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 |  Jun 11th, 08, 12:46 PM | | Junior Member Join Date: Jun 2008
Posts: 6
|  1990 bigbear oil trouble
does any on know if i need to bleed the oil pump if so how. i instaled a new pump. blew out all the ports in the block.but aint geting oil to the top end | | |  | Jun 13th, 08, 08:21 AM | | Junior Member Join Date: Jun 2008
Posts: 6
|  still waiting fora answer to oil trouble
I posted a problem,but still no answer. i have a bigbear 350 1990 i aint getting oil to the top end. replaced the pump. blew out all ports.it pumps oil out the top of the clutch cover from the oil lin to the filter side in sperts, at times.i tore this thing apart 5 times now.any help would be nice... | | | | Jun 14th, 08, 12:38 AM | | Senior Member Join Date: Sep 2007
Posts: 116
| i've never heard of bleeding a oil pump on a atv (not familiar with yamaha), sorry can't help more than that but i'm a honda mechanic and have no clue were all the oil lines hook to on the bear to point you in a good direction. | | | | Jun 17th, 08, 10:51 PM | | fixen um up 1 at a time Join Date: Jan 2007 Location: loma rica california
Posts: 134
| i sounds like you eather dont have enough oil in it or you put the pump in wrong/ it was bad | | | | Jun 20th, 08, 02:33 AM | | Member Join Date: Jan 2007 Location: Minnesota
Posts: 91
| Some basic questions, don't be offended. Covering the basics usually leads to a solution.
New oil filter?
oil pumps are by design self priming, can you measure the pressure at some point inline?
Oil passages need to be cleaned anyway possible, flushing out with parts washer is sometimes not enough, pipe cleaners (smoking kind) may be of help.
Are all the lines correctly installed making the routing the same as original. I've seen serious racers hook up lines backwards and spend much time trying to figure out why the oil pressure never builds up.
Best of luck,
Doogie | | | | Jun 20th, 08, 08:33 AM | | Super Moderator STAFF Join Date: Jul 2007 Location: Crossville,TN
Posts: 1,821
| | | | | Jun 20th, 08, 09:03 AM | | Junior Member Join Date: Jun 2008
Posts: 6
| thanks doogie. well im still working on it. all lines are clear, oil fillters new. new seal in clutch cover for crank.im thinking is thier a pickup on the crank,like what the hell feeds the pump.thiers a in and a out marked on the pump.well if i solve my delema, ill tell all what i found. unless i burn it first.. | | | | Jun 20th, 08, 09:17 AM | | Member Join Date: May 2008
Posts: 48
| | | | | Jun 20th, 08, 09:21 AM | | Member Join Date: May 2008
Posts: 48
| | | | | Jun 21st, 08, 12:50 AM | | Member Join Date: Jan 2007 Location: Minnesota
Posts: 91
| One other possibility, the pickup probably bolts up to the pump, if so it might have an O-ring to seal against the pump, have you checked to see that this seal (gasket or O-ring) is in tact. A ripped seal would certainly deliver the trouble your having. Sucking air is bad.
Hope that helps or at least gives perspective.
Doogie | | | | Jun 23rd, 08, 08:53 AM | | Junior Member Join Date: Jun 2008
Posts: 6
|  oil trouble solved
Well doogie, i got it. hear it is, if any one asks the same ?. Iwas always pulling of the clutch cover right. the oil would drain out. it downed on me the pump must have a pick up line some wear. all sights did not have a exploded view of the oil passages. so i got budy at yamaha to get me a pick. it shows a pickup at the oil plug drain.. I lifted the bike on end puled the drain plug, and low and behold. thier it was apick up line, all pluged up with little bits of rubber tires . they mount on the main clutch. in whitch i changed out with a new clutch. all good now lots of oil going to the head now. as well as mine... thanks | | | | Jun 25th, 08, 10:34 PM | | Member Join Date: Jan 2007 Location: Minnesota
Posts: 91
| glad to read it! now ride that bich!
Doogie | | | |
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