Originally Posted by
Gizmatron
Well boys..10 tanks through the MG66 so far and this thing is an animal..pulls the lighter clutch spring and higher gearing without a hitch..smoooooth down below and screams at the top..best of all worlds and I haven't even begun to lean it yet..I am just in LOVE with this motor..tomorrow is forecast sunny and 28ºC and i'm being paid and fed to run in the motor all day and generally be a hooligan...F.A.B mr tracy!!!!
Wicked mate - You live for days like that eh
Glad to hear the motor is what we expected. It sounds like a real beauty.
Originally Posted by
casevac
I'm about to finish break-in of my Caster MK2, and just started tuning it.
Whats the general rule with this mill, lean on bottom and rich on top?
I really havent done much with HSN, did not take much at all, it screams with a nice trail of smoke. Bottom end on the other hand hesitates.
The Caster MK2 are supposed to be basically the same as the GO 5-port.
The bottom sounds nagging, like it should be on the lean side, but my attemt to rich it just made it worse. Temp doesent indicate lean setting either.
It idles great, and responds fine, but seems to lack some power.
I'm running it with Dynamite 086, would JP2/4 be a better alternative or should I rather go for a torque pipe, like the Nova 9901?
It is pretty much a GO 5 Port in different clothing.
Generally the GO's like a fairly rich top and a little leaner bottom, but that will depend on what low speed needle you have. I would suspect you have a standard low speed needle, so you could run the top end a little leaner then the GO's perhaps. If it's only new and you don't have that many tanks through it, it will still be tight. This pinch will sap a bit of performance. Don't lean it too much trying to get it to perform until the pinch eases, or you will possibly do some damage. On the GO 5 Ports (gen 4 and 5) the metal pinch is with the motor until 1.5 - 2 gal. Your motor may be a little different, but I think you will find it will still be tight and this is what is causing it to seem sluggish. Be patient with it. It will loosen up all of a sudden and then run great.
What clutch springs are you running. It's not loading up too early and getting a little boggy ??
The Dynamite 086 should be sweet. The 5 Ports run great on the 086. The other pipes I would recommend in order of preference would be the new GO 2072, or the GO 0801 (both have longer headers than the 086). The JP pipes don't work too well on the GO's, so they would be the same on the Castor I would think. They are a bit flat, and economy is not great.