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Author Topic: Stihl 066 carb MS660 Carb question  (Read 2904 times)

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Offline weimedog

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Stihl 066 carb MS660 Carb question
« on: September 27, 2015, 07:11:19 am »
Not a Stihl guy but really enjoying the 660 class saws and want to learn about them. I see all kinds of options and variations.
I see a pile of Walbro options
Tillotson Carburetor HS-320A vs. Walbro Carbs...?

What is the best carburetor to use on a MS660? Money no object?

Maybe the question should b best intake option for a tweaked MS660 work saw.

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Offline Cut4fun .

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Re: MS660 Carb question
« Reply #1 on: September 27, 2015, 07:58:48 am »
I hope I am remembering right the WJ69 was one I liked. There is a bigger of those too.

Have it listed in a thread here.
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Offline Cut4fun .

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Re: MS660 Carb question
« Reply #2 on: September 27, 2015, 08:05:31 am »
Quote from: Cut4fun on May 01, 2011, 07:52:03 pm
Spec info from Walbro on WJ carbs.

The carburetors of the WJ series have been designed for professional applications, especially for chain saws from 50 to 100 cc displacement.

Technical Data:
• Casting available in the following dimensions in mm:
        Choke Bore        Venturi Ø                    Throttle Bore
        22.19                  14.29/15.08                19.01
        22.19                  15.88                          20.56
        22.19                  16.67/17.46/18.26      21.43
        23.38                  19.05                          21.43
• Mounting holes, distance between centers: 31 mm.
• Metering system and fuel pump integrated in the carburetor casting.
• Can be delivered with or without choke.
• Adjustable high speed needles, idle needles and available idle adjust screw.
• Available extras: speed governor, fast idle system.
• Proper function in any attitude.
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Offline Cut4fun .

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Re: MS660 Carb question
« Reply #3 on: September 27, 2015, 10:06:06 am »
I only had 1 066 that had that BIG carb on it at bottom of list. Seem hard to find. 

Choke Bore        Venturi Ø                    Throttle Bore
23.38                  19.05                          21.43

Pic of saw is in that 066 thread I bumped up.
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Offline jmester

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Re: MS660 Carb question
« Reply #4 on: September 27, 2015, 10:27:34 am »
I have run the Tilly hs-320 the wj-67 and the wj-69. They are all good carbs. I have only run them on mostly stock applications. No port work. I like the 320 and the 67 for they have no limiter cabs. I know that you can eliminate the limiters but they seem to lose tune faster. I know the Tilly carb is a good bit cheaper than the walbros. I have one of each if you would like any pics or anything.
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Offline Cut4fun .

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Re: MS660 Carb question
« Reply #5 on: September 27, 2015, 10:40:25 am »
Quote from: jmester on September 27, 2015, 10:27:34 am
I have run the Tilly hs-320 the wj-67 and the wj-69. They are all good carbs. I have only run them on mostly stock applications. No port work. I like the 320 and the 67 for they have no limiter cabs. I know that you can eliminate the limiters but they seem to lose tune faster. I know the Tilly carb is a good bit cheaper than the walbros. I have one of each if you would like any pics or anything.

Maybe some Tilley carb specs and wj67?   Wasnt there a Bing carb off a 064 that would work too?
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Offline mdavlee .

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Re: MS660 Carb question
« Reply #6 on: September 27, 2015, 12:08:36 pm »
The WJ 69 jets are easily removed. Makes drilling the H jet real easy.
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Offline jmester

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Re: MS660 Carb question
« Reply #7 on: September 27, 2015, 03:10:56 pm »
The specs for the tillotson hs-320 Venturi 18.26mm and the throttle is 21.41mm and the choke bore is 22.76mm. i had to measure the choke bore as there was nothing listed.
The walbro wj-67/69 and wj 76 all have a venturi of 19.05mm and throttle bore of 21.43mm and a choke bore of 22.19 mm. based on the above chart seem like it should be 23.38 mm.
I need to go buy a nice digital mm/inches digital caliper and re measure to  make sure those number are exact.
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Offline Cut4fun .

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Re: MS660 Carb question
« Reply #8 on: September 27, 2015, 03:27:35 pm »
You can tell the difference in the big wj and the other wj. I took a choke from reg one and set in big one and it wasnt close.
Least that is how a remember it. Maybe I'm just out there.  :-\ :P ::)

I have only seen 1 of those big wj so far. Plus ven is bigger.
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Offline jmester

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Re: MS660 Carb question
« Reply #9 on: September 27, 2015, 04:46:57 pm »
i am sure that you are right. you have been in a whole lot more saws than I.
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