ATV Florida Forum

I have a Suzuki LT80 that has a bogging problem. Runs fine except when you first hit the throttle it bogs down allot and then finally takes off. Seems to run fine otherwise but not as fast as the other one we have. Cleaned the carb and found nothing still runs the same. Unbolted the exhaust and still runs the sam. Checked the reeds and appear to be good. Next thing that I can think of is worn rings. Anyone know what the compression is suppose to be for this thing? Any help would be greatly appreciated.

needs to be jetted/tuned. i would start by adjusting the air/fuel screw. it needs to be between 1/2-2 and 1/2 turns out. more out means your pilot jet is to rich, more in means your pilot jet is to lean. turn it until it idles good and has a snappy response. if it is too far out or too far in to achieve this, then change the pilot jet. sounds to me like its a got a rich condition down low so try turning the air fuel screw in a bit and see what happens, you will need to compensate with the idles screw as this will change your idle speed.

if the moter is all stock on stock jetting and it just started running bad than just remember this. if you have no compression or have bad spark than it will always act like the jetting is off no matter how hard you try to tune it... if it is all stock with a clean stock jetted carb then id run a compression check if you think its really truly running that bad. sounds to me like its no big deal tho... also i really doubt it but if its a points/condensers ignition than that right there is your problem, get new points and condensers... its more than likely cdi unless its a late 70s quad lol so i wouldn't worry about that.

... this is a 2 stroke right?

Is the air filter clean? Did you try a new plug?

It is a 2 Stroke and there is no air fuel mixture screw on this carb. The air filter is clean and spark plug has been changed. I even swaped the carb & reeds from the bike that is runing perfect and no difference. This bike is definetly under powered compared to the other one.  Ran a compression check and it is around 130 to 140. I am not sure what the spec's are for this bike so don't know maybe its time for new rings or not.

isnt there an exhaust plug or something on these? I know if its in its alot tamer. I plan on picking one up friday for my daughter

Check the compression on the good one and compare.

Funny you mention that I just did and it is around 170 to 180. Not much of a difference but definetly a not the same.

well, if i were you id go ahead and throw some new piston rings on it, they are very easy to install and they are real cheep to. you will have to go through the break in process again after you change them tho. on my 50cc moped it used to run like garbage too the point were it wouldn't run an more becasue the piston rings were originals from 1982 and its ben swamped 100 times. i shanged the rings and it ran like new again.

since the bike was a stock running bike not something you just built or anything, then obviously its not jetting or anything, something has failed, and id say that'd be the piston rings...

did you get it?

there are several things to check befor you tear into the engine.  suzuki put restrictors in the exhaust and in the carb on these machines to slow them down.  one was in the exhaust it goes in the pipe where it bolts to the head its a reducer or washer to restrict the exhaust flow thus restricting the engine output power. second is a throttle restrictor its a brass ring in the carb it stops the slide from opening all the way.  i have two LT80 that my kids ride one of them had a problem bogging on accel and it was a bad fuel valve/pump on that machine they use a pump in the fuel valve to control fuel supply and are known to have problems.

steve
727-432-0270
if you cant get it call me i will help you get it running