Confused! (421 serval)

[theputz]

From what I have been told previously if your exhaust changes color it is likely due to excessive heat. This seems accurate in my case as yesterday we did some riding and it was cool and damp out and in 8 degree Celsius weather my coolant managed to hit 120 degrees Celsius just playing on the hills, nothing excessive. The problem is when I look at the plugs they seem a little on the fat side if anything. Is it possible a lean pilot would cause this? I have been fighting a bottom end bog for awhile now.

[theputz]

you can see the blueish purple 10 inches from the cylinder and again at the stinger.

wouldn't say these are lean at all

[locogato11283]

What fuel and oil? What ratio?

[theputz]

108 octane mixed 32:1 castrol 927

[rjdgriff]

What carbs, jetting, altitude? Running to rich can make you over heat. I'm no jetting pro but this info will help others to help you. Also any porting and what other supporting mods?

 

 

Sent From My Trail Bike

[theputz]

165 main, dgh middle clip, 52 pilot. 3200 feet elevation. Ported.

[LaegerEliminator]

What sized carbs?

[Surfrjag]

And how much timing

[theputz]

39 pwks. 5 degrees.

[sleeper06]

I would say your electrical system is sub par in an area or two, plug should not look like that at a 165 main and it could be source of your bog

[locogato11283]

Those jetting specs are what a bike at sea level needs. That should be way too rich for 3200 feet.

[sleeper06]

I thought he was at sea level , even if not one or two jet sizes , those plugs are caked

[Surfrjag]

Is it sucking bowls dry?

Pingle valve or plugged vent cap?

[Larry's Shee]

Are those plugs from riding all day? Or from a single pull?

[theputz]

Plugs are at end of day. Have pingle. Don't think it's suckling bowls dry, runs strong up top