My fj1200 stalls/quits

[slipstream2000]

My 1200 runs great on a 1-2 hour ride then suddenly quits/dies.  8 - 10min later starts up again. Anyone else have this problem ?

slipstream

[FJmonkey]

My 1200 runs great on a 1-2 hour ride then suddenly quits/dies.  8 - 10min later starts up again. Anyone else have this problem ?

slipstream

Way too little information dude. What year is your FJ? 84 to 87 are gravity feed, 88 to 90+ are fuel pump. Different possibilities. What have you checked to diagnose the problem?

[FJ12ryder]

Have you checked the fuel cap air vent? They do seem to clog up regularly. If you can open the fuel cap and start up immediately then that's the problem Mine used to be a problem
when the tank got down about 1/2 way or so. It wasn't really a problem until then.

[FJ_Hooligan]

Check shit

[slipstream2000]

oppps  okay  1986 FJ1200 - 45,000 miles, bought it 3yrs ago from 2nd owner.  She was rough, went through & rebuilt the carbs, back wheel bearings were shot so replaced those, front shock seals, new rubber etc.  

Issue: Head out for a ride cruising along, 70 - 75mph and she just dies.  Pull off to the shoulder, 8 - 10 minutes or so later and she starts right back up again.  Tried starting her while waiting and engine turns over fine, wants to go just won't catch and fire up.  It does this consistently every time I take it for a ride.

Removed the coils & took them to a mechanic friend at a Yamaha dealer and tested them but of couse said unless they get up to operating temp where they fail (if that even is the problem) hard to diagnose.

Any idea's ?

[FJ12ryder]

Yep, fuel cap vent is partially plugged.

[slipstream2000]

Thanks, that is what I thought the first time it happened vapour-locked. Came to a stop, opened the fuel cap, closed it and nada wouldn't fire up.  Like i had the electrical cut

[FJ12ryder]

It sure sounds like that is what it is. You might check the fuel line the next time it happens to see if you have fuel flowing. The '86 has gravity feed so no fuel pump, but it does have the silly Yamaha low fuel system which can be a problem if you're very low on fuel.

[FJmonkey]

I have an 86' and have had a slew of issues recently. All fixed now.
1. Your fuel cap can get dirty and the flapper valves don't allow atmosphere in. Or like me and you did a dumbass thing, removing the flapper valves but put the plastic housing that held the valves in upside down. However, the valves are not likely your problem.
2. Fuel line improperly routed, easy to do as it is not intuitive. If you have your stock air box it will have an image that shows correct routing. Look closely at how the line comes out of the petcock, goes under the two split lines and then routes around the top of carb #3, then down. 
3. Your petcock has a vacuum leak like mine did. Perform the Suck Test. Search this site for instructions. I posted on this so that can narrow down your search.
4. Someone added a fuel filter, if so remove it.
5. Some tank bag pads can seal the cap.
6. Floats set too low.


And welcome, shoot over to the introductions section and tell us more about you and your FJ.

[TRoy]

 okay  1986 cruising along, 70 - 75mph and she just dies.  8 - 10 minutes or so later and she starts right back up   It does this consistently every time I take it for a ride.

when it dies..does it do so instantly..or can you feel it start running bad for a little while before you have to pull off?

[slipstream2000]

thanks FJ12Ryder, I'll give it a try

[slipstream2000]

No hesitation, just dies

[slipstream2000]

FJmonkey, been awhile since I've done any work on bikes, I'll check.  thanks

[FJmonkey]

No hesitation, just dies

If it was fuel delivery related then it would act like you ran out of fuel. Stars loosing power, crack the throttle open wider it accelerates, eventually you get nothing regardless of throttle position and you are coasting down the road till you stop. If the engine just cuts out with out warning then it will something electrical. Shorting kill switch, a shorting wire, etc... Do you loose all power to the bike, lights, indicators??? Or just the engine dies?

[Thmsdoyle]

Maybe a vent issue. Tank can't breath, fuel will stop flowing??