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Starts runs wont accelerate

My hyosung GT205R 2006 model wont accelerate it starts up fine and revs fine. just when i accelerate its gets up to about 40-60k/hr then looses power in acceleration and wont go any faster only gets slower. any ideas on whats wrong with it?

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  • Hyosung Master
  • 767 Answers

It seems there is fuel starvation when you reach that speed or the spark plug seems to fail.
(1) Check the spark plug and also see if it's of a correct specs per the manufacturer's recommendation.
(2) There could be a blockage in the carb's main jet which restricts the flow of fuel at that speed.
Hope this helps!

Posted on May 04, 2013

6 Suggested Answers

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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: MY YZ250 WONT REV PAST 3/8 THROTTLE. I NEED HELP!!

It does sound like an ignition timing problem, but could also be a breathing issue, air flow in or exhaust flow out could be restricted i.e.:dirty air filter, excessive carbon build up in exhaust pipe from burning too much oil or rich fuel mixture.
possibly and more likely some junk got into your fuel system and partially plugged up the main jet in the carb, -or has the needle on the slide been moved? The little circlip at the top of the needle, if it has one.
1.Replace the spark plug, check gap, check spark, it should be bright blue and fat.
2. check the fuel filter, if no filter check the carb for dirt.



Posted on Jan 20, 2009

  • 3567 Answers

SOURCE: bottom end rattle on 1st gaer take off

Sounds like pre-ignition, AKA engine knock and detonation.
Install new NGK spark plugs one heat range colder than stock. >>Only use premium gas.<< Run through a tank of premium gas. Change gearbox oil and filter. (clean oil cools better than dirty oil).
The problem will likely disappear.

Please rate this answer. Thanks!

Posted on Apr 08, 2009

  • 18 Answers

SOURCE: accelerator stuck open

This has happened to me before, and i know just what the problem is. Under the fuel tank, the throttle cable goes into a plastic cable housing, and sometimes the cable guard gets stuck out of the housing, causing the throttle to be constantly open. Just take off the tank, follow your throttle cable to find where it's stuck and release it.

Posted on Jun 15, 2009

  • 218 Answers

SOURCE: 2006 r1200rt engine cuts out during hard. bike works fine during

Hi..my name is Keith..and most new motorcycles has a thing called a "Rev Limiter"...and it if you push or rev it hard..it will make all kinds of popping and crackin noise and you will lose horse power..i dont know how hard you are trying to push your motorcycle..i hope this helps you

Posted on Jun 29, 2009

czaa
  • 4514 Answers

SOURCE: 2007 Hyosung GT250R stalling in 1st

clutch needs ajust cable wise or internal-they r similar to ***-chec library sec 629 if no manual is sold

Posted on Aug 17, 2009

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Maybe this will help. This is a common problem that I have had with my GV250. Almost the same bike mechanically by Hyosung.

If the battery is low on charge and you are lucky enough for the bike to start. As per normal when first started it revs higher because the bike is cold, this turns the alternator fast to give you the electricity you need to keep the bikes computer working properly. Bike will warm up and revs drop down, alternater not turning as fast, not as much electricity being made. Bike will either stall or rev up and down irradically to try to produce its own electricity. This will occur when the battery charge is low and bike is at low revs, for example when you slow down for traffic or you stop.

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Make sure your battery is maintained. If you dont use your bike for a while it will lose charge just sitting there doing nothing. Give the battery a good deep cycle charge or take the bike for a good long open road ride.

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My hyosung wont start, it was running fine until it was parked in the shed for approx 3 months, now it wont start! It seems like a fuel problem, it will start and rev when we squirt fuel into the...


Hello and thanks for the question.
It sounds like the carbs are not getting fuel to the engine. This is common with the fuel that we get now. the fuel is not stable and can gum up quickly. I have seen carbs become clogged in as little as 60 days.

The first thing to do is drain the old fuel out of the tank and the carbs. There is a drain screw at the bottom of the carbs and you can drain the fuel out by loosening the screw. Make sure that you are carefull when draining the fuel out so that you dont have excess fuel leaking everywhere. I usually put a small container uinder the drains.

Syphon the fuel from the tank and replace with fresh fuel.

After all this is done try and start the bike and run on choke for a while. the fresh fuel can help to flush the old gas out. If the bike does not run properly the tank and carbs may need to be cleaned. The carbs are very detailed and should only be worked on by a qualified technician.
Thanks and I hope tht his helps.
Steve

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2007 Hyosung GT250R stalling in 1st


clutch needs ajust cable wise or internal-they r similar to ***-chec library sec 629 if no manual is sold

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The jets on the carb need to be cleaned.

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