GT750A Oil Pump Arm Sticking

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GTNelly
Posts: 30
Joined: Sun Oct 14, 2018 9:37 pm

GT750A Oil Pump Arm Sticking

Post by GTNelly »

I'm just in the process of completing a refresh of my GT750A (owned since 1997) and I've found an issue with the oil pump

I've found that the lever arm sticks on its return stroke about 2/3rds way back

The lever arm will return when driven back by the carb linkage but not on its own

The arm doesn't appear to be catching externally so I'm concerned that there's something wrong inside, how critical I don't know!

I do have a spare pump I picked up a few years ago but not sure it 1) is correct for the bike and 2) works!

I guess my questions are:-

- is an oil pump easy to disassemble, does anyone have photos of a strip down?

- how do I check that my spare oil pump is for a 76 GT750 (any markings)?

- is there any way to check that my spare pump is working?

So close to getting the bike back on the road so any help would be fantastic

Many thanks

Neil
Roger Ackery
Posts: 3693
Joined: Wed Jul 20, 2011 3:40 am
Location: Sydney NSW Australia

Re: GT750A Oil Pump Arm Sticking

Post by Roger Ackery »

Hi, nothing to worry about, they all do this, a little bit on the forum about this if you do a search on the topic ;)
The pump is fine :idea: All the gt750 pumps will work on all models.
Google "pink possum suzuki gt750 oil pumps"
Cheers.
Roger
GT750A.
barney01
Posts: 3118
Joined: Wed Sep 26, 2012 7:33 pm
Location: Prestatyn.Wales

Re: GT750A Oil Pump Arm Sticking

Post by barney01 »

Hi
As Roger says the oil pump arm only returns back down after several revolutions and although very reliable can be damaged by owners trying to force it back.
Here is the link http://www.pinkpossum.com/GT750/Oilpump.htm
NO SMOKE .......NO POKE
GTNelly
Posts: 30
Joined: Sun Oct 14, 2018 9:37 pm

Re: GT750A Oil Pump Arm Sticking

Post by GTNelly »

Guys, this is great news, thanks

The pump has always worked fine and I couldn't understand why there would suddenly be a problem

Means I should be back on the road soon!

Thanks again
GTNelly
Posts: 30
Joined: Sun Oct 14, 2018 9:37 pm

Re: GT750A Oil Pump Arm Sticking

Post by GTNelly »

On the question of my spare oil pump, how do the 750 pumps differ from the 550 or 380?
Roger Ackery
Posts: 3693
Joined: Wed Jul 20, 2011 3:40 am
Location: Sydney NSW Australia

Re: GT750A Oil Pump Arm Sticking

Post by Roger Ackery »

Hi,Pumps are pretty much the same,
GT550 around 83% flow rate of the GT750
http://www.oldjapanesebikes.com
Cheers.
Roger
GT750A.
GTNelly
Posts: 30
Joined: Sun Oct 14, 2018 9:37 pm

Re: GT750A Oil Pump Arm Sticking

Post by GTNelly »

Are there any external identifying marks so I can determine if mines a 750 pump?
barney01
Posts: 3118
Joined: Wed Sep 26, 2012 7:33 pm
Location: Prestatyn.Wales

Re: GT750A Oil Pump Arm Sticking

Post by barney01 »

If you look at the pink possum site I posted earlier you will see a subject headed which pump do I have. There are some numbers on the actuating arm to identify it. :D
NO SMOKE .......NO POKE
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