LT 80 dying after 5/10 mins

Rion · 01-11-2012, 05:20 PM

Iv recently bought a Lt 80, been stood a year. Had a bit of a play with getting it started the other day. Had to by pass the starter relay and after a bit it fired up. Took it up the street and it was spluttering. Bought a new plug and relay in today, put them in and it started first time. Took it out and it would only run on the choke, smokes loads, then started to die when you put full revs on after 10 minutes or so. Now it just dies when you rev it. Ticks over fine, without choke. It was running mint for 10 mins after new plug n relay fitted. Iv not yet had the carb off. Was just wondering if anyone had experienced this and could offer some help.

Cheers Ri.

zookie400 · 01-11-2012, 06:54 PM

take the carb apart and clean it, and cleaning it means using an appropriate tool to clear all orifices and passageways. spraying carb cleaner will do nothing but get dust off the outside. torch tip files or carb drills work fantastic. you dont want to use a tool that is bigger than the hole you are cleaning, you will throw off the jetting if you ream anything larger.

make sure you have proper flow coming from the petcock/fuel line. also make sure the vent on the gas cap is able to let air into the tank.

timgoob · 01-11-2012, 07:08 PM

i had one of those a while back for my son . carb gave me fits for a while. would starve for fuel turned out to be one of the tiny carb vent hoses. i guess what i'm saying is make sure there clean also.

Rion · 01-12-2012, 04:12 AM

Cheers guys, will pull the carb off later today and update you on my progress.

liquidlouie · 01-12-2012, 10:02 AM

Also check the carburetor insulator (between the carb and the reed cage). These have a tendency to develop cracks, and allow additional air into the reed cage, causing the need to run with the choke on as you have mentioned.

Rion · 01-13-2012, 10:19 AM

Right. Cleaned all the carb out. Jets ect all clear. Seal between the carb/engine looks ok. Now it's running worse. Soon as I rev it it dies and splutters like mad and won't even pull me. Ticks over mint. It's like it's flooding or choking. It's really p***ing me off ha ha

amcf18 · 01-26-2012, 10:23 AM

Did you drain the the tank and start with fresh fuel?

algonz · 01-26-2012, 10:43 AM

Replace the pilot jet !!!!!!!

01-11-2012, 05:20 PM	#1 (permalink)
Rion :::Rookie Rider::: Join Date: Jan 2012 Posts: 3	LT 80 dying after 5/10 mins Iv recently bought a Lt 80, been stood a year. Had a bit of a play with getting it started the other day. Had to by pass the starter relay and after a bit it fired up. Took it up the street and it was spluttering. Bought a new plug and relay in today, put them in and it started first time. Took it out and it would only run on the choke, smokes loads, then started to die when you put full revs on after 10 minutes or so. Now it just dies when you rev it. Ticks over fine, without choke. It was running mint for 10 mins after new plug n relay fitted. Iv not yet had the carb off. Was just wondering if anyone had experienced this and could offer some help. Cheers Ri.

01-11-2012, 06:54 PM	#2 (permalink)
zookie400 :::Post Whore::: Join Date: Aug 2007 Location: Connecticut Posts: 2,685	take the carb apart and clean it, and cleaning it means using an appropriate tool to clear all orifices and passageways. spraying carb cleaner will do nothing but get dust off the outside. torch tip files or carb drills work fantastic. you dont want to use a tool that is bigger than the hole you are cleaning, you will throw off the jetting if you ream anything larger. make sure you have proper flow coming from the petcock/fuel line. also make sure the vent on the gas cap is able to let air into the tank.

01-11-2012, 07:08 PM	#3 (permalink)
timgoob :::Mini LT80 Rider::: Join Date: May 2004 Posts: 223	i had one of those a while back for my son . carb gave me fits for a while. would starve for fuel turned out to be one of the tiny carb vent hoses. i guess what i'm saying is make sure there clean also.

01-12-2012, 04:12 AM	#4 (permalink)
Rion :::Rookie Rider::: Join Date: Jan 2012 Posts: 3	Cheers guys, will pull the carb off later today and update you on my progress.

01-12-2012, 10:02 AM	#5 (permalink)
liquidlouie :::Rookie Rider::: Join Date: Feb 2011 Location: Greenville, WI Posts: 41	Also check the carburetor insulator (between the carb and the reed cage). These have a tendency to develop cracks, and allow additional air into the reed cage, causing the need to run with the choke on as you have mentioned.

01-13-2012, 10:19 AM	#6 (permalink)
Rion :::Rookie Rider::: Join Date: Jan 2012 Posts: 3	Right. Cleaned all the carb out. Jets ect all clear. Seal between the carb/engine looks ok. Now it's running worse. Soon as I rev it it dies and splutters like mad and won't even pull me. Ticks over mint. It's like it's flooding or choking. It's really p***ing me off ha ha

01-26-2012, 10:23 AM	#7 (permalink)
amcf18 :::Ozark 250 rider::: Join Date: Apr 2010 Location: Quartzsite Az,/ Picton, On Posts: 281	Did you drain the the tank and start with fresh fuel?

01-26-2012, 10:43 AM	#8 (permalink)
algonz :::Rookie Rider::: Join Date: Jan 2012 Posts: 2	Replace the pilot jet !!!!!!!

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