Shindaiwa 488 w/fixed jet carb

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So I just got my 488 running and noticed during the rebuild that the muffler is pretty restrictive, but this one has a fixed jet carb.
Is there a different carb available for this saw or is there an adjustable jet under the funny looking cap on the carb?
 
I didn't know they came with a fixed jet carb, I had the old 490 here which is the samw
saw, both jets adjustable, no restrictors on mine, sold it like a clown, so no idea what carb it had.
@fordf150 any idea what carb came on the 488, was it before the Echo marriage.
 
I see they also came with a non adjustable carb, some info
in your PM, from another site, not sure I can link it.
 
That is my 3rd Shindaiwa on the shelf to rebuild.
Wore out?, or abused?, mine were all new, so no issues with them.
My 490 was an early one, no restrictions I recall in the muffler, the next
one had some EU / EPA sticker on them, so I would assume they were more
bagged up.
My next will be the Echo 620 or 621.
 
I’m not positive but I think the 488s with silver top handle are non adjustable and the ones with a black top handle are fully adjustable.


Sent from my iPhone using Tapatalk
 
What plug do you use in your 488? I'm using NGK BPMR7A, but apparently the 'R' type can give the saw issues.
 

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