RZ250 main jet size
Posted: Tue Sep 26, 2017 4:24 pm
In my efforts to pin this RZ250 down perfect... (it's running pretty nicely, but I'm still chasing a slight lack of power under load at WOT - feels 'heavy' - sound rich to you?). Thinking maybe I need to change the main jet. It pulls cleanly through the gears. Smokes a bit when cold but no smoke when warmed up.
I know I'll need to re-check float height and needle position, but because everything is factory standard, the standard MJ size should be right. (But what is standard?)
The bike has standard air filter, exhaust, new pistons and bores fitted about 400ks ago, so I guess it's almost run-in.
Everything else is good, temp etc. First-kick starter.
I'm sure I'll need to do a plug chop to fine tune it, but what is the STANDARD MJ size for a '64 RZ250? -I see varying figures quoted... from 155 to 250.
Whaddayareckon?
I know I'll need to re-check float height and needle position, but because everything is factory standard, the standard MJ size should be right. (But what is standard?)
The bike has standard air filter, exhaust, new pistons and bores fitted about 400ks ago, so I guess it's almost run-in.
Everything else is good, temp etc. First-kick starter.
I'm sure I'll need to do a plug chop to fine tune it, but what is the STANDARD MJ size for a '64 RZ250? -I see varying figures quoted... from 155 to 250.
Whaddayareckon?