Dolmar 166 pistons - help / discuss

[Gumnuts]

CAN SOMEONE MEASURE THEIR PISTON TO COMPARE

G'day - Looking to get some 166 pistons made.
Measured the one i have .Hoping one or more of you
guys has one there to measure and compare.
measures 50.65 mm -overall length (at longest)
diameter 55.65 mm -
13.5 mm OD piston pin
24.66 mm crown to piston pin center.

Arias pistons made in U.S.....anyone wish to follow up on www.ariaspistons.com - (C.A )in the states for a price.

ANYONE INTERESTED .... ?

 

[tdi-rick]

Wiseco used to make small two stroke pistons, but I think they've cut the small lines.

Also contact Asso Werke in Italy, they specialise in two stroke pistons and may have patterns on the shelf, or even contact Mahle, they probably made the originals.
I was on the Mahle aftermarket site this morning and interestingly they don't list any Dolmar or Stihl pistons but may have patterns of something that old and it may not contravene any agreement they may have with Dolmar about supplying the aftermarket.

<edit> Other small batch high performance piston manufacturers are Omega Pistons in the UK and Capricorn Automotive (Wiseco/Perfect Bore) in the UK.

 

[Gumnuts]

Thanks tdi - rick,
So far have written to Dolmar / Hamberg....waiting reply....... helpful in the past.
Rung around motor-bike shops which led to Quantum
racing Industries , JP Industries , Ian Williams Kart engines .
Was advised Rocket Industries supplied Mahle in Australia BUT
their supplier was Arias pistons in the U.S .
Don't know if the Dolmar even used Mahle .The only marks on the jug are 023 - 1A .
Saw sold 1984 - 1992 in Australia.Chrome bore...would be nice to go one better....Nikisil / Gilnisil.
Parts for this model, rare as rocking horse poo.
Will look into your leads.....many thanks.

 

[tdi-rick]

All the Italian kart engines I used to run years ago used Asso, and I'm sure they do saw pistons for saws as I had them bookmarked but when I went looking this morning their website was being upgraded or somesuch.

Starting with Dolmar is a good idea, and if they don't have anything they might be able to send you towards someone that can.

 

[leeha]

Are you sure your measurements are correct.
My pistons are 56mm diameter with a 14mm
wrist pin.
I have looked into Wiseco and they can make
them but it's a bit pricey. A year ago it was a
minimum order of 25 at 129.95 each. Prices may
have changed since then.
I am currently working on a Husky 394 piston to
fit. I had to bore the pin hole from 13mm to 14mm
now i have to recut the clip groves. Using this piston
will require an .080 thick base gasket. "Approx."
as the distance from top of pin hole to top of piston
is greater than the 166 piston.
I would be very interested in some nice quality
replacement pistons if you can get some made for a
reasonable price.

Lee

 

[Gumnuts]

Are you sure your measurements are correct.
My pistons are 56mm diameter with a 14mm
wrist pin.
I have looked into Wiseco and they can make
them but it's a bit pricey. A year ago it was a
minimum order of 25 at 129.95 each. Prices may
have changed since then.
I am currently working on a Husky 394 piston to
fit. I had to bore the pin hole from 13mm to 14mm
now i have to recut the clip groves. Using this piston
will require an .080 thick base gasket. "Approx."
as the distance from top of pin hole to top of piston
is greater than the 166 piston.
I would be very interested in some nice quality
replacement pistons if you can get some made for a
reasonable price.

Lee

Sounds interesting Lee....there must be many of us looking into prospects.
Will check my measurements in morning light....
may have to grind micrometer sides to a point...circ !!!!
www.ariaspistons.com supply Rocket in Australia with Mahle.Was quoted U.S $640 for a minimum run of 4 ...guess i'd be in for 2 of them.Just thought would be cheaper buying direct in U.S......maybe if you care to call them.C.A (U.S.A) phone.........310-532-9737 ...based in CA - 90249...

