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Post by gatekeeper on May 21, 2013 3:56:18 GMT -5
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Post by gatekeeper on May 20, 2013 9:20:52 GMT -5
Running water
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Post by gatekeeper on May 20, 2013 7:25:59 GMT -5
Don't forget the intake manifold itself. Make sure it is on tight.
Yes exhaust leaks can cause problems too. The engine needs a certain amount of back pressure to be properly balanced. And a leaky exhaust can make the engine run hotter leading to a burnt exhaust valve.
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Post by gatekeeper on May 20, 2013 6:53:11 GMT -5
Ok thank you for that pamplet on how to tune the carb I've been tinkering all day but when I turn the air/fuel screw. Nothing happens left or right. And the rpms are jumpy.go from 2-1700-1000-1500-1000-1700-2000-1700.... And when I give it throttle it still wants to bog out When the idle jumps around like that it usually means you have an air leak somewhere and it is running too lean. Check the air filter housing for cracks. Check all air tube and carb mounting points for tightness. |
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Post by gatekeeper on May 19, 2013 21:37:37 GMT -5
Should be no problem. I think the weight capacity on most 150's is around 350lbs.
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Post by gatekeeper on May 19, 2013 21:32:35 GMT -5
lmao  Kind of reminds me of Willie Nelson. |
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Post by gatekeeper on May 19, 2013 8:40:23 GMT -5
millsc has become a knowledgeable scooter mechanic!
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Post by gatekeeper on May 19, 2013 6:48:53 GMT -5
If the plug is black, the engine is either burning oil or is running very rich. Make sure you have the right plug. I'm not familiar with this engine but I think the right plug is NGK DR8EA. Start by adjusting your carb's air/fuel mixture screw. It is located on the bottom of your carb on the intake manifold side. Count the number of turns it takes to close it before you start so you know where it was at when it ran. get the motor warm before you start the adjustments. A good starting position is 2 1/2 turns out. Here is a good tutorial for adjusting carbs: www.itistheride.com/Help_carb_adj_4T.pdfNot having any luck finding an exhaust gasket yet. I will keep looking. Tin foil would probably not stand up to the heat. Take your idle set screw off and go to the hardware store. See if you can match up a replacement there. |
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Post by gatekeeper on May 19, 2013 6:00:27 GMT -5
I'm not familiar with the Riva. However, if it has a 4 stroke engine I would be checking the valve adjustment.
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Post by gatekeeper on May 18, 2013 21:49:08 GMT -5
Check for spark on the engine case, not the frame. If the engine does not have a good steady ground the plug will fire when touching the frame but may not while installed in the engine. Here is how to do the valves on the horizontal clone engine. www.itistheride.com/Help_257cc_valve_adjustment_tutorial.pdf |
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Post by gatekeeper on May 18, 2013 21:40:52 GMT -5
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Post by gatekeeper on May 18, 2013 13:29:29 GMT -5
Make sure the battery is fully charged or jump it from a car battery. Just make sure the car is not running. If it's not the battery well, follow the steps.
Just because it ran yesterday doesn't mean it is getting spark, or fuel, or compression today.
Is the kill switch in the run position? Does it have a sidestand safety switch?
My scooters all started fine yesterday. If I were to go and try to start them today and they didn't, I would follow the same steps.
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Post by gatekeeper on May 18, 2013 11:58:35 GMT -5
When is the last time it was running?
Pull the spark plug, put it back in the boot and hold the plug to a metal part of the enginge and crank the engine over to check for spark. If you have spark then check for fuel flow.
Pull the fuel line loose and hang the end in a container. With the spark plug installed back in the engine crank the engine and see if fuel flows into the container. If so replace the fuel line on the carb.
Remove the vacuum hose from the intake manifold and spray some carb cleaner, or dribble some fuel into the vacuum port on the intake manifold. replace the vacuum hose and crank the engine. If you have compression it should at least pop some and maybe even start. If not then check your valve adjustment.
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Post by gatekeeper on May 18, 2013 6:11:19 GMT -5
Pretty sure the CH250 has an AC fired CDI.
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Post by gatekeeper on May 18, 2013 6:06:36 GMT -5
I agree with Alley. Time to adjust the valves.
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plus shipping. Look about a third of the way down this page: