dombanks Posted January 20, 2022 Share Posted January 20, 2022 If you’ve ever wondered this, or just fancy wasting 15mins watching something you already know this interesting video popped up on my farcebook feed 2 1 Quote Link to comment Share on other sites More sharing options...
Richard (OldStager) Posted January 20, 2022 Share Posted January 20, 2022 I found out the hard way and fitted stupidly large chokes in Dellorto's 30 odd years ago, then wondered why it would not run till 4000 RPM.... I was unaware of airspeed in those days 😆. Quote Link to comment Share on other sites More sharing options...
Jim RS Posted January 20, 2022 Share Posted January 20, 2022 I've been repairing 4s/2s carbs since the 70's and know a fair amount of details for their operation/failings, but this video is amazing at showing how the petrol droplets form and are then atomised to produce good detonation. Saying that a lot of the engines I worked on could have run with a direct tube as they were so basic and worn🤪. One of the tests we did was blowing air from the intake side and checking that the fuel distributed properly, a bit risky with actual fuel but fun doing it. Quote Link to comment Share on other sites More sharing options...
Richard (OldStager) Posted January 20, 2022 Share Posted January 20, 2022 My very first dealings with carbs were in the early 80's, on an old moped. Thinking I would make it go faster I removed the airbox and filter... Top speed had been 30mph, now modified it went 25 Thankfully I am far wiser - I think. Quote Link to comment Share on other sites More sharing options...
Nemesis Posted January 20, 2022 Share Posted January 20, 2022 1 minute ago, OldStager said: My very first dealing with carbs were in the early 80's, on an old moped. Thinking I would make it go faster I removed the airbox and filter... Top speed had been 30mph, now modified it went 25 Thankfully I am far wiser - I think. I can see and know how you would achieved such results..... been there done that, even set fire to a small corner of the thankfully brick-built outbuildings at home..... I've still got a box full of 1980's MINKUNI carbs for FS1E mopeds....... they are so basic yet worked so well, I suppose that's the Japanese engineering ! Quote Link to comment Share on other sites More sharing options...
Richard (OldStager) Posted January 20, 2022 Share Posted January 20, 2022 1 minute ago, Nemesis said: I can see and know how you would achieved such results..... been there done that, even set fire to a small corner of the thankfully brick-built outbuildings at home..... I've still got a box full of 1980's MINKUNI carbs for FS1E mopeds....... they are so basic yet worked so well, I suppose that's the Japanese engineering ! Oh wow Mikuni carbs, yes,forgot about those , Honda used those a lot back then or was it suzuki?, passage of time fades my small brain... Quote Link to comment Share on other sites More sharing options...
Nemesis Posted January 20, 2022 Share Posted January 20, 2022 I came across them on Yamaha FS1E's. Quote Link to comment Share on other sites More sharing options...
Richard (OldStager) Posted January 20, 2022 Share Posted January 20, 2022 Never had Yamaha's but did mess with Mikuni's on something, CB750 and maybe the 550, that was a long time ago. Quote Link to comment Share on other sites More sharing options...
MR.C Posted January 20, 2022 Share Posted January 20, 2022 First time I've seen these....... Quote Link to comment Share on other sites More sharing options...
DIY-Si Posted January 21, 2022 Share Posted January 21, 2022 They look good, but are hilariously expensive. I put some on my Christmas list! Quote Link to comment Share on other sites More sharing options...
SootySport Posted January 22, 2022 Share Posted January 22, 2022 On 20/01/2022 at 14:08, dombanks said: If you’ve ever wondered this, or just fancy wasting 15mins watching something you already know this interesting video popped up on my farcebook feed Just goes to show, Dads know best. 1 Quote Link to comment Share on other sites More sharing options...
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