Jetting for cooler weather

[VooDooBanshee]

Hey guys-

 

With fall in full effect in IL, I have a trip planned up in MI in the next few weeks. I am assumung the weather will be in the 40's. Right now the bike is jetted perfectly for the summer and have several rides on it. Do you think I will need to change any of the jetting on her? Will 60-70 down into the 40's make a big change?

 

T6 pipes

+4 timing

K&N filter in stock air box

K&N lid with outerware

stock engine

 

Thanks a bunch!

[robert.b.west]

Hey guys-

 

With fall in full effect in IL, I have a trip planned up in MI in the next few weeks. I am assumung the weather will be in the 40's. Right now the bike is jetted perfectly for the summer and have several rides on it. Do you think I will need to change any of the jetting on her? Will 60-70 down into the 40's make a big change?

 

T6 pipes

+4 timing

K&N filter in stock air box

K&N lid with outerware

stock engine

 

Thanks a bunch!

 

Hey guys-

 

With fall in full effect in IL, I have a trip planned up in MI in the next few weeks. I am assumung the weather will be in the 40's. Right now the bike is jetted perfectly for the summer and have several rides on it. Do you think I will need to change any of the jetting on her? Will 60-70 down into the 40's make a big change?

 

T6 pipes

+4 timing

K&N filter in stock air box

K&N lid with outerware

stock engine

 

Thanks a bunch!

 

Hey guys-

 

With fall in full effect in IL, I have a trip planned up in MI in the next few weeks. I am assumung the weather will be in the 40's. Right now the bike is jetted perfectly for the summer and have several rides on it. Do you think I will need to change any of the jetting on her? Will 60-70 down into the 40's make a big change?

 

T6 pipes

+4 timing

K&N filter in stock air box

K&N lid with outerware

stock engine

 

Thanks a bunch!

 

I would re jet.

[rdzbangshee]

you dont want to cold sieze it up my engine got tight and almost cold siezed my timing and main jet was off felt like the banshee was loosing its voice.i went from t5s to bb cpis and it runs like a mofo.never touched the carbs since.my 35mm carbs hold me back a little.you dont want to sieze up th bottom end if you no what i mean.

[VooDooBanshee]

I'm running a 280 main right now. It's been up to the 40's here are night and she runs great. Not sure bumping the main up to 290 vs 280 will do much damage...

 

I'm also running Klotz @ 40:1 so I am running richer than 32:1 in theory...

[GrMeyer]

I'm running a 280 main right now. It's been up to the 40's here are night and she runs great. Not sure bumping the main up to 290 vs 280 will do much damage...

 

I'm also running Klotz @ 40:1 so I am running richer than 32:1 in theory...

 

going up in the mains will do no damage. Going lean will do damage in no time. I always jet up before I jet down. Easier to see if the bog gets worse or better.

[06specialedition]

You always should jet up for colder weather IMHO. When it is colder the air is more dense

[robert.b.west]

I think that if you were perfect with a 280 at 70 deg f that you shoud jump to about a 300 for 40 deg f

[AKheathen]

yes, 2 sizes makes 300. when it hits 32 and below, you are going to need another 1-2 sizes right around there, because of the significant humidity change, coupled with the temp drop. there is also a tep range, ususally 30, that you have to watch out for oil separation and major viscosity change. you will need to adjust the air screws around 40, and think about the pilots and needle below freezing...