Author Topic: 038 diagnosis help. See video  (Read 290 times)

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Offline Mark71gtx

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Re: 038 diagnosis help. See video
« Reply #20 on: October 01, 2015, 08:29:45 am »
Another problem that seems to crop up on the 038 series is the annular buffer shock mount which is on the left hand side aft of the engine .

These can become worn out allowing the intake boot to become stretched which will tear them on the under side .It's nearly impossible to tell if the boot is damaged unless it's removed and inspected .Obviously with a slight tear it won't leak air all the time and will cause a lean out at high speeds .Won't happen all the time though .I've changed around 4 or 5 of these things along with the buffers .
Thanks Al, but I don't seem to be running lean.  I am over rich if anything. 

Offline Moparmyway

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Re: 038 diagnosis help. See video
« Reply #21 on: October 01, 2015, 08:56:42 am »
Does it rev higher than the last video with the air filter off or is it still cutting out at similar RPM's in similar fashion ?

Offline Mark71gtx

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Re: 038 diagnosis help. See video
« Reply #22 on: October 01, 2015, 08:59:36 am »
Pretty much the same until I completely close the H setting.  Then it sounds about like it should.  It does seem to be pulsing a bit though.

Offline Moparmyway

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Re: 038 diagnosis help. See video
« Reply #23 on: October 01, 2015, 09:04:03 am »
Sorry, but just being clear .......... this is with NO air filter - correct ?

Offline Mark71gtx

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Re: 038 diagnosis help. See video
« Reply #24 on: October 01, 2015, 09:05:45 am »
Yes.  It still has a pulsing sound with or without filter.

Offline Moparmyway

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Re: 038 diagnosis help. See video
« Reply #25 on: October 01, 2015, 09:08:42 am »


 I suggest going over that carb again ............ swapp carbs if possible
IIRC, you did rebuild the carb ? Did you see any dirt or corrosion anywhere in there ?

Offline Mark71gtx

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Re: 038 diagnosis help. See video
« Reply #26 on: October 01, 2015, 09:15:25 am »
I did rebuild the carb.  It was not as bad as some I have built before that gave no trouble.  There was some trash in it when I pulled it back apart.  I blew it all out with canned compressed air (keyboard duster).  The saw was thrown away, so there is no telling what it has been through. I think I will go ahead and buy another carb for it and see how it goes.

Offline Moparmyway

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Re: 038 diagnosis help. See video
« Reply #27 on: October 01, 2015, 09:17:42 am »
i have had a few carbs look good, but couldnt tune ............ corrosion in the passages that couldnt be cleaned.

Is it possible that you inadvertantly swapped high and low adjusting screws ?

Offline Mark71gtx

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Re: 038 diagnosis help. See video
« Reply #28 on: October 01, 2015, 09:19:58 am »
It is possible.

Offline Mark71gtx

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Re: 038 diagnosis help. See video
« Reply #29 on: October 01, 2015, 09:35:46 am »
Is there any difference in the carburetors on a 038, 038AV, Super, and Magnum?  I am looking at some online that only list for 038, not Magnum.  I don't want to get the wrong carb.  Lots of the ones I see have an extra port on top, so o am steering clear of those.  I figure I will get another Tilliston or a Bing.

 

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