Author Topic: Throttle twistgrip doesn't snap back  (Read 248 times)

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JulianS

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Re: Throttle twistgrip doesn't snap back
« Reply #15 on: 08 January, 2019, 19:20:52 »
Spacer to head just a gasket.

Carb to spacer no gasket just the O ring, I suggest a new O ring.

The gasket and O ring will not seal if carb flange is bowed.

No jointing compound needed.

Bees

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Re: Throttle twistgrip doesn't snap back
« Reply #16 on: 08 January, 2019, 20:09:16 »
Does the slide move freely in the bore?
« Last Edit: 08 January, 2019, 20:37:29 by Bees »

Phil C

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Re: Throttle twistgrip doesn't snap back
« Reply #17 on: 08 January, 2019, 20:41:28 »
Mmm, Julian you say carb to spacer no gasket, but there is one there at present  (see photo), and I ask myself why. I guess it might be there for a reason? Difficult to decide whether to keep (renew) it, or get rid of it.
I'll renew the O ring in the carb.
Forgot to check the carb flange for bowing, and have left it with the bloke who is making up  the cable. Will check it when I get it back (actually he might well have checked it anyway.)
Bees, the slide didn't move completely freely round its circumference - when the slide was rotated it was loose in some places, tight in others - my local expert reckons it's been knocked at some stage.  Anyway, apparently it's fixable.
Just checked the battery, which has been on charge since this morning: it's now full, so that's good. I can investigate my no-headlight-or-tail-light issue. (Stand by for more stupid questions!)

Phil.

PS shed not very inviting just now. A bit cold. Next time I move house there'll be a nice garage.

Phil C

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Re: Throttle twistgrip doesn't snap back
« Reply #18 on: 08 January, 2019, 20:44:50 »
Here's the photo.

Phil C

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Re: Throttle twistgrip doesn't snap back
« Reply #19 on: 08 January, 2019, 20:58:53 »
I see the drawing on the Draganfly website appears to show it as Julian says regarding spacer and gasket. I guess I'll try that: so, a gasket on the barrel side of the spacer but not on the carb side. And no jointing compound. A light smear of oil, I guess.   Phil.

JulianS

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Re: Throttle twistgrip doesn't snap back
« Reply #20 on: 08 January, 2019, 22:01:42 »
There is a lot of good information on the Concentric on the Amal site. It is worth reading.

http://amalcarb.co.uk/rebuilding-mark-1-concentric-carburetter

AdrianS

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Re: Throttle twistgrip doesn't snap back
« Reply #21 on: 09 January, 2019, 09:05:28 »
I have never used any jointing compound between any of these joints. It should not be necessary.
Just make sure the carburettor flange if flat -they do become distorted through overtightening. Check it with a straight edge and if necessary flatten it. I used a piece of thick glass with some valve grinding paste on it as an abrasive. Make sure you clean it of well!
When refitting, do not overtighten the carb nuts. Just nip them up so they are secure.