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Discussion Starter #1
Well just looking for tips and information on this antique! Just bought it and it runs really well considering the age and is clean etc. I can't find many videos etc. on this as it's age maybe.
Since new to having a PWC can any one give tips on this one. The oil pump is not connected and am running it with 50:1 mix.
 

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Welcome aboard Tom5555
50/1 is a good mix ratio for it.
Parts are still available from Yamaha at either Babbittsonline or Partszilla. You can also find parts used on eBay. by taking the Yamaha part number and searching it on ebay as "Yamaha then #" or by application 1991 Yamaha etc.
Clymer makes a pretty good manual that will help you with maintenance. Babbittsonline schematics can also help with exploded views of the different part zones, eng, exhaust, carb, jet pump, etc.

Are you sure of the year? Model?Somewhere on the rear either on the deck or below the bump rail is a HIN tag. About a half inch wide x 2.5 long. BLK in color and rivited on. The last 2 digits are the year. Also in the motor compartment should be a sticker with the model number such as WRB650B. See pic below.
 

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I just picked up a 1993 VXR and am working on getting it running :p I have the service manual for the 1992-1995 VXR if you need anything, I can't imagine a 1991 being super different. And on the fuel mix Dave is right, 50:1 is what Yamaha recommends for most of their jetskis.
 

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Well, thank you for the tips. I was able to get the repair manual for it on Ebay. What I was kind of wanting to know is the User or Operator manual information. It's not run in Salt water. When finished usually just bring it back up on the bank of the lake. I saw somewhere you should run them for 15 seconds to flush out the exhaust port or something like that. Since, it's not on the trailer I have been hesitant to run it. It is sitting with a large tarp underneath and a very thick plastic gauge at least 4' X 4'. So it's not like it's in the dirt or sand.
Yeah just any kind of tips to keep up on it when finished running it.
Thank you again for the reply,
Tom
 

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Best to get some form of lift or old trailer to put it on. Up off the ground. Old trailer is what I use for mine. Makes winter easier as I can roll them up out of water and service them easily on beach. Before winterizing them.

As for service/upkeep. Make sure the center brg support gets a couple good pumps of quality marine grease at the start of each season. As you stated when putting up for winter start it up and blip the throttle several times to blow excess water out of exhaust. Don't let run more than about 15/20 seconds. Star Brite fuel stabilizer in winter for fuel storage. Use fogging oil while blowing out water from exhaust. And a quick shot in plug holes after. New plugs in spring.
 

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Thanks for the help. Yes, going to trailer it soon. Never heard of fogging oil. will check it out also. For stabilizer? I have been running the non-ethanol gas. it's more expensive yes and then mixing my oil so, it shouldn't gum up from using the non-ethanol. well too I haven't had it that long and expect previous owners ran the ethanol with oil mix.
 

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Discussion Starter #8
Trying to narrow this down. I took some pics of the engine stamp and the stamp for the plugs on this.
I am wondering what exact engine it is as it doesn't have the WR650 stamp or anything the pic shows
Just Yamaha J650D Plugs are NGK B8HS.. I pulled the plugs yesterday and it has NGK R underneath and then the back is B8HS.
Does it matter if you get the Plugs without the NGK R . Which I know is resistor. Just want to make sure I use the right ones and get the correct gap for them with the engine stamp information. Try to include here.
In the pic. Not sure what the other numbers mean... Yamaha J650D then far to the right it has 70???
Under that is two more sets of Numbers???
It's running pretty good for now. Just trying to get it in before cold weather to really put some stress to it and see what will have to do this winter?

Anyway if anyone has any help or idea's let me know. Much appreciated.
tom
 

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