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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.


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  #11  
Old 06-11-2022, 03:23 AM
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Wtf! Sounds terrible. Is the Float setting wrong? Like it's running out of gas. Then sticks wide open!

Take your needle out and inspect for any scratches.


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  #12  
Old 06-11-2022, 07:50 AM
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F5, the throttle only stuck open in that video because that fallen tree was on its way to impaling me but it caught the crossbar and pulled the throttle cable WFO. I didn't see it coming because I was distracted by the engine problem and was wondering what my buddy was trying to tell me.

Leading up to that event you can hear the exhaust change (like the chamber comes loose) and engine lose power so I was struggling to make the climb.

The bike runs beautifully 99% of the time so I don't think its carb related but it seems like something is loose somewhere and gets jarred over rough terrain.
I will order some bearings as Jacob suggested but everything moves freely.

I'm leaning more towards aliens and want to just ditch the centrifugal governor and go with a servo driven valve like Yamaha's EXUP but that is a winter project.

Thanks again for the feedback,
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  #13  
Old 06-11-2022, 03:22 PM
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The jetting is perfect at WFO on its side!
Man,that could have been bad.
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  #14  
Old 06-11-2022, 04:43 PM
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If you did go servo you would need an Ignitech or Zeel ignition to drive it, plus a battery as they need a bit of grunt to drive them . A decent capacitor is going to sag way too much when asked to drive a servo..

Back to the float. My 300 was quite touchy to float height if the hill got steep, went lean and then like starving.

I ended up helping it a bit with a spacer under the drain thread and making sure gas could flow into that area with some grooves. Problem went away.
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'22 765 Street Triple RS
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'69 Stinger T125 Suzuki
'23 TRS 250RR (it's a Trials thing)
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  #15  
Old 06-16-2022, 07:44 PM
ec-txtr ec-txtr is offline
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Default New PV bearings

New bearings arrived and upon disassembly discovered that the old bearings that seemed to move fine over the range of travel in the cylinder were actually pretty bad. They felt like a set of chinese wheel bearings after a month of riding. I popped one of the sideplates off and found a ton of carbon. Its almost like one should change them more frequently than once every 11 years ...

Other lesson learned is to inspect the system more frequently. Everything looked pretty clean looking through the ports so I left it alone when I did the top end.

Hope to be back in the woods this weekend to verify the fix but thanks again for all the responses. You all nailed a probable root cause right away.
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  #16  
Old 06-19-2022, 04:00 PM
swazi_matt swazi_matt is offline
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thats true, but it is such horrible stuff you remove from there, leaves you with black blotches for weeks - like you are full of bruises LOL
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  #17  
Old 06-20-2022, 07:03 PM
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Default Confirming fix

Got the bike back in the rocks this weekend and ran flawless.
Changing the PV bearings fixed the problem.

Thanks again for all the feedback and suggestions.
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