H/W5200 JETS/AIR CLEANER/REGULATOR/ADAPTOR PIX

[powerband]

Tech Portfolio - Holley/Weber 5200 Jet change picture guide:
http://photobucket.com/albums/v296/Powe ... ER%20JETS/

Have a great running 170 with a fresh "worked" head and running excellent with original YF carb.

I installed a H/W 5200 on a 2>1 adaptor ('Langdon's Stovebolt'). Initially carb jetting was stock 4cyl application and started and ran pretty good but bogged down and missed with 2bbl at WOT with RPM's under @ 2500.

I rejetted carb along the current FSP group guidelines (thanks Stang200) with mains @ 160/160, air bleeds @ 185/175, and the idles @ 075/065 (primary/secondary). I also added a fuel press. regulator as advised by Earle Parker of circle track carb fame. I 'modded' a 'Stang 250 RBS carb air cleaner for the Holley as well.

After re-jetting it runs great with good top end and smooth off-idle running BUT still bogs exactly same way if I'm under 2500 RPM and I wing throtle to WOT it just bogs and stumbles until it hits @ 3000 and then takes off toward 5500RPM real fast.

I believe the carb still has a problem but I am at a loss where to look for the solution.

Powerband 8) 8)

 

[MustangSix]

If the accelerator pump is working well, at this point the carb should be pretty close, so the problem might be ignition related, particularly timing.

Try advancing the timing a little to see if the bog goes away or gets better.