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View Full Version : yt125 tri moto wont rev up all the way


yamaha125trimoto
03-29-2003, 09:46 PM
when you give it half throttle it starts to cut out but wont die if you hold it full throttle anyone know why ???
Honda's_Better
03-29-2003, 11:57 PM
have you tried a new spark plug??
Yamaha_Rules69
03-30-2003, 12:03 AM
A new spark plug heals all. Honda's_Better and I know from past experience.
HemiChallenger71
03-30-2003, 01:45 AM
Why dont you clean out the carb and clean the the fuel shut off bowl. I would suggest replacing the fuel lines with a filter also.
84250r
03-30-2003, 02:10 AM
Why dont you clean out the carb and clean the the fuel shut off bowl

I would try that first. Then move to your air filter and clean it.
YamaChuck
03-30-2003, 12:13 PM
Your exhaust also has a spark arrestor in it. You should make sure that it's not clogged up. My experience with these 125's is that they tend to clog up with carbon. I would make sure that the exhaust can breath well. When I rebuilt mine I found that the exhaust port on the head was 3/4 clogged with carbon. Bottom line is that there are many possible causes for a poor running engine. Eliminate them, one by one, and you should be able to iron out the bugs. Oh, and by a service manual. They are invaluable.
yamaha125trimoto
03-30-2003, 04:54 PM
my exaust is clean could it need reeds ???
cuz i havent replaced them ever
balelorf
03-31-2003, 11:13 AM
The only time I've seen a bike do this was on my friends CR, he had a frozen ring so it wasn't making full compression and any attempt to give it a lot of gas just made the thing cut out like mad.