Cold weather jetting

[Hardcore]

I just spent several days cleaning and rebuilding two '96 Blasters. One is bone stock and needed no adjustments - engine operates flawlessly, starts well cold/warm and throttle is clean through the rpm ranges. The other I had to bore over to 0.5mm over stock. After the bore and top end rebuild I found that this bike wanted one pilot size smaller than stock. OK. Everything was responding well on both again so after a complete break in on the one, a friend and I went out for a rip with the kids. After I put them away for the day I figured I'd check the plugs to see what they were saying. The stock Blaster was grey to dark brown ( a little lean I'd say), and the one with the over bore was grey.

 

"Oh!" I said.

 

It was a lot colder outside than I thought it would be (32degrees F) and hope that this was the reason behind the plug colouration, because there were no indications that they were set up lean - float level is perfect, air screws out 1.5 turns out, needles in mid clip and one above mid for the over bore, and the mains are 240 and 250(stock is 230).

 

I don't want to set these up by going on the plug colour alone. What should my next step be here? Tomorrow is supposed to be in the 50s. so I'll try them in that temp and see how they are.

 

Thoughts?

[Hardcore]

Well it only hit the low 40s today and I took my KDX 200 out from storage to see how it looked on the plugs. In the summer/fall it's tuned perfect- chocolate brown all over. After warming things up and going through the gears using the full throttle range, the plug showed grey on the porcelain just as the Blasters do. I feel confident now that the quads are where they need to be for three season riding. The plugs are reading lean simply due to the fact it's damn cold out. I have been tuning them in a semi-warm garage and expect them to react the same with a cold ambient temp and wind chill once outside. Not gonna happen.

 

All I need is a warm day to be sure this is whats happening.

 

 

Just thought I'd share that even though no one wants to input on this.

 

 

Hardcore.