Another chainsaw dyno...

[Dieselshawn]

My MS260 with the large carb will run on 92 octane gas but the saw will almost always act like a dog that sneezes on their food and pees on it if they don’t like it.

That gas ends up being fed to my 1968 JD 140 lawn tractor which will run even on stale gas.

So I’ve continued to run 87 gas since for all my saws.

 

[Red97]

Joe any plans for the 501? It would be nice to see what a muffler mod does and maybe a gasket delete. Personally I think it did pretty good considering it went up against one of the strongest 50cc saws out there.

It will get ported eventually

 

[MustangMike]

I run High Test (93 Octane) in my saws, and always mix it as soon as I get it. 2 cycle oil stabilizes the fuel.

The Stihl manual says that High Test fuel runs cooler, so I run it.

 

[Wilhelm]

Banshee 443cc for nowView attachment 252904

@Red97 , we wanna see this thing on the dyno.
It's chain driven, sooo . . . .

 

[Deets066]

Let’s go!

 

[CR888]

I think the older gas gets... say maybe a couple weeks to a month old... the saws seem to make less power, start worse and run worse. I haven’t done any tests... but it seems so. Would be interesting to dyno test that theory. Fuel age/quality... it seems to matter. I’ll take fresh 87 over weeks old 93 octane... especially if it’s pump gas. The canned fuels seem to be more stable and deteriorate at a slower rate. Just a few observations I have made.

This is how I look at it....think of gasoline fuel like soda water. When it's fresh you can shake the bottle and it'll create pressure but when it gets stale and left open it goes flat. Well gas is exactly the same in a way, fresh gas has a high RVP (Reed Vapour Pressure) which can be measured. The higher the RVP, the more volatile it is. As it ages it looses it's RVP, like soda looses it's fizz and becomes less volatile. The more stale gas is the less power it can produce. I get fresh 87 pump gas twice a week for my saws, don't use stabiliser, don't run hi octane and find that best. Fresh gas is way better than hi octane stale gas. But racers often test the RVP of their gas, I don't but trust if it's bought fresh from a high volume supplier you should be ok. And remember, gas starts losing its volatility the second it loaded onto the truck from the refinery. Some racing nuts will source their gas from the first delivery point from the refinery rather than the last, but that's a bit over the top IMO for cutting up trees lol.

 

[RI Chevy]

Why no fuel stabilizer???

 

[MustangMike]

Because he buys is twice a week Jeff, instead of like me about every other month!

That is why I like to mix it as soon as I get it. The 2 cycle oil has stabilizers.

 

[CR888]

Why use stabiliser if using fresh fuel. Look how stabiliser works...it's similar or likely alcohol that absorbs water. Horrible stuff if you don't absolutely NEED it. If you can source fresh gas, that's what your best off using.

 

[RI Chevy]

I'd still use it though. Cheap insurance.
I hear you...

 

[JohnnyBlade]

Wanna race?

Ok wer gonna need some pics of the
opponent

 

[Deets066]

Ok wer gonna need some pics of the
Loser

Fixed

 

[jacob j.]

Fixed

View attachment 252990 View attachment 252991

That's some badass *s-word, right there...

 

[JohnnyBlade]

Fixed

View attachment 252990 View attachment 252991

Whoot whoot! Got love a Banshee!!! That is sweet looking too! R these quads gonna make it to Kevs in Sept?

 

[Deets066]

That's some badass *s-word, right there...

I know how fast mine is, couldn’t imagine a methed out 443

 

[jacob j.]

I know how fast mine is, couldn’t imagine a methed out 443

I was lucky enough to see the Bigmac drag bike in person. It's freaking awesome.

 

[Deets066]

I was lucky enough to see the Bigmac drag bike in person. It's freaking awesome.

See?
I wanna ride that fugger

 

[TreeLife]

To me, nothing compares to the banshee.

 

[Deets066]

Clutch is slipping on mine, need to get me a lock up

 

[cuinrearview]

Been a minute since my banshee. It was a hoot on the road, and up at the dunes at Silver Lake. Never cared for it in the woods or on the MX *s-word.