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Re: my WD M20 carburettor and possible blocking of pilot jet. Advice valued

thanks again Ron, I got the jet block out ok using a piece of shaped hard balsa wood and taps from a hammer. it is the bit at the bottom which has seemed reluctant to come unscrewed. I am a bit nervous about snapping off the thread in the jet block. would doing things like spraying with Wd40 or putting in hot water help do you think? all best again and thanks for any further guidance. peter

Re: my WD M20 carburettor and possible blocking of pilot jet. Advice valued

The upper half of the jetblock is very easily damaged/distorted and lots of them are.....especially if the carb has a larger bore, like the M21, here the top only stands on 2 very thin brass legs.

To tap out the jetblock without putting force on the top half I made this very simple tool from a spoke and a piece of aluminum.

IMG-7318

IMG-7317


BR Michiel

Re: my WD M20 carburettor and possible blocking of pilot jet. Advice valued

Well it's up to you if you want to risk undoing it, as you might need to undo it in the future. But as long as you've blown it through and can see no debris. Here is an exploded view. # 27 and 28 Ron
https://www.hitchcocksmotorcycles.com/partsbooks/pages/4769

email (option): ronpier@talk21.com

Re: my WD M20 carburettor and possible blocking of pilot jet. Advice valued

Thank you both for further advice and clarification. Now at last i think i understand how to remove the jets - pushing them out rather than unscrewing them. I haven't tried to remove them as I think the jets are clear and the engine now seems to be running much more regularly at low speed, so my next plan is to go for a run and see if how it runs in the shed is how it will stay running out over a distance. I am crossing my fingers. Sincere thanks for your really helpful feedback. peter

Re: my WD M20 carburettor and possible blocking of pilot jet. Advice valued

No No No! The jets are screwed in. Don't try and drift them out. Michiel's advice and home made tool are for removing the jet block. Ron

email (option): ronpier@talk21.com

Re: my WD M20 carburettor and possible blocking of pilot jet. Advice valued

Got it, thanks Ron, that at least is one mistake i won't be making now!! I feel a lot more confident about this now and if things don't go well with riding then i will try taking out the jets. I found getting the block out, with care and balsa wood and hammer - and then putting it back, straightforward. thankfully.

it is great to have this website and all the knowledge that goes with it. with thanks again and all best peter

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