I never knew there was a difference. I wonder how many big bore kits have been choked off

 

the small 883 ports are not really the issue,its that the 883 chambers are a lot smaller than 1200 chambers and unless you use dished pistons or open up the 883 chambers,you`ll be running a lot more compression than you want (unless your setting up a very high compression motor,& in that case,you shouldn't run a OEM cast piston)

 

Wiseco offers a reverse dome piston that maintains OEM piston weight, and OEM compression, under the 883 chamber.
Scott

 

Amazing, the things you learn on the Forum

 

Find out if you need ring compressor tool. Installing pistons is the worst part of engine repair for me.

 

yup,thats what we use here

 

Depending on the year of the 1200s it will have dual plug heads and 10:1 compression. So a set of performance cams may work well for you. SE 496 cams would be nice as well as n4. If on the cheap a used set of stock W cams will be a nice upgrade to what you have. The S motor when set up with dual log was an ice motor with great mileage


Edit: I would keep the 883 heads in case you decide to do a performance build. Those heads are nice to work with if you decide to have them reworked. Also that allows you to keep riding your build whale parts are off getting reworked.