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#46 |
Join Date: Aug 2022
Location: Lincoln CA
Posts: 129
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Putting the float bowl back on this carb is just a bit fiddly. I start the stand-off tube into the well in the bowl and then gently help the bowl find its way home at a slight angle until everything goes freely. If you're not careful to do that, it would be fairly easy to knock your float level out of adjustment.
Don't get yourself too worked up over it. Making little mistakes and learning from them is how you know better than to make them next time.
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-2024 CSC TT250, stage 3 motocult kit, Nibbi PE28FL with custom-made cable controlled choke, modified stock muffler (larger diameter tailpipe), custom oil cooler installation with relocated stock evaporative emissions canister, oversized stainless steel footpegs, IMS folding tip shifter, a few little blingy bolts and bits. More personal preference mods to come. |
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#47 | |
Join Date: Jun 2023
Location: Big Piney, WY
Posts: 561
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Quote:
I think this is a good "base tune". I think your 35 pilot is too lean. If I were you, I'd go back to this tune and try dropping the main jet one at a time and see if things don't improve.
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2023 Hawk 250 from XPRO off of Amazon MOUNTAIN MAN RC + MOTO on YouTube "If there were more bloody noses, there would be less wars." - Hagbard Celine "Someday, after mastering the waves, the winds, the tides and gravity, we shall harness for God the energies of love and then, for the second time in the history of the world, man will have discovered fire." - Pierre Teilhard de Chardin |
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#48 | |
Join Date: Oct 2023
Posts: 40
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Quote:
I ordered a float gauge. I'm going to set it at 19 like the factory manual says and go from there. Until then I put the stock carb back on so I can get around the city. 35 pilot 112 main needle 4. (Fuel screw about 3 1/2 turns out.) |
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#49 |
Join Date: Aug 2013
Posts: 269
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Mid throttle issues are usually caused by jet needle height.
Most of the time it's set to too rich, as too lean will work but with lower power. Too rich will feel like a more abrupt power loss. |
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#50 | |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,601
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So what have you decided to buy??
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-NOS 2020 KTM 250SX (2-stroke motocross) |
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#51 |
Join Date: Oct 2023
Posts: 40
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Nibbi PEZ28. Direct fit for a hawk/tt250 Here is a link to it. https://nibbiracing.com/products/pez...waAjo-EALw_wcB |
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#52 | |
Join Date: Jun 2023
Location: Big Piney, WY
Posts: 561
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Quote:
I think Thumper is wondering what kinda pumper carb are you gonna buy?
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2023 Hawk 250 from XPRO off of Amazon MOUNTAIN MAN RC + MOTO on YouTube "If there were more bloody noses, there would be less wars." - Hagbard Celine "Someday, after mastering the waves, the winds, the tides and gravity, we shall harness for God the energies of love and then, for the second time in the history of the world, man will have discovered fire." - Pierre Teilhard de Chardin |
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#53 |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,601
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I'm thinking best way out is a new Nibbi PE28. It doesn't have the throttle pump, but would probably be easier to set up.
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-NOS 2020 KTM 250SX (2-stroke motocross) |
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#55 |
Join Date: Oct 2023
Posts: 40
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Zero to full throttle rips on the stock carburetor. Barely any hesitation. Comes right back to idle.
My tt250 has never run this well. Maybe my answer is to just leave the stock carb on lol. Stock carb. 35 idle jet Main jet 112 Needle position 4 Fuel screw 2 3/4 turns out. Here's a video. |
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#56 |
Join Date: Jun 2023
Location: Big Piney, WY
Posts: 561
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![]() I'll give a thumbs up to the stock carb, although I don't like where your fuel screw is at; 2 3/4 turns out. I'm starting to think these Nibbi's aren't all they're cracked up to be. I think I made mine as good as it's gonna get with the JJH needle. Megadan switched to a Mikuni or a Mikuni clone...starting to think about going that route.
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2023 Hawk 250 from XPRO off of Amazon MOUNTAIN MAN RC + MOTO on YouTube "If there were more bloody noses, there would be less wars." - Hagbard Celine "Someday, after mastering the waves, the winds, the tides and gravity, we shall harness for God the energies of love and then, for the second time in the history of the world, man will have discovered fire." - Pierre Teilhard de Chardin |
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#57 | |
Join Date: Feb 2021
Posts: 994
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Quote:
thing is they often buy the PE30, and put it on a stock bike, with stock exhaust, and wonder why they can't tune it. |
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#58 | |
Join Date: Feb 2021
Location: Kansas City
Posts: 2,601
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Or reinstall the original PE28 carb in you high performance CG230 clone.
![]() Glad that worked. The simpler way to higher hp is a 172FMM (20hp) In a different bike. For about the same price, or less. We Quote:
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-NOS 2020 KTM 250SX (2-stroke motocross) |
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