The Audio-Talk Motorcycling thread.

[andrew Ivimey]

Of course I really haven't got a clue what the bass n treble controls are! It seems to me that they would get in the way of what is supposed to be happening in the er, cylinder?

[Dave the bass]

Don't tell MarkJ this info (he thinks they're bass n treble controls...hehehehehe etc.....).

The pointy-out thingys are the ends of the valve stems. The inlet valve allows the air/fuel mixture into the combustion chamber and the exhaust (does what it says on the tin) lets the burnt gasses out where it flows into the exhaust pipe. The bits you can see sticking out are usually covered by springs which help close the valves after they've been opened by levers called rockers (they rock up and down).

See here...


Hope that helps.

[Mike H]

To the foregoing ...


Tried on the new handlebars to see what they look like and if everything fits. They'll come off again later because I want to add bar-end indicators, so will need to drill a hole in the middle of the tube to let the wires out.

Prior to this as the front wheel is in to be trued up, I attached the front brake cable to see how it fits, jeez I've forgotten how rubbish these cable drum brakes are! I might need to look at a better cable ...

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[Baggy Trousers]

Glad to be of service, feel free to ask anymore questions, if I don't know the answer I can always make something up

Be careful.

I was still at school when the early atomic tests were being conducted in Australia and the Pacific. During a lunch in the dining hall, the master in charge of my table (and who must have heard that I had just completed my first Williamson and therefore was frightfully expert) said
Tell me, young Trousers, what is this radioactivity I keep hearing about?
Well, at that age I already was a disciple of Oscar Wilde who claimed that there was nothing wrong with talking nonsense; the crime was to do it unconvincingly. Not liking to be stumped for an answer, my response was
Well sir, radioactivity is an electro-physical phenomenon whereby nuclear fission causes a wireless to spring into life, regardless of whether it is switched on or off, or even plugged in.

Thank you.

A few weeks later and under similar circumstances, the master said
Trousers, do you remember my asking you about radioactivity?
I suspected something less than pleasant might be brewing, so hesitantly said
I think so, Sir.
Well, It might interest you to know that I quoted your explanation at a Rotary Club meeting last week and was made to appear extremely foolish as a consequence of your devilry. See me in my study after dinner this evening.

Needless to say it was six of the best.

Prenez garde!

[Neal]

Looking good Mike but are you sure that’s not a push bike you’re building

[IslandPink]

That's harsh treatment Mr. BT. - 'buyer beware' ! One has to be open-minded about the benefits of education.

[Mike H]

Looking good Mike but are you sure that’s not a push bike you’re building

Yep it's not too many steps up from a push bike. A whole 4 horsepower don't you know. To stop you chuck a brick out tied to the end of a piece of string.


Today I did some wheel truing – neffer dun it beefor but it all seemed to go rather well
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[Dave the bass]

That's harsh treatment Mr. BT. - 'buyer beware' ! One has to be open-minded about the benefits of education.

Have no fear Mark, I'll keep learnin' you reel good and proper like!

[steve s]

The bsa is going in the right direction managed to get a few hours in this week on it, rear brake rod made, handle bars sort of loaded up, and a few other little jobs. waiting for a new throttle cable, next job is the engine, but there's a couple of weeks work in decorating our hallway that will put this on the back burner.

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[Dave the bass]

Brum Brum!

[steve s]

Brum Brum!

I'm a way off making any sort of noise dave..

Excepting a fair bit of occasional swearing !

[Baggy Trousers]

That's some valve lifter handle.

[steve s]

That's some valve lifter handle.

Your right.. I have the smaller type but the cable has the wrong end for it..
And its one of the few cables in good nick..

[Dave the bass]

Talking of which...I only run the 500cc Bullet at (Indian home market) standard 6.5:1 compression so I've decided to try it without the de-compressor and blank it off with the kit. Its an easy swap if I find its too much to kick over. It's all in the technique y'know etc etc.





In other news, I've had to learn how to fit a helicoil insert, one of the rocker studs let go when I was reassembling, meh.



That neat coil of alloy should be in here....


(middle hole is the rocker oil feed), whatta bummer.

Hooray for the interweb and tutorials, so I bought a BSF 1/4" to 1/2" set which will set me up nicely for sorting out the billion and one naff threads in the GT250 when I rebuild that too...

[pre65]

I'd consider helicoiling the lot whilst it's apart Dave.