Hey guys, 

Just new to this forum, Was wanting to know what's involved in swapping black heads from an 883 for polished heads on a Forty-eight. 

Can you just straight swap with new seals in each??

Cheers! 

 

 

883 heads onto a 1200? the 883 heads have a smaller combustion chamber, smaller ports and smaller valves. You'd be robbing yourself of power by doing so.

T1

are you talking heads or just rocker covers?

Hey thanks for all the replies! 

I'm in talking just the rocket covers!! 

the 883 has been bord out to 1200 also!! 

 

Cheers

Yes they will fit.

T1

that is correct george , i have just bored early 883 cyclinders to 1200 , 10.1 comp , screamin eagle cams , standard throttle body etc , bike stock tuned went 54 rwhp on my dyno , then i bought the correct pistons to  suit , i ported the intake and exhaust ports ,, 4 angle job on the seat and 2 on the valve , this bike then went 83 rwhp , the bike eng is also very responsive down low due to the correct port velosity , it made 4 hp more than a full se kit with the same cams and 1200 se heads untouched , the standard head can produce very good power with out expensive work ,

What was the measurement on the squish band Alan?

We are off topic, but head for head in standard trim the 1200's are better, the 883 heads can be worked to flow enough for ~110HP but the effort is better spent on the 1200 heads. The 883 valves start off closer to the pistons and will limit the max lift (it can be helped but why bother) Dollar for Dollar if you were looking for big HP then start with the 1200 heads, otherwise yes the smaller 883 heads can be used. Everybody has their ways of doing things and everybody requires different power levels at different RPM's and this is what you need to decide before even opening an engine, somestimes its not all about that "MAX HP" number....for me Peak Average is where its at for the street.

T1

hi t1 , was set at forty .040, wiseco 10.1 pistons pistons to suit 883 flywheel weights and 883 chambered heads  , cams s/e 25649-1a , eng ended up very torquey low and mid range , suprised me when i rode it how well it pulled , but then bike  still had standard 883 gearing , felt bit short gearing wise , but owner likes it , mechanicaly eng has bit of cam valve train noise , would have liked to have fitted ajustable push rods but was budget build for owner ,

I did a 1250 kit in an 883 recently (.040" on squich band as well) and fitted the 1200 front pully. Made 86hp, but as you say very torquey down low. You could see from the dyno its a little limited up top. A clean up in the ports and a cam would def help it. A good combo for the price that many would be happy with, but not all.

T1

Getting slightly off topic, but loving reading this thread guys. Keep it coming! 

the 883 head tidied up made it cost effective for the customer, would like to have tried it with 1200 pulley as figures would have read higher than with lower gearing , customer happy thou , top gear roll ons , he leaves all the tc behind

Boys I'm overwhelmed with the response's!

Thank you to all who posted, there is a lot to process as I'm not aware of the tech side and performance options.. 

I was also wondering if anyone here does custom made exhauset's for a 2012 HD forty eight??

any help would be great! 

Cheers! 

what sort of pipe you after? Every single idea/design you can think of has been done for a sporty, so a lot will be ready to bolt on proposition.

bassani
Vance and hines
D&D
supertrapp
pipedreams
sikpipes

thats a short list to get you started. A custom set of pipes can be done however.