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Glenlivet

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Reply with quote  #16 
Quote:
Originally Posted by steelhead
burnt out exhaust inner housing and megaphone points to too lean air/fuel mixture, causes can be plugged lean injectors, air leaks in fuel to motor, low fuel pressure.

Always start with compression tests, fuel system pressure vacuum and air in fuel tests

Lean running motors have been self destructing since the first outboards, starts with piston and ring damage, often shows with compression and leakdown testing.

I run a compression test each off season as part of service.

The engine was over propped when I bought it, although with 50 hours the damage was fairly catastrophic! No sign of it running lean, in fact trying to start using choke kills it. I’ve put 50 odd hours on it this year so far and, apart from the stated problem, it’s running well. I’ve got hold of a couple of cans of engine tuner, I’ll try those and the new filter then take it from there. I’ll get a compression testing kit but lack of a qualified Evinrude techie on the island makes life difficult.

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Glenlivet

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Reply with quote  #17 
Quote:
Originally Posted by Crosbyman
careful on the vst filter change….  don't crack the vst body itself 
btw  I did mine  last month after 13 years just in case ….at the dealer….

VST filter was probably 95% clean  with 2-3 very small black  specs 

air blowing it  backwards   would probably have been   sufficient but for the price ….I sleep better 

Your engine is about the same age as mine, was your filter pointy end in or out? I’ll be doing mine on a drying mooring so will be ultra careful!

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Huey

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Reply with quote  #18 
On a 2005 model the VST return filter will have the tip pointing out.
steelhead

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Reply with quote  #19 
Overpropping can also cause piston/ring/combustion chamber/head gasket damage and eventual failure from overly excessive combustion chamber temperatures.

Compression and leakdown testing can find problems early before damage is serious, failing reeds, head gasket/seal O ring, broken rings, ring catch on port, cylinder not oiling due to plugged line/oil return valve, etc

One weak low compression cylinder will cause idle problems

NO manual choke or manual enrichment valve on E-TECs.  ONLY EMM electronically controlled cold start air/fuel enrichment.  Pushing in the key does NOTHING on E-TECs except make one feel good.
Glenlivet

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Reply with quote  #20 
Quote:
Originally Posted by Huey
On a 2005 model the VST return filter will have the tip pointing out.

Thanks Huey.

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Glenlivet

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Reply with quote  #21 
Quote:
Originally Posted by steelhead
Overpropping can also cause piston/ring/combustion chamber/head gasket damage and eventual failure from overly excessive combustion chamber temperatures.

Compression and leakdown testing can find problems early before damage is serious, failing reeds, head gasket/seal O ring, broken rings, ring catch on port, cylinder not oiling due to plugged line/oil return valve, etc

One weak low compression cylinder will cause idle problems

NO manual choke or manual enrichment valve on E-TECs.  ONLY EMM electronically controlled cold start air/fuel enrichment.  Pushing in the key does NOTHING on E-TECs except make one feel good.

If the vst filter and tuner make no difference I’ll try a compression test. Interesting about the lack of choke, strange they still have the spring loaded key push. Maybe for psychological purposes!

I’m also going to change my engine battery as I think the current one may be nearing the end of its useful life.

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Glenlivet

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Reply with quote  #22 
Filter changed, two cans of engine tuner used and a new 830cca engine battery fitted. The old filter was surprisingly clean with just a couple of small dirty marks on it. The engine is now idling much better although from cold it takes a few seconds for the revs to pick up to 450-500 rpm. The engine feels smoother and more powerful throughout the rev range so a good result. It will do until the end of the season when I’ll do some more exploratory work once the boat is out of the water. The reason I asked in another thread whether the two air intakes are connected is that spraying tuner in to the top intake makes little difference to the running of the engine whereas spraying into the bottom intake has a pronounced effect on revs and produces great clouds of smoke. I also think that when the inner exhaust housing and megaphone were replaced that one of the seals was damaged as there is exhaust blowing from where the gear case joins the leg. This will also be investigated once the boat is on the hard.
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bunkergroup

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Reply with quote  #23 
A good result.. Thanks for the update. So no stalling when dropping back to idle or maneuvering at idle ?...
Glenlivet

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Reply with quote  #24 
Quote:
Originally Posted by bunkergroup
A good result.. Thanks for the update. So no stalling when dropping back to idle or maneuvering at idle ?...

No, idling when the engine is at operating temperature seems to be ok, although I still think an idle speed of 600-650 rpm would be better. It’s still takes a few seconds to settle when cold or only warm but I can live with that until the end of the season. I’m still thinking about changing the coils and plug leads, also changing to ‘premium’ fuel might be worth a try.

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