got a 2000 lt80 for my son and am having problems keeping it running. cleaned carb thoroughly, put it back together and he road it for 45 min or so ran great. tried to start it after 15 min break or so and turned over but would not start. checked plus and all good there. took off carb cleaned and same prob. bought rebuild kit for carb put back together started ran great next day turns over but no start. cleaned carb again replaced fuel lines still no start. it gets spark and will turn over all day but cant get it to fire. im at a loss any ideas at all. the only parts on this that aren't stock are a trinity pipe and a wiseco piston stock bore though. i cant figure out why it will run so good then nothing
thanks for the help

 

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Is it getting spark and gas (wet plug)?

Running till hot then not usually points to a CDI.
Lemme know.

 

its getting spark plug looks great light brown but is dry. would it be the cdi even if it wont start after it cools

 

one other question anyone know what the black rubber boot that fits on the main and pilot jet housing is for. seems as if that might be keeping fuel from the jets.
thanks for you help

 

Maybe gas delivery prob? IE: running out? Dies when carb bowl empty's out? Take off carb boot, spray 2 "minor" shots of gas "using trigger sprayer"..See if it will start... If so maybe petcock prob, or float is stuck in up position shutting off flow?

Rude Dog
(TT LT80 4 sale PM me)

 

ok squirted some gas in there started and sputtered and quit. i checked the petcock and its clean and has good flow, float seems to be working ok atleast it has good movement when carb is opened up. this has me really baffled.

 

This process should only be done right after you ride it (when it has quit). Get another person to help. Have them work the starter controls. "You" squirt the gas consistently. See if it will stay running. If so, fuel starvaion may be the problem..

Rude Dog

P.S. The original petcock is vacuum so it won't flow unless the engine is cranking or running...

 

<div class="FTQUOTE"><begin quote>Originally posted by: Rudedog


P.S. The original petcock is vacuum so it won't flow unless the engine is cranking or running...</end quote></div>

unless its cloged or broke. if its clogedit will not pump gas or if the diphram has a hole in it it wont pump gas. turn to prime and its on all the time no vacuum needed.

 

The black thing in the carb has been known to "change position" and get bent over which indeed shuts off a jet.
You can leave that out w/o problem.

Might as well check the reed while the carb is off.

 

ok thanks for the suggestions ill try squirting gas in while continually cranking, and i didnt mention it before but it does have an aftermarket petcock so no vacuum or prime just on and off. ill check out the reed to that is one thing i havnt looked at yet