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In the final stages of restoring my 97 YZ125. The slide in the carb is pretty worn to the point the majority of the chrome is flaked off the sides. The part is NLA from Yamaha, dosen’t cross reference with any other brands and Carb Parts Warehouse and Sudco said I’m SOL, so it looks like it’s time for a replacement. (For reference it’s a Mikuni TMXx 36)
From what I’ve gather the Keihin PWK Air Stryker is the way to go, I’m at a cross roads though as not sure if I should stick with a 36mm or upgrade to a 38. Bike will be ridden/raced vintage moto 3-5 times per year. The majority of the 38mm I’m finding come with a #7 slide which will be way to lean for the little 125. Replacement slides can be had but for around 60-70 bucks. My other option is a 39mm from a mid 00’s KTM which is also a PWK Carb (Non a/s) 5.5 slide, and plenty to be found for around 100 bones. Also have a bunch of extra Keihin jets in the garage so that would make it much easier.
I’m all ears for suggestions or thoughts.
From what I’ve gather the Keihin PWK Air Stryker is the way to go, I’m at a cross roads though as not sure if I should stick with a 36mm or upgrade to a 38. Bike will be ridden/raced vintage moto 3-5 times per year. The majority of the 38mm I’m finding come with a #7 slide which will be way to lean for the little 125. Replacement slides can be had but for around 60-70 bucks. My other option is a 39mm from a mid 00’s KTM which is also a PWK Carb (Non a/s) 5.5 slide, and plenty to be found for around 100 bones. Also have a bunch of extra Keihin jets in the garage so that would make it much easier.
I’m all ears for suggestions or thoughts.
I have bored 125 carbs before to give more mid-top end but it gets peakie
The Shop
Premix, I believe the carb on your 97' yz125 is an older style std TMX and not the updated TMX-x.
TMX--https://www.partzilla.com/catalog/yamaha/motorcycle/1997/yz125-yz125j1/…
TMX-x--https://www.partzilla.com/catalog/yamaha/motorcycle/2011/yz125-yz125a1/…
I believe this is the slide you are looking for,https://www.frankmxparts.com/epages/62910900.sf/en_US/?ObjectPath=/Shop… but call first to verify, as the slide for the Honda only TMX is still being sold.
Opinions on those two options? Bike is a stock rebuild motor running on C-12. Moto only.
Something else to think about is the fact that the TMX-x carb is somewhere around 15mm shorter than your current TMX carb. I think the TMX-x is 76mm while the TMX is 90mm in length.
Here’s the jetting I’m running. It could be richened up even more. I may try a richer needle but for the 80 degree plus days this worked well. Running 32:1 with VP110
P-50
M- 180
Slide-7
AS-2.5
Needle. DDJ 2nd clip.
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