Question about Hyosung Motorcycles
Check vac. Reading. Am thinking you will show very low vac. Check yr crank to cam timeing i bet yr out of time
Posted on Nov 17, 2013
Testimonial: "Timing is all good. With the new air filter on can not go over 1/4 throttle. Cleaned the carbs again. Blew them out with an air hose checked the floats everything is set back to factory settings. Move the thottle passed 1/4 and bike dies. Adjusted carbs to be richier and had same problem. Adjusted carbs to be leaner and same problem. Put carbs back at factory setting and started messing with air box. With air filter off and covering 3/4 of the air intake with piece of metal with a shirt acting as a filter bike runs great. Modified the air filter box with the piece of metal and the shirt taking the filter out of the equation. So my conclusion is that the air filter is allowing either too much or too little air in. Dont know how to adjust that so it is modified right now with a piece of metal and a shirt acting like the filter. Bike rides great with the modified filter just dont want to continue using it for too long. Dont want to cause harm to the bike. Any help or ideas is greatly appreciated."
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Posted on Jan 02, 2017
Carbs gummed up. Need a serious cleaning or a full ruubers replacement/rebuild kit. Gas turns to gummy when left stting in the fuel bowls.
Use a couple of cans of Sea Foam.. best stuff in the world.
Posted on Mar 20, 2009
SOURCE: timing chain 110 hymoto pit bike
Put the piston at TDC (Top Dead Center) by lining up the timing marks on the flywheel and stator. Put the cylinder head back together with the cam installed so the high points of the cam lobes are pointing kind of downward. Pull the cam chain taught on the front side of the engine. Put the chain on the cam gear such that, when bolted to the cam, the index mark or marks are in the proper position.
The proper position depends on what markings are on the cam. Some bikes have a single mark; an arrow, a straight line or an "O". The mark should line up with the center-line of the crankshaft. If the cam has two marks opposite each other, the lines should be parallel with the gasket surface. You will need to rotate the unbolted cam left or right just a bit in order to match up the bolt holes to the gear holes.
Can I get a “very helpful” rating on this answer?
Posted on Aug 20, 2009
Lean mixtures burn very slowly, at times slowly enough to continue
burning through the power and exhaust stroke, causing a backfire when
the intake valve opens, and that flame gets a shot at the new mixture
In normal operation, as the engine slows, the fuel delivery from the main circuit falls off, and the idle circuit is supposed to take over. If the idle circuit flows insufficiently, that becomes a transition to fuel starvation.
You can try pointing an unlit propane torch into the inlet air, and see if you can get closer to an idle while supplying a supplementary fuel source. You will need to do this in a way that gets propane to both carburetor inlets, maybe rigging a Y with vacuum hoses and electrical tape...
This started with work on the carburetors, so the fuel system would be the most suspect. That, and the fact that it will run at higher RPM would seem to rule out fuel delivery.
I was looking around at photos while developing this answer (needed to know whether this was a twin or a 4-cylinder), and one resource said the idle speed should be 1,200. I don't know if that's right, but maybe 1,000 RPM is too slow for this motor to keep it together. (I do doubt that, though.)
When I wrote that last sentence, I started to second guess myself, thinking "What if the fuel shutoff(s) is/are vacuum operated, and as the bike approaches idle there is insufficient vacuum to hold it/them open?" But the I rejected that, because there is even less vacuum at cranking speeds, yet the bike starts.
Posted on Jun 26, 2010
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