Thread: Stihl MS880 Tuning & Muffler Mods

My MS880 muffler mod details are here
https://www.arboristsite.com/communi...uestion.88748/
You have to register to see the pics.

Outcomes
- slightly more power
- uses a lot more fuel
- runs a few degrees cooler.

You have to retune (using a tacho is safest) and if you really open it up you may even have to use a bigger H jet or you may run the saw too lean and cook the engine.

Originally Posted by '82shovel

Hi people,

I was chasing the tuning specs and procedures for the 880? A few threads on the Stateside forums are a good read but I suspect that the colder climate there would mean different tuning procedures?

Depends on what you mean by tune, if tuning the carby the principles are the same and you need to learn to read the plug for a two stroke which is entirely different to a four stroke. If tuning to get a a heap more power then that is a different ball game and costs money. You can move the power band different ways using port heights and pipe lengths and also different secondary compression ratios of course but unless you are prepared to spend money when it seizes then don't do any of that. I wish I had all the money I have spent blowing up and fixing two strokes to see what works and what doesn't, literally tens of thousands of dollars have gone down the carby and out the exhaust pipe.

Originally Posted by '82shovel

Hi people,

I was chasing the tuning specs and procedures for the 880? A few threads on the Stateside forums are a good read but I suspect that the colder climate there would mean different tuning procedures?

The procedure is independent of temperature.
From the workshop Manual - for milling I set the H screw a tad rich using a Tacho so rather than 12,000 rpm, the max RPM is 11,500 rpm
Screen Shot 2018-01-17 at 4.23.18 pm.jpg

BobL,

Cheers mate, your input is appreciated.

Matt