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- Newsgroups: rec.motorcycles
- Path: sparky!uunet!gumby!destroyer!news.iastate.edu!vincent1.iastate.edu!viking
- From: viking@iastate.edu (Dan Sorenson)
- Subject: Re: CB750 Gasket(?) question
- Message-ID: <viking.728245731@vincent1.iastate.edu>
- Sender: news@news.iastate.edu (USENET News System)
- Organization: Iowa State University, Ames IA
- References: <C1FBDF.AnJ@ux1.cso.uiuc.edu>
- Date: Thu, 28 Jan 1993 18:28:51 GMT
- Lines: 35
-
- In <C1FBDF.AnJ@ux1.cso.uiuc.edu> mikeh@ux1.cso.uiuc.edu (Mike Hollyman) writes:
-
- >I have a 1982 CB750 Custom. It leaks oil around the cooling fins near the
- >1st cylinder, at the head gasket (1/3 way down). Now, the problem I have been
- >having is the first cylinder does not fire until the bike is run for quite
- >some time (20-30 minutes). I am assuming this allows the engine to heat up
- >sufficiently that the oil is "burned off".
-
- That's possible. Did you check the spark plug during this time? If
- it's oily, your gasket is shot. If gas-covered or completely dry, a carb woe.
- If none of the above, you have a strange bike.
-
- > I have the engine out and am disassembling it
-
- This is the easy part. Getting it back into the frame is a bitch.
-
- Anyway, it's not likely it's rings. A leak-down test, both wet and
- dry, will give more insight. I'd bet you've toasted a valve. At least,
- that's what I did. It shows similar symptoms to what you've described.
-
- >The other problem I have is at full throttle, it cuts out at high rpm's
-
- Carb problem. Clean 'em, paying close attention to the main jets.
-
- >I cleaned the carbs out last year and this problem was before and after the
- >cleaning. Would an after market jet kit help? I have MAC 4-2 exhaust on it.
-
- Jetting needs to be changed anyway. Grab a DynoJet kit -- it's
- about the same price new jets will be anyway.
-
- < Dan Sorenson, DoD #1066 z1dan@exnet.iastate.edu viking@iastate.edu >
- < ISU only censors what I read, not what I say. Don't blame them. >
- < USENET: Post to exotic, distant machines. Meet exciting, >
- < unusual people. And flame them. >
-
-