GT250 Naked cranks but doesn’t start.
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I purchased a 2005 Hyosung GT250 naked for 300 bucks. 4k miles on it, cranks but doesn’t start. Needs a new magneto assembly, would that cause the bike to not start? Anything else I should check out while we’re at it?
Also is there anywhere I can get aftermarket things? Fuel tank, muffler etc? I know I can shop on Hyosung but wanted to see where else I can. Thanks!
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it sounds silly but when cranking the bike does the RPM gauge move ?
because on a carby bike, when you press start , the RPM gauge always dances between 600-1000 rpm (magneto rotor spinning) and coils working ? + CDI unit.
But sometimes no spark is a sign of
- Bad coils
- Bad HT cap (common) thats why we use NGK ones.
- Side Stand switch (bypass it, as it is that annoying) but don’t forget to check side stand before riding!
- Clutch Handlebar Lever Switch (Don’t bypass it) as fake neutrals can happen , an engine can spin straight to 1st gear and bike falls down , as neutral wasnt “fully” neutral if you know what i mean, it’s always good to squeeze clutch before starting anyway.
I can always post a diagram if you like ?
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So the rpm gauge isn’t moving, the starter clutch (?) I believe that is what it is, it’s behind the magneto assembly, that is missing teeth so I don’t know if that would play a part. The magneto assembly actually looks fine, but that part we believe is the starter clutch is broken. I’ll insert a picture.
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Poor girl 🙁
Starter System
Magneto SystemHow handy are you with testing your meter on the coils themselves ?
- Check for primary and secondary resistance and report back
- Check the “HT Cap” on its own (remove HT cap from the coil) and check if its over or under 9,000 ohms (end to end)
Since the oil is drained. remove the bottom “TRIANGLE” that’s under the engine where drain bolt goes in.
Under the triangle should be a “Seeve” there, take it out (watch your eyes)
And see if old teeth fall out. unless you already made sure there is no floating metal bits in the engine and replace oil filter too!
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we will be going to get a new volt meter tomorrow, ours conveniently bit the dust. But the starter clutch has almost half of the teeth missing. Not sure how anyone managed. We pulled the triangle and opened the seeve, more oil came out but no metal chunks or anything came from there. Definitely needs a new oil filter, the kid we got it from flooded it horribly. Gasoline mixed with the oil so much it smells like we dumped gasoline all over everything. The chain on the bike needs adjusted, it’s missing a caliper on the front. The battery is zip tied on, gas tank and carbs aren’t even hooked up which makes me worry about the carbs, now I’m thinking for that we may need to take it to a shop, what do you think?. It’s a project bike that’s for sure but I’m ready for it.
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we will be going to get a new volt meter tomorrow, ours conveniently bit the dust. But the starter clutch has almost half of the teeth missing. Not sure how anyone managed. We pulled the triangle and opened the seeve, more oil came out but no metal chunks or anything came from there. Definitely needs a new oil filter, the kid we got it from flooded it horribly. Gasoline mixed with the oil so much it smells like we dumped gasoline all over everything. The chain on the bike needs adjusted, it’s missing a caliper on the front. The battery is zip tied on, gas tank and carbs aren’t even hooked up which makes me worry about the carbs, now I’m thinking for that we may need to take it to a shop, what do you think?. It’s a project bike that’s for sure but I’m ready for it.
If you can get yourself some carb cleaner , would you be able to clean the carbs out hard and also use air compressor to blow out every small hole inside the carb , then for your parts list will just be “carb rebuild kit”
If no metal shavings fell out, i best hope they are inside the oil filter , i mean looks like he hydrolocked the engine with flooded carbs and fuel and the 650 tried to crank , causing its teeth to shear off from the sprocket behind the crank, this is my theory unless the kid admits it!
Poor thing damn, if you’re ready for it, the forum is open for questions and topics , you will be making us happy for rescuing it 👍
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We’ve got an air compressor so we will be sure to also do that. So far the kid won’t admit to anything, he quit answering the second we were gone so I’m sure he knows more than he is letting on which sucks, if he would just say what’s up we wouldn’t be mad it’s a 300 dollar bike we just need to know what he did when he had it but eventually we will figure it all out anyways. From what we’ve found out the bike was owned by our state and used to train people before this kid got it.
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