What kind of carb adjustment - Honda Shadow Forums : Shadow Motorcycle Forum

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Old 03-10-2010, 08:00 PM   #1 (permalink)
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Default What kind of carb adjustment

Anybody want to guess what kind of carburetor adjustment I might be looking at? My '84 VT700 was running mostly-well last Fall but I decided to clean the carburetor completely. When I got it assembled and back on, the bike wouldn't start--naturally. I tried spraying some starter fluid right in the carb and it started but soon died. If I sprayed more starter fluid just as it sputtered, it keep running. After only a couple minutes of this it would keep running by itself--no more starter fluid needed. I let it run for several minutes, shut it off, and restarted it a couple times. I was happy.

A couple days later I tried to start it again but the same problems resumed and I needed to give it starter fluid a few times. It would seem the carb takes awhile to feed itself. Does that sound like the float bowl is draining while it sits...or something?

Thanks.
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Old 03-10-2010, 08:17 PM   #2 (permalink)
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Default Re: What kind of carb adjustment

Quote:
Originally Posted by VT700-BD
A couple days later I tried to start it again but the same problems resumed and I needed to give it starter fluid a few times. It would seem the carb takes awhile to feed itself. Does that sound like the float bowl is draining while it sits...or something?
You didn't mention it so I have to first ask: Are you using the choke ??

It may be that your float level is just set a bit too low.
Or, like you said, there may be a leak.

It might be interesting to see how much comes out if you open the bowl drain after it has been sitting overnight.
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Old 03-16-2010, 04:46 PM   #3 (permalink)
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Finally back at it.
First off, no choke although I've played to see if it matters.
I ran it again for awhile then drained the float. Same amount in both sides. It almost fills a 35mm film cannister...what is that, 2oz?
After draining, it behaved the same and needed starter fluid to keep running. I'll let it one day then see what's left in the float bowl.
Thanks!
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Old 03-16-2010, 06:19 PM   #4 (permalink)
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Quote:
Originally Posted by VT700-BD
First off, no choke although I've played to see if it matters.
It WILL matter. Use it.

Beyond that, I think the odds are high that something is not right inside the carb.

Which explains the old saying: If it ain't broke, don't fix it !!
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Old 03-16-2010, 11:58 PM   #5 (permalink)
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You haven't said how well the bike runs once you get it started and it warms up. Assuming it runs normally when warm, it would seem that you're just not running a rich enough mixture when starting. I think Easy's on the right track. Maybe you got some crud in a jet, or maybe you did something to the choke.
Did you adjust the choke after putting the carb's back on? I made the mistake of doing that. Honda's instructions say to adjust the choke by screwing the cable in or out where it connects to the choke lever. I (now) don't think it's possible to do that without breaking the cable. You've got to remove the cable end from the lever or you just end up twisting and fraying it.
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Old 03-17-2010, 11:22 AM   #6 (permalink)
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After letting it sit one day, there was about the same amount of fuel in each float bowl.
It runs pretty well after getting "fueled up", whatever that means. There's hesitation when I give it more throttle but I figured that was further adjustment needed after I get it to start effortlessly.
Yeah, I think there's some problems with the choke--too. As long as I've had it the choke doesn't move well. It seems it only slide about half the distance it should. When I had it apart, the spring on one side looked mangled and sort've collapsed onto the cable. I've been considering changing it. Maybe that's keeping me from adjusting it. However, the choke cable's only bad on one side yet both carbs seem to need nursing before the engine runs on its own.
Thanks for your comments!
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Old 04-01-2010, 08:33 PM   #7 (permalink)
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Default What kind of carb adjustment

It seems to be working. I pulled the choke cables and inspected them. At the valve end there was a mismash of springs were one-each was expected. On one side 2 small springs were intertwined. On the other side, again 2 springs but one was much longer and actually fit over the whole value. I lubed the cables, worked out a matched set of springs, installed and adjusted them. It's still tight but seems to have an effect.
I don't know if it mattered but I replaced the battery too. Remember, it started with a squirt of starter fluid so I don't think the battery was solely responsible. I think it was all a choke problem.

Funny new problem. The tank and seat have been off so long it seems like they don't fit anymore! Actually, I think something's sitting too high to allow the tank's side bolts to align. Everything looks tight and low but the tank sure won't line up. Oh well!
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Old 04-01-2010, 08:38 PM   #8 (permalink)
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i just had the seat off my 84 about 30 mins ago... they take a bit of coaxing to get them on.. push down on the front of the main seat.. and push forward from the back of the seat.. it will go with some pressure..
same sort of idea for the rear seat..

-Jeremy
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