Cold weather Jetting

[trx250rforlife]

hey i live up in canada around toronto an its about +6 to +7 out what kind of jets should i run i have a 182 on it just changed from 180 an i have a ESR 310 kit new cyclender Vforce 3 reeds 39mm pwk esr trx5r pipe thanks with k&n filter lid off

[86 Quad R]

plug chop it the same as you would when weather is warm. :cool:

[Saul76]

Keep going bigger on your main until it 'blubbers' at WOT - then back it down smaller sizes till it 'cleans up' - then to be safe do a plug chop.

[matt14c]

I just tried searching and couldnt really find anything but what is plug chopping and what exactly does it do?

[86 Quad R]

plug chopping is the process of running the engine at a specific rpm (under load) and killing the engine while pulling the clutch. afterwards, getting a plug reading. ideally you want to get a plug reading as close as possible to a light tan(honey) to medium choc(koffie) in color.

to better understand carb tuning read READ (http://www.duncanracing.com/TechCenter/KeihinCarbJetting.pdf) this for reference. :cool: