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#1
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Does the engine completely shutdown, or just slow up?
You do not state how much time you had in between the first failure, and the one yesterday. Had you flown the airplane much in that time frame? Diagnosing and troubleshooting intermittent problems is most likely time and materials, there is no probable estimate. It would be logical to suspect the JPI sensors, unless you have flow it a lot, more than 25 hours. Are you seeing higher egt's, cylinder head temps, just before failure? If so, that would indicate a leaning condition. However, if it just shuts down, it is a different problem. Some obstruction to the fuel line, completely blocking the fuel flow 
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#2
11-04-08, 10:31 AM
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T337c
Larry,
The fuel flow drops precipitously and the engine shuts down. I did not notice temps rising, it seems like they were falling with the fuel flow. Got plane back early October. The first event was a little over a week and 15 hrs later. The second event was the same flight about 15 mins later. 3rd event was about another 15 hrs later (a week and half or so). Last event was about 10 hrs later (about a week or so from #3). I understand it will be t&m. Just trying to get ideas before getting into a big guessing game with a lot of unneeded replacements. ________ Yamaha yp400 majesty specifications Last edited by rmorris : 03-12-11 at 11:57 AM.
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#3
11-04-08, 11:22 AM
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The airplane really doesn't have fuel filters, they are just screens. There is no added value in replacing them. Replacing the "O" rings on the gascolators would be a greater benefit, as air could be sucked in around the seals and the seals may not show external leakage.
What are the fuel flow indications just prior to the engine problems?
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#4
11-04-08, 12:06 PM
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T337c
Quote:
Are the gascolators the large spider type thing at the top of the engine? I'm sure the IA will know, but I'm just trying to visualize the difficulty and costs involved in just swapping out the o-rings. ________ Cheap Airsoft Bbs Last edited by rmorris : 03-12-11 at 11:58 AM.
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#6
11-04-08, 01:03 PM
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Quote:
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#7
11-05-08, 02:14 PM
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If you are truly concerned about the problem why not take it to a shop and have it fixed? There's really no way to troubleshoot and find the problem via email or a newsgroup.
Your mechanic is correct, it could be one or more different items.
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#8
11-05-08, 02:59 PM
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Quote:
Clearly there is great value to getting information from others before, during, and after working with anything (plane or otherwise). Might as well just say, 'take our checkbook and plane and drop them both off - they'll both get fixed for you'. I take great pride in getting to know my plane and it's systems. I don't try to fix it myself, for both legal and practical reasons, but it helps to get educated. I then try to share my experiences, where applicable, with others. I appreciate that you took the time to post a response, just wished it had more than 'go get it fixed and leave us alone' as the theme. ________ HONDA VF750S Last edited by rmorris : 03-12-11 at 11:58 AM.
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