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72SilverBullet
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Joined: May 06, 2010
Posts: 92
Location: Belle Mead
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 Posted: Mon Jun 06, 2016 8:26 am Post subject: Weber IDF 44, fresh rebuild but still not working properly |
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| Just rebuilt my dual 44s. They are Italy made and are in clean shape. I bought the Redline rebuild kits from SoCal imports and did the job in a few hours. Blew out all ports with carb clean and compressed air. One carb works well. One does not. The 1&2 cylinder carb mixture screws are unresponsive, screw in all the way and no difference in idle. This was the reason I did the carb rebuild. Now on top of that issue the carb seems to be washing down the #1 cylinder. Fuel is leaking from my exhaust pipe. Anyone know a fix for this? Possible stuck float? Thanks! |
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stan_tichomirov
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Joined: May 24, 2005
Posts: 1719
Location: San Francisco, CA
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| Posted: Mon Jun 06, 2016 8:38 am Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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Stuck float or bad inlet valve is what I'd check first. When the bowls are full of fuel, if try to blow into the fuel line do you feel resistance?
Stan
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72SilverBullet
Samba Member
Joined: May 06, 2010
Posts: 92
Location: Belle Mead
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| Posted: Mon Jun 06, 2016 8:42 am Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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| stan_tichomirov wrote: |
Stuck float or bad inlet valve is what I'd check first. When the bowls are full of fuel, if try to blow into the fuel line do you feel resistance?
Stan |
I would have to check, the kit came with a new inlet valve so I did use it. Doesn't mean it was any good though. |
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raul arrese
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Joined: July 23, 2006
Posts: 1338
Location: miami florida
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| Posted: Mon Jun 06, 2016 8:48 am Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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Its not just about installing new needle and seat , its about making sure its closing off the fuel at the correct level ...
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stan_tichomirov
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Joined: May 24, 2005
Posts: 1719
Location: San Francisco, CA
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| Posted: Mon Jun 06, 2016 8:48 am Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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Did you set the floats to 10mm with the gasket in place?
I think I'd try the blow into fuel line test -- easy enough to do without removing the carb, and I think it should work..
Stan
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72SilverBullet
Samba Member
Joined: May 06, 2010
Posts: 92
Location: Belle Mead
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| Posted: Mon Jun 06, 2016 8:56 am Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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| stan_tichomirov wrote: |
Did you set the floats to 10mm with the gasket in place?
I think I'd try the blow into fuel line test -- easy enough to do without removing the carb, and I think it should work..
Stan |
No I didn't, I will have to check the measurement, any reason why the mixture screws are doing anything? related issue? |
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stan_tichomirov
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Joined: May 24, 2005
Posts: 1719
Location: San Francisco, CA
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| Posted: Mon Jun 06, 2016 9:08 am Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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I think if the bowls are overflowing, fuel will leak out the auxilary venturi -- your idle mixture screws won't help.
Stan
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porkchop-rob
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Joined: April 28, 2015
Posts: 454
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| Posted: Mon Jun 06, 2016 9:15 am Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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| 72SilverBullet wrote: |
| stan_tichomirov wrote: |
Did you set the floats to 10mm with the gasket in place?
I think I'd try the blow into fuel line test -- easy enough to do without removing the carb, and I think it should work..
Stan |
No I didn't, I will have to check the measurement, any reason why the mixture screws are doing anything? related issue? |
Your overflowing the bowls and its drowning. Set the floats correctly then gently close them and blow in the fuel inlet, making sure the valves are seating and shutting off the fuel flow.
Also, what kind of fuel pump and fuel pressure? You could simply have too much pressure and be over powering the needle valve.
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72SilverBullet
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Joined: May 06, 2010
Posts: 92
Location: Belle Mead
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| Posted: Mon Jun 06, 2016 9:48 am Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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| Just the stock fuel pump, no regulator. |
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72SilverBullet
Samba Member
Joined: May 06, 2010
Posts: 92
Location: Belle Mead
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| Posted: Mon Jun 06, 2016 5:51 pm Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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| Just set float height. Doesn't seem to be leaking fuel out of exhaust any longer but the mix screws are still doing nothing. |
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udidwht
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Joined: March 06, 2005
Posts: 3804
Location: Seattle, WA./ HB, Ca./ Shizuoka, Japan
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| Posted: Mon Jun 06, 2016 11:50 pm Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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| 72SilverBullet wrote: |
| Just set float height. Doesn't seem to be leaking fuel out of exhaust any longer but the mix screws are still doing nothing. |
If you had excess fuel you also likely have fuel fouled plugs. Swap in new plugs. Be absolutely sure your fuel pressure is under 4psi with IDF's.
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72SilverBullet
Samba Member
Joined: May 06, 2010
Posts: 92
Location: Belle Mead
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| Posted: Tue Jun 07, 2016 1:04 pm Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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| Yea going to check fuel pressure, plugs and for vacuum leaks tonight. |
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ps2375
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Joined: April 24, 2014
Posts: 2523
Location: Meridian,ID
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| Posted: Tue Jun 07, 2016 8:37 pm Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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| Did it work before you rebuilt them? |
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72SilverBullet
Samba Member
Joined: May 06, 2010
Posts: 92
Location: Belle Mead
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| Posted: Wed Jun 08, 2016 7:44 am Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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| ps2375 wrote: |
| Did it work before you rebuilt them? |
Nope, its the reason I rebuilt them, one carb worked out of the box and this one did not. Bought them second hand through the classifieds here.
Engine runs decent just has hesitation issues under load while driving. Finding that dual carbs are tricky because the side not working correctly uses the good side as a crutch. If this were a single carb it probably wouldn't even idle at all, and run way worse. |
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72SilverBullet
Samba Member
Joined: May 06, 2010
Posts: 92
Location: Belle Mead
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| Posted: Wed Jun 15, 2016 8:56 am Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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| Fuel pressure regulator should be coming in the mail today. Does anyone know what size jets would be best for my application? 1915CC, 120 cam 40/35.5 heads, stock rockers and 4 into 1 header. Currently have 160 mains, 50 idles and I believe a 190 or 200 air. Thanks! |
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HRVW
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Joined: May 01, 2011
Posts: 2531
Location: Rosarito, Mexico
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| Posted: Wed Jun 15, 2016 11:32 am Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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| 160 Mains?.....try a 125-135 as a starter and a 200 Air |
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72SilverBullet
Samba Member
Joined: May 06, 2010
Posts: 92
Location: Belle Mead
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| Posted: Thu Jul 07, 2016 5:57 am Post subject: Re: Weber IDF 44, fresh rebuild but still not working properly |
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I went with 135 mains, F11's and 200 airs. Turns out I had F7s made for much larger engine. I may one day try the 140 mains and 190 airs, or if anyone else has any recommendations please let me know. It runs much better than before though, hesitation is nearly gone.
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