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Oil pump throttle shaft pops out
Posted: Sun Aug 25, 2013 7:57 pm
by smokingbanana90
The throttle shaft on my oil pump keeps popping out halfway. Is there a pin that keeps it in? Is it supposed to be pressed in? Thanks!
Re: Oil pump throttle shaft pops out
Posted: Sun Aug 25, 2013 9:59 pm
by oldjapanesebikes
For a GT250 ? It shouldn't be able to come out - has someone had the pump apart ?
Re: Oil pump throttle shaft pops out
Posted: Mon Aug 26, 2013 1:39 am
by jabcb
A disassembled pump is shown in this topic:
viewtopic.php?f=2&t=8027&hilit=oil+pump
Look closely at the plate that is attached via 3 screws.
It has a little tab that prevents the throttle shaft problem you have.
If the pump is not properly assembled or there is something wrong with the tab (bent, too short, …) then you can have this issue.
The GT250 & T500 have similar oil pumps.
They use the same o-rings & seals. Bloop2 sells a seal kit:
viewtopic.php?f=23&t=8422
Also, as shown in the pic, the pump priming bolt has left hand thread.
Re: Oil pump throttle shaft pops out
Posted: Mon Aug 26, 2013 12:07 pm
by smokingbanana90
It turns out that the tab is broken off. Is there a place to get just the cap or do I have to replace the pump?
Re: Oil pump throttle shaft pops out
Posted: Mon Aug 26, 2013 6:41 pm
by jabcb
Suzuki didn't sell repair parts. Back then the pump was fairly cheap & they expected people to get a new pump on the rare occasions the pump had problems.
A cap from a T250, T350 or T500 pump probably will work.
The oil flow rate for these other bikes is different, so you may be able use the cap but not the entire pump.
At east one member has mentioned turning the left-hand bolt the wrong way & needed to replace the pump.
So its likely that a forum member has a spare.
A used pump on eBay is another option.