$13 Tillotson Carburetor Venturi Size Measurements + 420cc Engine Performance Build Candidates!

This video measures the venturi and bore of the HL Tillotson Carburetor clones. Some carburetors are marked "Tillotson". They are available online for just under $14. These are intended for chainsaws, but they add great performance on Honda & Predator 212, 223, and 224 clone engines.
Tillotson style carburetor link:
www.amazon.com/dp/B018I9CI2W?...
Harley Davidson Golf Cart Replacement Carburetor: www.amazon.com/gp/product/B07...
Long Reach ID measuring set used in the video: www.amazon.com/dp/B08XBBXKNR?...
So, how did they measure up?:
FULIN = .750 venturi with a 1" Throttle Bore
Tillotson "marked" Clone = .785 venturi with a 1" Throttle Bore
HD Golf Cart Replacement Carburetor = .865 venturi with a 1" Throttle Bore (This one was $19.99)
The product title for the Tillotson carburetor in the first link is "YOFMOO Carburetor Carb Compatible for Stihl"
The first carb I received was the "FULIN" brand. I was pleased with it and ordered another. The next carburetor I received, from the same link listed above, was branded "Tillotson" and had a larger venturi. I've ordered more since then and have been receiving carbs branded "Tillotson". Keep in mind these are Tillotson "clone" carburetors and NOT likely to be genuine. It's my belief that they are likely using genuine Tillotson block stacks on a cloned carb body. Get these while you can, if nothing else they're worth the price even if used for replacement parts.
The Harley Golf Cart Replacement Carb was from the "Rop Shop" I ordered thru the Jungle site.
Two of these are chainsaw replacement carburetors and one is a replacement carburetor for a Harley Davidson Golf Cart. The performance gain of installing one on a 212 DUCAR or 212 Predator is definitely worth a look.
Are they worth the price? I think so. How much do they cost? Well, that may change, but I paid less than $15 each for 2 of these carbs including the tax and shipping. The Golf Cart Carburetor was $19.99. I don't know what the current price will be when you see this video but I'll put the link where I ordered mine if anybody wants to check them out. I will likely be buying a few more of these for other projects as the Tillotson style diaphragm pump carburetors are among my favorites. One of the LCT 179cc engine builds coming up may receive a Tillotson as well!
There will definitely be more videos made on these Tillotson clone carburetors. Some ideas I would like to try: Add a 2nd pump stack and see if I can get one of these gas carbs to run methanol fuel. Maybe add a 3rd pump stack triple pumper experiment? The Predator Ghost 212 would also benefit from a Tillotson pumper type carburetor. The venturi size on some of these Tillotson carburetors is larger than the venturi size of the Predator Ghost 212.
I added a couple of brief clips at the end of some possible upcoming projects. I have several gas generators I really should get going. And my boys also uncovered a couple of 420cc Predator engines I had stored away in the barn that I'd forgotten about. I was thinking there should be a 301cc engine stored somewhere. This might get interesting....
If you guys want to have a look inside these Tillotson carburetors check out ‪@KainKustomGarage‬ Dan has lots of great videos on rebuilding/restoring these HL Tillotson carburetors and many others. Since these are intended to be "chainsaw carburetors" makes perfect sense to check out a premier chainsaw guy!
If you guys enjoy Racing Karts and Race Video Footage be sure to check out ‪@franksoutdoorlife‬ Frank has lots of great Kart racing videos with excellent commentary.
Thanks, Chris "Kentucky Fried Fixes"
Easter Egg in the video: Did you notice I was being attacked by a mosquito the size of a small bird in the video opening scenes? Well ok, maybe it wasn't that big but he did seem determined to have a bite. No mosquitos were harmed or injured during the making of this video. It wasn't from a lack of trying though.
#tillotson #kartracing #predator212

[@samsgarage1716]

You do so much great work on these little engines. I’m going to make a custom manifold to fit a mikuni carburetor on a 49cc engine.

[@KentuckyFriedFixes]

Sam that performance two stroke you built for Little Sam's BMW kart already rips!

[@samsgarage1716]

@@KentuckyFriedFixes it’s going to be for little red.

[@KentuckyFriedFixes]

I just watched the Jordan Park video, great stuff. The little red kart was flying when you were stuck on full throttle! LOL! Little Sam probably needs to be put into a race kart in a few years. That young man is gonna be a driver!

[@heathenprojects2639]

I have a late 60s Harley 3 wheel cart that was gave to me from an old nieghbor old shark nose never messed with it its neat little cart just never got to messing with it

[@KentuckyFriedFixes]

I'd love to have an older golf cart. I watched some of MissouriOldTimer's videos on a Predator swap he did on a golf cart. It looked like a blast!

[@heathenprojects2639]

@@KentuckyFriedFixes swaps are pretty easy cushman are in my opinion better spent money

[@gravelyman]

I learn something new in all your videos. Keep up the good videos 👍

[@KentuckyFriedFixes]

Thank you Sir! I appreciate you!

