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


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  #21  
Old 03-20-2020, 06:02 AM
Doc Brown Doc Brown is offline
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The leaking base gasket could have been the reason. At least I really hope that.

If you are not sure about the sound due to the fact its your first two stroke I recommend you to do what I did. I asked a two stroke nerd to listen how my bike sounded and he gave me good advice how to detect possible errors in jetting.
Though this was many years ago I am still grateful.

I really keep my fingers crossed for you.


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  #22  
Old 03-20-2020, 02:59 PM
TGM_OFFROAD TGM_OFFROAD is offline
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Ok so rebulid is done. Pressure test is good now after some gasket sealer with the base gasket. It held 6psi solid for 10 minutes. Sprayed water all around the base of the cylinder and left side crank seal since I already had the flywheel off and no bubbles.

I reinstalled the stock pipe and my turbine core 2.1 silencer.

I am using the stock head which in my case is the gp head since that was what came on my bike when I bought it used.

Reset my jetting back to stock
42p
A/S 1.5
N1EF needle at #3
175 main jet

Rode around in my parking lot since I was jot able to get to the OHV park today. Had to take my dog to the vet

First impressions, pilot is too rich but the needle is slightly lean around 1/3 to 1/2 throttle and main is too rich. It will sputter at WOT.

Here is two videos of cruising around, let me know if that sounds right to you

https://youtu.be/cfMVjM9BCQw

https://youtu.be/vi1GraiXyZY

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  #23  
Old 03-20-2020, 03:48 PM
TGM_OFFROAD TGM_OFFROAD is offline
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Quote:
Originally Posted by Jakobi View Post
Even at 44 seconds on the downhill she sounds likes shes lean with erratic idle. Like others said.. check your engine for air leaks.

Also take the time to cc the trapped volume.. especially if you've had a failure. Double check timing.. and I wouldn't bother with iridium plugs in a 2 banger.
How do I check timing on this bike? The timing is fixed also so I am not sure how it would get out of adjustment. Even at stock everything it does sound off compared to other bikes I have heard in videos. Could the CDI cause this.
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  #24  
Old 03-20-2020, 04:15 PM
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Jakobi Jakobi is offline
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Where was the base gasket leaking? I always use some sealant at the front and back where the cases meet. Did the cases show any signs of leaking on disassembly?

By timing, I was suggesting that the flywheel was retained properly and woodruf key not sheared, etc.
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  #25  
Old 03-20-2020, 04:38 PM
TGM_OFFROAD TGM_OFFROAD is offline
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Quote:
Originally Posted by Jakobi View Post
Where was the base gasket leaking? I always use some sealant at the front and back where the cases meet. Did the cases show any signs of leaking on disassembly?

By timing, I was suggesting that the flywheel was retained properly and woodruf key not sheared, etc.
Gotcha, the flywheel and everything looks good. I did have an issue with the woodruff key shearing when I first got the bike due to the flywheel not being properly torqued but I replaced the key, luckily the ktm key is the same dimensions because the gas gas one was not available at the time.

When I pulled the jug the base gasket was damp and torn at the rear. After the rebuild the rear was where the leak was coming from until I reassembled with some sealant.
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  #26  
Old 03-20-2020, 05:54 PM
TGM_OFFROAD TGM_OFFROAD is offline
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Went to 1.75 on the a/s and raised the needle 1 position to richen it up. It feels better but still doesnt sound right to me.

https://youtu.be/A-OFq-ObXPk
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  #27  
Old 03-21-2020, 03:03 AM
hannesd hannesd is offline
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Quote:
Originally Posted by TGM_OFFROAD View Post
Went to 1.75 on the a/s and raised the needle 1 position to richen it up. It feels better but still doesnt sound right to me.

https://youtu.be/A-OFq-ObXPk
sounds very rich, but your engine should be warm before judging your jetting.
in the clip it says you have needle at clip #4? why so high/rich?
this is not standard setting.
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  #28  
Old 03-21-2020, 05:46 AM
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Jakobi Jakobi is offline
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What temp and altitude are you running at?
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  #29  
Old 03-21-2020, 05:48 AM
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Jakobi Jakobi is offline
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Quote:
Originally Posted by TGM_OFFROAD View Post
Went to 1.75 on the a/s and raised the needle 1 position to richen it up. It feels better but still doesnt sound right to me.

https://youtu.be/A-OFq-ObXPk
So rich.. moister than a wet fart at the moment.

As per my last post, what temps, altitude and humidity are you running at?
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  #30  
Old 03-21-2020, 09:31 AM
TGM_OFFROAD TGM_OFFROAD is offline
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Quote:
Originally Posted by Jakobi View Post
So rich.. moister than a wet fart at the moment.

As per my last post, what temps, altitude and humidity are you running at?
Where I live is 15 feet above sea level, where I ride 80% of the time is 500 to 2500 feet. Temp was about 60 F with 70% humidity.
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