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Makotosun

yamaha gt50 1974 no throttle (help)

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

If you are sure you have no blocked jets in the carb, it is time to look at the reeds and crank seals.
23 May 2024 14:52 #11

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

Ok sounds stupid on my part to even think it but I've seen once only someone drop the needle down the spout then put the slide in on top. I'm sure you wouldn't do 'that'. So forget that & try removing the needle & fit the slide without it in which case it should go super rich--just to prove a point.
23 May 2024 15:27 #12

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

& as Tinkicker says, check reeds. Any broken reeds like a big pieces missing. Think you replaced jets with similar but not used a long main jet & it's sitting against the bowl base.
23 May 2024 15:30 #13

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

Took the cluch case off sealed everything compressor giving air to the engine and soapy water to both crankseals and no vacuum leak anywhere did it after some dispair today xD
23 May 2024 15:34 #14

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

But for some reason i have a feeling that tells me i did something wrong. Because the sound changed again like more dry sound ??
23 May 2024 15:36 #15

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

You mentioned air screw & fuel screw but one just lifts the slide same as opening the throttle & other on an angle 'is' an air jet adjustment screw on the pilot jet. But no matter so shut up 'me' lol. Let's get it revving.
23 May 2024 15:38 #16

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

The fuel screw (engine side) enters in a angle to the pilot jet "hole" inside the carb, 1&half turns +- it gets the best idle. The air screw needs to fe fairly tight or won't idle like 1&half turns also. So maybe just maybe do you thing i put the float to low so its getting little fuel and as soon as the needle goes up its to much air for little fuel and it dies?
23 May 2024 15:43 #17

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

And the reeds i checked them and they looked fine like they are springy and don't seem to have any wear
23 May 2024 15:45 #18

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Replied by Ht1kid on topic yamaha gt50 1974 no throttle (help)

Pictures and a video of it running would help to find you a solution. You have to use a third party Imgur, google photos or YouTube etc 
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23 May 2024 16:54 #19

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

Not piston in backwards!! with skirt holes towards exhaust. Have seen that before & if you got it running it'd be all up the creek & hollow gaspy needing choke most likely.
23 May 2024 18:58 #20

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