Sticky Throttle

[Ritzah]

I took my bike for its MOT today and it passed OK, but the guy said that the throttle is very sticky, as in, when you rev it and then let go, it doesnt go back to the close position, it revs higher or just keeps the revs on and it isnt smooth when i use it either, feels rough, he told me what to do to make it smoother, but i forgot already does any one on here know how i can fix it, he said to lubricate something? cheers

[Kram]

wd40? or something like that round the throttle body (between handlebar and plastic)

and possibly round the mechanism on the carbs?
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FS1E -> SR125 -> CB400N -> CB650 -> FZR600 Genises -> VFR400 NC21 -> CBR900RR Fireblade -> Renault Clio 1.4

[Davo]

I'd also be tempted to lubricate the throttle cables as well as I've generally found that is the place where my throttles normally try and stick.

Basically take the throttle cable off the bike in turn, hold it vertical and tie a bag (to act like a funnel) and pour some normal engine oil in the bag, hold vertical until the bottom of the cable starts dripping with oil. Reattach to bike and repeat with the other cable (if there is one).

[mchaggis]

Take the throttle tube off the bar and clean the sticky muck out of the tube and off the bar. After that, use 3 in 1 spray lube, Handy oil or similar when you put the tube back on, between the bar and the tube. Tightening the return spring (twisting it round an extra turn at the bottom if possible) would also help, as would oiling the throttle cables. Ideally, if you hold the outer and lift the inner vertically above it and drop it, it should just slide through the outer as a result of it's weight, with no force needed. That is in an ideal world of course.
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[Barry_M2]

Remove your throttle cables and do the following....

Get a small plactic bag and cable tie it tight to the throttle cable, then fill with WD40, this will then seap down into the cable sleeve and lube the inside.

The opening where the cable goes into the sleeve is too small to spray directly into, this way works really well.

Have a look at my technical diagram I spent ages on it so dont laugh!

[Ritzah]

lol, cheers guys, i'll be trying out these theorys on the weekend

[BFG]

But don't use WD-40. Cables have steel outers and plastic liners. An organic based lubricant such as wd-40 or engine oil will damage the liners as it degrades plastic.

Better to use a silicone based lubricant. Halfords make a plastic lube in a can.

[Ritzah]

The guy at JP's Yamaha said to use Chain lube? Would that be ok to use