84 Shadow stalls with throttle - Honda Shadow Forums : Shadow Motorcycle Forum

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Old 10-09-2011, 05:02 PM   #1 (permalink)
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Default 84 Shadow stalls with throttle

I have a 84 700c shadow that I have just pulled and cleaned and now reinstalled the carbs. Prior to this the bike wouldnt start at all. Now I can get it to start but only if the choke is fully engaged (twisted all towards me). If I give it any throttle it dies. It wont start and idle without the choke on even with it warm. Any thoughts? I am sorta new at motorcycles but not mechanics and I have been reading through these forums for most of my info, I just couldnt fined this issue covered anywhere. Thanks for any help you can give.
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Old 10-09-2011, 08:02 PM   #2 (permalink)
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Put your air filter back on.

John.
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Old 10-09-2011, 08:19 PM   #3 (permalink)
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I assure you my airfilter is on
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Old 10-09-2011, 09:23 PM   #4 (permalink)
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not sure about the vacuum line for that model, but I would check to make sure you have no vacuum leaks, intakes, vacuum slide diaphram, air box, but it sounds like your not getting enough fuel. pilot and jets cleaned correctly and installed? are your float levels good? are you getting enough fuel to the carbs? any leaks on the intake side will cause bogging and stalling when throttling, but should not cause the lean idle. leaks on the manifold side will cause the lean idle.
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Old 10-09-2011, 11:24 PM   #5 (permalink)
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what do you mean by leaks? Are you talking about the carb boots? I pulled the two jets from the carb and cleaned them until I could see light through them so I think they should be good. The diaphrams looked good with no holes of any kind. The rubber boots that hold the carbs in place looked fine, no cracks or anything that I could see. I checked the floats per the manual and made sure they sat at 7.5mm from the surface of the carb. When I open the box that holds the airfilter and pull out the airfilter while its idleing nothing changes, so i am pretty sure it is not a lack of air on the intake side. What can I do to richen the mix? Or is there another or better test here?
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Old 10-09-2011, 11:48 PM   #6 (permalink)
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That had duel carb set up? when you clean the pilot jets it also has little holes in the sides at the longer smooth end, make sure thier clean, the main jets are the smaller jets, so there should be 4 that need to be cleaned, 2 per carb. also the passages that they feed fuel to need to be cleaned. the idle screw should be removed and those passages cleaned as well. needle seat passage cleaned out? idle screws turned out 2 1/2 to start with.
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Old 10-10-2011, 07:26 AM   #7 (permalink)
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Quote:
Originally Posted by Scrapdog2grand View Post
when you clean the pilot jets it also has little holes in the sides at the longer smooth end, make sure thier clean, the main jets are the smaller jets, so there should be 4 that need to be cleaned, 2 per carb. also the passages that they feed fuel to need to be cleaned. the idle screw should be removed and those passages cleaned as well. needle seat passage cleaned out? idle screws turned out 2 1/2 to start with.
+1.

Yes scrap, that's a dual carb bike.

Idle jet's (pilot) are difficult to clean, correctly and efficiently. Check them again.
Did you remove/clean the slide's? If so, were you careful to not pinch the diaphragm's?

Yes, Air filter is important on this bike, .... for correct operation, so it's a quick response to questions on running conditions.

Opening throttle cause vacuum to open slide's, not just the cable going to the "butterfly". Slide opening (moving up) raises needle from Main Jet, allowing fuel into "airstream" of intake system.

Pilot jets allow fuel into "stream" differently, hence PART of your problem.

"Choke" (enricher) is still yet, totally different. THIS part on your carbs is the only one that's OK, probably.
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Old 10-11-2011, 12:10 AM   #8 (permalink)
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I will pull the carbs again this week and re clean with more attention to the openings I take the jets out of. Also, there was a metal tab inside one of the carbs off to one side that was not in the other carb. It seemed like it restricted flow to an open area above but Im not sure what it is or what it does or rather if it is relevant to this issue. Thanks for all your experience, I am really grateful to have you all to ask this stuff.
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Old 10-15-2011, 07:19 AM   #9 (permalink)
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Quote:
Originally Posted by John Hopkins View Post
Put your air filter back on.

John.
Would the air filter affect the choke "opening" up all the way?
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Old 10-15-2011, 07:48 AM   #10 (permalink)
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One more thing to consider since you mentioned you are "sorta new" at motorcycles. The pilot jets are not accessible unless the side of the carb has been drilled out. When I first cleaned the carbs on my 83 VT500C, I did not touch the pilots since I was not confident enough to take a drill to them. The bike would only run on choke and would die if I gave it throttle. Ended up taking it to the shop for cleaning and that fixed it.
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