Also read A1 stamp is for best fit
D stamp is for industrial fit
Dolmar cylinders were made by Mahle EDIT : (hmm....no nothing about these ones but am now a member of the flying giants-hope they can shed some light ! .) Aveen , A& M ,Yeager engineering, TG , and Walker Machining.

 

[Gumnuts]

Many thanks to the Flying giants.......
MORE INFO....
Does your cylinder have a K superinposed on an S stamp ?
Mine does.....it is the stamp for Kolbenschmidt.
http://www.kspg-ag.de/index.php?lang=3
....may take several days to get reply from Dolmar /
Hamburg and now this company who produced piston/cyl
assemblies for the 166.
Have asked Dolmar for pdf / workshop..and tech specs for
piston / cyl....will pass info on....if and when its forth-coming.

Lee
my old cyl is not a perfect round...port to port
55.65 mm....at right angles shows 55.81
my squish came in at .081" / 2.06 mm ,while using the
base gasket of .019" / .049 mm ...much room for improve-
ment.....even just for a work saw.
................still thinking how to measure length between
crank bearing centers....

tdi-rick have written to Asso for a
price on a minimum run......thanks again for the lead.
- Graeme.

 

[husq2100]

the k symbol superimposed over the s is also present on some of the husky's i have:

early 288xp

and 2100's

Serg

 

[Gumnuts]

I am currently working on a Husky 394 piston to
fit. I had to bore the pin hole from 13mm to 14mm
now i have to recut the clip groves. Using this piston
will require an .080 thick base gasket. "Approx."
as the distance from top of pin hole to top of piston
is greater than the 166 piston.
I would be very interested in some nice quality
replacement pistons if you can get some made for a
reasonable price.

Lee

No news as yet except did get a call from the KS rep in Australia, following up one ,of many,hopeful connections with them.....hows the conversion going ? Will be real intering to hear how it goes.
Did you consider other piston options.... Mac 125 / husky 2100.....just wandering how theyd retro....also See Balska ( i think ) referred to the 090 top end being used.
Having thoughts of 'The Last Indian'....mates got a forge next door,melt down a few deaduns...then send off to the machine shop??
- Graeme

 

[leeha]

I haven't had much time lately.
Will see if i can at least measure my cylinders
and see if they are like yours.
as for other pistons the 2100 Husky was to tall
from wristpin bore to top of piston. The 394 was
closer but still have to use a shim under the cylinder.
If your squish is correct then you can use a thinner
shim like .0625 which is 1/16 and much easier to
find.
If there were enough of us needing and willing to
pay for some pistons it might be worth getting some
made from Wiseco or someone else.

Lee

 

[Jacob J.]

Lee- good to hear you're making progress with the 394 piston. I just had a full-circle 2101 piston turned down to fit a 395 and was wondering if you were planning on turning down the 394 piston for your 166 application. There's a lot of meat on top that could come off.

 

[leeha]

JJ, the 394 piston i'm messing with is an
aftermarket piston and it has less meat on
top than the original 166 piston so i'm not
going to turn it down. If i remember right the
166 was around .220 thick and the 394 was .180
If the 394 works out i might buy an original
394 and see how thick they are.
What do you think the minimum thickness should be.
So far i have check all kinds of saw piston and many
dirt bike pistons with 56mm bores and my 2 problems
are the wrist pin diameter, I need 14mm and then the
distance from wristpin bore to the top of piston. Stock
166 is .700 all pistons i have checked are much taller
.150 or so. the 394 was only .100 taller and then a bit
less once i bore the pin hole from 13mm to 14mm that gave me another .020 less.
All i have to do now is recut the circlip groves and make a
shim for under the cylinder once i have figured the squish
i want.

If anyone has a used oem 394 piston they want to part with, send me a PM.

