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Makotosun

yamaha gt50 1974 no throttle (help)

  • muxus
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Replied by muxus on topic yamaha gt50 1974 no throttle (help)

imgur.com/a/raP5Iyj
imgur.com/a/25vxd53
imgur.com/a/TYXoWIf
24 May 2024 11:09 #21

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the carb entry with the circuit holes is air boot side
24 May 2024 11:11 #22

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Replied by muxus on topic yamaha gt50 1974 no throttle (help)

one of the pics shows the fuel in the bowl with the right float height thats the amount of fuel it closes at
24 May 2024 11:12 #23

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pilot is 34 main 90
24 May 2024 11:25 #24

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Replied by muxus on topic yamaha gt50 1974 no throttle (help)

Can it be.... a bad igniton coil?? o.o because no matter how the carb config is it will idle sometimes more rough than others but all the symptoms remain. So if the spark doesn't ignite all the fuel it can present as rich ??
24 May 2024 16:40 #25

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Replied by MarkT on topic yamaha gt50 1974 no throttle (help)

Have you tried a quality new spark plug gapped at 0.020"?
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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24 May 2024 17:18 #26

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Replied by RT325 on topic yamaha gt50 1974 no throttle (help)

Can only guess without a video & good audio but run it in the dark & look into the mag & see if there's more than a normal small arcing in the points, or for that matter any random sparks from shorting out somewhere else in there.
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24 May 2024 17:45 #27

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Someone said to me to replace the condenser because i had some arcing so i did but the magneto gets in front of the igniton points at tdc and i can't adjust them
25 May 2024 11:32 #28

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Replied by muxus on topic yamaha gt50 1974 no throttle (help)

Can you guys tell me how you adjusted your points, what i do is top death center lower 1.8mm then go back up until the tdc mark. And set them just opening but like how to you know they are just opening if they are not behind one of the magneto holes at that spot
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25 May 2024 12:23 #29

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Replied by MarkT on topic yamaha gt50 1974 no throttle (help)

Read the manual again and/or look for posts here on timing. 

Points are supposed to just open 1.8mm BTDC and the flywheel will never be in the way if you're doing it correctly.  You might be trying to set at 1.8 ATDC or something...  way retarded and yes, it won't run that way.
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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25 May 2024 13:54 #30

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