munro1656

hi all
just a quick qeustion is there a big difference in power between the walbro 257 as opposed to the 644 on a zenoah 260pum
with tined pipe ? what are the power differences?
thanks

ken0276

My Feedback: (2)

I have both of them but have not compare yet, as Zen7's guy told me, they are the same for the speed only thing different is the H and L's setting.

TERBObob

My Feedback: (21)

Can not say for a fact , but it seems to me that the 257's throttle faster. ( have no way to test )

stuarth

Has anyone got needle settings for a stock Zen with 257 carb and tuned pipe at sea level?

Much appreciated!
Stuart

martno1fan

dont have the 257 i run the 644 my needle settings are 1 3/4 low and 1 1/4 high maybe try that for a starting point.

Believe It

start out at 2 to 2-1/4 on the low and 1 on high. You will probably just need to lean the high needle a tad. Keep a good tan color on the plug!

BB Modss

2 1/4 low, 7/8 high for 257 @ 2550' alt