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Old 29 May 2013, 15:36   #1
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Honda B75 ca1976 Cowling Prob?

I have the above engine which is running fine with the cowling OFF. But as soon as the cowling starts to go down from front to back the engine starts to run sluggish!!!!!!!!!! The cowling is nowhere near the ht leads or the fuel pipes when this happens and is also clear of the "STOP" button. I am baffled........any ideas???

Thanks in advance

Andy
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Old 29 May 2013, 15:45   #2
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not familar with this vintage, but is it somehow blocking intake air?
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Old 29 May 2013, 15:52   #3
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I thought that too but it's also clear (I even turned the intake round, to no avail). But thanks Capt.

High regards
Andy
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Old 29 May 2013, 16:26   #4
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Exhaust gasket leak at a guess. It'll be choking in it's own exhaust gas.
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Old 29 May 2013, 16:31   #5
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Thanks for that Nos4r2, that sounds very very feasable, all I need to do now is find out where that is
Too late tonight so I will have a gander at that tomorroe, thanks again

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Old 29 May 2013, 16:41   #6
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That's where it gets painful-it might be leaking where the powerhead bolts to the leg, which is a powerhead off job.


You might find the leak the same way you leak detect on tubes with fairy liquid, but if you try it, make sure you rinse it well afterwards as there's a lot of salt in washing up liquid.
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Old 29 May 2013, 17:27   #7
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I did spill some oil in the lower cowling so maybe that is causing a problem when it's burning off as you mentioned. I will give it a good clean and check the gasket out as you suggested.

Admirations and thanks
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Old 29 May 2013, 17:31   #8
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I might be wrong yet!

If there's oil down there, it won't burn off that much-the motor doesn't get that hot-so if you're seeing smoke, you've got a gasket leak.
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Old 29 May 2013, 17:39   #9
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I bow to your experience sir, and will check the gaskets. Can I check for "blowing" on the leg where it joins the motor?

Andy
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Old 29 May 2013, 19:39   #10
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If the gases are getting into the cowling, you should be able to see it somehow.
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