I'm going to be fitting some phenolic gaskets to my carbs on the bay, as it doesn't like starting when hot and I think it could be heat transfer. I have never ever adjusted anything on my carbs, and might well strip clean and rebuild them and then set them up properly. Does anyone have a diagram or instructions on how to adjust them and set them up? Much love to anyone that does
Before you fit them make sure you adjust the throttle plates EXACTLY the same using a 008" feeler gauge between the plate and the carb body. You will also need to get or borrow a snail airflow meter to get the synced properly. Check all the jets are equal, though they should be. Then follow the redline instructions. They are pretty good. If you have the stock jets from Dellorto the jets may be wrong but see how you go. It is well worth taking the jets out and seeing what you are starting with. The F78 emulsion tubes are wrong for a type 1. They are prone to fuel boiling off after a run. Remember that the spacers will mess up your throttle linkage. Seen as you will have the carbs off it is well worth giving all the jets a good clean anyway. The choice of idle jets and emulsion tubes seem to make the biggest difference. If you pm me your email I can send you the pages for ICT's from the weber Tech book.
I have messaged you The jets and tubes are all changed, to ones I found were suitable from the samba, rebuilt the carbs them so they shouldn't need stripping or cleaning but it could be a good idea if they are off anyway. As for the linkage, I will adjust it all again anyway, it's all new bell crank and buttys bits that were fitted less than a month ago.
Definately is. The throttle pedal is a joy to use now. This combined with buttys bits linkage up front and a new multi strand cable made a huge difference. Just gotta sort engine end now. And we're away.
Might be a tad heavy on consumption with those mains. I settled on 140's, still got decent performance, but I can at least see over 450 Km's to a tank.
I too have 140 mains but with 160 airs. There are others that run 150/170's though. Be interesting to see if it bogs down a little as the pedal is pressed with the 150 mains. Were the jets chosen with a rolling road session?
We used the following on the 1641 type 1 motor: 145 main jets 55 idle jets 175 Needle jets 160 Air corrections F6 Emulsions Now we are on the 1911 type 4, Peter Burgess dropped the 145 mains down to 135's with the rest staying the same!
When using the intake gauge, which screw am I supposed to be adjusting? The throttle stop one? Or the mixture one?
From memory we used the balance gauge first, adjusting the mixture screw on each one and getting the same readings on the gauge for each carb. Once these where set up right we set the idles on each carb From memory that is
I was trying to understand all the instructions I had a couldn't really make heads or tales of them tbh I set the carbs with a feeler gauge inside the throttle flap. They wouldn't idle so have since been wound in the same amount each carb. I then wound the mixture screw out a turn, making it 3 from bottom to make it run smoother, then I could wind the idle back out a bit to lower it. I've driven it and started and stopped it and it runs quite well to be honest. Better than before. Idles better, smoother and it now actually seems to start from hot, no throttle just by cranking. So will check it all over tomorrow and put the carb balancer on etc.
Balance and set idle speed using gauge and throttle stops at idle with linkage disconnected. At the same time adjust mixtures and readjust balance if needed. You don't use gauge for mixture.
And mixture wise. Wind in until it runs Marmite. Then wind out until it runs Marmite. Then set in the middle?
Start off with both idle screws out 2 turns out. this will probable have it running too fast. Also the 008" feeler gauge set up will have it running too fast. wind each mixture screw in until you hear it begin to slow. Count the turns as you go and write it down. Once it slows turn it back out 1/4 turn. do the same to the other. Once this is done. set the idle speed to 850 - 900 rpm. use the snail gauge to get them both equal. The figure doesn't matter but they must be 10% equal. All this with the LINKAGE OFF. re attach the linkage and re check the air flow.
If your mixture screws have to go less than 1 turn from bottoming out then your idle jets are too big. If they are more than 2 turn out your idle jets are too small. Remember the seats for the mixture screws are VERY easily damaged and cannot be replaced so turn them in gently.
