SOHC.co.uk Forums > CB500/550

Throttle service

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beardylondon:
My throttle is sticking, probably just needs lube, but I just wondered if anyone has any pointers, to get it smooth, are there any serviceable parts?

McCabe-Thiele (Ted):
On my 400 I removed the throttle tube, cleaned it using a bottle brush with washing up liquid, dried it, then used a very light smear of Silcone grease (as used by Plumbers for mixer tap swivels) obviously cleaned the bar part as well, it's surprising how the muck accumuates. If the tube has cracked inside I would replace it. I tried Silicon Spray but the grease worked better for me.

Johnwebley:
First find out what is causing it,

My 500 has a return spring you could tow a truck with,

Or do you have a "hanging " throttle?

That could be out of sync carbs

Sent from my SM-A546E using Tapatalk

beardylondon:
Thanks both. Symptoms are that if you turn the throttle it sometimes, not always, sticks at a higher rpm than idle. You then have to manually wiggle it and make it return to idle.

McCabe-Thiele (Ted):
That does not sound like it's the throttle tube action, I would check the two throttle cables for correct action.

As has been mentioned by John that might be the so called "Hanging Throttle".
There is a thread on this subject, link below.

.https://www.sohc.co.uk/index.php/topic,31510.0.html

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