Hey all just have a few random questions, so first when you change the sparks plugs do you put wd40 or anything on the thread if its really dry?

I wouldn't. WD40 is flammable. You can pick up small tubes of anti-seize compound specially made for spark plugs at any auto parts store.

Beat me^^ What he said

Change plugs on cold engine & don't use any lube,don't overtighten either.

Use "anti seize"  available at auto store....ask for anti seize for spark plugs....

Steel spark plug threaded into aluminum head can make problems........

Anti seize eliminates problems..

Do not use too much anti seize on the threads....

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Quote from: Jimbob on July 29, 2013, 11:01:39 PM
Hey all just have a few random questions, so first when you change the sparks plugs do you put wd40 or anything on the thread if its really dry?

Awesome, question 2: what is this?

[attachment deleted by admin]

Blurry?

This is a Klystron relay on a Class 3 Starship.............either that or it's unrecogniseable. 

I give up....What is this?


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Quote from: Jimbob on July 30, 2013, 02:27:11 PM
Awesome, question 2: what is this?

Please zoom out...showing more of the surrounding stuff would likely help us identify it easier.

saved it to the desktop .. then had a look at 25% zoom ... its that little canister thing that is bolted to the frame crossmember under the tank ... got a grey 5mm? hose going to it.... vacuum chamber thingy?

Yeah that's the thing

Quote from: fetor56 on July 30, 2013, 04:37:22 PM
This is a Klystron relay on a Class 3 Starship.............either that or it's unrecogniseable. 

Lol nice

As said before, use anti seize on the threads

and the vac can is apart of the emissions on the carb. You can disconnect it at the carb and cap off the vac line

found an old thread with a still working pic link to flickr .. its very basic .. but shows the thingy

http://www.flickr.com/photos/63425569@N04/5788595416/

So how does the vacuum system work. I mean the fuel is gravity feed to the side petcock how does it create a vacuum from there?

The vacuum is created by the engine and does 3 things in the case of the GS500.

1)  It sucks fuel into the cylinders from the carbs.

2)  It operates the carb slides which, along with the butterfly valves, control the fuel and air flow.

3)  It operates the petcock.  Inside the petcock is a membrane which at rest blocks fuel from exiting the petcock.  When vacuum from the engine is piped along and connected to the petcock, it pulls the membrane away and allows fuel to pass through.  The "On" and "Res" positions of the petcock are vacuum actuated and won't pass fuel unless the engine is running.  The "Pri" position is the carb prime, and bypasses the membrane allowing fuel to flow freely.  This is why on a bike that is running strangely you will often be told to run the petcock on prime and see if the issue clears up.  If it does, you could have a vacuum leak between the carb and the petcock, or the membrane inside the petcock could be clogged/dirty or faulty.

Yes, the fuel is fed to the petcock and then the carb via gravity, however vacuum controls the valve itself.



What the "vacuum can" does and how it relates to emissions I have no idea!  But I do know that the vacuum system is sensitive, and the slightest leak can cause poor engine performance.


In the case of cars, vacuum is used to power a whole variety of systems including the brake booster and in older cars the wiper blade assemblies!

Thanks for the explanation