Runs fine till engine warms up, then sputters

[Piediddy]

Guys bike runs fine for about 10 minutes till engines gets warmed up. Stock motor good compression, stock carbs jetted to fmf specs, +4 timing, fmfs, and K&N pod filters. Kinda feels electrical to me. What y'all think? Any help is appreciated.

[Finch]

"jetted to fmfs specs" have ya looked at the plugs to make sure its not to rich or lean?

[RagunCajun]

pick up gap on the stator(check with a feeler gauge) or float level may be the issue.

[Piediddy]

I'm already down from a 260 main to a 240. Pilots are 30 should I try 27.5? Plug does look a little rich. I do need to check pick up gap. I got the bike from a buddy of mine and it sat for a while. After it cools bike runs fine again for about 10 or 15 minutes till it warms up again.

[Sandking]

Double check your electrical ground. A lose ground caused these symptoms on one of my bikes

[Infamous039]

More than likely electrical issue maybe cdi box or coil

 

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[joey83]

Cdi? Mine did that last summer. After it got warm woukd sputter and even die. It was the cdi

[7211]

could be cdi or bad stator my buddys 485 did the same thing an it was the stator if you let it sit for 15 min would run fine for a min or less untill it warmed up then would act like it was loaded up agin

[dirtydownunder]

could be plug caps or wires. ohm the plug caps.

[hoppedupandcutdown]

I've also had just old spark plugs do that.

[dave5.0]

Fix the electrical issue if that's it, then recheck your plugs. Jetting sounds lean with pods. Depends where you are too I guess.

[Piediddy]

I finally got a chance to work on the bike. I put one of those inline coil tester in place between plug and coil wire. Sitting on bike the left side cut out so bad the inline tester wasn't even lit up, also I noticed the left pipe wasn't half as hot as the right side?

[tdod101]

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