<![CDATA[Jet sizes]]>Again!
I believe (from searching) that the standard 28mm flatside carb is 210? (Mine has what appears to be a 180) I want to get the standard size jets as a jumping off point, can anyone tell me the standard main and pilot jet sizes please?
I have searched for both with nothing on the pilot...

P.S. are the needles marked for size, and if they are, how/where?...

Cheers!...

]]>https://dt125r.co.uk/topic/2500/jet-sizesRSS for NodeFri, 07 Aug 2026 11:02:47 GMTSun, 06 Dec 2020 15:11:00 GMT60<![CDATA[Reply to Jet sizes on Fri, 16 Apr 2021 15:42:57 GMT]]>I’m guessing that people are still running the power jets on their carbs when they state main jet sizes?...

]]>https://dt125r.co.uk/post/26278https://dt125r.co.uk/post/26278Fri, 16 Apr 2021 15:42:57 GMT<![CDATA[Reply to Jet sizes on Tue, 08 Dec 2020 04:11:24 GMT]]>@spookdog

I would say your best bet for Jetting would be starting with a 210 main jet found in 04 to 07 models. Set the needle clip one up for the lowest position, wind the air mixture screw (from all the way in) to around a 1/4 turn and start from there!

** assuming you’ve got a standard Mikuni TM28 Flatslide Carb!

]]>https://dt125r.co.uk/post/25531https://dt125r.co.uk/post/25531Tue, 08 Dec 2020 04:11:24 GMT<![CDATA[Reply to Jet sizes on Sun, 06 Dec 2020 17:18:40 GMT]]>I think most UK Specs are 3BN cases, very early '88 years ran 3BN cylinders.

]]>https://dt125r.co.uk/post/25524https://dt125r.co.uk/post/25524Sun, 06 Dec 2020 17:18:40 GMT<![CDATA[Reply to Jet sizes on Sun, 06 Dec 2020 16:27:44 GMT]]>@calum
That’s the thing, it’s such a mongrel. 3bn casings, 3mb barrel & head, flatslide carb (early ones had roundslide ‘stubby’ carbs, no?) So I don’t really know what to look for...

]]>https://dt125r.co.uk/post/25521https://dt125r.co.uk/post/25521Sun, 06 Dec 2020 16:27:44 GMT<![CDATA[Reply to Jet sizes on Sun, 06 Dec 2020 15:44:11 GMT]]>What year is your model?

Earlier DTRs ran 240 main jet. The later ones 210.

]]>https://dt125r.co.uk/post/25520https://dt125r.co.uk/post/25520Sun, 06 Dec 2020 15:44:11 GMT