my 1984 fj wont start when hot

[Arnie]

Musonee,

Take the starter off the bike, and open it up.  Clean all the crap from the bearings, check the brushes, clean the commutator and the grooves in the commutator if necessary, put new grease on the bearings and put it all back together.
You'll be amazed at how much quicker it will now spin.

Arnie

I have the same problem with my 84 FJ1100, with the difference that the fuel line is modified with a filter and a tap.
When the engine is hot, it runs slow (the starter is in good shape and the battery is new), looks like it gets tight.
If I let it go down hill on second gear it will start running immediately.
Thanks fore any help.

[Musonee]

Musonee,

Take the starter off the bike, and open it up.  Clean all the crap from the bearings, check the brushes, clean the commutator and the grooves in the commutator if necessary, put new grease on the bearings and put it all back together.
You'll be amazed at how much quicker it will now spin.

Arnie

I have the same problem with my 84 FJ1100, with the difference that the fuel line is modified with a filter and a tap.
When the engine is hot, it runs slow (the starter is in good shape and the battery is new), looks like it gets tight.
If I let it go down hill on second gear it will start running immediately.
Thanks fore any help.

Thanks for your tip. Guess I'll have to do that, the bike spend almost a year at the Yamaha shop, one of the things fore repair was the starter but maybe they forgot to check it. I think that was one of the reasons way I had to tow it to another mechanic shop to make it run, but that's another story.

   Andy

[Ratchet_72]

next time it does it , open one of the float bowl drains and see if fuel comes out. If no fuel you have a vapor lock problem or a fuel line routing problem.

What Mark says. In a big way.
I believe I've had this problem with both FJ's.

1) Do you have the heat shield installed still fore of the carb bank? If not, it WAS there for a reason.
2) Are you following the fuel routing diagram to a T? And I do mean EXACTLY. Feel free to alter that routing at your own peril. Many BAD things happen with those tight spaces under the tank and you can have pinched and really HOT hoses.
3) At one point I insulated my fuel lines with some hose wrap made by DEI. Worked for me...on more than one bike.