okay so my buddy scored a really good deal on a yfz. He got it for 2G's and it only had a couple things wrong with it. He had to get a new swinger due to the one being cracked in an "x" shape just behind the shock (???). He also had to reset the toe in and take off the stock engine skid which was trashed somehow. All in all he got a good deal tho, he may need some aftermarket stuff on here such as a bumper, arms, longer axle, ect. so if any of you guys have anything f/s let me know.

So my question is simple: What were these early year yfz's notorious for, whether it be engine problems, etc....??? Also, what should he update on the quad? any necessary, cant live without parts? So far its got a full system hmf, boyesen qs2, gytr filter, nerfs (kinda shiity shape), gripper seat, powermadd handguards, and razr mx on back. Help me and my friend out and shout out any advice you all may know! Thanks!

If I remember correctly they had a oil issue to the crank that is why they did what they call a oil mod.

check out this web sight there is alot of good info.


http://yfzcentral.com/

If I remember correctly they had a oil issue to the crank that is why they did what they call a oil mod.

check out this web sight there is alot of good info.


http://yfzcentral.com/

yeah hes right. theres a mod for it though, search "oil Squirter mod" and yfzcentral youll get a ton of stuff on it!

I know this thread is like 4 months old but I have an 04 YFZ and have some things that might help if you still need it. The oil mod is really easy to do, but you have to split the cases to do it right. It is a huge help to the wrist pin as far as lubrication goes and is well worth the effort. I would also do the upper chain roller relocator, it helps prevent the roller from disentigrating. If you haven't done it yet I highly, highly reccomend the cam mod, it's the easiest power upgrade you can do on the bike and it only takes about 30 minutes to do. Lose the tps sensor system. You can buy the Sparks bypass piece or just connect the two wires together under the hood, gray two pin plug - black - black/yellow, and your in business. It will save you some headaches if the sensor or micro switch fails and the bike seems to run a little better too. There's more, I just can't think of it right now. I have really had no problems with mine that were not self induced.

maybe not with all but my buddie has 2 04's and they've had trouble keeping a charge on the battery's on both...... idk what they did but it runs good now just went though 4 or 5 battery's

I have two 04 yfzs.

If you do the 07 oil mod you don't have to split the cases.

There is no reason to disable the TPS if it is working. Doing so will make your CDI think it is running at WOT all the time. If anything you might loose a little on the bottom end because of the ignition mapping. But I am a little confused about if your actually talking about the TPS because it is three wires and it is connected at the carb. The TORS system is two wires and it connects under the hood. It is designed to cut the power if your throttle sticks. Basically it uses the switch in the throttle assy. and another switch on the carb and if they are different (one switched one not) it will cause the bike to miss etc. We run an 400ex throttle on our quad to help with the stiff throttle pull and it doesn't have the switch so we had to disable the TORS system on ours.

Some of the 04's (and even the 05s) have electrical issues with charging the battery. Our first one had to have a stator and a voltage regulator and even then if you had the lights turned off it would miss on the top end. Yamaha sold a "Resistor Kit" to fool the quads into thinking that the lights were on so the quads will charge correctly. Like I said though we just left our turned on. We also installed a larger battery with three times the cold cranking amps. With a slight mod it fits the rear plastic like it was ment to be there.

The rear swingarm on the 04's can develop an X shaped crack just above the rear shock linkage on the top of the swingarm. They actually changed them in 05 and they seem fine. We raced ours with an 05 swingarm for three seasons.

The 04's also had a plug in the cylinder head just above the exhaust that is blocking the hole that the hot start assy. was on the bikes. That plug will blow out on you and cause you to loose a lot of oil and suck some dirt etc. into your motor. 05 and up have the hole sealed from the factory.

Pretty much all the yfz's can have water pump leaking problems. On the 06 and up quads they attached a hose and it runs back to the swingarm area. Basically they didn't fix the problem they just hid the leak. It isn't a big deal to fix it and you can get all the parts (impeller shaft, 2 seals, shaft bearing) for $50 or so. Some folks will just replace the outer seal but I don't want to have to do it again if that fails because of grooves in the shaft. By the way, the two seals should have the flat spots facing each other in the middle, some quads came from the factory with the outer seal in backwards (flat side facing out) so be carefull when putting them in.

"There is no reason to disable the TPS if it is working. Doing so will make your CDI think it is running at WOT all the time. If anything you might loose a little on the bottom end because of the ignition mapping. But I am a little confused about if your actually talking about the TPS because it is three wires and it is connected at the carb. The TORS system is two wires and it connects under the hood. It is designed to cut the power if your throttle sticks. Basically it uses the switch in the throttle assy. and another switch on the carb and if they are different (one switched one not) it will cause the bike to miss etc. We run an 400ex throttle on our quad to help with the stiff throttle pull and it doesn't have the switch so we had to disable the TORS system on ours."

