Question about Daelim Roadwin Motorcycles

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Hi, I'm from Malaysia. I own a Roadwin and I have a problem. My bike dies on idle when it's warmed up. It starts up instantly and fine in the mornings with just one push of the starter. But when it is hot or has been on a 15 min ride or more, it will die when i stop for traffic lights or when i shift gears on low rpms. The rpms on idle are unstable from 1.3k-1.8k and then the bike just dies out instantly reaching 0 rpms just like that. All this happened after I sent my bike to a mechanic to mod my vavles and piston to make acceleration faster. He replaced the stock carb to a new one. I also noticed some leakage near my spark plug area. I appreciate any answer you can give me..thanks a lot!

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  • Daelim Master
  • 42,952 Answers

Hi, Jinn_unlimit the first thing I would do is take it back to your mechanic since he was the last one to work on it and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a "LOAD" test if necessary, your battery may show 12.5 volts but have little or zero amps and needs to be replaced.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, stator, magneto, points/condenser ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture screw improperly adjusted.
10. Accelerator pump damaged or not working.
11. Water or dirt in the fuel system, carburetor or filter.
12. Restricted, blocked or kinked fuel line.
13. Fuel tank empty.
14. Fuel tank contaminated with ethanol sludge.
15. The gas cap is not venting properly or fuel tank venting system blocked.
16. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
17. Needle and seat stuck closed in the float bowl.
For more information about your issue and valuable "FREE" downloads that you need please click on the blue links below. Good luck and have a wonderful day.
Thread Daelim roadwin 125
need help Valve clearance carb idle speed 1681
DAELIM ROADWIN VJ125 Service Manual
Complete Daelim Parts and Accessories
DAELIM ROADWIN 125 FI Manual

Posted on Mar 30, 2017

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: engine dies when i give it gas, only when cold

ALWAYS have a fire extinguisher at hand when working on carburetors.
Drain the carburetors. There should be a screw on the lower side of each carb float bowl. Remove the screw then replace it after the fuel drains. Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, (not all bikes have a water trap bowl). Turn the gas back on and wait a minute for the carbs to fill with gas. If the bike doesn't start and run properly then shut off the gas and remove the carburetors from the engine.

FOR EACH carb > Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Before putting the slides back in the throat of the carbs, move the clip on the jet needle one notch lower. Put the rest of the carb back together and install the carb. Sync the carbs such that the slides on the carbs move at the same exact instant when the throttle is slowly turned from idle speed. Clean or replace the air filter and install an in-line fuel filter. Let the float bowl fill then start the engine. This process should get you back on the road.


Please rate this solution. Thanks!

Posted on May 05, 2009

  • 2 Answers

SOURCE: FXR suzuki 150 will idle but wont rev

Clean the fuel tank, fuel hose and fuel valve.

Posted on May 25, 2009

SOURCE: Honda shadow ACE 750 dies on idle after warmed up

I guess you will have to reset the air-mixture screws of the carburator/s.
Not bad if you check the condition of the spark plugs...if its ..'Whitish' means lean i.e. less gas in, Brownish...means ok, 'Blackish'...means too much gas in .....'rich'
In your bike's case you may find it 'whitish'.
Hope this helps !

Posted on Jul 19, 2009

wayneman01
  • 301 Answers

SOURCE: my vstar 1100 dies when in idle. acceleration is

Is the idle speed set too low? If so, adjust it, using the idle speed adjusting screw, to the correct idle speed (900 RPM). If that's not the problem, then check for air leaks between the carburetors and the engine by spraying WD-40 around the intake manifolds with the engine running. If there is an intake leak, the engine RPM will change briefly when the WD-40 is sprayed near it.
Aside from that, there are two other things that can cause your engine to die when it should be idling: the idle speed mixture adjustment, or low cylinder compression. Of course, if it was idling fine before, and the idle mixture adjustment hasn't been changed, then do a compression check, first. To idle properly, each cylinder's compression needs to be at least 140 psi.

Posted on Nov 19, 2009

  • 47 Answers

SOURCE: 1988 Suzuki GSX-R750 Slingshot problems(fuel/air)

Sounds like ignition problems; I know you've had it serviced but check condition of spark plugs. Check all electrical contacts for corrosion, more specifically the timing pickup circuit, wires to coils, CDI connector. You're CDI may be the culprit, try swapping it out for a known good one. If it's back firing then enough fuel is getting through the carbs, so would indicate to me that the problem doesn't lie there. Hope you have some luck.

Posted on Mar 12, 2010

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