[yfzrider69]

The red line was with the 121 head and a 44mm carb, the blue line is same specs but 020 head with a 42 carb.
Dynoed at OCP in Winchester Bay

MODS:
MMAD 121 head
Lightspeed intake
warpspeed exhaust
+3 hr crank balanced, welded and trued
98mm Athena with 14.1 MMAD piston
Dasa
FCI
44 carb
110 vp

 

[yfz rock]

I wish I made big boy power like everybody else's!!

 

[yfzrider69]

It's just money right lol

 

[boomer669]

Yep it sure is. Cant take it with ya...

 

[turd427]

I'd be pissed if I went from a 020 to a 121 and bigger carb and got nothing. Did you get more porting done or just the bigger valves?

 

[yfzrider69]

What do you mean nothing? The peak isn't anymore but its 3-4hp more over most the curve. I could tell a nice difference between the two. I was happy with it for what I paid. The upgrade was free except for the carb bore and I already had a 42.

 

[trojanray]

i have a very similar build i can't wait to see what i get. I'm running a 12.5 cp piston but i do have the14.1 mmad piston sitting in a box in my garage. I'm looking for lightspeeds but i think i should dyno my 963s before i swap them. my fci is cut/stretched with a mmad +1 ss head.

 

[06yfz]

I'd be pissed if I went from a 020 to a 121 and bigger carb and got nothing. Did you get more porting done or just the bigger valves?

shortly after this dyno his "balanced, trued and welded" hotrods stroker crank decided that it no longer wanted to be inside the motor so i would bet money that it was on its way out and thats why it didn't show more of a gain on the dyno. But thats just my opinion :blah

 

[ldjbuff]

3 HP gain over most of the curve is awesome.

 

[bigwaynester]

N i c e !

 

[buckwild]

3 HP gain over most of the curve is awesome.

True dat!!!

 

[JJVeld]

The upgrade was free except for the carb bore and I already had a 42.

free 121 head? where do i sign up?

 

[turd427]

What do you mean nothing? The peak isn't anymore but its 3-4hp more over most the curve. I could tell a nice difference between the two. I was happy with it for what I paid. The upgrade was free except for the carb bore and I already had a 42.

Can't take a joke anymore, it was either that or something about posting an old build is like saying you dated a hot chick before she was hot. Besides I only chase numbers, I don't ride.

 

[yfzrider69]

Can't take a joke anymore, it was either that or something about posting an old build is like saying you dated a hot chick before she was hot. Besides I only chase numbers, I don't ride.

Sorry, still bitter from that motor blowing up lol.

 

[pbsandman7]

Now rememberrrr.... Geoffrey said its not a "mmad 501"... its a 501 with a mmad head. For the reasoning of its suicidal departure :icon_bolt:

 

[yfz rock]

501 are making a come back just say lol