Track day observation

[Leskid]

Hi all

I took the scoot to the track the other day and stripped her naked so in the unlikely event of a spill, I'd at least be spared the cost of replacing the fairing lowers. Here's the post if you want a giggle click

In looking at the pics of the day, I noticed a pretty big difference between the colors of the inner & outer cylinders. I know in the days of carbed & air-cooled inline 4s, they used to jet the carbs richer on the 2 inner cylinders to assist in cooling, since they got much less air flowing over them than the outer 2.

But isn't this supposed to be a non-issue on liquid cooled engines? The inner 2 are clearly a much lighter color than the outers. This strike anyone as odd or is this a normal thing?

thanks in advance

 

[dcarver]

Sorry, I don't really know!

 

[Leskid]

Sorry, I don't really know!

considering 27 people have seen the post and yours is the only response, I'm thinking it's a non-issue. Only reason I noticed it was cuz I ran her hard in 3rd all day naked, while snapping piles of pics.

thanks - I think that sounds reasonable

 

[charismaticmegafauna]

Sorry, I don't really know!

considering 27 people have seen the post and yours is the only response, I'm thinking it's a non-issue. Only reason I noticed it was cuz I ran her hard in 3rd all day naked, while snapping piles of pics.

thanks - I think that sounds reasonable

I don't.

All 4 cylinders should run the same. Stainless tubing will discolor with heat -- often exhibiting a 'straw' color farther back and reddish-blue-ish closer to to the source of heat. The more heat -- the more discoloring.

The color of the stainless can be similar to an actual thermometer. You appear to have 2 cylinders (#2 & #3) that aren't contributing their share?

An inspection seems like it might be a good idea?....things like: reading spark plugs, compression check, throttle body synch. The common item here is the ignition circuit -- same ignition primary and secondary fires both cyls. 2 & 3 (1 & 4 have their own separate circuit).

 

[ionbeam]

All 4 cylinders should run the same...You appear to have 2 cylinders (#2 & #3) that aren't contributing their share?An inspection seems like it might be a good idea...

Could be air flow, might be related to the balance tube between cyls 2 & 3 head pipes. It would be interesting to see what the pipe temps are right at the cylinder head exhaust port.

 

[rushes]

That's a Canadian model right? It's to help keep yer feet warm... :thumbsup:

 

[Wicked Webby]

Looks to be related to the outer cylinder headers cooling/keeping cooler than cylinders #2/#3 with the plastic off. My guess is you've got nothing wrong with your bike.

 

[Leskid]

Looks to be related to the outer cylinder headers cooling/keeping cooler than cylinders #2/#3 with the plastic off. My guess is you've got nothing wrong with your bike.

That supports charismaticyadayadas post, but you just plugged-in the missing piece of the equation to explain the difference between inside & out.

hey, that's 2 technical concerns I'm no longer worried about in one afternoon. This forum rocks

thanks to all!