The Yamaha YZ125 is a motocrossracing motorcycle with a two-stroke 124.9 cc (7.62 cu in) displacementsingle-cylinder engine made by Yamaha since 1974. It is available to the public. For the first two years it was made with dual rear shocks, then changing to a monoshock. The YZ125 has been ridden to five AMA National Motocross Championships, and multiple AMA Regional Supercross Championships.
In 2001, Yamaha released a bike designed to complement the YZ125, the four-stroke YZ250F. The two bikes shared a rolling chassis and are eligible to compete in the same racing class. The YZ250F has a slight horsepower advantage.
The YZ125 has a 124 cc (7.6 cu in) reed valve-inductedtwo-stroke engine. It was air cooled from 1974 to 1980, and liquid cooled since 1981. It has a Mikuni 38 mm TMX series carburetor. The engine produces 35 hp (26 kW).
The YZ125 has been built with five- or six-speed manual sequential gearbox depending on model year. The 2005 model has a constant-mesh, wet, multiple-disc coil-spring clutch.
From 1973 through 2004, the YZ125 had a single backbone frame made from steel. It generally averaged from 176 to 198 lb (80 to 90 kg). For the 2005 year, Yamaha switched to a single backbone frame constructed from an aluminum alloy. This frame material change dropped the dry weight to 190 lb (86 kg). For 2008 models, the wheel assemblies and front fork suspension were redesigned, yielding additional weight savings, making wet weight, no gas sub-200 lb. Aluminum-framed YZ125s are notably "flickable" and sometimes this trait is seen as a drawback since they tend to become more difficult to control on rough surfaces. The YZ125 used a conventional telescopic fork tube through 1988, then in 1989, added the first upside-down fork. A very well knows the amount of riders have chosen this as their go-to bike, such as AMA Champ Dom Barbuto and his brother Nick Barbuto, and X-Games medalist Kyle Ford. Also, 11-time Nationals winner and rival of Eli Tomac, Richard Rich
Originally Posted by arnego2
How do you do the setting up, changing several things at once or do one at the time?
---------- Post added at 07:13 PM ---------- Previous post was at 06:57 PM ----------
Originally Posted by Randog Leader
You should start with the basics before trying to do any jetting changes. Common mechanical issues that mimic poor jetting:
Already repacked silencer...
Replaced all seals during rebuild and recently rechecked by pressurizing the crankcase vent and held pressure good....
Have checked ignition resistance at the various locations and seem to be in spec per book....
New plugs and brand new plug boot...
Installed a slightly fatter needle to make up for any wear in bore.
New Vforce reed assembly...
Compression around 145 PSI after several kicks...
power valve linkage moving well....can't verify actual valve movement.
It could be lean on the pilot, but plug always seems to be wet when I check it. thats why I keep trying to lean it out. When I found the carb it was set up like a 1999 with a 50 pilot and 350 main. Have not gone back to that setting since seems to be wet all the time. Currently running a 30 and 350. But may need to try the 40 or 50 again. It has been a battle the whole way and seems I have gotten nowhere. Bog after bog after bog!!!
Sergei honestly stared at the shoes, not trying, however, to figure out which. Looks better. He just tried to guess what she had already chosen from this.
Carb size yz125
These words sounded like a threat. I did not expect such audacity from some religious nonsense. Silence reigned outside the door. Did he believe it.Lectron Carburator Test on a YZ125
The guys smelled of alcohol, but they didn't seem to be very drunk. They seemed to me about my peers at the age of 18-20. I foolishly tried to call for help and received a strong blow in the stomach.
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On the plane. My classmates at the academy sit in the tourism class, and I fly above the clouds. I want both cocks, I tell them to get up and.