Bike dies after start. - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 2 (permalink) Old 08-09-2012, 10:01 PM Thread Starter
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Exclamation Bike dies after start.

I'll start from the beginning. I am a new to motorcycles and decided I wanted to purchase a bike. Found a 2001 vn750 on craigslist so I went to check it out. I liked it so bought it. Before the purchase I asked the guy to turn the bike on and off, ride it around, rev the engine etc. It worked flawlessly that day.

Once I brought it home that's where the bike started to have issues. First issue next day was the bike wouldn't start, I heard the clicking sound but the engine just wouldn't start . I had a mechanic I knew take a look at it . He rebuilt the carburetor said it was flooded. The bike worked no problem that day. Then the next day it wouldn't start again so I changed the battery and that seemed to fix all the issues. The day after that it started leaking gas. I had a suspicion that the fuel gas switch was faulty so I had the mechanic replace that as well. Bike ran for the whole day no problem and had no issues starting or stalling. But it would randomly shoot to 4k rpms when starting or even when in 3d gear when riding while the clutch pulled in. Also I tried adjusting the rpms manually to 1100 while idle and the bike just cant hold it that low, it dies. If i kept it at about 1600 rpms idle it seemed to stay on.

Now the bike starts,. If i release the trottle the bike just dies.
but only if I keep holding the starter button down and the throttle all the way to full for like 10 seconds. As soon as I release the throttle bike dies. BTW in the video when I start it the first time my hand is not on the throttle at all, the bike revs to 4k rpms by itself. Link to video me starting the bike

I suspect that the carburetor is somehow messed up but I wanted your opinion before I shell out $$ getting a new carburetor or having it taken apart again. Also I was thinking maybe trying seafoam? Thanks.
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post #2 of 2 (permalink) Old 08-09-2012, 10:31 PM
1986 VN750
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It could be a number of things.

It definitely points to the carburetors. One thing is they could not be seated properly, allowing causing a lean condition, thus the spiking rpms.

Could be a float issue? Sticking (the flooding) or way incorrectly adjusted?

You can leave the petcock set to "ON" without an issue. it's vacuum operated, so should only pull gas when the bike is on. My fuel gauge shows 100% full at around 80%. If my gauge shows half I get gas, usually. It likes to drop quickly from half for me.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars

1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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carburetor , dies , idle too high , wont stay on

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