[@j.finesseflights1403]

Love the content! You try different things and make it work! Pioneer...

[@KentuckyFriedFixes]

Always looking for more power. For less $ if possible! Thanks!

[@Greybuiltracing]

You said “jungle “ instead of Amazon !! lol ! Love your videos bro 🙏🏻

[@KentuckyFriedFixes]

Love your videos as well my friend. I'm a big fan.

[@Greybuiltracing]

@@KentuckyFriedFixesI’m honored!! Ty for the support !!!!! 🙏🏻

[@franksoutdoorlife]

Build a 420 with a tillotson maybe ? Have a good day sir.

[@KentuckyFriedFixes]

We may do something with a 420 soon. Thanks Frank!

[@jamesgravel7755]

I just used the Harley one on a 196. Worked pretty good. I modified the throttle and removed the choke. Had to drill the jet out to .045” and it was a good runner. But I just got a mofuan. Idk how to spell it and it seems to be much better quality. Got it off temu for 13$. I think they are better than a PWK style. And you make a few parts and it works. Fun to mess with

[@KentuckyFriedFixes]

Hi James! I love these little carbs! They're cheap enough to play with even if you have to buy the $50 intake. (Really cheap if you make your own intake) Much better performance with Methanol fuel than the VM-22 or PWK slide carbs. I'd love to see a Tillotson style pumper carb with a slide instead of a butterfly. EC has the parts if you want to double or triple stack the pump as well. Closest thing to fuel injection I've seen.

[@jamesgravel7755]

The 7$ intake off temu or Amazon for a clone engine. Fits perfectly if you dremal put a small divet for the pulse port. So have you run one with methanol without drilling out any ports. I have it detuned to run a 200cc on gas so it seems like I can get it to flow more than double the fuel for methanol without any major modifications. I have the pivot arm bent for half travel and the hi/lo out 1 turn or less and it still runs fairly rich. I think they would work good on methanol.

[@KentuckyFriedFixes]

Hi James! I've not converted any of the clone Tillotson carbs for Methanol use. I do have several Methanol Tillotsons (the real ones). It's a great idea to try on the cheapies because it won't break the bank if an experiment goes wrong. Please be careful if you get into drilling for Methanol use, once holes are made, you can't go back. Another important thing to consider would be to change the internal diaphragms to some made from Methanol friendly material, and adding a 2nd pump block. (stack the pumps, two is good, three is better if your engine can handle the fuel, EC has the plates you need available) Setting the popoff is very important for fuel control as well. My last Blockzilla was a three pump stack and would actually spit raw Methanol fuel out of the exhaust at idle. If you're interested in building Methanol Tilly carbs, I'd suggest buying a Methanol Tilly from EC first, then compare what they did to theirs to what you need to do to yours. Building Methanol Tillotson carbs is really an art. It can be done and you will get good with practice but I'm not ashamed to admit the last Methanol Tilly I ran on my open Blockzilla came from EC and was also race prepped by EC for my engine. They're the best.

[@jamesgravel7755]

Thanks KFF. That’s good advice. I have not yet tried doing more stacks. But I was looking into how to do it. I was thinking of just buying one from EC and seeing what’s going on inside. Definitely subbed to the channel. Have a good one

[@fanofoldfans9238]

Great idea! So how did the Predator 212 run with the clone Tillotson pumper carb? What manifold works and a/f adapter?

[@KentuckyFriedFixes]

Hi Don! I used this one on the Ducar 212 engine Build. There's a clip of it running either in the last Ducar 212 engine build video or the fuel pump install video. Maybe both? It runs great! It can really pop if you have the fuel screws turned up. These little Tilly clone carbs are awesome runners. Add an extra plate and double stack for more fuel if you're building a fire breather. I love these little carbs. Closest thing I've found to fuel injection performance for a small engine. The manifold came from Turk Brothers on this one but EC carbs or ARC probably has them too. The intake is roughly $50 and that stinks, but still worth it. (Or you can make a home made intake cheaper, just remember to include the small vacuum hole for the carb pump) Although this one is set up for gasoline, the Tillotson alcohol carbs always made the most power for my open kart. I love them.

[@igokarts4510]

Someone say big block? 420? 301?

[@KentuckyFriedFixes]

The boys dug up a couple of 420 Predators from the barn. I'd forgotten about having those engines. There should be a 301 in there somewhere if it hasn't been "borrowed". Looks like we may step into Big Block territory soon. LOL! Thanks!

[@charlesb23]

👍

[@Deans64]

hi kff do you think the tilloson carb will be to much gas for a 5 hp b/s only intak i found is a b/s to tilloson carb

[@KentuckyFriedFixes]

Kevin the Tillotson works hand in hand with a 5HP Briggs flatty. They're made for each other, especially if you run Methanol fuel! Gasoline works fine as well but they really shine on Methanol. Just remember to keep the venturi size below 1" if you have stock valves and you'll be tickled pink!

