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Identification is spot on. Take the mixture/air screws out and make sure they are intact. IIRC they have a really fine needle on the end of them, if you screwed them in too tight it would shear off in the carb body, there is also a spring a washer and a really small oring fitted on it. Spring on first, washer to stop the spring cutting into the oring, then the oring. You may need to fish it out of the hole. The slow jet looks to be a push in fit, been many many years since I mucked with a set of those carbs so can’t say for sure how it comes out.
Quote from: Oddjob on January 21, 2024, 05:51:18 PMIdentification is spot on. Take the mixture/air screws out and make sure they are intact. IIRC they have a really fine needle on the end of them, if you screwed them in too tight it would shear off in the carb body, there is also a spring a washer and a really small oring fitted on it. Spring on first, washer to stop the spring cutting into the oring, then the oring. You may need to fish it out of the hole. The slow jet looks to be a push in fit, been many many years since I mucked with a set of those carbs so can’t say for sure how it comes out.Brilliant! thanks so much.I discovered that the slow jets are correct size ( 42) . They are push in and apparently designed never to come out! I won't mess with them.I looked at airscrews , no washer or spring in any of them. Hopefully when i redo carbs the bike will run a lot better. The previous owner seems to made a hash of them. Bike hard to start and can't get over 65 mph...... Brian
The slow jets DO need to come out as bothe the jets and passAgeways block for a passtime, grip firmly with vicegrips and pull and twist at same time.Refit with light tap from soft hammer.EDITYou can get replacements from Sirius Consolodated in canada along with the O rings and washers for the mixture screws but their website is a nightmare to navigate
I pulled the ones out of my PD50’s by heating carb body with a hot air gun. Wrapped a pice of rubber tube around the jet and it pulled out pretty easy.
A few pics that may help.
I did think you pulled them out TBH BUT I wasn't about to say grip them with pliers etc as it sounded a little brutal to me and likely to mark the outer part. Glad to see my memory was right about the air screws, exactly as I remembered them, not bad for 40 odd years ago.
Probably not worthwhile just for a single job, but these Kniipex twingrip pliers have a "bore" in the nose that's particularly effective in gripping a cylinder https://www.amazon.co.uk/KNIPEX-82-01-200-atramentized/dp/B09FPZPY96/ref=asc_df_B09FPZPY96/?tag=googshopuk-21&linkCode=df0&hvadid=641638718575&hvpos=&hvnetw=g&hvrand=6235607503535841976&hvpone=&hvptwo=&hvqmt=&hvdev=t&hvdvcmdl=&hvlocint=&hvlocphy=9045915&hvtargid=pla-1640846664898&psc=1&mcid=e02a7d1495603634ba0636b3393dbad5&th=1&psc=1Obviously a limited use here but very effective. Usually when you turn to get the pliers out something has failed, stuck or broken, these really do grip like hell to avoid slipping and seem a good addition to a toolkit.