You are right, I was describing the TORS system and not the TPS. We had a guy in our group buy a YFZ and take it straight to Little Sahara in Oklahoma that just would not run ( the miss you described ) and that fixed that problem.

My father was a self-taught mandolin player. He was one of the best string instrument players in our town. He could not read

music, but if he heard a tune a few times, he could play it. When he was younger, he was a member of a small country music band.

They would play at local dances and on a few occasions would play for the local radio station. He often told us how he had 2)

auditioned and earned a position in a band that featured Patsy Cline as their lead singer. He told the family that after he was

hired he never went back. Dad was a very religious man. He stated that there was a lot of drinking and cursing the day of his

audition and he did not want to be around that type of environment.
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Occasionally, Dad would get out his mandolin and play for the family. We three children: Trisha, Monte and I, George Jr., would

often sing along. Songs such as the Tennessee Waltz, Harbor Lights and around Christmas time, the well-known 3)rendition of Silver

Bells. "Silver Bells, Silver Bells, its Christmas time in the city" would ring throughout the house. One of Dad's favorite 4)hymns

was "The Old Rugged Cross". We learned the words to the hymn when we were very young, and would sing it with Dad when he would

play and sing. Another song that was often shared in our house was a song that accompanied the Walt Disney series: Davey Crockett.

Dad only had to hear the song twice before he learned it well enough to play it. "Davey, Davey Crockett, King of the Wild

Frontier" was a favorite song for the family. He knew we enjoyed the song and the program and would often get out the mandolin

after the program was over. I could never get over how he could play the songs so well after only hearing them a few times. I

loved to sing, but I never learned how to play the mandolin. This is something I regret to this day.
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Dad loved to play the mandolin for his family he knew we enjoyed singing, and hearing him play. He was like that. If he could give

pleasure to others, he would, especially his family. He was always there, sacrificing his time and efforts to see that his family

had enough in their life. I had to mature into a man and have children of my own before I realized how much he had sacrificed.

I joined the United States Air Force in January of 1962. Whenever I would come home on leave, I would ask Dad to play the

mandolin. Nobody played the mandolin like my father. He could touch your soul with the tones that came out of that old mandolin.

He seemed to shine when he was playing. You could see his pride in his ability to play so well for his family.
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When Dad was younger, he worked for his father on the farm. His father was a farmer and 5)sharecropped a farm for the man who

owned the property. In 1950, our family moved from the farm. Dad had gained employment at the local 6)limestone 7)quarry. When the

quarry closed in August of 1957, he had to seek other employment. He worked for Owens Yacht Company in Dundalk, Maryland and for

Todd Steel in Point of Rocks, Maryland. While working at Todd Steel, he was involved in an accident. His job was to roll angle

iron onto a 8)conveyor so that the 9)welders farther up the production line would have it to complete their job. On this

particular day Dad got the third index finger of his left hand mashed between two pieces of steel. The doctor who operated on the

finger could not save it, and Dad ended up having the tip of the finger 10)amputated. He didn't lose enough of the finger where it

would stop him picking up anything, but it did impact his ability to play the mandolin.
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After the accident, Dad was reluctant to play the mandolin. He felt that he could not play as well as he had before the accident.

When I came home on leave and asked him to play he would make excuses for why he couldn't play. Eventually, we would 11)wear him

down and he would say "Okay, but remember, I can't hold down on the strings the way I used to" or "Since the accident to this

finger I can't play as good". For the family it didn't make any difference that Dad couldn't play as well. We were just glad that

he would play. When he played the old mandolin it would carry us back to a cheerful, happier time in our lives. "Davey, Davey

Crockett, King of the Wild Frontier", would again be heard in the little town of Bakerton, West Virginia.
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In August of 1993 my father was 12)diagnosed with 13)inoperable lung cancer. He chose not to receive 14)chemotherapy treatments so

that he could live out the rest of his life in dignity. About a week before his death, we asked Dad if he would play the mandolin

for us. He made excuses but said "okay". He knew it would probably be the last time he would play for us. He 15)tuned up the old

mandolin and played a few notes. When I looked around, there was not a dry eye in the family. We saw before us a quiet humble man

with an inner strength that comes from knowing God, and living with him in one's life. Dad would never play the mandolin for us

again. We felt at the time that he wouldn't have enough strength to play, and that makes the memory of that day even stronger. Dad

was doing something he had done all his life, giving. As sick as he was, he was still pleasing others. Dad sure could play that

Mandolin!