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Post by davewfc603 on Jun 1, 2008 5:59:57 GMT -5
There is a oil pump on the yamaha xt500, current bid .99us that ends today 6/1. The dealer is Motorcycle_parts_4_sale. good luck, Dave
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Post by colinjay on Jun 1, 2008 17:34:23 GMT -5
When I rebuild an egine that has a lot of mile on it I always replace the oil pump rotors. I have yet to see a set of servicable rotors in any of the old motors I have pulled down. the rest of the oil pump has always been ok, however it is posible for the crankcase where the inner rotor set rubs on it too become bably scored. If it was really, really bad it would effectivly trash the crankcases, but I have not seen one that bad, YET!
A second hand oil pump would almost certainly require new rotors.
CJ
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Post by StewRoss on Jun 2, 2008 3:29:26 GMT -5
Here's a diagram of the XT/TT system. Might help you to understand. Can't find a decent one for the SR sorry.  SR  |
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Post by malakiblunt on Jun 4, 2008 4:42:39 GMT -5
Thanks guys, im going to pull the pump today and have a look at it, looks like if i need new rotors ill have to order them from the usa, wich is a pain but cant be helped, i think the scavenge pump not scavengeing can be the only reason now for the engines trouble.
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Post by malakiblunt on Jun 4, 2008 9:10:18 GMT -5
Now im confused have just pulled the pumpand it looks prety good to me, some very slight nicks but nothing that could be called scoreing ,  so why is the oil not getting back into the tank ?? ive cheacked the hoses filters and pickup for blockages. im compleltly at a loss now, to whats causeing my bikes chronic wet sumping / diesiling |
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Post by malakiblunt on Jun 4, 2008 13:33:45 GMT -5
well ive striped the pump and it is in very good conditon except for one of the oil seals wich is badly torn is that enough to stop it scavengeing?
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Post by aero on Jun 5, 2008 4:21:14 GMT -5
You need to check that the pump mating surfaces are flat. There is a Yamaha service bulletin about it. PM me your e-mail and I'll send it to you. I haven't worked out how to post PDF documents on here yet! Hang on, see if this works.....  |
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Post by malakiblunt on Jun 5, 2008 6:15:28 GMT -5
Thanks Aero! im defintaly going to give that a try
, ive ordered 2 new seals as well. i geuss that is why yamaha modified the pump to 5 screws?
i was realy at a loss as to what could be causeing my woes, that bit of info has given me some hope!
thanks again .
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Post by malakiblunt on Jun 8, 2008 13:44:33 GMT -5
Well i replaced the pump seals and lapped it as per the instructions provided by Aero (thanks mate) put it all back together, and after adjusting the idle it now apears to be working ,  no wet sumping no clouds of blue smoke, lovely steady idle. havent given it a proper test yet but it is looking good  thanks for all the help guys |
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Post by davewfc603 on Jun 8, 2008 13:59:59 GMT -5
did you do a wheelie yet? I upon putting my bike back together,kept thinking & looking for parts falling off the bike. So far only one loose screw, me I think. Good luck to hear you got it working Dave
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Post by malakiblunt on Jun 8, 2008 16:53:48 GMT -5
lol no havent riden it yet as i need to rethread the sprocket nut as its striped.
but will get that done tomorow and take it for a quick spin, just to cheak i realy have fixed it!!
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Post by caferacercarl on Jun 9, 2008 0:05:51 GMT -5
Guy's every part for these bikes are available new at ANY Yamaha dealership in the WORLD, and no more than 3 weeks wait anywhere in the world, anywhere, or, change the shop you do business with, Stew Ross has bought all the rebuild parts for the oil pump off me before, but then I keep 5 engines full of EVERY part on shelf anyway, KEDO in germany even have a high volume pump on the shelf for a cheap price. the sprocket nut new is about $9 australian, or about 4 quid, 6 euro's, again, Kedo I think sell them for even cheaper!!
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Post by davedunsboro on Jun 9, 2008 6:45:51 GMT -5
Hope all goes well ,this was definately a different SR fault as I haven't heard of this one before(I possibly put the mokker on one of my bikes by actually writing that) cheers Dave.
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Post by malakiblunt on Jun 9, 2008 15:41:43 GMT -5
well i just took it for a spin down the lane, it starts ok, idles beutifully no more blue smoke and the oils getting back to the tank , but its running like a dog when you open the throttle. i assume its the carb, since i have no experince of theses engines done realy no what a healthy one sounds like.
ho hum
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Post by StewRoss on Jun 10, 2008 3:01:59 GMT -5
Mate, life wasn't meant to be that easy...you'll get there...have you replaced the plug? SR |
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no wet sumping no clouds of blue smoke, lovely steady idle.
