Question about Motorcycles
Youve jammed the ratchet.you need to remove the engine casing and reset the mechanism, check the return spring.also you need to set the float level on carb to correct height.to check engine turns over remove spark plug,put in gear and turn back wheel.
Posted on Nov 19, 2014
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Posted on Jan 02, 2017
SOURCE: 1974 honda cb550 will not run?
• The first thing to do with ANY engine that has sat for any longer
than a couple of months is to dump ALL the fuel in the tank and
carb(s). ALL OF IT !! You'll want to refill with some high priced fuel
that has fuel system cleaners (Like Chevron with Techron) not becasue
you need high-test fuel, but because you need the cleaners. It's ether
that or disassemble the carbs and clean out jets you can't find much
less see. Your choice. The carb kits alone will cost you about $50 so a
tank of high-test is looking pretty good, huh?
• Now the fact that you tried to crank the engine with old fuel has fouled the sparkplugs. All of them. Go buy all new sparkplugs.
Posted on Mar 21, 2009
SOURCE: 1989 tw200 yamaha won't start
G'day egdbcs . Ok.now lets see.You say good spark,so i'm presuming you are doing the old sight test.Try bending the arm on a know good sparkplug about 5-6mm,earth the plug and kick'er in the guts(crank it over)Be very carefull , high voltage danger.If there's still a good spark it's safe to say that there will also be a good spark under pressure in the combustion chamber,speaking of which you should also do a compression test,anything over 100psi should be ok. as i'm not to sure of the extent of the re-build,hopefully the valves were lapped and checked for straight and true and valve seals replaced,if you notice oil on the tip of the spark plug you could have a leaking valve seal or oil seal .Try putting a small amount of fuel directly into the combustion chamber ,tighten up the spark plug ,install the plug cap and.......Yeah ..You guessed it ..."kicker in the guts".If all the abouve are correct and true it should fire up.If it runs for 5-10 seconds then stops you've got some sort of fuel starvation problem , could be dirt in the carb,blocked idle jet ,or air passage or even the needle could have come off it's clip,believe me with an old bike like yours anything could be worn and loose inside that carby.The only other thing to consider is the timing.There may be a good spark but is it happening at the right time inside the engine???. I'll leave it all in your capable hands EGDBCS.Hope this helps to solving your worries. Chow for now......Tilleydog..
Posted on Jun 03, 2009
What is the compression on the cylinder compared to the other cylinders? It should be within 10%. Some causes can be - as you suggested - the valve stem seals. Also, the sleeve could be rusted, as the valves could have been open on that cylinder. Generally speaking, on a 4-cylinder motor 1 cylinder has both its valves closed, 1 has both open, 1 has an inlet valve open and one has an exhaust valve open at any given time. Another possibility is that the valve could be sticky - try Wynn's Valve Ease or a similar product.
Posted on Jun 18, 2009
it could be the gaskets around your carb are bad and leaking air if so its thinning your gas fumes with more air then what is needed inside your combustion chamber witch is causing your engine to stop running like that. best of luck
Posted on Apr 20, 2010
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