Question about 1993 Honda CB 750 Nighthawk

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I am leaking gas where the exhaust pipe goes into the cylinder head only on the pipe all the way to the left if you are sitting on the bike. I am a Mechanic by no means but a couple of months back I took off my carbs and cleaned them, I might have broke a seal, I not sure if this would have anything to do wit the leak on the pipe tho. Open to any idea on why i would be leaking gas by exhaust pipe and possable ways to fix , thanks

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Hi running _spid. I just went out to the garage and had a look at my 91 NH 750.It seems to me that if the gas line hose that attaches to the petcock is not fully seated into the petcock and the slip clamp is not seated properly a leak could occur there and drip onto the cooling fins and run forward to the left front exhaust pipe. That is where the leak would be evident. It would probably be wise to remove the tank to check for small cracks. Check that your petcock is tight. They have been known to loosen and leak. Hope this helps.

Posted on Oct 22, 2010

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Tank may hav leak-the soldered seals open up on old bikes--are u gitten any leak at carbs? may just need to inspec and titin any screws/bolts

Posted on Sep 29, 2010

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The oil you are seeing may very well be from the bike sitting. I have worked on many bikes that have had similar problems. The oil bypasses the rings and gets forced out the top of the cylinder. Once the bike has been used for a couple of days, sometimes a few days longer, the rings expand sealing the cylinder and thus no more oil. It would be a good idea to examine the cylinder bolts too to make sure that the oil is not leaking from the cylinder head.

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