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TOPIC: TY80A Tekei carb.

TY80A Tekei carb. 13 Mar 2019 18:31 #1

  • PDXtyist
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Hello sirs.
After my TY80A began to run very poorly and would barely start, I decided to take the Tekei carby apart and clean it. I also changed the reeds. I couldn’t get the bike to start, post rebuild, and finally decided to screw the air screw all the way in. Bike starts and runs better with air screw almost completely seated in.
My question is: Is this a true indicator that the Pilot Jet needs to be larger than the no. 34 installed?
Am I overlooking something?
Thank you.

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TY80A Tekei carb. 13 Mar 2019 19:19 #2

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If it used to run decent I'd be looking for an air leak.
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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

TY80A Tekei carb. 13 Mar 2019 19:58 #3

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+1 on a leakdown/vacuum test
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TY80A Tekei carb. 13 Mar 2019 20:01 #4

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Yes, either air leak, from who knows where, could be left crank seal, or partially restricted pilot jet. Did you take it out & poke a thin wire brush strand through it, if you can find a strand thin enough. Not base gasket broken & sucked in or blown out. Think they were a clamp type carb so is it clamping tight & right home on the flange thingy.
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TY80A Tekei carb. 14 Mar 2019 15:18 #5

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I poke my pilot jets with monofilament fishing line so as not to gouge the orifice.
Lol
Almost sounds painful.
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Schu

"If it's possible to do it two ways, do it the other way first to save time"

TY80A Tekei carb. 07 Apr 2019 09:22 #6

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Ok. New points. Timed to 2mm BTDC and while at it, new seal on mag side. Starts and runs super well. But, at approx full throttle she skips and hesitates a bit.
All original jetting and needle position. Floats ht. at spec.
Main Jet?
It’s not a super big issue as she runs super well at “trials” power with an adult on her. But.....very curious and interested in her carburation.

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