Cold weather effect on performance??????

[santacama]

I don't know how the BGM will go with the standard engine. I run a highly tuned Malossi 221, Rd 350 reeds, MMW head, KEIHIN PWK 28, etc. and the BGM is the best non reso exhaust I have ever tried. And for the city it is even better then any reso one, because it won't lift the front wheel. In this engine it is clearly better then the SIP ROAD.

[Lamaddict]

I don't know about cold weather but there some improvement theory when the air is damp. I had it explained to me about 15 years ago but I've drank lots of beer since then.

[philhnottm]

Sounds like you are a little rich already but start with a 138 on the new pipe. Nothing bad happens when the jet is too big! Although you will probably end up about the same.
When looking at the plug to see the mixture you only need to look at the insulator (white cone). What I look for when the mixture is near correct for me (running slightly rich), deep in the plug it at the bottom of the white cone it will be chocolate coloured then half way up the cone chocolate will change to white. The shoulder/tip of the white cone will be milky coffee coloured. As said in this thread this time of year is best for jetting, so get yer thermals on!

I do like the reports about the box pipe. I might get one for my standard PX. You got a link for mail order?

Jack I use Tom David who owns & runs Twisted Rods always does best price . Details are on E bay TR speedshop or Facebook etc

Mine landed early next week so will know how it goes

Phil