New Member with '84 -'85 Yamaha Riva problem.

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New Member with '84 -'85 Yamaha Riva problem. by: bomartin - May 13, 2017 13:04:58 GMT -5

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Post by bomartin on May 13, 2017 13:04:58 GMT -5

Hello from Southwestern PA. I recently bought a 1984 Yamaha Riva 180 Z from a friend. I'm in the process of working on the cold starting problem.

The first problem I found was the vacuum operated fuel pet cock is bad. As some of you my know that part is hard to find. I just bought a complete fuel tank with the fuel cock and fuel gauge sending unit. The seller said he didn't know if they worked.

Can any one tell me how much vacuum pressure is required to open the fuel cock? I have a vacuum pump to check the fuel cock but I don't want to put to much vacuum to it and damage the diaphragm.

Thanks for any help.
-Bo Martin

Last Edit: May 13, 2017 13:14:25 GMT -5 by bomartin

terrilee PM terrilee terrilee's Posts terrilee's Threads Senior Rider Currently Offline Founding Member and forum cheer leader. I'M BACK, like it or not--lol Posts: 684 Likes: 6 Joined: Feb 23, 2013 8:29:43 GMT -5	New Member with '84 -'85 Yamaha Riva problem. by: terrilee - May 14, 2017 6:54:46 GMT -5 Reply Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by terrilee on May 14, 2017 6:54:46 GMT -5 hey Bo im from sw pa also jeannette area ive been "on vaca" for 4 years so ive forgotten alot But just wanted to welcome ya here some one will help ya soon
	"CHRISSY" 2008 Shanghai Schenke Motorcycle Company LTD model # SL 150 21B changed all lines, NGK plug, added windshield, saddle bags, extra LED brake light and turn signals on trunk otherwise STOCK!!!!!!! 67 mph top speed, i was 120 lbs, PA STATE POLICE VERIFIED " Wanna run PINKS ?" as of 14 Jan '13, 8215 miles die oppresors libre HILLARY IN 2016

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New Member with '84 -'85 Yamaha Riva problem. by: bandito2 - May 14, 2017 9:51:37 GMT -5

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Post by bandito2 on May 14, 2017 9:51:37 GMT -5

You could try finding a vacuum operated petcock from another bike... maybe even a Chinese bike. And probably one from a similar sized bike; 150cc to 200cc possibly. Might have to adapt for different size hose fittings but that should be relatively easy I would think.

Just thinkin out loud.

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New Member with '84 -'85 Yamaha Riva problem. by: bomartin - May 15, 2017 9:10:01 GMT -5

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Post by bomartin on May 15, 2017 9:10:01 GMT -5

Thank you terrilee I live in Washington , 30 miles south of Pittsburgh. Thank you too Bandito, I found another vacuum petcock I can use if the one on the tank I bought doesn't work. I'll have to take the one on the tank apart and take the stopper out of it so the fuel will flow to the other pet cock. Thank you for the reply.

Last Edit: May 15, 2017 9:18:17 GMT -5 by bomartin

New Member with '84 -'85 Yamaha Riva problem. By bomartin (Read 816 times)

Post by bomartin on May 13, 2017 13:04:58 GMT -5

Post by terrilee on May 14, 2017 6:54:46 GMT -5

Post by bandito2 on May 14, 2017 9:51:37 GMT -5

Post by bomartin on May 15, 2017 9:10:01 GMT -5

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