- This topic has 4 replies, 3 voices, and was last updated 3 weeks ago by ♠️ M77.
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Apr 30, 2026 at 8:19 PM #22446Bike Model = : HYOSUNG gt125 comet
Need some advice bike has fuel spark and compression but will not fire thank u in advance
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May 1, 2026 at 2:35 AM #22447
What year?
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May 1, 2026 at 4:47 AM #22448
It’s the 53 plate version
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May 1, 2026 at 2:55 PM #22452
Go halfords and buy the yellow “bradex” easy-start , spray the air filter for 10 seconds, put it back on the airbox or spray inside the airbox – Make sure the airbox is on and secured (harder to start without it properly)
Full choke, crank and let it scream to life , then see if the carbs will run on choke for 5mins, then slowly turn the choke off
If it dies, let us know – Also check if both cylinders are hot if its running on choke?
you either have fueling issues from a clogged tap, clogged pump , (yes new parts can get clogged up if the tank has debris) or the carbs need attention (likely “Starter Jet” that is permanent is clogged, pilot jets clogged up) or even the carb passages (every hole in the carb) is clogged
Or you will need to check your intake manifolds, and replace their O-RINGS if there is micro leaks under there causing a loss vacuum to open the pump / carb isn’t being utilized properly by the engine due to vacuum loss)
Check spark plugs if they are wet ? (fuel is entering engine, therefore it should spark and start)
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May 2, 2026 at 4:06 PM #22456
Hi there it runs on choke but when i put it off choke it suddenly cuts out both cylinders get hot
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May 2, 2026 at 6:26 PM #22458
Have you checked everything else mentioned in my previous comments ? – You either have compression issue or carb issue (explained above) or electric
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