Webbo Posted April 12, 2015 Report Share Posted April 12, 2015 Hi , I have just serviced my cd150 which seemed to go quite well until I bolted the cover back on. This has prevented the air valve from dropping fully onto the base. Without the cover on it is fine , which seems to me to indicate a miss alignment between the cover , air valve and the needle valve, which I am sure was not there before I attempted the service. Any thoughts? Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 13, 2015 Report Share Posted April 13, 2015 undo the large support hex nut 1/2 turn take the jet adjust nut up till the jet just touches the air piston ( Hold piston down with screwdriver down the dashpot ) give the big nut a sharptap and nip it up this will centre the needle with the jet and allow it to fall with a clunck. turn the jet adjuster down 3 turns run till hot and then adjust to give best running Pte Link to comment Share on other sites More sharing options...
Webbo Posted April 13, 2015 Author Report Share Posted April 13, 2015 Thanks for the tip Pete will give it a go at the weekend. Link to comment Share on other sites More sharing options...
jondhm Posted April 14, 2015 Report Share Posted April 14, 2015 I hope it is not one of the later CDSE carbs, because these don't have the same means of adjusting the jet. I would be inclined to ensure all mating surfaces are really clean - if the air valve moved OK beforehand, then it should move OK when reassembled. And then rotate the cover a few degrees either way before screwing it down to bed it in. Link to comment Share on other sites More sharing options...
Webbo Posted April 14, 2015 Author Report Share Posted April 14, 2015 Thanks jondhm, I don't think it is the later type but will try bedding in the cover as I have a feeling this could also be part of the problem along with the needle alignment. Link to comment Share on other sites More sharing options...
Colin Lindsay Posted April 15, 2015 Report Share Posted April 15, 2015 You have to tighten the cover screws gradually, testing for free dropping all the time. Tighten one gradually, test the drop, tighten another, keep checking for free movement and adjust as necessary until the cover is fully tightened and the piston still drops freely. You probably already know this but I’ve seen owners tighten the cover down fully with no adjustment then try to move the piston afterwards, with predictable results. Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 15, 2015 Report Share Posted April 15, 2015 if you have a rubbish thick diaphragm it wont help they should be a very light and flimsy they will last for thousands of miles /years use old wrinkled ones that have swollen with oil can revert to normal with a quick wash in petrol Pete Link to comment Share on other sites More sharing options...
Webbo Posted April 17, 2015 Author Report Share Posted April 17, 2015 Thanis again gents, I did'nt know to tighten the bolts gradually ,thinking about this seems to make sense and I suspect this could be the problem. As to the diaphragm it does seem thick, a lot thicker than the one I replaced, will try to resurrect the old one, thanks again. Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 18, 2015 Report Share Posted April 18, 2015 if its made from recyled elephant condoms they tend to be slow and the rubber holds the piston should be flimsy, resemble marigold gloves not inner tubes Pete Link to comment Share on other sites More sharing options...
Webbo Posted April 19, 2015 Author Report Share Posted April 19, 2015 Pete, have just put the old flimsy diaphragm back on, sorted, happy days. Link to comment Share on other sites More sharing options...
Pete Lewis Posted April 19, 2015 Report Share Posted April 19, 2015 You See elephants have a lot to answer for being a dinosaur I shouldnt comment good when the basics work and ....cheap pete Link to comment Share on other sites More sharing options...
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