2004 YZ125 hinson clutch and high rpm power problems

[tonea002]

I just picked up a 2004 YZ125. I picked it up for 500 cause it needed a top end and had been sitting for a few months. I sent the head out to get re-plated and got a new piston and bearings. I put everything back together last night and it started on the second kick. Problems:

The clutch will not disengage all the way. I have tried moving the rod 2 teeth one direction and 2 teeth the other direction. Still can not get it right. I have tired adjusting the clutch on the handlebar as I moved it from tooth to tooth. Still nothing. When i took the clutch cover off everything looked ok and it had all hinson parts inside. so that is where i sit confused right now.

Second Problem is that i broke it in for about 30-45 mins and everything was fine and i cracked the throttle one good time and it would not hit the powerband. It almost sounds like it is to lean or something. I am not quite sure. I tried putting a plug in it and nothing changed. When i sit in the shop i can rev the bike and it sounds ok until i hit the higher rpm's and it sounds like it is almost bogging...(kind of) So i think it is jetting or gummed up carb or something. What do yall think?

please help i am trying to have a little fun here soon before i have to sell it. Thanks everyone in advance

[MXtras]

Bogging is usually an indication of overly rich condition but being a descriptive term - you might not be using it in the normally accepted context.

If it is too lean, the bike will sound like it's hitting a rev limiter.

If it is too rich, it will have a really rich, throaty sounds usually accompanied by a bunch of smoke, usually followed by a fouled plug.

Several things could be at odds here. How did you re-establish the ignition timing when you put it back together? (I might be mis-understanding you here - at first read I thought you may have put new bearings in the crank, If not, then disregard.......)

Reading the plug won't help unless the bike is running under a load. If it IS running lean, you do NOT want to run it under a load. Too lean means not enough fuel which means not enough lubrication. Not good.

Seeing as how we are neighbors (I am in P-town, nearly chesapeake) it wouldn't be too much for me to come over and take a peek if you are interested.

Give me a call if you would like me to take a look. I think I could help you out.

(757) 714 - 0620

Scott

[MXtras]

Well - I ended up going over and looking this guys bike over.

First of all - he got a killer deal on this bike. It needs some TLC, but it is in very, very good condition.

The problem with his engine was that there was a mouse nest in his pipe! No kidding. Never run acrosss that before. When he first fired it up, it sounded as if there was an exhaust plug in the silencer, but there was not. With the suggestion from his Dad, we pulled the silencer and you could see packed grass poking out and you could only poke a screwdriver in about three inches before hitting a relatively solid obstruction. We pulled the pipe, evicted the deceased critter and condemned his home. We hit the pipe with a torch and incinerated the contents, then blew it out with compressed air.

We removed his carb to check the jetting and to make sure we had a clean start. His pilot jet had a small piece of something in it, so he cleaned it all up, checked the float height and put it all back together.

Next was the clutch. I looked at all the basics and everything looked good, so I layed the bike over and pulled the clutch cover. The slider plates had rusted to the friction plates. At some point in the past, the oil was contaminated with water - either from waterpump seal failure or a dunk in the drink and the bike sat with this contamination in the tranny, rusting the plates together. Who knows if there is other damage. We pulled everything out, cleaned all of the plates and slapped it back together.

I then helped him rough in his suspension and set him up with some decent instruction and settings that should get him going fairly well.

The bike is now good to go. Runs great, shifts fine, the clutch works smoothly and the OP is happy. On top of all that, I met some great folks.

Life is good!

Scott

[bitshifter]

Scott, You Da Man! I need a neighbor like you, nice job.

[cetanepusher]

Thats really cool providing the help... Way cool dude. Props to you.

[Ford]

Scott nice job dude!....you have helped many around here, including me!

Cheers bud!