Old SU HS2 carby
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| Just cant get it to go... poor DOT https://www.ausmini.com/forums/viewtopic.php?f=2&t=10473 |
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| Author: | roothj [ Wed Aug 24, 2005 11:20 pm ] |
| Post subject: | Just cant get it to go... poor DOT |
Hello everyone. Ive had my mini now for a few years and now have time to spend on it and just cant get it to go. I purchased the car off of a guy whilst it was in bits and have put it together but just cant get it to purrrr. The car starts straight away with the help of the choke out but it just doesnt want to settle down. My main concern is that when it "idles" is accelerates by itself, then slows down... accelerates then slows down. I am no motor mechanic nor am I a mini expert.. Im just a computer guy who loves his little car and want to get it running... so if some of the wording is incorrect or if I sound like I dont have a full idea.. then thats why. Anyhow... the cars a 196x morris mini saloon.. with a 1098 (non original) engine. It has a 23D4 dizzy and I have had the head converted to unleaded. It has a 1 1/2" carby which has a h6 needle and I have taken this into some mini places to see if it looks ok and they say it "looks" fine. I have replaced the needle and seat and float in the carby... I have replaced the block/manifold gasket.. all of the gaskets (3) between the manifold and carby.. and have tightened everything up as per the manual. I have replaced the inspection plate gaskets and rubber seal as this did have a leak. I know that the exhaust has a leak where the manifold meets the exhaust pipe but have plans to put on extractors and a new exhaust once the motor runs. I have had a mate (who is into cars) look at the motor... he adjusted the dizzy from scratch.. checked the gap. I have replaced the spark plugs too.. and distributor cap and leads. I havent replaced the rotor. I have played around with the mixtures on the carby but nothing seems to make any difference... the motor still runs slow and fast slow and fast. Does anyone have any ideas? Im at a loss. Thanks Jason |
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| Author: | Chris [ Thu Aug 25, 2005 12:24 am ] |
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What model carby? Is it a late model or an old one? |
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| Author: | roothj [ Thu Aug 25, 2005 1:57 am ] |
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Old SU HS2 carby
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| Author: | h0nk [ Thu Aug 25, 2005 6:27 am ] |
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What happens when you rev the engine? Can you hold it at a certain rpm, without it accelerating and slowing down then dying out? |
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| Author: | roothj [ Thu Aug 25, 2005 8:27 am ] |
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When I rev the engine it goes to stall - similar to if I cover the end the carby with my hand. |
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| Author: | GT1360 [ Thu Aug 25, 2005 8:42 am ] |
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does the damper inside the dash pot move up and down ok? or is it stuck? |
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| Author: | Rodney [ Thu Aug 25, 2005 8:42 am ] |
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G'day, I'm no mechanic either, but if it stalls when you put your foot on the accellerator, I think that's petrol starvation. Maybe check the fuel pump, fuel lines, fuel filter. The good doc will know what the problem is straight away - he will no doubt answer your post sooner or later. Cheers |
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| Author: | gafmo [ Thu Aug 25, 2005 8:50 am ] |
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I would first check the fuel filter Could also be no oil in the dash pot |
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| Author: | J_A_M [ Thu Aug 25, 2005 9:17 am ] |
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you are on the right track, by fixing / changing things..... but I think it's a vacuum leak somewhere. |
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| Author: | poeee [ Thu Aug 25, 2005 11:32 am ] |
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Have you been running it with an air cleaner? Carby's tuned with an air cleaner will run to lean without one. |
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| Author: | roothj [ Thu Aug 25, 2005 11:59 am ] |
| Post subject: | |
>>Does the damper inside the dash pot move up and down ok? or is it stuck? The damper moves with ease... cleaned out the damper pot etc and all seems to be working nicely. A mate of mine who works with motor bikes which have a similar carby checked it and said it is fine. It seems to move nicely up and down the pot... doesnt stick and doesnt drop rapidly. >>Could also be no oil in the dash pot The way I added the ATF was to smuther the nib of the thing on top of the dash pot. I was told this would be enough. I used ATF and not oil... >Maybe check the fuel pump, fuel lines, fuel filter. >Would first check the fuel filter I cleaned out the fuel tank with metho? and got rid of most of the junk from it. Added a new fuel filter I see fuel in the filter and it never becomes empty...seems to be working. I tried to buy a fuel pressure gauge but couldnt get a t-piece for it so I got my money back. >>but I think it's a vacuum leak somewhere. Yeah I thought the same thing... so I changed most gaskets... is there another place the leak could come from? >>Have you been running it with an air cleaner? I havent had the air cleaner on... bought a new one.. but never tried to start it with it yet. |
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| Author: | GT1360 [ Thu Aug 25, 2005 12:07 pm ] |
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hmmm. i would just look over the carby again. make sure the needle and jet are moving the way they should. how about you fuel bowl level? check that. when it stops take the plugs out and see if its flooding. aslo what plugs you got in there? where is your starting mixture setting? Vac advance on the distributor to carby? |
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| Author: | roothj [ Thu Aug 25, 2005 12:30 pm ] |
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>>I would just look over the carby again. make sure the needle and jet are moving the way they should. Is there a right way to do this ? >> How about you fuel bowl level? check that. Besides opening the fuel bowl and looking inside it... is that what you mean? I'll do that tonight to if thats the case. >>When it stops take the plugs out and see if its flooding. aslo what plugs you got in there? The plugs arent black not white they seem to be fine. Its only when I enrich the mixture to much when they go black - or when it floods. I'll get you the plug specs tonight but I am trying the the BP6xx and NY?? ones. Cant remember the exact type.. I'll update this tonight. >>Where is your starting mixture setting? Ive tried it at 6 flats, 11 flats and 14 flats. >>Vac advance on the distributor to carby? The 23D4 distributor doesnt have the vacuum advance. |
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| Author: | fuzzy-hair-man [ Thu Aug 25, 2005 12:46 pm ] |
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I'd be checking the timing again with a timing light (what do you mean by "adjusted the dizzy from scratch" ? ) staticly set timing can be out a fair bit, If I remember rightly incorrect timing can cause the motor to surge then slow as you are describing. You have the leads connected up the right way firing order 1-3-4-2 ? I can't remember which way the dizzy turns anyone? think it's anti clockwise 
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| Author: | GT1360 [ Thu Aug 25, 2005 12:47 pm ] |
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I will have to look in the book at home for the float level in the fuel bowl. yes you will have to undo it. I think the standard setting is 2 1/2 flats.. so you are way out there. 
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