2004 Bike Stalls After about 5 Miles

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yamaha2004r1 · Sat Sep 10, 2005 6:34 am

I just turned 8000 miles and had the 8000 mile service conpleted. The mechanic said that two of the spark plugs were really black. It seems they might not be getting enough power.

When the bike is cold and I first start the engine everything runs great. After about 5-10 miles the bike will start bucking a bit but will still run like a champ. When I come to a stop and pull the clutch in the bike stalls out. I can start it back up but I have to rev it up a bit to keep it from stalling until I get moving.

The bike itself only shows about 150-200 on the heat gage so I don't believe it is the bike over heating.

Someone mentioned there may be a magnetic coil which sends power to the spark plugs. When the coil heats up it stops sending enough power to the plug to keep the bike from stalling.

The bike shop I go to said "Uh, I don't know???".

2004 Yamaha R1

Please help with suggestions...

#2 Unread post by **9000white** » Sat Sep 10, 2005 6:56 am

was it stalling before the "mechanic" worked on it???

yamaha2004r1 · Sat Sep 10, 2005 7:07 am

9000white wrote:was it stalling before the "mechanic" worked on it???

Yes. It started right before I took it in to have the 8000 service. It happened on the way to work in rush hour traffic. I made it home that day and parked it until I could get it serviced. Got it from the shop yesterday and took it back to the shop today...

Aquaduct · #4 Unread post by **Aquaduct** » Sat Sep 10, 2005 12:56 pm

Well, let me start by suggesting another bike shop. This guy sounds like a moron.

I really don't know anything about the R1, but generically, motorcycle ignition systems shouldn't be such a mystery.

Many electrical components can develop failures that only show themselves when hot. One is the pickup coil, which takes a timing signal off the crankshaft. They are so notoriously unreliable on my Triumph that there is a guy on the web who apparently makes a decent side living just selling those components.

However, the 2 problem plugs should be a dead giveaway. Usually a bike will have 2 ignition coils that drive the spark plugs, one coil for 2 plugs.

Tell doofus to check out the ignition coils. Or better yet, spend your money on someone who at least knows more than I do.

ZooTech · #5 Unread post by **ZooTech** » Sat Sep 10, 2005 5:26 pm

Next time it happens, pop open your gas cap. It sounds like you may have a fuel feed problem, either from a plugged cap vent or a faulty vacuum-operated petcock.