petegardner_901 Posted June 8, 2021 Report Share Posted June 8, 2021 Hi all Any ideas? I can’t seem to get the tick over down low enough on the twin HS4’s. I’ve set everything up really nicely - timing correct, mixture spot on but tickover is a minimum of 1200 rpm. Throttle screws are right out and there’s no play in the spindle etc. Everything’s been cleaned and oiled, dampers topped up... Car is running really well but bit of a nuisance when idling. thanks pete Link to comment Share on other sites More sharing options...
Mjit Posted June 8, 2021 Report Share Posted June 8, 2021 Double-check the butterflys are actually closing fully and properly. If they aren't you'll effectivly be at part throttle even with your foot off the gas. Give the whole carb/inlet manifold/breather pipework (but NOT into the carb mouths) a spray with Easystart. Nothing should happen but if you hear the RPM change you've got an air leak there somewhere. 1 Link to comment Share on other sites More sharing options...
Jeffds1360 Posted June 8, 2021 Report Share Posted June 8, 2021 Reminds me of my single CD150 on the 13/60. When I finally stripped the carb..... I found one butterfly screw missing !!! No idea how the P.O. had lost that! still never found it. This, naturally, caused high revs at tickover,..... search for an air leak. Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 8, 2021 Report Share Posted June 8, 2021 is the rocker cover letting air in or the filler cap is a poor fit plug the breathers tubes if that cures the idle then you know where to look pete Link to comment Share on other sites More sharing options...
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