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Old 08-18-2008, 01:49 AM   #1 (permalink)
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Unhappy engine bogging under load

Hello everyone,
I am new to this forum but there is a lot of great info thanks. I've read every related post but havn't solved our problem yet. My son recently bought an awsome 87 sammy project which runs great at idle but boggs intermitantly when you try to drive. Ocassionally it will drive ok for a block or two but then will bog out severly or die all together. The person we bought it from said it needed a carb. At this point cash is low however we have a parts vehicle and have tried several things with this resource. Things we've tried: we have put two other used stock carbs on, chokes operated well however the fuel level in the sight glass was at the very top that may be normal? Anyway same performance. Checked for vacuum leaks with carb cleaner none found. This led me to believe maybe not the carb. Bypassed the fuel tank and filter no change. Tested the new looking fuel pump: it pumped a pint of fuel in less than 30 seconds, and maintained the proper vacuum on the suction side. Thought maybe its restricted exhaust. Did vacuum test Vac fairly steady at 20. Vacuum increased as we brought up to 2500rpm no decline unless it bogged, if I just held the throttle steady it would catch up and vac would go back up. On to the ignition. Maybe weak or intermitent spark? Changed plugs, cap wires and rotor good. Vacuum advance tested bad. We had another used distributer(vac advance good) and coil so we changed them out and set the timing (it was 10 out (0) when we checked it before we changed the dizzy). No change!!! UGH!!! Maybe it really is the carb but 3 doing the same thing? I've read alot of folks say the stock carbs are great when they are working well but when they start messing up they're junk? No dough for a new weber. I've rebuilt quadrajets before are the Hitachis anything special? My next step would be to get a kit and rebuild. Are their any special tricks for this carb? I know this is a looong post but I'm out of ideas and would sure appreciate your help. My son's a bit discouraged and bugging me to death to get it driveable!! Help! and thanks.
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Old 09-07-2008, 04:17 AM   #2 (permalink)
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Default hi

Ok sorry about spelling but I think it might be vacuum problem check inlet manifold for holes and check gasket hope it fix it
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Old 09-08-2008, 02:59 PM   #3 (permalink)
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Checked that no problems. Vacuum at 22 but a bit erradic. Thanks for the reply though I was really getting bumed that no one was helping us out... Come on all you great zuki mechanics! Surely you have some experience and ideas we can try, I'm all out.
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Old 08-30-2009, 11:58 AM   #4 (permalink)
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Hi If Yuo Already Fix The Problem Let Me Know How To Because I Have The Same Problem And I An Runing Of Ideas , I Had Change The Carburator ,the Ignition Coil And The Distributor But Still Not Working Fine
Thanks
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Old 02-18-2010, 10:17 PM   #5 (permalink)
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Default same on my 88.5

It idles normal for a carb. But when the problem arrises on takeoff. When I let off the clutch in gear, it seems to starve for fuel/ bogg out/ cut out. Mash the clutch back in and normal idle. I can rev it up in neutral or with the clutch depressed and its fine. It acts up in any gear. I have had to feather the throttle to get home a couple of times now. But it doesnt do this all the time, just intermitterntly. I have a new fuel pump, cap , rotor and cleaned the tank. Still occurs.
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Old 02-18-2010, 11:04 PM   #6 (permalink)
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it sounds like you have your vacuum hoses routed incorrectly or the plugs for the VSV's may be switched around. The vacuum hoses are a crazy nightmare to figure out and if you have them hooked up incorrectly or if you have a regulator on backwards then it will foul the whole thing up.

I had an issue a few years ago when I accidentally swapped the connector for the secondary throttle plate VSV with the connector for the idle up VSV. The connectors look identical and the only way you can tell the difference is by pulling the boot back and looking at the wire color. In my situation, the idle was erratic because it was kicking in the secondary when it needed to bump up the idle. When I was under load with the peddle down, instead of the secondary opening, it just bumped the idle plunger... which did nothing but flood the carb and bog it down.

Double and tripple check your vacuum hose routing and make sure the rubber is fresh enough to make a tight seal. Make sure you have a good seal with the Dizzy advance.

Last edited by Baratacus; 02-18-2010 at 11:06 PM.
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