Question about 1992 Honda CB 750 Nighthawk

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Honda motorcycle engine valve cover gasket

I have a 1983 honda cb450sc nighthawk and im still the original owner i am going to put a new engine valve cover gasket and two rubber gaskets on the screws on each side they must be #14 my question is do i need to put some silicone on the gaskets or oil it a bit

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  • Paul Meyer
    Paul Meyer Jan 05, 2018

    Hi Tony! Put them on dry. They will fit with heat into place. If they weep a bit, tweak them up a bit with spanner. Good Luck.

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  • Honda Master
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Put them on dry.

Posted on Mar 21, 2014

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Your petcock is vacuum operated. Gasoline leaking from the vent hole indicates that the vacuum diaphram is ruptured. A new petcock assembly is needed.

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1 Answer

Engine cover torque


Just so we're on the same page here, let's look at this exploded view:

http://www.bikebandit.com/houseofmotorcycles/1983-honda-night-hawk-450-cb450sc-cylinder-head-cover-camshaft-holder/o/m151747sch4499

I assume you mean the bolts that are #14 in the illustration, right?

The torque on these isn't much, it's only 6 - 9 ft-lb (72 - 108 in-lb)

Feb 10, 2014 | Motorcycles

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Signs of a bad valve cover gasket


My first question would be, what was the original trouble code that directed the mechanic to replace the sensors ? You seldom need more than one O2 sensor at a time. Its possible the exhaust manifold is leaking and that might cause a problem that would turn on the warning light. Or it could be something else.
A valve cover gasket will leak oil if it fails. No check engine light.

May 15, 2013 | 2000 Jeep Grand Cherokee Limited

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2000 Honda XL 1000 V Varadero rocker cover gasket blown


Hi, Anonymous there may be a restriction in the engine breather hose for this scenario you will need your service, parts fiche, and owners manual if you can't find the best tool you ever bought for your Honda, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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I have oil on tip of plug wire on only 1 of my spark plugs,all others have a little oil on spark plug itself.I just had the timing belt done ,water pump all sealas and head gasket,new wires do i need to...


You need a new Valve Cover Gasket. The rubber seals around the spark plug holes on the Valve Cover are leaking. A new Valve Cover Gasket will come with the round gaskets that seal the spark plug hole.

Jul 30, 2011 | 1995 Honda Accord

2 Answers

Hi l got a 84 nighthawk 700sc cant get the clutch to bleed l just put in a new kit in the master cylinder.


Loosen the banjo bolt on the clutch master cylinder, Put a plastic sheet and a rag under the banjo, pump the lever a couple of times till DOT 3/4 brake fluid starts pouring out past the sealing washers. You have now gotten the air out of the master cylinder. Tighten the banjo bolt, bleeding the lines should now be easy.

Jun 09, 2011 | 1984 Honda CB 700 SC Nighthawk

1 Answer

I want to change the valve gasket. I see 2 bolt on the top of it can i do it for myself. im wondering maybe there is some parts attach to it. mitsubishi galant 79 model.


Hi,
That two bolts is the one holding the valve cover and the air filter housing.
No worries, just remove the bolts, and remove the old gasket around the cover.
Upon installing new rubber gasket, make sure it is clean. Put a silicone sealant around the canal, where the new rubber gasket would be placed, not too much sealant.
Put the new gasket, and now you can put back everything as you have removed it.
Hope that seals everything!
Thanks for using Fixya!

Dec 10, 2010 | 1986 Mitsubishi Galant

1 Answer

When i take off the plug wire for the first two plugs they are covered in oil. when im trying to crank it and put it in drive my rpms drop to zero.


The oil you are seeing is more than likely due to a blown valve cover gasket. Replacing one on these vehicles is not too difficult a task and not too pricey. The gasket runs about $40 at most chain stores.

First clean off the top and sides of the engine and make sure that it is clear of loose dirt and debris as you will be exposing some delicate pieces of the engine. Next label and remove the spark plug wires and the vacuum lines that are connected to the valve cover. The next step is to remove the bolts that hold the valve cover in place. These bolts are the torx topped bolts that are visible on the top of the valve cover. I believe that there are 6-8 of them. Once they are out gently remove the valve cover and inspect the channel that runs along the outside edge for any possible remaining pieces of the original gasket that may be stuck to it. Place the valve cover aside in a clean safe area. Next inspect the channel along the mating surface of the engine for any remaining pieces of the original gasket as well. After cleaning the channel to free it from any debris begin placing the new gasket into it's channel. Align the gasket in the channel around the outside of the block and around the spark plug holes and then carefully press it into place. After giving the valve cover another look to make sure it is free from any foreign materials replace it back on the engine and replace the valve cover bolts and tighten to spec. Depending on the condition of the original spark plugs you may wish to replace these as well... having been saturated in oil I would suggest it. I like ngk's. Be sure to check the gap when replacing. Replace the the wires and vacuum lines and then give the engine a try.

Nov 26, 2010 | 1993 Saturn SL2

2 Answers

Oil leaking into sparkplug holes on rubber boots


Buy a new valve cover gasket set (and a small tube of silicon high temp sealer). It comes with new rubber seals for each sparkplug hole, and the cover perimeter.Use a little silicon glue on the gaskets to hold them in place. Take your time,do the work with a cold engine in a shaded area. Clean all the oil off the wires and make sure all the old gasket rubber is cleaned off.And check to make sure before you put the cover back on that no old gasket pieces are in the engine.

Sep 20, 2009 | 1992 Honda Accord

2 Answers

After replacing valve cover gasket with dry fel-pro gasket,


Your new gasket has tabs that make it easy to set in place; the tabs hold the position properly on the cylinder head. The gasket also has the rubber coating to establish a tight seal between the cylinder head and the the valve cover, even if there is slight damage or warping. Proper torque for the valve cover bolts is between 50-100 in-lbs., which is about 8 ft-lbs for a maximum.

If you have the gasket properly set, and proper torque on the valve cover bolts, you should not leak.

If you still experience a leak after double checking the gasket and the bolt torque, I would replace the valve cover itself. You will find several at most any salvage yard, and probablly will cost you $10.00 or less for a used valve cover.

I hope this helps you, and I wish you luck on your repair.

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1 Answer

Spark plug well filling with oil.


a new valve cover gasket and o-rings around the wells should have cured this...did you clean the old o-rings off the valve cover completely before installing new ones? this is a common problem with these models.....i would re-check my gaskets and mateing surfaces. valve cover gaskets and spark plug well o-rings are relatively low cost. the spark plug is tight, correct? write back with an update!

Oct 16, 2008 | 1992 Honda Accord

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