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Basic Carb set up question on 26mm Mikuni
Posted: Wed Aug 19, 2015 12:07 pm
by jedan71
I know carb jetting questions get asked all the timev with great effect so I am just looking for the basic ball park jet values to start from. I have 66mm steel liner small block barrel ( from Mutley) also to run a scootrs pipe on it and i have just sourced a 26TM Mikuni carb, with Li150 box with 16/47 setup, hopefully for a pokey tourer setup.
This is my firsy time with a flat slide mikuni. I am unsure till i strip it down whats in it? if anyone got some good solid figures so i can get started an with, and then with movement for up and down once i get it on on the dyno it would be really appreciated.
Thank you for any feedback.....
Re: Basic Carb set up question on 26mm Mikuni
Posted: Wed Aug 19, 2015 6:00 pm
by storkfoot
Are you sure it's a 26? I've used a TM24 before and I know there's a 28 flat slide TM too but I have never heard of a 26 version.
Re: Basic Carb set up question on 26mm Mikuni
Posted: Wed Aug 19, 2015 6:47 pm
by corrado
I've got a TMX27, great carb, D slide. Never come across a 26 except VM26 roundslide.
Re: Basic Carb set up question on 26mm Mikuni
Posted: Thu Aug 20, 2015 11:19 am
by jedan71
Measured internal diameter at 26mm of manifold side, was told a 26mm, the main jet looks like a 175, having difficulty reading the atomizer number, looks like 252, hopefully theses numbers make sense.Thanks
Re: Basic Carb set up question on 26mm Mikuni
Posted: Thu Aug 20, 2015 4:11 pm
by YAMLAM
have a look here and remeasure the outside Dia of the rear spigot ( i think on the link they got the front an rear spigot dia`s arse about).
should be 31mm if its a TM 24.
Re: Basic Carb set up question on 26mm Mikuni
Posted: Sat Aug 22, 2015 11:06 am
by jedan71
Hi Yamlam got the old digital gauge out, 33mm for the outer diameter on the spigot side of the carb, with a 25.98mm inner diameter..does this make any more sense?
Re: Basic Carb set up question on 26mm Mikuni
Posted: Sun Aug 23, 2015 12:43 pm
by jedan71
After further Googling, i found that an outer diameter on the spigot side of 33mm and a outer diameter of the inlet side of 44mm, it is a VM28 model in the TM flat series. Hence your confusion. Thank you for helping me clear this up.
Does anyone have some basic jetting sizes for it? As the sizes mentioned on other sites are confusing saying 300-340 when i have 282, is that a large jump in sizes
Re: Basic Carb set up question on 26mm Mikuni
Posted: Sun Aug 23, 2015 8:52 pm
by YAMLAM
i dont think the Vm28 is a popular choice in the uk, so jetting advice might be a bit hard to come by.
Re: Basic Carb set up question on 26mm Mikuni
Posted: Sun Aug 23, 2015 8:58 pm
by YAMLAM
just done a search on here and found this but not a lot else.
http://scooterotica.org/forum/viewtopic ... ikuni+VM28
Re: Basic Carb set up question on 26mm Mikuni
Posted: Sun Aug 23, 2015 9:01 pm
by jedan71
Thanks Yamlam, I think I will have to Google and just get a wide range of jets and go slowly,
the joys of living on the other side of the planet.