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A few questions... YZ125

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Hello all,

 

I bought a 1997 YZ125 about 45 days ago. I usually ride 1 - 2 times per week. I ride it at a MX facility but I don't ride the pro track. I usually keep it on the hare scramble track or some of the open riding areas. I only go WOT on long straights and I'm still learning how to "keep on the pipe". 

 

1. When I first start the bike and rev the engine I can hear air escaping from kick start screw. It sounds almost like a turbo on a car. psssssssssss. Is this a normal place for air to escape? The air is coming out where the kick starter screws into the engine. It looks like there is a bolt and a rubber seal there. Maybe I should replace this seal??? 

 

2. My spark plug is a little on the dark side of chocolaty brown. Like dark chocolate. I am running a 330 main/45 pilot. The previous owner was running a 310 main/50 pilot. Stock is 350 main. I am 5280' above sea level and sometimes go higher. Why would anyone go as small as 310 on the main? I asked the guys at the shop but they were kind of unclear and didn't give a good answer. 

 

3. My trans oil comes out milky black. I just switched to belray gear saver. Does milky indicate a water pump seal issue? It's not too milky but I notice it. 

 

Thanks!

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When was the last time you or previous owner changed the oil and rebuilt the clutch?

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When was the last time you or previous owner changed the oil and rebuilt the clutch?

 

Not sure. He gave me a brand new clutch kit for it. He said he went in to replace it and the clutch was still really good. Could this be my issue?

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The milky black substance could be clutch material

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The milky black substance could be clutch material

Nice! Thanks for the info. I'm soaking the new clutch in oil now. I will replace it later today. Thanks again!

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