I have a 2006 YZ125, that has pretty much been just garage kept since bought new in 2006. I've cleaned the carb and jets and cleaned the plug. The jets were gummed up but its still cutting out high rpms or as u say the top end. an at idle, after u get to about half throttle, it starts cutting out. What else could i check or should i do? Should i go ahead and put new top end in?

SOURCE: poor acceleration at half throttle, or engine

my quad did the same....my valves(5) were way out of adjustment.I adjusted them(with a feeler gage) and now it runs pefectly

SOURCE: 2005 kx250f wont idle.will idle fine w/choke

the fact that it idles with the choke on indicates that fuel mixture is the problem here remove the mixture screw completely check that the o ring seal is not damaged & that the end of the needle is not worn or bent if either of these conditions are obviouse replace the damaged or worn parts general rule of thumb with mixture adjustment is 1&1/2 to 2 turns out give it a try

SOURCE: won't idle without choke, turn throttle boggs out

have u checked the float hight on the carburator? also make sure ur choke curcuit i clean and free of dirt

David Belcher

• 1978 Answers
• Posted on Jul 16, 2010

SOURCE: i think my carb is gummed up or the jets are

The only way to properly clean is to remove and disassemble. However if you are just a victim of bad gas, a shot of carb cleaner down the fuel line will remove fuel that has gelled in the jet. Know if the clog is more serious, drain the carb bowl, and fuel tank. Pour some Chevron "TECRON" directly into the carb, mix a Shock Treatment ( about a third of cup in one gallon of gas)and put in tank. Start the bike just enough to **** into jets, and let sit overnight.Drain the carb bowls and restart the bike. let it idle or drive it slowly for five minutes. this will usually take care of minor clogs.When bike is idling or running better drive to gas station and fill the tank. Drive the shock treatment through the bike(100 plus miles), this should clean up the entire engine. If the techron does not clean the carbs in 5 to 10 minutes of running time, you will have to take them apart to clean them properly. Use Chevron "Techron" not Chevron "Fuel sytem cleaner with Techron". Techron is more concentrated.

SOURCE: Hi , my suzuki Bandit GSF 600 2002 plate, off road

Ride the bike 20 or so miles on open road. Stop and remove plug to inspect. 'Are they black or white ?


Black =rich white=lean