RoadManiac

I am wondering about this,
a friend of mine also has a Superhawk and ive noticed some differences in the 2 bikes :
mine needs alot more amps to crank it over and when its quite cold the battery is really struggeling even with a full charge.

my bike runs a bit hotter (not to hot) on the same hot days

and with similar set up.... both slip ons and mine isnt even fully dialed in yet it still needs a carb synch and proper dyno run and fine tuning but i am not much faster but through the rev range mine pulls better and harder

my carb set up is stock main jets and 50 pilot and my friend has the same only 48 pilot's

and because it bought my bike through a middleman i don't know the history of my bike, but most of my bike mods where already done by this guy so thats why i am wondering about the pistons,
so i am gonna do a compression test but i am in europe and don't know wat type of displacement the US use with those tester but my question is
what compression is stock and what would it be for HC pistons
then i can convert it somewhere i am sure

jscobey

IIRC stock is 9.4:1 and high comp is usually somewhere around 11.3:1 up to 12.4:1

NHSH

I think your battery is just not strong enough at this point, if you swap batteries with your friend you will see that the problem swapped between the bikes as well, if the battery is getting old, it may show that it is full, but will not give you the output power you need.

geluk mijn vriend ;-)

jscobey

yea i agree, i doubt its high comp pistons. usually thats one of the later mods on these bikes after people have thrown lots of money into things like fork swaps. swinger braces, lightned flywheels, etc. only later do people usually put in high comp pistons. USUALLY. i will say im not educated that much on the sunject of high compression pistons so i cant speak to the technical side of things or what the character of the bike would be like compared to stock pistons. im just saying thats usually one of the last mods

zxbud