Lee

 

[Gumnuts]

Lee
my old cyl is not a perfect round...port to port
55.65 mm....at right angles shows 55.81
my squish came in at .081" / 2.06 mm ,while using the
base gasket of .019" / .049 mm ...much room for improve-
ment.....even just for a work saw.
................still thinking how to measure length between
crank bearing centers....
]

I
Will see if i can at least measure my cylinders
and see if they are like yours. The 394 was
closer but still have to use a shim under the cylinder.
If your squish is correct then you can use a thinner
shim like .0625 which is 1/16 and much easier to
find.
If there were enough of us needing and willing to
pay for some pistons it might be worth getting some
made from Wiseco or someone else.

Lee

my haste and mistake..... should read piston not a perfect round.........
I did check the squish several times tho.....so that measure am good with
but will check yet again when it counts.
-Graeme

 

[Busmech]

166 piston

If some one can get them made I would be in for a couple at a decent price,
but what I really need is a coil for a 166 or an idea for a replacement coil.

 

[Erick]

I'd be in for a piston or two myself if someone gets an order up...... also if anybody has a muffler laying about they could part with I could really use one, shoot me a PM if you can help.

 

[CHEVYTOWN13]

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The way this bad boy moved that splitter, it's time I start saving some pesos for a build.

 

[Gumnuts]

Still trying to source info.

Are you sure your measurements are correct.
My pistons are 56mm diameter with a 14mm
wrist pin.
I have looked into Wiseco and they can make
them but it's a bit pricey. A year ago it was a
minimum order of 25 at 129.95 each. Prices may
have changed since then.
I am currently working on a Husky 394 piston to
fit. I had to bore the pin hole from 13mm to 14mm
now i have to recut the clip groves. Using this piston
will require an .080 thick base gasket. "Approx."
as the distance from top of pin hole to top of piston
is greater than the 166 piston.
I would be very interested in some nice quality
replacement pistons if you can get some made for a
reasonable price.

Lee

Lee.....Was checking out bike pistons.
Suzuki RM TS 125 1971-78 14mm gudgeon / 56mm
Honda CR125 1973-78 " "
Kawasaki KX125 up to 91 " "
and of course the big bore 066 with Baileys .Not having much luck getting the distance for the top of the pin to the crown tho.......tried bike forums/wreckers .....still no luck.
Arias pistons will do a minimum of 5 ,to a run.....would be
good if one of the bike pistons was do-able.
Did you look at the big bore 066.

- Graeme

 

[tomdcoker]

Well since we are on the 166. I need an air filter for mine. I would like to have one of the round type. It is not shown in my IPL. I think it is an after market. I would be interested in a 28 to 32 inch Dolmar bar if my wallet will stand it. Thanks Tom P. S. I have some phone numbers for old Dolmar dealers that I will call tomorrow. I will see if I can find any NOS parts.

 

[Gumnuts]

Apols for delay - still researching !

If some one can get them made I would be in for a couple at a decent price,
but what I really need is a coil for a 166 or an idea for a replacement coil.

Have been looking into the coils for you too....no bliss yet,
will ring a guy later this morning.

I'd be in for a piston or two myself if someone gets an order up...... also if anybody has a muffler laying about they could part with I could really use one, shoot me a PM if you can help.

Looks like Arias pistons p/l will do the smallest run......will
ask this guy about muffler too.
Just trying to get a handle/info on these other options.

- Graeme

 

[Gumnuts]

Well since we are on the 166. I need an air filter for mine. I would like to have one of the round type. It is not shown in my IPL. I think it is an after market. I would be interested in a 28 to 32 inch Dolmar bar if my wallet will stand it. Thanks Tom P. S. I have some phone numbers for old Dolmar dealers that I will call tomorrow. I will see if I can find any NOS parts.

Hey Tom,
Can't say knows much on the filter you require as mine are the square type....but believe yours are a K&N
http://knfilters.com.au/
.....not sure of size and part number you need .....hopefully one of the guys here will know.
- Graeme