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Karburátor 26mm YAMAHA DT/CT 125/175

  • daniel-jaros
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Karburátor 26mm YAMAHA DT/CT 125/175 was created by daniel-jaros

Hello. Does anyone have experience installing a 26mm carburetor on a YAMAHA DT/CT 125/175?
Will it have any effect or sense if the carburettor is changed from 24mm to 26mm?
Thank you Daniel Czech Republic
05 Jun 2023 11:50 #1

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Replied by Yamfan on topic Karburátor 26mm YAMAHA DT/CT 125/175

Transfer ducts, and reed cages are both quite restrictive on these engines, and improving those areas, will mean a bigger carb will work much better.
05 Jun 2023 13:06 #2

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Replied by MarkT on topic Karburátor 26mm YAMAHA DT/CT 125/175

A few of the members here ran a CT3 175 at El Mirage for a land speed record. Some of the best speeds (over 90 mph!) were attained with a 24mm carb.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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05 Jun 2023 16:45 #3

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Replied by daniel-jaros on topic Karburátor 26mm YAMAHA DT/CT 125/175

Okay, thank you for the answer.If a 26mm carburetor is fitted to the stock engine without modification will it have the effect of improving it?Or can you modify the velocity channels and air butterfly valves?Thank you
05 Jun 2023 20:48 #4

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Replied by daniel-jaros on topic Karburátor 26mm YAMAHA DT/CT 125/175

Okay, thank you for the answer.To reach 90mph what adjustments are made?
05 Jun 2023 20:54 #5

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Replied by automan on topic Karburátor 26mm YAMAHA DT/CT 125/175

Tailwind and gearing.
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05 Jun 2023 22:16 #6

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Replied by Yamfan on topic Karburátor 26mm YAMAHA DT/CT 125/175

26mm carb alone, will make very little difference. With a bigger reed block, and large volume free flow air box, the bigger carb will make a difference.
05 Jun 2023 23:06 #7

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  • RT325
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Replied by RT325 on topic Karburátor 26mm YAMAHA DT/CT 125/175

Computers or website is playing up. Hope this posts.
Ok Mark ya going to have to tell us all the trick now lol [& your tricks too]. Could be a very technical & interesting story. [But super interesting]. Pics too of the record setting attempts please.
Ok, you can have an escape clause if not easy to do. All good.













































































































 
Last edit: 06 Jun 2023 05:21 by RT325.
05 Jun 2023 23:28 #8

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Replied by Yamfan on topic Karburátor 26mm YAMAHA DT/CT 125/175

Would think that for 90mph, unless the bike is fully faired and very low, its going to need around 30hp?  That's very impressive for a CT3 with a 24mm carb fitted!
06 Jun 2023 04:00 #9

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Replied by RT325 on topic Karburátor 26mm YAMAHA DT/CT 125/175

Found it. MarkT will chime in i'm sure. I'll enjoy reading this again. & thanks to Mark for posting it a few year back.
I'll link it direct if i can. Was back in 2014 by the looks. Hope it works my damn computer's being grumpy.
Hope its not passing on infection things whatever ya call them.
Don't think i have an antivirus except built in windows defender so the kids tell me.
Never have an issue untill now lol. Never say never.
yamaha-enduros.com/index.php/forums/gene...st-ct3-some-day#4130
Last edit: 06 Jun 2023 05:54 by RT325.
06 Jun 2023 05:35 #10

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