McCulloch Super Pro 125c build thread

[jacob j.]

Ya, I don’t see a problem with it, I just am thinking it could get there! It might land somewhere in the middle too. Will be cool to see what happens!
I also would like to see your Frankenstein saw!

I guess if the compression gets too high, I could run R/C helicopter fuel through an HL-355E...

 

[Bigmac]

I guess if the compression gets too high, I could run R/C helicopter fuel through an HL-355E...

I would assemble it and see were it lands, worse case you make a more radius dome like the 028 super

 

[Lee H]

I'm hoping to hit 195-200 with this one Lee. I may put a totally different intake system on it. I'll start it out in stock configuration and see how it does. I may roll it
up later with a Reed 458 sloper manifold and an 084 carburetor.

Nice, I like it.

 

[jacob j.]

Some Tillotson carb info I found on the interwebs:

Part # Venturi/Throttle/ Fuel Type

HL-166B 0.625 0.81 GAS

HL-166C 0.625 0.81 GAS

HL-357A 0.625 0.81 GAS

HL-357B 0.625 0.81 ALKY

HL-334A 0.75 1 " GAS

HL-365A 0.75 1 " GAS

HL-306BR 0.75 1 " GAS

HL-383A 0.75 1 " GAS

HL-324A 0.75 1 " GAS

HL-304E 0.75 1 " GAS

HL-314G 0.75 1 " GAS

HL-314F 0.75 1 " ALKY

HL-374A 0.75 1 " ALKY

HL-348E 0.75 1 " ALKY

HL-355E 0.945 1.06 " ALKY

HL-360A 0.945 1.06 " GAS

HL-360B 0.945 1.06 " GAS

HL-360C 0.945 1.06 " ALKY

HL-363 0.945 1.06 " ALKY

HL-380A 1" 1.125" ALKY

HL-380B 1" 1.125" GAS

HT-5A 0.9" 1.06" GAS

HT-8A 0.9" 1.06" GAS

HS-175D 0.69" 0.81" GAS

HS-230D 0.69" 0.81" GAS

HS-205A 0.69" 0.81" GAS

HU-63C 0.468" 0.625" GAS

HU-19F 0.468" 0.625" GAS

HR-181B 1.11" 1.325" GAS

HR-190A 1.11" 1.375" GAS

HR-191G 1.195" 1.355" GAS

 

[Bigmac]

Some Tillotson carb info I found on the interwebs:

Part # Venturi/Throttle/ Fuel Type

HL-166B 0.625 0.81 GAS

HL-166C 0.625 0.81 GAS

HL-357A 0.625 0.81 GAS

HL-357B 0.625 0.81 ALKY

HL-334A 0.75 1 " GAS

HL-365A 0.75 1 " GAS

HL-306BR 0.75 1 " GAS

HL-383A 0.75 1 " GAS

HL-324A 0.75 1 " GAS

HL-304E 0.75 1 " GAS

HL-314G 0.75 1 " GAS

HL-314F 0.75 1 " ALKY

HL-374A 0.75 1 " ALKY

HL-348E 0.75 1 " ALKY

HL-355E 0.945 1.06 " ALKY

HL-360A 0.945 1.06 " GAS

HL-360B 0.945 1.06 " GAS

HL-360C 0.945 1.06 " ALKY

HL-363 0.945 1.06 " ALKY

HL-380A 1" 1.125" ALKY

HL-380B 1" 1.125" GAS

HT-5A 0.9" 1.06" GAS

HT-8A 0.9" 1.06" GAS

HS-175D 0.69" 0.81" GAS

HS-230D 0.69" 0.81" GAS

HS-205A 0.69" 0.81" GAS

HU-63C 0.468" 0.625" GAS

HU-19F 0.468" 0.625" GAS

HR-181B 1.11" 1.325" GAS

HR-190A 1.11" 1.375" GAS

HR-191G 1.195" 1.355" GAS

Great info! I got an hl324a, going to try it on the 797, got the low profile base, hopefully it will work out

 

[jacob j.]

Another 125c video for poops and giggles:

 

[Frank bierce]

Another 125c video for poops and giggles:

Pure music!!

 

[Bigmac]

Figured I’d share this on this section, probably gonna try it on my stock 125 and see what it does. Have been wanting to try this with the OEM intake manifold for a while, the stock manifold seemed like it had some dead air pockets,So I’m curious to see if they’ll be any gains from this, it should at least help throttle response.
I still have some finish work to do

 

[jacob j.]

Figured I’d share this on this section, probably gonna try it on my stock 125 and see what it does. Have been wanting to try this with the OEM intake manifold for a while, the stock manifold seemed like it had some dead air pockets,So I’m curious to see if they’ll be any gains from this, it should at least help throttle response.View attachment 247203 View attachment 247204View attachment 247205 View attachment 247202View attachment 247201
I still have some finish work to do

I'm digging that action. I think the stock manifold has a lot of room for improvement. Even the blocks themselves have a lot of pockets for dead space/dead air.

 

[Bigmac]

I'm digging that action. I think the stock manifold has a lot of room for improvement. Even the blocks themselves have a lot of pockets for dead space/dead air.

Thanks. Agreed on the block, may address some of those on a new build, it’s a lot of epoxy work! Lol

 

[PogoInTheWoods]

...it’s a lot of epoxy work!

Sure is. Out of curiosity, do you use some kind of slow heat process for curing, just let it sit, do layers, a little of each...?

 

[Bigmac]

Sure is. Out of curiosity, do you use some kind of slow heat process for curing, just let it sit, do layers, a little of each...?

I have been doing a little bit of both, but no heat to cure just give it time, And if I do layers I grind in between so there’s something to bond to

 

[PogoInTheWoods]

Gotcha. You're a patient man! I hope your results bear out the fundamental idea behind the effort.

 

[Frank bierce]

Figured I’d share this on this section, probably gonna try it on my stock 125 and see what it does. Have been wanting to try this with the OEM intake manifold for a while, the stock manifold seemed like it had some dead air pockets,So I’m curious to see if they’ll be any gains from this, it should at least help throttle response.View attachment 247203 View attachment 247204View attachment 247205 View attachment 247202View attachment 247201
I still have some finish work to do

great idea!! Seems like it would help with intake turbulence quite a bit. Will be curios today see how it responds.

 

[Bigmac]

great idea!! Seems like it would help with intake turbulence quite a bit. Will be curios today see how it responds.

That’s been my thinking Frank, hopefully it plays out and works! LOL

 

[jacob j.]

A few teaser pictures:

 

[jacob j.]

 

[jacob j.]

 

[Frank bierce]

Looking beautiful!!

 

[Lee H]

Well Jacob, You unraveled a mystery for me. The first pic in this last post. Your cylinder cover has a
reinforcement repair part for the lower screw for the fan housing. I have a few and never knew what
they were for. Thanks Buddy.