Engine Problems | It Is The Ride

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Engine Problems by: nmyers19 - Apr 4, 2013 9:48:54 GMT -5

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Post by nmyers19 on Apr 4, 2013 9:48:54 GMT -5

Hey all, I am new to this board and a new scooter owner. I just purchased a 2000 Yamaha Riva xc125.

It was running great. Sometimes it took a couple of starts for the engine to stay running when it was cold, but today, it wouldn't stay started. It would turn over and start for a few seconds but then would cut off. Tried about a dozen times before I gave up / didn't want to ruin the starter.

I just recently changed the oil so I'm thinking that it might have something to do with it. I'm hoping not though. I read in the manual that if it was going to be over 60 degrees (I live in Austin, TX) I should put 20w40 oil in there but Auto Zone didn't have that so I went with Synthetic 20w50 motorcycle oil. Would this have anything to do with it since it's a very thick oil? If you don't think so, what do you think it could be?

Thanks,
Nick

richardthescooter1 PM richardthescooter1 richardthescooter1's Posts richardthescooter1's Threads Junior Rider Currently Offline Posts: 374 Likes: 5 Joined: Mar 4, 2013 14:41:38 GMT -5	Engine Problems by: richardthescooter1 - Apr 4, 2013 10:05:14 GMT -5 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by richardthescooter1 on Apr 4, 2013 10:05:14 GMT -5 I'd check your ignition coil, make sure the spark plug is on and tight, make sure the wire on both eands are tight, If that's good and no start, Check to make sure your getting spark.
	Last Edit: Apr 4, 2013 10:12:34 GMT -5 by richardthescooter1 MC-54-250B Get into the Scooter Zone.

JR PM JR JR's Posts JR's Threads ADMIN Currently Offline Posts: 7,903 Likes: 142 Joined: Feb 14, 2013 17:49:49 GMT -5	Engine Problems by: JR - Apr 4, 2013 10:08:36 GMT -5 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by JR on Apr 4, 2013 10:08:36 GMT -5 Welcome, I tend to agree with Richard.

skuttadawg PM skuttadawg skuttadawg's Posts skuttadawg's Threads Global Moderator Currently Offline Posts: 1,514 Likes: 14 Joined: Feb 24, 2013 14:42:41 GMT -5	Engine Problems by: skuttadawg - Apr 4, 2013 10:08:50 GMT -5 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by skuttadawg on Apr 4, 2013 10:08:50 GMT -5 www.chinesescooterreference.com/pdf/50_150cc_gy6_shop_manual.pdf

nmyers19 PM nmyers19 nmyers19's Posts nmyers19's Threads New Rider Currently Offline Posts: 3 Likes: 0 Joined: Apr 4, 2013 9:39:28 GMT -5	Engine Problems by: nmyers19 - Apr 4, 2013 10:19:33 GMT -5 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by nmyers19 on Apr 4, 2013 10:19:33 GMT -5 Great thanks everyone. I will check those out and see if it solves the problem.

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Engine Problems by: rockynv - Apr 4, 2013 12:20:18 GMT -5

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Post by rockynv on Apr 4, 2013 12:20:18 GMT -5

Riva's were known for an odd carb setup that was finicky when it got a little cool out. Search on Riva choke or carb problems and you should start turning up the info you need.

A Chinese scooter manual may not provide much help on the Yamaha.

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Engine Problems by: alleyoop - Apr 4, 2013 12:34:57 GMT -5

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Post by alleyoop on Apr 4, 2013 12:34:57 GMT -5

When you check for Spark make sure you ground the plug on the motor itself and NOT on the frame. The battery is grounded to the frame and the motor has to be also grounded to the frame for the spark plug to fire. Bad motor to ground connections will cause the Spark Plug not to fire while in the motor.

What kind of carb do you have a CVK carb or a Slider(throttle cable going into the top center of the carb)?

Hard starting can also be caused by the valves being tight and loosing compression.

When temps drop motors need a little more fuel due to the air density. So it could just be a minor adjustment needed to the carbs fuel to air mixture.
Alleyoop

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Engine Problems by: richardthescooter1 - Apr 4, 2013 13:18:14 GMT -5

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Post by richardthescooter1 on Apr 4, 2013 13:18:14 GMT -5

Hi Alleyoop, I was thinking tight valves too, but I thought for him to check the basic stuff first, I know about two years ago I had trouble starting mine, here the spark plug wire in my spark plug came loose.

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Engine Problems by: nmyers19 - Apr 9, 2013 14:07:35 GMT -5

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Post by nmyers19 on Apr 9, 2013 14:07:35 GMT -5

Update: I tried the easiest thing first. I filled it up with gas and it seems to be starting much better now. It had about a quarter tank in there but I guess it was something about the fuel to air mixture. Thanks for all your help!