Compression Question

[strand71]

Has anyone ran the Speedwerx head or anyhead for that matter with 15:1 domes? Currently running 13:1 just curious if there is much to gain or reliablilty? on a 900 King Cat

Thanks for the help

 

[mattymac]

I know of two people that were running 15:1 speedwerx domes one 900 with slp twins and a 1000 big bore with speedwerx twins, it seems like they were around the 190 lb mark cranking compression at sea level but this was a while ago so my numbers could be off a bit.

IMO anything more than stock is a huge improvement! Reliability didnt seem to change but get a good hold on the pull handle when they are cold!

 

[strand71]

Thanks

Did they run them at all at sea level like that? And if so on 110?

 

[mattymac]

No mainly 5000 and up but heres the kicker pump premium and they never misses a beat! I did a rebuild on the 900 just for preventive maintenance and the internals looked great with just under 2000 miles on it