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96Yamaha

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About 96Yamaha

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    Ohio
  1. I have a 1996 yz 250 two-stroke. I bought this bike over a month ago and thought it had a jetting problem. It would bogged out and I would pin it and it would still bog and then eventually rise up and want to take out from under me. I thought it was running lean so I changed the clip position on the needle down to give it more fuel, it seemed to help out a lot but at certain times it would do the same thing again. The Yamaha shop requested I read jetted the bike one size up of Main and pilot jet from stock. I did and got the same results bogging at low and no matter how much I Clutched it. Occasionally it would run perfect! Than it don't fail.. It Boggs once again. If I put it in neutral and rev it sounds fantastic but when I put it in gear and rev with the clutch in the matter how high I keep the RPMs up soon as I let go it Boggs I can hold wide-open and then eventually it will clear up and rise out from underneath me, again .. occasionally. My dad's friend brought it to my attention that the power valve may be sticky. The last time I looked at the power valve it was pretty confusing and was very very very dirty. May I mention that Unburnt gas is pouring out of the power valve seal constantly. I was told that this probably means the bike is running to Rich or the power valve is sticking closed. But sometimes it rises so I'm thinking it might be sticking occasionally. Can I take off the right side of the power valve and rev the bike in neutral to see if it's lifting thus opening?. I seen a kid do it on a RM 125 but I want to make sure it's safe to have the power valve cover off while the bike is running as long as it's a neutral. Talk me through how to go about this because this is my first 250 two-stroke bike. I'd appreciate any tips or recommendations, thank you all!!
  2. I have a 1996 yz 250 two-stroke. I bought this bike over a month ago and thought it had a jetting problem. It would bogged out and I would pin it and it would still bog and then eventually rise up and want to take out from under me. I thought it was running lean so I changed the clip position on the needle down to give it more fuel, it seemed to help out a lot but at certain times it would do the same thing again. The Yamaha shop requested I read jetted the bike one size up of Main and pilot jet from stock. I did and got the same results bogging at low and no matter how much I Clutched it. Occasionally it would run perfect! Than it don't fail.. It Boggs once again. If I put it in neutral and rev it sounds fantastic but when I put it in gear and rev with the clutch in the matter how high I keep the RPMs up soon as I let go it Boggs I can hold wide-open and then eventually it will clear up and rise out from underneath me, again .. occasionally. My dad's friend brought it to my attention that the power valve may be sticky. The last time I looked at the power valve it was pretty confusing and was very very very dirty. May I mention that Unburnt gas is pouring out of the power valve seal constantly. I was told that this probably means the bike is running to Rich or the power valve is sticking closed. But sometimes it rises so I'm thinking it might be sticking occasionally. Can I take off the right side of the power valve and rev the bike in neutral to see if it's lifting thus opening?. I seen a kid do it on a RM 125 but I want to make sure it's safe to have the power valve cover off while the bike is running as long as it's a neutral. Talk me through how to go about this because this is my first 250 two-stroke bike. I'd appreciate any tips or recommendations, thank you all!!
  3. Thank you very much for the info and tips!
  4. 96Yamaha

    Design my bike! Custom design!

    Agreed. Thank you for all the help man!
  5. 96Yamaha

    Design my bike! Custom design!

    So needles to say it could be choked out by the pipe and lack of compression with the piston rings and bore, it could make a big difference in performance considering the engine is a big vacuum that works off of compression. I'm not sure if it could cause a big idle failure like that but it doesn't help! That for sure
  6. 96Yamaha

    Design my bike! Custom design!

    The engine makes some noise that's for sure. It's a ticking racking noise that doesn't sound good. My dad said 2 strokes 250's are just louder and noisier than a 125. Than he later admired the noise and realized the thing needs rebuilt. It also has a very small fmf silencer on it that looks like it could be from a 125. Reminding you that the previous owner was a stupid kid from Tctc that want a race bike. He prolly seen the fmf on it and said oh, I'll weld it on and it will be fast!
  7. 96Yamaha

    Design my bike! Custom design!

    I turned the air screw all the way in and all the way out. It had no effect on helping the idle. Even the idle adjustment knob
  8. 96Yamaha

    Design my bike! Custom design!

    1 1/2 turns out. This is where it ran the best with the clip a position down from stock. It had a big effect (good) on the top end and I don't think it had any effect in the bottom end at idle.
  9. 96Yamaha

    Design my bike! Custom design!

    The result of the iPhones talk to text. I Apologize
  10. 96Yamaha

    Design my bike! Custom design!

    The last time I rode it when I twisted the throttle wide open the engine would lower and RPMs and bog and finally clear up and the power valve would kick in and it would ride fine and high rpm. My dad told me that it was running Rich and air and lean and fuel, I'm starry that I didn't establish what was rich before. I lowered the clip in the needle thus giving it more fuel, and the bikes mid range and top band sounded and ran a lot better. No bogging besides the idle. I may have said 46 but I believe the pilot jet in my carb is a 48.
  11. 96Yamaha

    Design my bike! Custom design!

    edit- llowering the clip gives it more fuel
  12. 96Yamaha

    Design my bike! Custom design!

    I brought down the clip on the needle because low and mid range was not there. I had the throttle wide open and randomly it would kick in and scream. When I changed the position on the needle down one it helped alot and the mid and high ranges have power and sound good. But it still stalls at idle and it feels like a 250 should have more power than this. This is my first 250 from a 125
  13. 96Yamaha

    Design my bike! Custom design!

    I set it at stock settings and then opened it all the way up. It didn't help at all, the bike still stalled. I looked at the reeds and one side had a gap. I flipped them both around un till I could order boyson power reeds. The rubber that seats agents the plastic reeds are a bit chewed up. So they need replaced. Could that affect the idle? It has a 48 in it now, the Yamaha shop suggested I get a 46 for my pilot jet. What should I try in your opinion? If you let go of the gas it Immediately wants to stall.
  14. 96Yamaha

    Design my bike! Custom design!

    I cleaned the carb and assembled it. I rase the idle (on the plunger/choke) and the idle doesn't change. If I let the throttle go at idle, it stalls immediately. Any suggestions? You have the same bike as me and if like to ask questions while I have the chance. Sorry for squeezing every bit out of ya
  15. 96Yamaha

    Design my bike! Custom design!

    Thank you, I have a 48 pilot and 175S main and the needle in the 3rd position, the previous owner attempted to make a race bike from what I can see and failed.
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