Lacking throttle response on my MS260.

[rustyb]

I didn't think much of this until tonight when using my MS180 & MS260 back to back. My 180 has great throttle response and it's bone stock. My 260 was a dissapointing dud when stock,.... all across the powerband. So, I opened the muffler, replaced the fixed jet carb with a fully adj carb and recently modified the choke flap. The muffler mod & carb switch really woke this saw up but, it still has poor throttle response. By that I mean it seems to be slow to pick up the RPM's initially. After they're up, it's great.

Is this just the nature of the MS260 compared to a smaller displacement saw (180 in my case) or does it sound like my carb adjustments are still off?

I have played around a fair bit with the HS & LS screws but have yet to see much improvement. Though I certainally don't consider myself an expert at carb tuning, I have been doing it for some time now (on MotoX bikes, then weedeaters & saws) and I have been following suggestions here and from the Madsen's site.

So, whatcha think guys; carb adjustment or the nature of the saw or,....something else?

Thanks.

 

[sedanman]

What length bars do you run on each saw? If the little on sets to spin a 14" loop of pico and the 026 is hung with a tight loop 3/8 on a 20-24" bar then threse gonna be a difference in accelleration, The low side has to be rich enough to give a shot of fuel to accellerat on until the high side starts feeding thr fire,.

 

[rustyb]

Sedanman,

I'm nearly certain the 180 has a 14" bar & I know my 260 has an 18" bar.

Thanks for the reply.

r

 

[Kneejerk Bombas]

SLow throttle response is normal for the 026.
Running .325 instead of 3/8" chain helps.

 

[bwalker]

It hard to say with out runnign your saw, but it sounds like you carb setting are on the rich side. If the carb is tuned right the 026 responds as good as any saw.