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I will try to take it apart again. Nice bike don’t want to give up on it. Measured per your instructions with hard pipe not the hose on hot engine. Told me compression is good. Bike ran OK before carb was taken apart just bogging at higher rmp so must be something in the carburettor. Thank you for the input Marcel I will try and clean it all again.
Hi again. As per your advice measured the compression it’s 12bar on each cilinder. Took of carburetor took it apart and cleaned everything. Put it back together now it starts but won’t rev up. Dies as soon as any throttle applied. Checked for vacuum leaks with brake cleaner all seems good. New spark plugs. Upgraded fuel filter from your site. Hoses not bent fuel coming through. Fuel pump has pressure when pipe removed shoot petrol out. Complete lost at this stage.
- Replaced my spark plugs with new iridium ones but didn’t have the chance to test ride it. Getting fuel now but still in 4th or 5th gear at higher speed when coming off throttle and going back on the bike feels erratic. Sputters for few seconds then picks back up as normal. Replaced spark plugs with new iridium ones. Picture of old spark plug. Is it good colour?

Hi again I will test the compression. Your upgrade filter arrived and was fitted yesterday. Bike started fine. Filter filled up fit fuel etc. Whent for a quick ride no more loss of power high end rides good but after about a mile started loosing all power and cut out. Fuel filter is empty and not getting fuel. Thank you.
Hi thank you for reply. Still the same. Haven’t cut out but was not doing full speed lately just city riding. Starts quite poorly when cold takes few times and needs some throttle with choke on full. Warm start not bad. No history on the bike so no idea what has been done to it tbh. Visually has only sc project straight through exhaust. That’s all I know about it. I have ordered upgraded fuel filter with lines from your side as well as new filter and iridium spark plugs. Will update the post when all that is fitted.
Jul 16, 2023 at 5:46 PM in reply to: Hyosung Owners Picture Gallery: Show Off Your Bike Photos & Mods 📸 #10752
- Replaced my spark plugs with new iridium ones but didn’t have the chance to test ride it. Getting fuel now but still in 4th or 5th gear at higher speed when coming off throttle and going back on the bike feels erratic. Sputters for few seconds then picks back up as normal. Replaced spark plugs with new iridium ones. Picture of old spark plug. Is it good colour?
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