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Throttle cable adjustment 13D

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Throttle cable adjustment 13D

Post  Bill on Tue Nov 20, 2012 12:40 am

Hi my engine is running too fast with adjuster in top of carb fully screwed in as is the outer cable adjustment at the twist grip. Screwing the adjuster on the carb out it increases the revs or apears to. Am I correct in thinking I need to reduce the lenghth of the outer cable to reduce idle revs.
I was happy the engine stared second kick after rebuild and some years of lying idle. Not so happy with the gearbox oil leak though, can I remove side plate from gearbox and reseal without stripping it down any further as it apears from the literature I have.

Regards Bill
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throttle cable adjustment

Post  Cruiser Ron on Tue Nov 20, 2012 4:35 pm

Silly question,but have you tried the throttle stop screw adjustment?

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throttle stop screw

Post  piston 197 on Tue Nov 20, 2012 4:54 pm

Silly question ,but what throttle stop screw ?? never seen one on one of these carbs,the adjuster screw on the side is an air screw,AMALs have a throttle stop screw ,villiers is adjusted on the cable,JH
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throttle stop screw

Post  MoscowFlyer on Tue Nov 20, 2012 7:19 pm

Of the carburetters I have, two are fitted with a trottle stop screw, whether they were fitted as standard or not, I don't know, there is certainly a facility for one, on some of the other carbs I have, in the way of a flange. I remember reading an article on fitting one of these, it may have been in the Directory. Mike



Last edited by MoscowFlyer on Tue Nov 20, 2012 8:03 pm; edited 1 time in total
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Villiers carb - throttle stop

Post  FB vincent on Tue Nov 20, 2012 7:36 pm

Since Villiers engines (except Bond minicars and some other oddities) do not have a throttle stop on the carburettor, surely it is normal to set the throttle cable so that the throttle is completely shut when the twist grip is turned away from the rider. This minimises 4 stroking on the overrun and provides for the engine to be stopped (since there is no engine cut-out); the standard twist grip provides an adjustable level of friction to prevent the throttle snapping shut by itself. You can used the forum 'Search' facility to find the earlier discussions as to how to fit a stop to a Villiers carburettor.

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Throttle stop

Post  piston 197 on Tue Nov 20, 2012 8:29 pm

Mike, yes some later car based S25's had the stop you describe,and the trials fraternity have long since modified the body to include one,but the 13D carburettor we were discussing has no such facility.JH
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Throttle stop

Post  MoscowFlyer on Tue Nov 20, 2012 8:40 pm

Yes, sorry about that John. At least I know a bit more than I did before, about these two carbs I have. It's good to talk. Mike
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Throttle cable adjustment 13D

Post  MoscowFlyer on Tue Nov 20, 2012 9:46 pm

Hi Bill, good to hear you have the engine running ok. Regarding the cable, I would say there is nothing else for it, but to shorten the outer cable. Mike
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Re: Throttle cable adjustment 13D

Post  Bill on Wed Nov 21, 2012 5:54 am

Thanks for all you coments. Shortening the outer cable did the trick.
Now for the gearbox but it will have to wait for a couple of weeks as I will be otherwise occupied.
Regards Bill
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