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scrivyscriv
Samba Electrician
Joined: October 04, 2011
Posts: 2922
Location: Memphis
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 Posted: Wed Oct 19, 2016 10:19 am Post subject: H30/31 carb on 1641cc hard to adjust |
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1641cc dual port engine, rebuilt by me last year about 8k miles ago.
 aftermarket stock heater boxes
header and bugpack muffler, about 1-3/8"?
H30/31 carb, 'rebuilt' with carb kit same time as engine build
Bosch/VW 205T vac-only distributor, rebuilt but not spec'd on a machine
The problem is I can't seem to lean the idle mixture out enough, and the idle speed (volume) doesn't have much of a range either. Sorry, I don't have a mixture meter so I don't know what it's actually doing, but as I tighten the mixture screw I hear the idle increase slightly and then the screw bottoms out. I am expecting RPM to increase as I lean the mixture, find where it leans to a miss, and then back the screw off to just rich of peak.. but I can't lean it that much.
Can anyone help me figure it out?
I put on a new aftermarket stock type bus muffler this spring and actually was able to get a little better adjustability, but now that I put my header/muffler back on, I'm having the same problem again with idle speed and mixture. If I remember correctly it's a 55 and a 60 idle jets.
It seems to run well at speed, I think I have a 120 main.
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Robert in Memphis
Dünkelgrügen 1967 Java Green bug thread
Engine rebuild thread
If you're ever in the Memphis area, you are welcome to stop by for advice and help. |
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Slow 1200
Samba Member
Joined: July 02, 2004
Posts: 2105
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| Posted: Thu Oct 20, 2016 4:35 am Post subject: Re: H30/31 carb on 1641cc hard to adjust |
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| how open is the throttle plate at idle? |
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scrivyscriv
Samba Electrician
Joined: October 04, 2011
Posts: 2922
Location: Memphis
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| Posted: Thu Oct 20, 2016 7:40 am Post subject: Re: H30/31 carb on 1641cc hard to adjust |
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The fast idle screw is set to spec but I haven't measured the gap at the plate.
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Robert in Memphis
Dünkelgrügen 1967 Java Green bug thread
Engine rebuild thread
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scrivyscriv
Samba Electrician
Joined: October 04, 2011
Posts: 2922
Location: Memphis
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| Posted: Mon Oct 24, 2016 7:53 pm Post subject: Re: H30/31 carb on 1641cc hard to adjust |
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Found it, my fuel level was set too high and the needle was intermittently sticking open or closed. Amazing what a difference a few mm of fuel makes!
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Robert in Memphis
Dünkelgrügen 1967 Java Green bug thread
Engine rebuild thread
If you're ever in the Memphis area, you are welcome to stop by for advice and help. |
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Zundfolge1432 
Samba Member
Joined: June 13, 2004
Posts: 12467
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| Posted: Tue Nov 01, 2016 4:30 pm Post subject: Re: H30/31 carb on 1641cc hard to adjust |
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| That yellow sticker on the coil is installed upside down, won't help how engine runs but. |
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scrivyscriv
Samba Electrician
Joined: October 04, 2011
Posts: 2922
Location: Memphis
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| Posted: Tue Nov 01, 2016 5:05 pm Post subject: Re: H30/31 carb on 1641cc hard to adjust |
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Lol, you're far from the first person to tell me!
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Robert in Memphis
Dünkelgrügen 1967 Java Green bug thread
Engine rebuild thread
If you're ever in the Memphis area, you are welcome to stop by for advice and help. |
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