morrowcarl72

i have a 95 intruder 217... everything is running the best it ever has since the motor replacement...

like previously stated it is a 1998 502 roller cam motor that is all stock with a dui distributor and a holley 9022 carb and a blue electiric pump...


just curious what people run for jets in similar aplications.

everything is basically stock in my motor and carb
timing is spot on between 34-36 runs starts drives great... just thinking about upping the secondaries a size or 2

Unlimited jd

iTrader: (5)

you run that much timing ? i thought most were running 32 max, jetting has a lot of variables, i cant remember what mine was, are you running power valves ?

morrowcarl72

it is about the 34 mark... and the carb is completely factory

morrowcarl72

some one has to be running a 502 with a holley on it with some size advice!

ballon78

I run, and many of the gys i boat with, run stock hp500 jetting on 454/425hp and 502/415hp motors. Works well, tad on rich side but works, must run a dart single plane intake or a hardin hp500 clone one.

the stock Merc jetting on the HP 500 carb is: 81 on the port primary, 75 on the stb primary, 89 on the port secondary and 93 on the stb secondary. powervalve 6.5, but i run a 4.5.....rear blocked.

morrowcarl72

i have never understood the deal with the off set sizes... any ideas why they do it? my 9022 runs a 6.5 pv and 72 primary and 87 secondaries

ballon78

merc does it because the runner tubes on the intake are different length, different temp depending on location.....alot of the time the rear cylinders run hot, furthest away from circ pump, thermostat.

morrowcarl72

so technically it could be more efficent to run that way....

any opinions on if i should change mine to be set up like this? Or potentially if it would help my cause or run better this way?

maybe a size smaller on all 4 corners?

ballon78

i ran my bone stock 502 roller motor last year with emi exhaust and hp500 intake. ran it with a stock 9022 crarb then when to the hp setup, ran more rpms and didntstumble like it did with a stock 9022.......

morrowcarl72

also.... my intake is neither of the ones you listed but it is an air gap style single plane with a tall neck.... it was actually for my efi set up that came with the replacement motor i bought... it has the holes for the injectors and everything that i momentarily plugged with steel freeze plugs until i get a chance to make the efi work this winter..... dont have any issues with it though