[@jameshufffman8920]

Hey bro. Can you tell me what air filter adapter you use for those carbs?

[@KentuckyFriedFixes]

Hi James! That's a great question and I've decided to make a video on the air filter adapter part numbers. The filter adapter I used on the Tillotson clone carb is part # 308VS purchased at EC Carburetors but it is wrong for the carb I ended up using. The ID on the adapter is a bit smaller than the air horn of the carb but larger than the venturi. It will work, but the ID on the adapter really should be opened up a little to match the carb air horn. At least the bolt spacing is correct. The dimensions on this one are 2.5" OD for the filter, .913" on the ID and the bolt spacing is 1.375" fitted with 10-32 fasteners. I did remove the choke butterfly and shaft from my carb as the Tilly's don't need a choke as they pump plenty of fuel for a cold start, the choke shaft and butterfly is just blocking air flow. I think the correct part # 302VS would be a much better match. The video will be out tomorrow.

[@jameshufffman8920]

Awesome bro. Appreciate you bud.

[@jameshufffman8920]

@@KentuckyFriedFixes was also wondering how you hooked up choke. So just remove it. Ok will do. Thank you lots bud.

[@KentuckyFriedFixes]

Yes Sir! We don't need no choke on our $14 Tilly!

[@JohnOgdenJr]

Do you like the tillotson Over the vm22?

[@KentuckyFriedFixes]

Hi Oggie Outdoors! Both carbs have advantages and I do love both. It boils down to the application. For max air flow on a mini bike application you can't beat a slide carb, but for kart racing with a Methanol engine it's hard to beat a Tillotson double stack pumper carb. I've tried both on an open Blockzilla years ago, the double stack Tillotson performed better than the slide carb with Methanol as it actually pumps more fuel into the engine. The Tillotson carbs are essentially a diaphragm pump type fuel injection.

[@JohnOgdenJr]

@@KentuckyFriedFixes thanks, my 224 build is going in a big tire mini bike that will see some circle track racing. I’m building it up like you’re ducar with the mongoose cam. I order the tilly carb but if it doesn’t work out it’s cheap enough to put away for another build. Then I may try the round slide nibbi carb.

[@KentuckyFriedFixes]

@@JohnOgdenJr The Tilly should be great for a 224. The only thing that irks me is the price of the intake. $50 is a lot IMO. I will likely throw some homemade intakes together with some 1" pipe and a couple of large washers from the TSC store. You could do the same thing. I've seen your videos on the Enduro Harley, so I know you have the skills. The Nibbi carbs look NICE, but they're a bit pricey for my projects. I have to try and keep the costs down to a reasonable amount per engine as much as I can. These projects are mostly for mini bikes and yard karts. Now if I was going racing again, I wouldn't be as "frugal minded" LOL! Thanks man!

[@JohnOgdenJr]

@@KentuckyFriedFixes I have a chunk of 1/2" aluminum, may try to redneck me up a carb intake.

[@Deans64]

how come i see some guy do pop off pressure on carb

[@KentuckyFriedFixes]

Hi Kevin! If you're building one for competition it's a good idea to do the pop off check to test for leaks at or around the needle. It can also tell you if the carb is working correctly as well (air leak or busted diaphragm). If you get into the Tilly carbs and building them for performance applications it's a good idea to have a vacuum/pressure tester pump. There's a complete test kit made specifically for this but it's a little pricy. You can always come up with a few fittings that will work with a low cost vacuum/pressure test pump kit though and achieve the same results.

[@Deans64]

i wish for comp but i probably get beat by granny

[@KentuckyFriedFixes]

LOL! Now Kevin, Tillotsons are like everything else. Don't be afraid to experiment. I've never met anyone that didn't make a few mistakes while learning something new (especially me, I've made tons of mistakes and still do). With some practice and figuring out what works for you and what doesn't, you'll be building multi stack racing Tillys in no time!

[@nitroman365]

Hello. I have a ducar stage 2 with .009 head gasket and authentic Mikuni VM22 with 140 main and 15 pilot. I have a dead spot when I crack the throttle. Any suggestions? Thank you!

[@nitroman365]

Mod 2 cam as well.

[@KentuckyFriedFixes]

Hi Nitroman365! If there are no vacuum leaks and if you're getting a lean spot near idle, it could be the air mix screw out of adjustment or, the pilot jet is a bit small. If you're running a 140 main and it seems to be running good, I'd bet you need at least a size 20 idle jet or larger. You'll have to do the adjustment on the air mix and count the turns when you've got it adjusted to the best setting you can get out of it. Remember to count the turns it takes to close the air mix screw. If it's less than 1 turn, the idle jet is too lean. More than 2 turns and the idle jet is too rich. I'll bet your idle jet is too small.

[@KentuckyFriedFixes]

Also, make sure you check out my "How to Tune the VM22 Mikuni Clone" video. It has a lot of important details in the description as well as a link to a PDF file for tuning those.