Mastermind Meets The J'Red 2188
- Thread starter Mastermind
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My feeling is that over the long haul the Tillotson is the better carb. The newer, larger Walbros are very sensitive to ethanol containing fuels and the diaphragms get eaten up fast.
But when they're new, the Walbros make a good running saw.
Finally got to run the 2188 Terry did for me in some big wood. Actually had the 36" buried in a split Oak that got blown over during the tornado a month ago. The root ball is going to be a mess to deal with. Had to sharpen the chain three times. The hollow part of the split tree is very dirty and really eats a chain quickly. Learning to allow the saw to cut at its pace with the 36, it screams with a 24". Oiler seems to be less than 385xp, but might be my memory, not sure. By myself so pic with me in it is too much trouble in 90 degree heat. 
The showing cut is about 32".
The showing cut is about 32".
Mastermind
Work Saw Specialist
To be honest.......it's just from experience with these models, and trying different things that I've built the spec sheets I use for each model.
bryanr2
Addicted to ArboristSite
Thread should have been labeled "Mastermind meets the Sexiest Saw on the Planet"..... You gotta own a Jonsered to understand it.
Homelite410
Hack with a CNC Mill
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Yup, you said it right there! Maybe someday one of my Jonsered saws will make it down there! 2145 maybe.....Thread should have been labeled "Mastermind meets the Sexiest Saw on the Planet"..... You gotta own a Jonsered to understand it.
SawTroll
Information Collector
The Tilly carbs speced for them aren't any larger as far as I know (both have about a 17.5 mm venturi) - but that is of course not the only way a carb can be better.
However, I suspect a larger carb is somewhat underrated on these pages - I know it makes a big difference on the 385, and even on smaller saws, so why not on the 390?
Of course it is some extra work to fit a larger carb, as none of them fits as is (that I know) - and of course more cost - so the total price of the work would go up quite a bit.
jeff taswelder
ArboristSite Operative
Nice work 
u da man
u da man
It just seems some of the saws I've run side by side the tilly version had better throttle response even when tuned the same and all. Not sure why. I do have one for an 084. Wonder if that would fit under the hood of the 385?
SawTroll
Information Collector
Well, I know you can put a 395xp top end on a 056mag (it takes a lot of work, and spacers, etc - but is doable) - but I never before heard about anyone being interested in putting a Stihl top end on a Husky saw (usually counter-productive).
If that project is possible, I want to hear more about it though, as the cc difference is so large......
I was talking carb only. A husky bottom end wouldn't last 3 cuts under that pressure.
SawTroll
Information Collector
SawTroll
Information Collector
Excuse me for my maybe simplified theory - but I believe the carb/intake, the transfer capasity, and the exaust need to match, to form the baseline for further improvements, like the flow pattern in the cylinder.
Bettering a single factor doesn't always help a lot, unless it was a weak point to start with.
Bettering a single factor doesn't always help a lot, unless it was a weak point to start with.
Sawtroll, why do you always insist that the carb is such a bottle neck on these? Sure, they can benefit from a larger carb, but no different than most any other saw. They run fantastic with a stock carb.
SawTroll
Information Collector
Just the obvious reasons, like they are larger than the 67cc saws from the 1980s, that needed a 17.5 mm venturi - a bit of common sense - and someone that actually put a larger one (19 mm +) on an unported 2186 to check. It reportedly made a huge differense. That saw did of course have a more open muffler as well, but Zero port work.
Mastermind
Work Saw Specialist
The XT carb is larger, and works very well on these.......but it's not a huge improvement.
A ported 390 makes a lot more power than a MMd one, and will do so with a stock carb. I'm just trying stop the creation of a false notion that a bigger carb is required to build a very strong 390XP. This is not based on a sample size of one, done by someone else either.
Mastermind
Work Saw Specialist
I agree completely Brad. I see no reason at all to swap carbs on these.
If I was building a race saw.......well..... I don't build toys.....so forget that.
If I was building a race saw.......well..... I don't build toys.....so forget that.
SierraWoodsman
ArboristSite Guru
Looks like you changed up the way your doing the MM's on these a little.
Any reasons for not adding the port out the front on this muffler?
Just Curious
Any reasons for not adding the port out the front on this muffler?
Just Curious
