Best gearing and fuel ratio for a 2022 TC65

mxjax813
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mxjax813
I'm sure this has been touched 100x by now. Looking to get the best fuel and gear ratio for my son. Hes on a 2022 TC 65 running the stock gearing and T2 fuel now. He's 8 and about 68lbs. He's done 3 races with it so far. Last year on his 50. Any help would be appreciated
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BikePilot
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BikePilot 7/19/2022 10:15am
7/19/2022 10:15am
My understanding is that going much richer on premix than 50:1 creates issues with the power valve operation. This is second hand info as we are still running a fiddy. Gearing I’m sure will be highly rider and track contingent.
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4DAIVIPAI2K5
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4DAIVIPAI2K5 7/19/2022 10:36am
7/19/2022 10:36am
We run stock grearing. Running av gas at 32:1 with amsoil.
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Dhallmark
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Dhallmark 7/19/2022 10:44am
7/19/2022 10:44am
Pump gas, amsoil dominator 45 ish : 1, stock gearing.
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AngryBear
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AngryBear 7/19/2022 10:58am
7/19/2022 10:58am
nihilo jetting kit for the bike. you can buy the parts yourself but it pulls the guesswork out. the new needle is what you are mostly seeing the results from, that alone will have it run much better. stock is too rich on bottom and too lean on top for most kids.

https://nihiloconcepts.com/products/ktm-husqvarna-gasgas-65-jet-kit?_pos=5&_sid=67c1dc4b4&_ss=r

t2 is really good but $$$. if not that i'd run the best pump i could find, and a good oil like amsoil @ 60/1, thats what the manual calls for. 50:1 is as much oil as i'd mix with pump gas. i was so scared of this when i started on 65's, but the manual calls for it and we've had no issues at all..

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drivrswntd
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drivrswntd 7/19/2022 11:02am
7/19/2022 11:02am
mxjax813 wrote:
I'm sure this has been touched 100x by now. Looking to get the best fuel and gear ratio for my son. Hes on a 2022 TC...
I'm sure this has been touched 100x by now. Looking to get the best fuel and gear ratio for my son. Hes on a 2022 TC 65 running the stock gearing and T2 fuel now. He's 8 and about 68lbs. He's done 3 races with it so far. Last year on his 50. Any help would be appreciated
Stock gearing 14/48 and we run either VP C12 50/50 Pump at 50:1 or U4.4 at same ratio's. U4.4 is great but you have to be careful when it gets hot and humid as the fuel will vapor lock and make the bikes hard starting.
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mikemike214
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mikemike214 7/19/2022 11:33am
7/19/2022 11:33am
I run stock gearing and 93 with dominator 60/1 and the Nihilo jet kit. I don’t see a need for race gas with these bikes and my kid doesn’t have trouble running up front locally.
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NorCal1975
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NorCal1975 7/19/2022 11:36am
7/19/2022 11:36am
Whatever you do just make sure the actual jetting is spot on. These little bikes like to "blow up" if they are run too lean and are ridden hard. Especially the little Kawisakis. I think the little Austrian bikes are a million times more reliable than a KX, but I still would argue jetting is much more critical on the little bikes because they live in the high RPM range with fast kids. I always try to run my kids bikes just a tiny hair on the rich side and then keep the air filters really clean. Will help you get a lot more hours out of a bottom end.
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wydopen
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wydopen 7/19/2022 12:36pm
7/19/2022 12:36pm
Nihilo jet kit and 91pump 60/1 with stock gearing
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Hi Side
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Hi Side 7/19/2022 2:33pm
7/19/2022 2:33pm
Stock gearing, VP VPR mixed with Motorex Cross Power 2T at 60:1.
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RY9MX
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RY9MX 7/19/2022 3:19pm
7/19/2022 3:19pm
Stock gearing and T2 with fmf pipe/silencer. I put in the nihilo carb baffle and their jet kit. With their recommended settings it was pretty rich. I had to lower the needle clip to the lowest spot. It was good here at sea level. Went to a lectron carb. Seems to run a little cleaner, and plugs always look great.
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mxjax813
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mxjax813 7/20/2022 3:58am
7/20/2022 3:58am
Thank you everyone! I really appreciate it
soopah noviss 7/20/2022 6:10am
7/20/2022 6:10am
Jb118117 wrote:
Pretty much what everyone else stated. Stock gearing, 93 pump gas mixed 50/50 with avgas and dominator 55:1. Tusk makes a jet kit that is the...
Pretty much what everyone else stated. Stock gearing, 93 pump gas mixed 50/50 with avgas and dominator 55:1. Tusk makes a jet kit that is the same as the Nihilo kit but cheaper.

https://www.rockymountainatvmc.com/parts/tusk-ktm-65sx-jet-kit-p?v=16662
Is it really the same?
Jb118117
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Jb118117 7/20/2022 6:20am
7/20/2022 6:20am
Jb118117 wrote:
Pretty much what everyone else stated. Stock gearing, 93 pump gas mixed 50/50 with avgas and dominator 55:1. Tusk makes a jet kit that is the...
Pretty much what everyone else stated. Stock gearing, 93 pump gas mixed 50/50 with avgas and dominator 55:1. Tusk makes a jet kit that is the same as the Nihilo kit but cheaper.

https://www.rockymountainatvmc.com/parts/tusk-ktm-65sx-jet-kit-p?v=16662
soopah noviss wrote:
Is it really the same?
Yes. It's a needle, pilot and main. Nihilo doesn't tell you what each one is. Tusk just figured out which ones Nihilo was using.
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ZOSICK
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ZOSICK 7/20/2022 10:20am
7/20/2022 10:20am
When my kid was on 65's, we ran one tooth up on the rear, 91 pump gas W/Motorex at 60:1. Jetting was tweaked a little and it ran great. We also had a Lectron carb for a bit and that worked well. We usually got 40 plus hours on the top ends with zero issues. Only real issues we had were the power valves breaking because they are weak.

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