250R 30mm stock carb to 34mm carb.....jetting jump up or down

[1972mercury]

I have a 84 250r everything stock have a 85 250r 34mm round slide carb coming. stock jetting in the 30mm carb is 50/130 stock jetting in the 34mm carb is 52/142 going to be putting on a DG pipe the same time I put the carb on I think the pilot can be left alone but the main not sure on? I know there are other guys that have done this upgrade but never really said what they jetted there's at. If anybody else has upgraded there carb on there airfooler let me know what you guys put on!

[manbearpig]

I have done this swap on 2 of my 82 250R's. seems like i remember starting off at a 150 main to be safe and working back to a 145. its going to depend on altitude and level of modifications. my machines are aftermarket and modified from air filter all the way to the exhaust tip and i only had go slightly bigger over stock. It will all depend on your setup though. Remember, a few $5 jets, a handful of new plugs, and 30min of your time will ALWAYS be cheaper than a new top end.

[toki]

I'll have mine home with the same swap in a few days. gotta pull it all apart anyhow. i'll let you know what im at. and where are you from in WI? I live in turtle lake.