined: Sun Jul 17, 2005 12:00 am
- Real Name: Kenny Heins, AKA Grumpy
- Location: Blue Springs Mo.
- Contact:
Backfire on 80 liquifire.
If you store the sleds with the backend up or carry them in a pickup with the backend up fuel shutoffs need to be installed This will take care of the problem.
To be the fuel out of the crank case when its full of gas pull the sled outside pull both plugs out MAKE SURE the IGN is OFF & pull the motor over untill the gas doesn't come out of the sparkplug holes any more, reinstall new plugs & start motor. Repeat as necessary.
Ken
To be the fuel out of the crank case when its full of gas pull the sled outside pull both plugs out MAKE SURE the IGN is OFF & pull the motor over untill the gas doesn't come out of the sparkplug holes any more, reinstall new plugs & start motor. Repeat as necessary.
Ken
AKA: Kenny, Grumpy, Mr. Richard Head
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
"God I love the smell of KLOTZ in the morning, That smell, you know that Gasoline/Oil Smell, MAKES the whole place SMELL like.. LIKE VICTORY. You know someday the 2 strokers are gonna end..."
Do Anti-War Protesters have reunions? If so what do they TALK about?
"I Hunt For it, Purchase it, Haul it, Sometimes Repair it, Sometimes Break it, Then Fix it Again, Label it, Warehouse it, Talk About it, So NOW, HOW Can I Take Any Less $$ For It?"
"God I love the smell of KLOTZ in the morning, That smell, you know that Gasoline/Oil Smell, MAKES the whole place SMELL like.. LIKE VICTORY. You know someday the 2 strokers are gonna end..."
Do Anti-War Protesters have reunions? If so what do they TALK about?
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Spitfire79
- Posts: 208
- Joined: Wed Dec 28, 2005 1:00 am
- Location: Lockport, MB.
Backfire on 80 liquifire.
Hey Pion
Whre did ou find a DI?
Mine runs fine for a few minutes, then runs terrible. No power. Both plugs seem to fire. It will rev to 4000 but has a hard tim getting over this. Then asuddenly it runs decent. I was thinking my plug coil is bad. How can I test the CDI
Jeff
Whre did ou find a DI?
Mine runs fine for a few minutes, then runs terrible. No power. Both plugs seem to fire. It will rev to 4000 but has a hard tim getting over this. Then asuddenly it runs decent. I was thinking my plug coil is bad. How can I test the CDI
Jeff
Lockport, MB.
1979 Spitfires ( 2 ), 1980 Liquifires ( 2 ), 1999 A/C ZR 440 SnoPro, 1996 A/C ZRT600, 1929 Graham Paige 612
Gotta love a 2 stroke !
1979 Spitfires ( 2 ), 1980 Liquifires ( 2 ), 1999 A/C ZR 440 SnoPro, 1996 A/C ZRT600, 1929 Graham Paige 612
Gotta love a 2 stroke !
Backfire on 80 liquifire.
I am not sure how you test a CDI, I had read a posting from a while back on how to rebuild a coil but it seemed a bit over my head, I have three sleds, so I took a CDI off of the one that was running and switched it. The machine ran quite well so I ordered a new CDI to replace the swaped one. I ordered it from Agri sports out of Regina, they are very good to deal with, the CDI was $99.00cdn and a new coil is $ 49.00cdn. Hope it helps.